FIELD OF THE INVENTION
[0001] The present invention relates to compounds that modulate the activity of chemokine
receptors such as CCR2. In some embodiments, the compounds are selective for CCR2.
The compounds can be used, for example, to treat diseases associated with chemokine
receptor expression or activity such as inflammatory diseases, immune diseases and
cancer.
BACKGROUND OF THE INVENTION
[0002] The migration and transport of leukocytes from blood vessels into diseased tissues
is involved in the initiation of normal disease-fighting inflammatory responses. The
process, also known as leukocyte recruitment, is also related to the onset and progression
of inflammatory and autoimmune diseases. The resulting pathology of these diseases
derives from the attack of the body's immune system defenses on apparently normal
tissues. Accordingly, preventing and blocking leukocyte recruitment to target tissues
in inflammatory disease, metabolic disease, autoimmune disease and cancer would be
a highly effective approach to therapeutic intervention.
[0003] The different classes of leukocyte cells that are involved in cellular immune responses
include monocytes, lymphocytes, neutrophils, eosinophils, natural killer cells, mast
cells and basophils. In most cases, monocytes and lymphocytes are the leukocyte classes
that initiate, coordinate, and maintain chronic inflammatory responses, and blockage
of these cells from entering inflammatory sites is desirable. Lymphocytes attract
monocytes to the tissue sites, which, collectively with lymphocytes, are responsible
for most of the actual tissue damage that occurs in inflammatory disease. Infiltration
of the lymphocytes and/or monocytes is known to lead to a wide range of chronic, autoimmune
diseases, and also organ transplant rejection. These diseases include, but are not
limited to, rheumatoid arthritis, chronic contact dermatitis, asthma, hyperallergic
conditions, inflammatory bowel disease, lupus, systemic lupus erythematosus, multiple
sclerosis, atherosclerosis; psoriasis, sarcoidosis, idiopathic pulmonary fibrosis,
dermatomyositis, skin pemphigoid and related diseases, (e.g.,
Pemphigus vulgaris, P. foliacious, P. erythematosis), glomerulonephritides, vasculitides, hepatitis, diabetes, allograft rejection, and
graft-versus-host disease.
[0004] The process by which leukocytes leave the bloodstream, accumulate at inflammatory
sites, and start disease is believed to have at least three steps which have been
described as (1) rolling, (2) activation/firm adhesion and (3) transendothelial migration
[
Springer, T. A., Nature 346:425-433 (1990);
Lawrence and Springer, Cell 65:859-873 (1991);
Butcher, E. C., Cell 67:1033-1036 (1991)]. The second step is mediated at the molecular level by chemoattractant receptors.
Chemoattractant receptors on the surface of leukocytes bind chemoattractant cytokines
which are secreted by cells at the site of apparent damage or infection. Receptor
binding activates leukocytes, increases the adhesiveness of the adhesion molecules
that mediate transendothelial migration, and promotes directed migration of the cells
toward the source of the chemoattractant cytokine.
[0005] Chemotactic cytokines (leukocyte chemoattractant/activating factors) also known as
chemokines, also known as intercrines and SIS cytokines, are a group of inflammatory/
immunomodulatory polypeptide factors of molecular weight 6-15 kDa that are released
by a wide variety of cells such as macrophages, monocytes, eosinophils, neutrophils,
fibroblasts, vascular endotherial cells, epithelial cells, smooth muscle cells, and
mast cells, at inflammatory sites (reviewed in
Luster, New Eng. J Med., 338, 436-445 (1998) and
Rollins, Blood, 90, 909-928 (1997)). Also, chemokines have been described in
Oppenheim, J. J. et al., Annu. Rev. Immunol., 9:617-648 (1991);
Schall and Bacon, Curr. Opin. Immunol., 6:865-873 (1994);
Baggiolini, M., et al., and Adv. Immunol., 55:97-179 (1994). Chemokines have the ability to stimulate directed cell migration, a process known
as chemotaxis. Chemokines can be grouped into two major subfamilies, based on whether
the two amino terminal cysteine residues are immediately adjacent (CC family) or separated
by one amino acid (CXC family). These differences correlate with the organization
of the two subfamilies into separate gene clusters. Within each gene cluster, the
chemokines typically show sequence similarities between 25 to 60%. The CXC chemokines,
such as interleukin-8 (IL-8), neutrophil-activating protein-2 (NAP-2) and melanoma
growth stimulatory activity protein (MGSA) are chemotactic primarily for neutrophils
and T lymphocytes, whereas the CC chemokines, such as RANTES, MIP-1α, MIP-1β, the
monocyte chemotactic proteins (MCP-1, MCP-2, MCP-3, MCP-4, and MCP-5) and the eotaxins
(-1 and -2) are chemotactic for, among other cell types, macrophages, T lymphocytes,
eosinophils, dendritic cells, and basophils. There also exist the chemokines lymphotactin-1,
lymphotactin-2 (both C chemokines), and fractalkine (a CXXXC chemokine) that do not
fall into either of the major chemokine subfamilies.
[0006] MCP-1 (also known as MCAF (abbreviation for macrophage chemotactic and activating
factor) or JE) is a CC chemokine produced by monocytes/macrophages, smooth muscle
cells, fibroblasts, and vascular endothelial cells and causes cell migration and cell
adhesion of monocytes (see for example
Valente, A. J., et al., Biochemistry, 1988, 27, 4162;
Matsushima, K., et al., J. Exp. Med., 1989, 169, 1485;
Yoshimura, T., et al., J. Immunol., 1989, 142, 1956;
Rollins, B. J., et al., Proc. Natl. Acad. Sci. USA, 1988, 85, 3738;
Rollins, B. J., et al., Blood, 1991, 78, 1112;
Jiang, Y., et al., J. Immunol., 1992, 148, 2423;
Vaddi, K., et al., J. Immunol., 1994, 153, 4721), memory T lymphocytes (see for example
Carr, M. W., et al., Proc. Natl. Acad. Sci. USA, 1994, 91, 3652), T lymphocytes (see for example
Loetscher, P., et al., FASEB J., 1994, 8, 1055) and natural killer cells (see for example
Loetscher, P., et al., J. Immunol., 1996, 156, 322;
Allavena, P., et al., Eur. J. Immunol. , 1994, 24, 3233), as well as mediating histamine release by basophils (see for example
Alam, R., et al., J. Clin. Invest., 1992, 89, 723;
Bischoff, S. C., et al., J. Exp. Med., 1992, 175, 1271;
Kuna, P., et al., J. Exp. Med., 1992, 175, 489). In addition, high expression of MCP-1 has been reported in diseases where accumulation
of monocyte/macrophage and/or T cells is thought to be important in the initiation
or progression of diseases, such as atherosclerosis (see for example
Hayes, I. M., et al., Arterioscler. Thromb. Vasc. Biol., 1998, 18, 397;
Takeya, M.. et al., Hum. Pathol., 1993, 24, 534;
Yla-Herttuala, S., et al., Proc. Natl. Acad. Sci. USA, 1991, 88, 5252;
Nelken, N. A., J. Clin. Invest., 1991, 88, 1121), rheumatoid arthritis (see for example
Koch, A. E., et al., J. Clin. Invest., 1992, 90, 772;
Akahoshi, T., et al., Arthritis Rheum., 1993, 36, 762;
Robinson, E., et al., Clin. Exp. Immunol., 101, 398), nephritis (see for example
Noris, M., et al., Lab. Invest., 1995, 73, 804;
Wada, T., at al., Kidney Int., 1996, 49, 761;
Gesualdo, L., et al., Kidney Int., 1997, 51, 155), nephropathy (see for example
Saitoh, A., et al., J. Clin. Lab. Anal., 1998, 12, 1;
Yokoyama, H., et al., J. Leukoc. Biol., 1998, 63, 493), pulmonary fibrosis, pulmonary sarcoidosis (see for example
Sugiyama, Y., et al., Internal Medicine, 1997, 36, 856), asthma (see for example
Karina, M., et al., J. Invest. Allergol. Clin. Immunol., 1997, 7, 254;
Stephene, T. H., Am. J. Respir. Crit. Care Med., 1997, 156, 1377;
Sousa, A. R., et al., Am. J. Respir. Cell Mol. Biol., 1994, 10, 142), multiple sclerosis (see for example
McManus, C., et al., J. Neuroimmunol., 1998, 86, 20), psoriasis (see for example
Gillitzer, R., et al., J. Invest. Dermatol., 1993, 101, 127), inflammatory bowel disease (see for example
Grimm, M. C., et al., J. Leukoc. Biol., 1996, 59, 804;
Reinecker, H. C., et al., Gastroenterology, 1995, 106, 40), myocarditis (see for example
Seino, Y., et al., Cytokine, 1995, 7, 301), endometriosis (see for example
Jolicoeur, C., et al., Am. J. Pathol., 1998, 152, 125), intraperitoneal adhesion (see for example
Zeyneloglu, H. B., et al., Human Reproduction, 1998, 13, 1194), congestive heart failure (see for example
Aurust, P., et al., Circulation, 1998, 97, 1136), chronic liver disease (see for example
Marra, F., et al., Am. J. Pathol., 1998, 152, 423), viral meningitis (see for example
Lahrtz, F., et al., Eur. J. Immunol., 1997, 27, 2484), Kawasaki disease (see for example
Wong, M.; et al., J. Rheumatol., 1997, 24,1179) and sepsis (see for example
Salkowski, C. A.; et al., Infect. Immun., 1998, 66, 3569). Furthermore, anti-MCP-1 antibody has been reported to show an inhibitory effect
or a therapeutic effect in animal models of rheumatoid arthritis (see for example
Schimmer, R. C., et al., J. Immunol., 1998, 160, 1466;
Schrier, D. J., J. Leukoc. Biol., 1998, 63, 359;
Ogata, H., et al., J. Pathol., 1997, 182, 106), multiple sclerosis (see for example
Karpus, W. J., et al., J. Leukoc. Biol., 1997, 62, 681), nephritis (see for example
Lloyd, C. M., et al., J. Exp. Med., 1997, 185, 1371;
Wada, T., et al., FASEB J., 1996, 10, 1418), asthma (see for example
Gonzalo, J.-A., et al., J. Exp. Med., 1998, 188, 157;
Lukacs, N. W., J. Immunol., 1997, 158, 4398), atherosclerosis (see for example
Guzman, L. A., et al., Circulation, 1993, 88 (suppl.), I-371), delayed type hypersensitivity (see for example
Rand, M. L., et al., Am. J. Pathol., 1996, 148, 855), pulmonary hypertension (see for example
Kimura, H., et al., Lab. Invest., 1998, 78, 571), and intraperitoneal adhesion (see for example
Zeyneloglu, H. B., et al., Am. J. Obstet. Gynecol., 1998, 179, 438). A peptide antagonist of MCP-1, MCP-1(9-76), has been also reported to inhibit arthritis
in the mouse model (see
Gong, J.-H., J. Exp. ,4ed. , 1997, 186, 131), as well as studies in MCP-1-deficient mice have shown that MCP-1 is essential for
monocyte recruitment
in vivo (see
Lu, B., et al., J. Exp. Med., 1998, 187, 601;
Gu, L., et al., Moll. Cell, 1998,2,275).
[0007] Chronic obstructive pulmonary disease (COPD) ranks among the most common causes of
death in Western societies. It is defined by a progressive decline in lung function,
only partly reversible by bronchodilator drugs. COPD is characterized by chronic inflammation
in the airways or alveoli that differs from that seen in asthma, involving increased
numbers of neutrophils, macrophages, CD8+ T cells, and/or mast cells in the airway
walls, alveolar compartments, and vascular smooth muscle. Cytokines associated with
COPD are believed to include tumor necrosis factor (TNF)-alpha, interferon (IFN)-gamma,
interleukin (IL)-1 beta, IL-6, IL-8 and MCP-1. CCR2 is known to be a receptor for
MCP-1, and recent data support a role for MCP-1 and CCR2 in airway remodeling and
inflammation directly or via macrophages. Thus, antagonists of CCR2 are an attractive
approach to therapeutic treatment of COPD (
De Boer, W. I., Chest, 2002, 121, 2095-2185).
[0008] The literature indicates that chemokines such as MCP-1 and MIP-1α attract monocytes
and lymphocytes to disease sites and mediate their activation and thus are thought
to be intimately involved in the initiation, progression and maintenance of diseases
deeply involving monocytes and lymphocytes, such as atherosclerosis, diabetes, restenosis,
rheumatoid arthritis, psoriasis, asthma, ulcerative colitis, nephritis (nephropathy),
multiple sclerosis, pulmonary fibrosis, myocarditis, hepatitis, pancreatitis, sarcoidosis,
Crohn's disease, endometriosis, congestive heart failure, viral meningitis, cerebral
infarction, neuropathy, Kawasaki disease, and sepsis (see for example
Rovin, B. H., et al., Am. J. Kidney. Dis., 1998, 31, 1065;
Lloyd, C., et al., Curr. Opin. Nephrol. Hypertens., 1998, 7, 281;
Conti, P., et al., Allergy and Asthma Proc., 1998, 19, 121;
Ransohoff, R. M., et al., Trends Neurosci., 1998, 21, 154;
MacDermott, R. P., et al., Inflammatory Bowel Diseases, 1998, 4, 54).
[0009] The chemokines bind to specific cell-surface receptors belonging to the family of
G-protein-coupled seven-transmembrane-domain proteins (reviewed in
Horuk, Trends Pharm. Sci., 15, 159-165 (1994)) which are termed "chemokine receptors." On binding their cognate ligands, chemokine
receptors transduce an intracellular signal through the associated trimeric G proteins,
resulting in, among other responses, a rapid increase in intracellular calcium concentration,
changes in cell shape, increased expression of cellular adhesion molecules, degranulation,
and promotion of cell migration.
[0010] Genes encoding receptors of specific chemokines have been cloned, and it is known
that these receptors are G protein-coupled seven-transmembrane receptors present on
various leukocyte populations. So far, at least six CXC chemokine receptors (CXCR1-CXCR6)
and nine CC chemokine receptors (CCR1-CCR8 and CCR10) have been identified. For example
IL-8 is a ligand for CXCR1 and CXCR2, MIP-1α is a ligand for CCR1 and CCR5, and MCP-1
is a ligand for CCR2A and CCR2B (for reference, see for example,
Holmes, W. E., et al., Science 1991, 253, 1278-1280;
Murphy P. M., et al., Science, 253, 1280-1283;
Neote, K. et al, Cell, 1993, 72, 415-425;
Charo, I. F., et al., Proc. Natl. Acad. Sci. USA, 1994, 91, 2752-2756;
Yamagami, S., et al., Biochem. Biophys. Res. Commun., 1994, 202, 1156-1162;
Combadier, C., et al., The Journal of Biological Chemistry, 1995, 270, 16491-16494,
Power, C. A., et al., J. Biol. Chem., 1995, 270, 19495-19500;
Samson, M., et al., Biochemistry, 1996, 35, 3362-3367;
Murphy, P. M., Annual Review of Immunology, 1994, 12, 592-633). It has been reported that lung inflammation and granuroma formation are suppressed
in CCR1-deficient mice (see
Gao, J.-L., et al., J. Exp. Med., 1997, 185, 1959;
Gerard, C., et al., J. Clin. Invest., 1997, 100, 2022), and that recruitment of macrophages and formation of atherosclerotic lesion decreased
in CCR2-deficient mice (see
Boring, L., et al., Nature, 1998, 394, 894;
Kuziel, W. A., et al., Proc. Natl. Acad. Sci., USA, 1997, 94, 12053;
Kurihara, T., et al., J. Exp. Med., 1997, 186, 1757;
Boring, L., et al., J. Clin. Invest., 1997, 100, 2552).
[0011] Chemokine receptors are also known as coreceptors for viral entry leading to viral
infection such as, for example, HIV infection. Reverse transcription and protein processing
are the classic steps of the viral life cycle which antiretroviral therapeutic agents
are designed to block. Although many new drugs that are believed to block viral entry
hold promise, there is currently no agent to which HIV-1 has not been able to acquire
resistance. Multiple rounds of viral replication are required to generate the genetic
diversity that forms the basis of resistance. Combination therapy in which replication
is maximally suppressed remains a cornerstone of treatment with entry inhibitors,
as with other agents. The targeting of multiple steps within the viral entry process
is believed to have the potential for synergy (
Starr-Spires et al., Clin. Lab. Med., 2002, 22(3), 681.)
[0012] HIV-1 entry into CD4(+) cells requires the sequential interactions of the viral envelope
glycoproteins with CD4 and a coreceptor such as the chemokine receptors CCR5 and CXCR4.
A plausible approach to blocking this process is to use small molecule antagonists
of coreceptor function. The TAK-779 molecule is one such antagonist of CCR5 that acts
to prevent HIV-1 infection. TAK-779 inhibits HIV-1 replication at the membrane fusion
stage by blocking the interaction of the viral surface glycoprotein gp120 with CCR5.
The binding site for TAK-779 on CCR5 is located near the extracellular surface of
the receptor, within a cavity formed between transmembrane helices 1, 2, 3, and 7
(
Dragic et al., Proc. Natl. Acad. Sci. USA, 2000, 97(10), 5639).
[0013] The chemokine receptors CXCR4 and CCR5 are believed to be used as co-receptors by
the T cell-tropic (X4) and macrophage-tropic (R5) HIV-1 strains, respectively, for
entering their host cells. Propagation of R5 strains of HIV-1 on CD4 lymphocytes and
macrophages requires expression of the CCR5 coreceptor on the cell surface. Individuals
lacking CCR5 (CCR5 Delta 32 homozygous genotype) are phenotypically normal and resistant
to infection with HIV-1. Viral entry can be inhibited by the natural ligands for CXCR4
(the CXC chemokine SDF-1) and CCR5 (the CC chemokines RANTES, MIP-1alpha and MIP-1beta).
The first non-peptidic compound that interacts with CCR5, and not with CXCR4, is a
quaternary ammonium derivative, called TAK-779, which also has potent but variable
anti-HIV activity (
De Clercq et al., Antivir. Chem. Chemother. 2001, 12 Suppl. 1, 19.
[0014] SCH-C (SCH 351125) is another small molecule inhibitor of HIV-1 entry via the CCR5
coreceptor. SCH-C, an oxime-piperidine compound, is a specific CCR5 antagonist as
determined in multiple receptor binding and signal transduction assays. This compound
specifically inhibits HIV-1 infection mediated by CCR5 in U-87 astroglioma cells but
has no effect on infection of CXCR4-expressing cells. (
Strizki et al, Proc. Natl. Acad. Sci. USA, 2001, 98(22), 12718 or
Tremblay et al., Antimicrobial Agents and Chemotherapy, 2002, 46(5), 1336).
[0015] AD101, chemically related to SCH-C, also inhibits the entry of human immunodeficiency
virus type 1 (HIV-1) via human CCR5. It has been found that AD101 inhibits HIV-1 entry
via rhesus macaque CCR5 while SCH-C does not. Among the eight residues that differ
between the human and macaque versions of the coreceptor, only one, methionine-198,
accounts for the insensitivity of macaque CCR5 to inhibition by SCH-C. Position 198
is in CCR5 transmembrane (TM) helix 5 and is not located within the previously defined
binding site for AD101 and SCH-C, which involves residues in TM helices 1, 2, 3, and
7. Based on studies of amino acid substitutions in CCR5, it has been suggested that
the region of CCR5 near residue 198 can influence the conformational state of this
receptor. (
Billick et al., 2004, J. Virol., 78(8), 4134).
WO 03/093266 A is directed to tetrahydropyranyl cyclopentyl tetrahydropyridopyridine modulators
of chemokine receptor activity.
WO 2004/041161 A is directed to tetrahydropyranyl cyclopentyl benzylamide modulators of chemokine
receptor activity.
WO 2006/004741 A and
US 2006 020133 A are directed to 3-aminocyclopentanecarboxamides modulators of chemokine receptors.
[0016] The identification of compounds that modulate the activity of chemokine receptors
represents a desirable drug design approach for the needed development of pharmacological
agents for the treatment of diseases associated with chemokine receptor activity.
The compounds of the present invention help fulfill these and other needs.
SUMMARY OF THE INVENTION
[0017] The present invention provides compounds of Formula I:

or pharmaceutically acceptable salts thereof, wherein constituent members are provided
herein.
[0018] The present invention further provides compositions comprising a compound of Formula
I and a pharmaceutically acceptable carrier.
[0019] The present invention further provides methods of modulating activity of a chemokine
receptor
in vitro comprising contacting said chemokine receptor with a compound of Formula I.
[0020] The present invention further provides compounds of Formula I for use in methods
of treating a disease associated with expression or activity of a chemokine receptor
in a patient comprising administering to the patient a therapeutically effective amount
of a compound of Formula I.
[0021] The present invention further provides a compound described herein for use in therapy.
[0022] The present invention further provides a compound described herein for the preparation
of a medicament for use in therapy.
DETAILED DESCRIPTION
Compounds
[0023] The present invention provides,
inter alia, compounds of Formula I:

or pharmaceutically acceptable salt thereof, wherein:
a dashed line indicates an optional bond;
W is:

V is N, NO or CR5;
X is N, NO or CR2;
Y is N, NO or CR3;
Z is N, NO or CR4; wherein no more than one of X, Y and Z is NO;
A is O, S, CRCRD; or NRF;
RA, RA1, RBand RB1 are each, independently, H, OH, halo, C1-6alkyl, C2-6alkenyl, C2-6 alkynyl, C1-6 haloalkyl, C1-6 alkoxy, C1-6 haloalkoxy, heterocyclyl, carbocyclyl, NR10R12, NR10CO2R11; NR10CONR10R12, NR10SO2NR10R12, NR10-SO2-R11, CN, CONR10R12, CO2R10, NO2, SR10, SOR10, SO2R10; or SO2-NR10R12;
RC and RD are each, independently, H, OH, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, C1-6 haloalkoxy, C1-6 thioalkoxy, heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclylalkyl, carbocyclylalkyl,
NR10R12, NR10CO2R11; NR10CONR10R12, NR10SO2NR10R12, NR10-SO2-R11, CN, CONR10R12 CO2R10, NO2, SR10, SOR10, SO2R10; or SO2-NR10R12, wherein said C1-6 alkyl is optionally substituted with 1-5 substituents selected from hydroxyl, OH,
C1-6 alkoxy, and C1-6 haloalkyl and wherein said heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclylalkyl,
and carbocyclylalkyl are each optionally substituted with 1-4 substituents selected
from C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, halo, C1-4 haloalkyl, CN, NO2, OR13, SR13, C(O)R14, C(O)OR13, C(O)NR15R16, NR15R16, NR15CONHR16, NR15C(O)R14, NR15C(O)OR13, S(O)R14, S(O)2R14, S(O)NR15R16 or SO2NR15R16;
RF is H, OH, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, C1-6 haloalkoxy, heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclylalkyl, carbocyclylalkyl,
SOR10, SO2R10; or SO2-NR10R12, wherein said C1-6 alkyl is optionally substituted with 1-5 substituents selected from hydroxyl, OH,
C1-6 alkoxy, and C1-6 haloalkyl and wherein said heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclylalkyl,
and carbocyclylalkyl are optionally substituted with 1-4 substituents selected from
C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, halo, C1-4 haloalkyl, CN, NO2, OR13, SR13, C(O)R14, C(O)OR13, C(O)NR15R16, NR15R16, NR15CONHR16, NR15C(O)R14, NR15C(O)OR13, S(O)R14, S(O)2R14, S(O)NR15R16 or SO2NR15R16;
R1 is C1-6 alkyl, C1-6 haloalkyl, C1-6 hydroxyalkyl, -(C0-6 alkyl)-O-(C1-6 alkyl), -(C0-6 alkyl)-S-(C1-6 alkyl), -(C0-6 alkyl)-(C3-7 cycloalkyl)-(C0-6 alkyl), OH, OR10, SR10, COR11, CO2R10, CONR10R12, carbocyclyl, heterocyclyl, CN, NR10R12, NR10SO2R10, NR10COR10, NR10CO2R10, NR10CONR12, CR10R11CO2R10 or CR10R11OCOR10;
R2, R3, R4, R5 and R6 are each, independently, H, OH, halo, C1-6alkyl, C1-6 haloalkyl, C1-6 alkoxy, C1-6 haloalkoxy, C1-6 thioalkoxy, NR10R12, NR10CO2R11; NR10CONR10R12, NR10SO2NR10R12, NR10-SO2-R11, heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclyloxy, CN, NO2, COR11, CONR10R12, CO2R10, NO2, SR10, SOR10, SO2R10; or SO2-NR10R12;
R7 is H or C1-6 alkyl optionally substituted by 1-3 substituents selected from halo, OH, CO2H, CO2-(C1-6 alkyl), or C1-3 alkoxy;
R8 and R8' are each, independently, H, C1-6 alkyl, C1-6 haloalkyl, halo, C1-3 alkoxy, C1-3 haloalkoxy, C3-6 cycloalkyl, C3-6 cycloalkyloxy, OH, CO2R10, OCOR10; wherein said C1-6 alkyl is optionally substituted with one or more substituents selected from F, C1-3 alkoxy, OH or CO2R10;
or R7 and R8 together form a bridging C2-4 alkylene or -(C0-2 alkyl)-O-(C1-3 alkyl)-group to form a 5-7 membered ring;
or R8 and R8' together with the carbon atom to which they are attached form a 3-7 membered spirocyclyl
group;
R9 and R9' are each, independently, H, C1-6 alkyl, halo, C1-3 alkoxy, C1-3 haloalkoxy, C3-6 cycloalkyl, C3-6 cycloalkyloxy, OH, CO2R10, OCOR10, wherein said C1-6 alkyl is optionally substituted with one or more substituents selected from F, C1-3 alkoxy, OH or CO2R10;
or R9 and R9' together with the carbon atom to which they are attached form a 3-7 membered spirocyclyl
group;
or R8 and R9 together with the C atoms to which they are attached form a fused 3-7 membered cycloalkyl
group or 3-7 membered heterocycloalkyl group;
R10 is H, C1-6 alkyl, benzyl, phenyl, or C3-6 cycloalkyl, wherein said C1-6 alkyl, benzyl, phenyl, or C3-6 cycloalkyl is optionally substituted with 1-3 selected from halo, OH, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy, C1-3 haloalkoxy, CO2H, and CO2-(C1-6 alkyl);
R11 is H, OH, C1-6 alkyl, C1-6 alkoxy, benzyl, phenyl, benzyloxy, phenyloxy, C3-6 cycloalkyl or C3-6 cycloalkyloxy, wherein said C1-6 alkyl, C1-6 alkoxy, benzyl, phenyl, benzyloxy, phenyloxy, C3-6 cycloalkyl or C3-6 cycloalkyloxy, is optionally substituted with 1-3 substituents selected from halo,
OH, C1-3 alkyl, C1-3 alkoxy, CO2H, CO2-(C1-6 alkyl) and CF3;
R12 is H, C1-6 alkyl, benzyl, phenyl, or C3-6 cycloalkyl, wherein said C1-6 alkyl, benzyl, phenyl, or C3-6 cycloalkyl is optionally substituted with 1-3 selected from halo, OH, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy, C1-3 haloalkoxy, CO2H, and CO2-(C1-6 alkyl);
R13 and R14 are each, independently, H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, C2-6 alkynyl, aryl, cycloalkyl, arylalkyl, or cycloalkylalkyl;
R15 and R16 are each, independently H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, C2-6 alkynyl, aryl, cycloalkyl, arylalkyl, or cycloalkylalkyl;
or R15 and R16 together with the N atom to which they are attached form a 4-6 membered heterocyclyl
group;
p is 0 or 1; and
with the proviso that when A is O and one of R8 and R8' is H, the other of R8 and R8' is other than C1-3 alkoxy, C1-3 haloalkoxy, C3-6 cycloalkyloxy or OH.
[0024] The present invention further provides,
inter alia, compounds of Formula II:

or pharmaceutically acceptable salts thereof, wherein:
a dashed line indicates an optional bond;
W is:

X is N, NO or CR2;
Y is N, NO or CR3;
Z is N, NO or CR4; wherein no more than one of X, Y and Z is NO;
A is O, S, CRCRD; or NRF;
RA, RA1, RBand RB1 are each, independently, H, OH, halo, C1-6alkyl, C2-6alkenyl, C2-6 alkynyl, C1-6 haloalkyl, C1-6 alkoxy, C1-6 haloalkoxy, heterocyclyl, carbocyclyl, NR10R12, NR10CO2R11; NR10CONR10R12, NR10SO2NR10R12, NR10-SO2-R11, CN, CONR10R12, CO2R10, NO2, SR10, SOR10, SO2R10; or SO2-NR10R12;
RC and RD are each, independently, H, OH, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, C1-6 haloalkoxy, C1-6 thioalkoxy, heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclylalkyl, carbocyclylalkyl,
NR10R12, NR10CO2R11; NR10CONR10R12, NR10SO2NR10R12, NR10-SO2-R11, CN, CONR10R12, CO2R10, NO2, SR10, SOR10, SO2R10; or SO2-NR10R12, wherein said C1-6alkyl is optionally substituted with 1-5 substituents selected from hydroxyl, OH,
C1-6 alkoxy, and C1-6 haloalkyl and wherein said heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclylalkyl,
and carbocyclylalkyl are each optionally substituted with 1-4 substituents selected
from C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, halo, C1-4 haloalkyl, CN, NO2, OR13, SR13, C(O)R14, C(O)OR13, C(O)NR15R16, NR15R16, NR15CONHR16, NR15C(O)R14, NR15C(O)OR13, S(O)R14, S(O)2R14, S(O)NR15R16 or SO2NR15R16;
RF is H, OH, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, C1-6 haloalkoxy, heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclylalkyl, carbocyclylalkyl,
SOR10, SO2R10; or SO2-NR10R12, wherein said C1-6 alkyl is optionally substituted with 1-5 substituents selected from hydroxyl, OH,
C1-6 alkoxy, and C1-6 haloalkyl and wherein said heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclylalkyl,
and carbocyclylalkyl are optionally substituted with 1-4 substituents selected from
C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, halo, C1-4 haloalkyl, CN, NO2, OR13, SR13, C(O)R14, C(O)OR13, C(O)NR15R16, NR15R16, NR15CONHR16, NR15C(O)R14, NR15C(O)OR13, S(O)R14, S(O)2R14, S(O)NR15R16 or SO2NR15R16;
R1 is C1-6 alkyl, C1-6 haloalkyl, (C0-6 alkyl)-O-(C1-6 alkyl), (C0-6 alkyl)-S-(C1-6 alkyl), (C0-6 alkyl)-(C3-7 cycloalkyl)-(C0-6 alkyl), OH, OR10, SR10, COR11, CO2R10, CONR10R12, carbocyclyl, heterocyclyl, CN, NR10R12, NR10SO2R10, NR10COR10, NR10CO2R10, NR10CONR12, CR10R11CO2R10 or CR10R11OCOR10;
R2, R3, R4, R5 and R6 are each, independently, H, OH, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, C1-6 haloalkoxy, C1-6 thioalkoxy, NR10R12, NR10CO2R10; NR10CONR10R12, NR10SO2NR10R12, NR10-SO2-R11, heterocyclyl, carbocyclyl, carbocyclyloxy, heterocyclyloxy, CN, NO2, COR11, CONR10R12, CO2R10, NO2, SR10, SOR10, SO2R10; or SO2-NR10R12;
R7 is H or C1-6 alkyl optionally substituted by 1-3 substituents selected from halo, OH, CO2H, CO2-(C1-6 alkyl), or C1-3 alkoxy;
R8 and R8' are each, independently, H, C1-6 alkyl, halo, C1-3 alkoxy, C1-3 haloalkoxy, C3-6 cycloalkyl, C3-6 cycloalkyloxy, OH, CO2R10, OCOR10; wherein said C1-6 alkyl is optionally substituted with one or more substituents selected from F, C1-3 alkoxy, OH or CO2R10;
or R7 and R8 together form a bridging C2-4 alkylene or -(C0-2 alkyl)-O-(C1-3 alkyl)-group to form a 5-7 membered ring;
or R8 and R8' together with the carbon atom to which they are attached form a 3-7 membered spirocyclyl
group;
R9 and R9' are each, independently, H, C1-6 alkyl, halo, C1-3 alkoxy, C1-3 haloalkoxy, C3-6 cycloalkyl, C3-6 cycloalkyloxy, OH, CO2R10, OCOR10, wherein said C1-6 alkyl is optionally substituted with one or more substituents selected from F, C1-3 alkoxy, OH or CO2R10;
or R9 and R9' together with the carbon atom to which they are attached form a 3-7 membered spirocyclyl
group;
or R8 and R9 together with the C atoms to which they are attached form a fused 3-7 membered cycloalkyl
group or 3-7 membered heterocycloalkyl group;
R10 is H, C1-6 alkyl, benzyl, phenyl, or C3-6 cycloalkyl, wherein said C1-6 alkyl, benzyl, phenyl, or C3-6 cycloalkyl is optionally substituted with 1-3 selected from halo, OH, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy, C1-3 haloalkoxy, CO2H, and CO2-(C1-6 alkyl);
R11 is H, OH, C1-6 alkyl, C1-6 alkoxy, benzyl, phenyl, benzyloxy, phenyloxy, C3-6 cycloalkyl or C3-6 cycloalkyloxy, wherein said C1-6 alkyl, C1-6 alkoxy, benzyl, phenyl, benzyloxy, phenyloxy, C3-6 cycloalkyl or C3-6 cycloalkyloxy, is optionally substituted with 1-3 substituents selected from halo,
OH, C1-3 alkyl, C1-3 alkoxy, CO2H, CO2-(C1-6 alkyl) and CF3;
R12 is H, C1-6 alkyl, benzyl, phenyl, or C3-6 cycloalkyl, wherein said C1-6 alkyl, benzyl, phenyl, or C3-6 cycloalkyl is optionally substituted with 1-3 selected from halo, OH, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy, C1-3 haloalkoxy, CO2H, and CO2-(C1-6 alkyl);
R13 and R14 are each, independently, H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, C2-6 alkynyl, aryl, cycloalkyl, arylalkyl, or cycloalkylalkyl;
R15 and R16 are each, independently H, C1-6 alkyl, C1-6 haloalkyl, C2-6 alkenyl, C2-6 alkynyl, aryl, cycloalkyl, arylalkyl, or cycloalkylalkyl;
or R15 and R16 together with the N atom to which they are attached form a 4-6 membered heterocyclyl
group;
p is 0 or 1; and
with the proviso that wherein A is O and one of R8 and R8' is H, the other of R8 and R8' is other than C1-3 alkoxy, C1-3 haloalkoxy, C3-6 cycloalkyloxy or OH.
[0025] In some embodiments, W is

[0026] In some embodiments, W is

[0027] In some embodiments, V is CR
5.
[0028] In some embodiments, X is CR
2.
[0029] In some embodiments, Y is CR
3.
[0030] In some embodiments, Z is CR
4.
[0031] In some embodiments, X is N.
[0032] In some embodiments, Z is N.
[0033] In some embodiments, both X and Z are N.
[0034] In some embodiments, X is CR
2; Y is CR
3; and Z is CR
4.
[0035] In some embodiments, V is CR
5, X is CR
2; Y is CR
3; and Z is CR
4.
[0036] In some embodiments, no more than 2 of V, X, Y, and Z are N.
[0037] In some embodiments, at least 2 of V, X, Y, and Z are other than N or NO.
[0038] In some embodiments, none of V, X, Y, and Z are N or NO.
[0039] In some embodiments, 1 of V, X, Y, and Z is N.
[0040] In some embodiments, 2 of V, X, Y, and Z are N.
[0041] In some embodiments, A is O.
[0042] In some embodiments, A is CR
CR
D.
[0043] In some embodiments, A is CR
CR
D, one of R
C and R
D is OH or C
1-6 alkoxy and the other of R
C and R
D is heterocyclyl or carbocyclyl wherein said heterocyclyl or carbocyclyl is optionally
substituted with 1-4 substituents selected from C
1-6 alkyl, C
2-6 alkenyl, C
2-6 alkynyl, halo, C
1-4 haloalkyl, CN, NO
2, OR
13, SR
13, C(O)R
14, C(O)OR
13, C(O)NR
15R
16, NR
15R
16, NR
15CONHR
16, NR
15C(O)R
14, NR
15C(O)OR
13, S(O)R
14, S(O)
2R
14, S(O)NR
15R
16 or SO
2NR
15R
16.
[0044] In some embodiments, R
A, R
A1, R
Band R
B1 are each, independently, H, OH, halo, C
1-6 alkyl, C
2-6 alkenyl, C
2-6 alkynyl, C
1-6 haloalkyl, C
1-6 alkoxy or C
1-6 haloalkoxy.
[0045] In some embodiments, R
A, R
A1, R
Band R
B1 are each, independently, H, OH or C
1-6 alkoxy.
[0046] In some embodiments, R
A, R
A1, R
Band R
B1 are each, independently, H or OH.
[0047] In some embodiments, R
A, R
A1, R
Band R
B1 are each H.
[0048] In some embodiments, R
1 is C
1-6 alkyl, C
1-6 hydroxyalkyl, -(C
0-6 alkyl)-O-(C
1-6 alkyl), or heterocyclyl (e.g., a 3-7 membered heterocycloalkyl group such as tetrahydrofuanyl).
[0049] In some embodiments, R
1 is -(C
0-6 alkyl)-O-(C
1-6 alkyl).
[0050] In some embodiments, R
1 is C
1-6 alkyl.
[0051] In some embodiments, R
1 is prop-2-yl.
[0052] In some embodiments, one of R
5 and R
6 is other than H.
[0053] In some embodiments, one of R
5 and R
6 is C
1-4 haloalkyl.
[0054] In some embodiments, R
6 is C
1-4 haloalkyl.
[0055] In some embodiments, R
6 is CF
3.
[0056] In some embodiments, R
7 is H.
[0057] In some embodiments, one of R
8 and R
8' is H and the other is C
1-6 alkyl, C
1-6 alkyl or halo.
[0058] In some embodiments, one of R
8 and R
8' is H and the other is C
1-6 alkyl.
[0059] In some embodiments, one of R
8and R
8' is H and the other is methyl or ethyl.
[0060] In some embodiments, R
9 and R
9' are both H.
[0061] In some embodiments, p is 0.
[0062] In some embodiments, p is 1.
[0063] In some embodiments, compounds of the invention have Formula Ia:

[0065] In some embodiments, compounds of the invention have Formula Ie or If:

[0066] In some embodiments, compounds of the invention have Formula Ig:

[0067] In some embodiments, compounds of the invention have Formula Ih or Ii:

[0068] At various places in the present specification, substituents of compounds of the
invention are disclosed in groups or in ranges. It is specifically intended that the
invention include each and every individual subcombination of the members of such
groups and ranges. For example, the term "C
1-6 alkyl" is specifically intended to individually disclose methyl, ethyl, C
3 alkyl, C
4 alkyl, C
5 alkyl, and C
6 alkyl.
[0069] For compounds of the invention in which a variable appears more than once, each variable
can be a different moiety selected from the Markush group defining the variable. For
example, where a structure is described having two R groups that are simultaneously
present on the same compound; the two R groups can represent different moieties selected
from the Markush group defined for R.
[0070] It is further appreciated that certain features of the invention, which are, for
clarity, described in the context of separate embodiments, can also be provided in
combination in a single embodiment. Conversely, various features of the invention
which are, for brevity, described in the context of a single embodiment, can also
be provided separately or in any suitable subcombination.
[0071] As used herein, the term "alkyl" is meant to refer to a saturated hydrocarbon group
which is straight-chained or branched. Example alkyl groups include methyl (Me), ethyl
(Et), propyl (
e.g., n-propyl and isopropyl), butyl (
e.g., n-butyl, isobutyl, t-butyl), pentyl (e.g., n-pentyl, isopentyl, neopentyl), and
the like. An alkyl group can contain from 1 to about 20, from 2 to about 20, from
1 to about 10, from 1 to about 8, from 1 to about 6, from 1 to about 4, or from 1
to about 3 carbon atoms.
[0072] As used herein, "alkylene" refers to a divalent alkyl group.
[0073] As used herein, "C
2-4 alkylene" refers to alkylene groups comprised of from 2 to 4 carbon atoms.
[0074] As used herein, "alkenyl" refers to an alkyl group having one or more double carbon-carbon
bonds. Example alkenyl groups include ethenyl, propenyl, cyclohexenyl, and the like.
[0075] As used herein, "alkynyl" refers to an alkyl group having one or more triple carbon-carbon
bonds. Example alkynyl groups include ethynyl, propynyl, and the like.
[0076] As used herein, "haloalkyl" refers to an alkyl group having one or more halogen substituents.
Example haloalkyl groups include CF
3, C
2F
5, CHF
2, CCl
3, CHCl
2, C
2Cl
5, and the like.
[0077] As used herein, "aryl" refers to monocyclic or polycyclic (e.g., having 2, 3 or 4
fused rings) aromatic hydrocarbons such as, for example, phenyl, naphthyl, anthracenyl,
phenanthrenyl, indanyl, indenyl, and the like. In some embodiments, aryl groups have
from 6 to about 20 carbon atoms.
[0078] As used herein, "carbocyclyl" groups are saturated (i.e., containing no double or
triple bonds) or unsaturated (i.e., containing one or more double or triple bonds)
cyclic hydrocarbon moieties. Carbocyclyl groups can be mono- , poly- (e.g., 2, 3 or
4 fused rings) or spirocyclic. Example carbocyclyl groups include cyclopropyl, cyclobutyl,
cyclopentyl, cyclohexyl, cycloheptyl, cyclopentenyl, 1,3-cyclopentadienyl, cyclohexenyl,
norbornyl, norpinyl, norcarnyl, adamantyl, phenyl, and the like. Carbocyclyl groups
can be aromatic (e.g., "aryl") or non-aromatic (e.g., "cycloalkyl"). In some embodiments,
carbocyclyl groups can have from about 3 to about 30 carbon atoms, about 3 to about
20, about 3 to about 10, or about 3 to about 7 ring-forming carbon atoms.
[0079] As used herein, "cycloalkyl" refers to non-aromatic carbocycles including cyclized
alkyl, alkenyl, and alkynyl groups. Cycloalkyl groups can include mono- or polycyclic
(e.g., having 2, 3 or 4 fused rings) ring systems as well as spiro ring systems. Example
cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl,
cyclopentenyl, cyclohexenyl, cyclohexadienyl, cycloheptatrienyl, norbornyl, norpinyl,
norcarnyl, adamantyl, and the like. Also included in the definition of cycloalkyl
are moieties that have one or more aromatic rings fused (i.e., having a bond in common
with) to the cycloalkyl ring, for example, benzo derivatives of pentane, pentene,
hexane, and the like. In some embodiments, cycloalkyl groups can have from about 3
to about 10, about 3 to about 10, or about 3 to about 7 ring-forming carbon atoms.
In some embodiments, the cycloalkyl group can have 0, 1, 2, 3, 4 or 5 double or triple
bonds. In yet further embodiments, one or more ring-formaing carbon atoms of a cycloalkyl
group can be substituted by an oxo or sulfido group.
[0080] As used herein, "heterocyclyl" or "heterocycle" refers to a saturated or unsaturated
cyclic hydrocarbon wherein one or more of the ring-forming carbon atoms of the cyclic
hydrocarbon is replaced by a heteroatom such as O, S, or N. Heterocyclyl groups can
be aromatic (e.g., "heteroaryl") or non-aromatic (e.g., "heterocycloalkyl"). Heterocyclyl
groups can also correspond to hydrogenated and partially hydrogenated heteroaryl groups.
Heterocyclyl groups can include mono- or polycyclic (e.g., having 2, 3 or 4 fused
rings) ring systems. Heterocyclyl groups can be characterized as having 3-14 or 3-7
ring-forming atoms. In some embodiments, heterocyclyl groups can contain, in addition
to at least one heteroatom, from about 1 to about 13, about 2 to about 10, or about
2 to about 7 carbon atoms and can be attached through a carbon atom or heteroatom.
In further embodiments, any ring-forming carbon or heteroatom can be oxidized (e.g.,
have an oxo or sulfido substituent) or a nitrogen atom can be quaternized. Examples
of heterocyclyl groups include morpholino, thiomorpholino, piperazinyl, tetrahydrofuranyl,
tetrahydrothienyl, 2,3-dihydrobenzofuryl, 1,3-benzodioxole, benzo-1,4-dioxane, piperidinyl,
pyrrolidinyl, isoxazolidinyl, isothiazolidinyl, pyrazolidinyl, oxazolidinyl, thiazolidinyl,
imidazolidinyl, and the like, as well as any of the groups listed below for "heteroaryl"
and "heterocycloalkyl." Further example heterocycles include pyrimidinyl, phenanthridinyl,
phenanthrolinyl, phenazinyl, phenothiazinyl, phenoxathiinyl, phenoxazinyl, phthalazinyl,
piperazinyl, piperidinyl, 3,6-dihydropyridyl, 1,2,3,6-tetrahydropyridyl, 1,2,5,6-tetrahydropyridyl,
piperidonyl, 4-piperidonyl, piperonyl, pteridinyl, purinyl, pyranyl, pyrazinyl, pyrazolidinyl,
pyrazolinyl, pyrazolyl, pyridazinyl, pyridooxazole, pyridoimidazole, pyridothiazole,
pyridinyl, pyridyl, pyrimidinyl, pyrrolidinyl, pyrrolinyl, 2H-pyrrolyl, pyrrolyl,
tetrahydrofuranyl, tetrahydroisoquinolinyl, tetrahydroquinolinyl, tetrazolyl, 6H-1,2,5-thia-diazinyl,
1,2,3-thiadiazolyl, 1,2,4-thiadiazolyl, 1,2,5-thiadiazolyl, 1,3,4-thiadiazolyl, thianthrenyl,
thiazolyl, thienyl, thienothiazolyl, thienooxazolyl, thienoimidazolyl, thiophenyl,
triazinyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,2,5-triazolyl, 1,3,4-triazolyl, xanthenyl,
octahydro-isoquinolinyl, oxadiazolyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl,
1,3,4-oxadiazolyl, oxazolidinyl, oxazolyl, oxazolidinyl, quinazolinyl, quinolinyl,
4H-quinolizinyl, quinoxalinyl, quinuclidinyl, acridinyl, azocinyl, benzimidazolyl,
benzofuranyl, benzothiofuranyl, benzo-thiophenyl, benzoxazolyl, benzthiazolyl, benztriazolyl,
benztetrazolyl, benzisoxazolyl, benzisothiazolyl, benzimidazolinyl, methylenedioxyphenyl,
morpholinyl, naphthyridinyl, deca-hydroquinolinyl, 2H,6H-1,5,2dithiazinyl, dihydrofuro[2,3-b]tetrahydrofuran,
furanyl, furazanyl, carbazolyl, 4aH-carbazolyl, carbolinyl, chromanyl, chromenyl,
cinnolinyl, imidazolidinyl, imidazolinyl, imidazolyl, 1H-indazolyl, indolenyl, indolinyl,
indolizinyl, indolyl, 3H-indolyl, isobenzofuranyl, isochromanyl, isoindazolyl, isoindolinyl,
isoindolyl, isoquinolinyl, isothiazolyl and isoxazolyl. Further examples of heterocycles
include azetidin-1-yl, 2,5-dihydro-1H-pyrrol-1-yl, piperindin-lyl, piperazin-1-yl,
pyrrolidin-1-yl, isoquinol-2-yl, pyridin-1-yl, 3,6-dihydropyridin-1-yl, 2,3-dihydroindol-1-yl,
1,3,4,9-tetrahydrocarbolin-2-yl, thieno[2,3-c]pyridin-6-yl, 3,4,10,10a-tetrahydro-1H-pyrazino[1,2-a]indol-2-yl,
1,2,4,4a,5,6-hexahydro-pyrazino[1,2-a]quinolin-3-yl, pyrazino[1,2-a]quinolin-3-yl,
diazepan-1-yl, 1,4,5,6-tetrahydro-2H-benzo[f]isoquinolin-3-yl, 1,4,4a,5,6,10b-hexahydro-2H-benzo[f]isoquinolin-3-yl,
3,3a,8,8a-tetrahydro-1H-2-aza-cyclopenta[a]inden-2-yl, and 2,3,4,7-tetrahydro-1H-azepin-1-yl,
azepan-1-yl.
[0081] As used herein, "heteroaryl" groups refer to an aromatic heterocycle having at least
one heteroatom ring member such as sulfur, oxygen, or nitrogen. Heteroaryl groups
include monocyclic and polycyclic (e.g., having 2, 3 or 4 fused rings) systems. Examples
of heteroaryl groups include without limitation, pyridyl, pyrimidinyl, pyrazinyl,
pyridazinyl, triazinyl, furyl (furanyl), quinolyl, isoquinolyl, thienyl, imidazolyl,
thiazolyl, indolyl, pyrryl, oxazolyl, benzofuryl, benzothienyl, benzthiazolyl, isoxazolyl,
pyrazolyl, triazolyl, tetrazolyl, indazolyl, 1,2,4-thiadiazolyl, isothiazolyl, benzothienyl,
purinyl, carbazolyl, benzimidazolyl, indolinyl, and the like. In some embodiments,
the heteroaryl group has from 1 to about 20 carbon atoms, and in further embodiments
from about 3 to about 20 carbon atoms. In some embodiments, the heteroaryl group contains
3 to about 14, 3 to about 7, or 5 to 6 ring-forming atoms. In some embodiments, the
heteroaryl group has 1 to about 4, 1 to about 3, or 1 to 2 heteroatoms.
[0082] As used herein, "heterocycloalkyl" refers to non-aromatic heterocycles including
cyclized alkyl, alkenyl, and alkynyl groups where one or more of the ring-forming
carbon atoms is replaced by a heteroatom such as an O, N, or S atom. Example "heterocycloalkyl"
groups include morpholino, thiomorpholino, piperazinyl, tetrahydrofuranyl, tetrahydrothienyl,
2,3-dihydrobenzofuryl, 1,3-benzodioxole, benzo-1,4-dioxane, piperidinyl, pyrrolidinyl,
isoxazolidinyl, isothiazolidinyl, pyrazolidinyl, oxazolidinyl, thiazolidinyl, imidazolidinyl,
and the like. Also included in the definition of heterocycloalkyl are moieties that
have one or more aromatic rings fused (i.e., having a bond in common with) to the
nonaromatic heterocyclic ring, for example phthalimidyl, naphthalimidyl, and benzo
derivatives of heterocycles such as indolene and isoindolene groups. In some embodiments,
the heterocycloalkyl group has from 1 to about 20 carbon atoms, and in further embodiments
from about 3 to about 20 carbon atoms. In some embodiments, the heterocycloalkyl group
contains 3 to about 14, 3 to about 7, or 5 to 6 ring-forming atoms. In some embodiments,
the heterocycloalkyl group has 1 to about 4, 1 to about 3, or 1 to 2 heteroatoms.
In some embodiments, the heterocycloalkyl group contains 0 to 3 double bonds. In some
embodiments, the heterocycloalkyl group contains 0 to 2 double or triple bonds.
[0083] As used herein, "spirocyclyl" refers to a 3-14 membered cycloalkyl or 3-14 membered
heterocycloalkyl group sharing one atom with a further cycloalkyl or heterocycloalkyl
group to which it is attached.
[0084] As used herein, "halo" or "halogen" includes fluoro, chloro, bromo, and iodo.
[0085] As used herein, "alkoxy" refers to an -O-alkyl group. Example alkoxy groups include
methoxy, ethoxy, propoxy (
e.g., n-propoxy and isopropoxy), t-butoxy, and the like.
[0086] As used herein, "thioalkoxy" refers to an -S-alkyl group.
[0087] As used herein, "haloalkoxy" refers to an -O-haloalkyl group. An example haloalkoxy
group is OCF
3.
[0088] As used herein, "carbocyclyloxy" refers to -O-carbocyclyl.
[0089] As used herein, "cycloalkyloxy" refers to -O-cycloalkyl.
[0090] As used herein, "carbocyclylalkyl" refers to alkyl substituted by carbocyclyl.
[0091] As used herein, "aralkyl" or "arylalkyl" refers to an alkyl group substituted by
an aryl group.
[0092] As used herein, "cycloalkylalkyl" refers to an alkyl group substituted by an cycloalkyl
group.
[0093] As used herein, "heterocyclylalkyl" refers to an alkyl moiety substituted by a heterocarbocyclyl
group. Example heterocyclylalkyl groups include "heteroarylalkyl" (alkyl substituted
by heteroaryl) and "heterocycloalkylalkyl" (alkyl substituted by heterocycloalkyl).
In some embodiments, heterocyclylalkyl groups have from 3 to 24 carbon atoms in addition
to at least one ring-forming heteroatom.
[0094] As used herein "oxo" refers to =O.
[0095] The compounds described herein can be asymmetric (e.g., having one or more stereocenters).
All stereoisomers, such as enantiomers and diastereomers, are intended unless otherwise
indicated. Compounds of the present invention that contain asymmetrically substituted
carbon atoms can be isolated in optically active or racemic forms. Methods on how
to prepare optically active forms from optically active starting materials are known
in the art, such as by resolution of racemic mixtures or by stereoselective synthesis.
Many geometric isomers of olefins, C=N double bonds, and the like can also be present
in the compounds described herein, and all such stable isomers are contemplated in
the present invention. Cis and trans geometric isomers of the compounds of the present
invention are described and may be isolated as a mixture of isomers or as separated
isomeric forms.
[0096] Resolution of racemic mixtures of compounds can be carried out by any of numerous
methods known in the art. An example method includes fractional recrystallizaion using
a "chiral resolving acid" which is an optically active, salt-forming organic acid.
Suitable resolving agents for fractional recrystallization methods are, for example,
optically active acids, such as the D and L forms of tartaric acid, diacetyltartaric
acid, dibenzoyltartaric acid, mandelic acid, malic acid, lactic acid or the various
optically active camphorsulfonic acids such as β-camphorsulfonic acid. Other resolving
agents suitable for fractional crystallization methods include stereoisomerically
pure forms of α-methylbenzylamine (e.g.,
S and
R forms, or diastereomerically pure forms), 2-phenylglycinol, norephedrine, ephedrine,
N-methylephedrine, cyclohexylethylamine, 1,2-diaminocyclohexane, and the like.
[0097] Resolution of racemic mixtures can also be carried out by elution on a column packed
with an optically active resolving agent (e.g., dinitrobenzoylphenylglycine). Suitable
elution solvent composition can be determined by one skilled in the art.
[0098] Compounds of the invention also include tautomeric forms, such as keto-enol tautomers.
[0099] Compounds of the invention can also include all isotopes of atoms occurring in the
intermediates or final compounds. Isotopes include those atoms having the same atomic
number but different mass numbers. For example, isotopes of hydrogen include tritium
and deuterium.
[0100] The phrase "pharmaceutically acceptable" is employed herein to refer to those compounds,
materials, compositions, and/or dosage forms which are, within the scope of sound
medical judgment, suitable for use in contact with the tissues of human beings and
animals without excessive toxicity, irritation, allergic response, or other problem
or complication, commensurate with a reasonable benefit/risk ratio.
[0101] The present invention also includes pharmaceutically acceptable salts of the compounds
described herein. As used herein, "pharmaceutically acceptable salts" refers to derivatives
of the disclosed compounds wherein the parent compound is modified by converting an
existing acid or base moiety to its salt form. Examples of pharmaceutically acceptable
salts include, but are not limited to, mineral or organic acid salts of basic residues
such as amines; alkali or organic salts of acidic residues such as carboxylic acids;
and the like. The pharmaceutically acceptable salts of the present invention include
the conventional non-toxic salts or the quaternary ammonium salts of the parent compound
formed, for example, from non-toxic inorganic or organic acids. The pharmaceutically
acceptable salts of the present invention can be synthesized from the parent compound
which contains a basic or acidic moiety by conventional chemical methods. Generally,
such salts can be prepared by reacting the free acid or base forms of these compounds
with a stoichiometric amount of the appropriate base or acid in water or in an organic
solvent, or in a mixture of the two; generally, nonaqueous media like ether, ethyl
acetate, ethanol, isopropanol, or acetonitrile are preferred. Lists of suitable salts
are found in
Remington's Pharmaceutical Sciences, 17th ed., Mack Publishing Company, Easton, Pa.,
1985, p. 1418 and
Journal of Pharmaceutical Science, 66, 2 (1977).
Synthesis
[0102] Compounds of the invention, including salts, hydrates, and solvates thereof, can
be prepared using known organic synthesis techniques and can be synthesized according
to any of numerous possible synthetic routes.
[0103] The reactions for preparing compounds of the invention can be carried out in suitable
solvents which can be readily selected by one of skill in the art of organic synthesis.
Suitable solvents can be substantially nonreactive with the starting materials (reactants),
the intermediates, or products at the temperatures at which the reactions are carried
out, e.g., temperatures which can range from the solvent's freezing temperature to
the solvent's boiling temperature. A given reaction can be carried out in one solvent
or a mixture of more than one solvent. Depending on the particular reaction step,
suitable solvents for a particular reaction step can be selected.
[0105] Reactions can be monitored according to any suitable method known in the art. For
example, product formation can be monitored by spectroscopic means, such as nuclear
magnetic resonance spectroscopy (e.g.,
1H or
13C) infrared spectroscopy, spectrophotometry (e.g., UV-visible), or mass spectrometry,
or by chromatography such as high performance liquid chromatography (HPLC) or thin
layer chromatography.
[0106] Examplary synthetic routes to compounds of the invention are provided in Schemes
1-13 below, where constituent members of the depicted formulae are defined herein.
[0107] 3-Aminopentanecarboxylic acids of formula 1-5 can be prepared using the protocol
described in Scheme 1. The commercially available carboxylic acid 1-1 can be converted
to an ester such as a methyl ester by treatment with iodomethane/potassium carbonate
in DMF. The resulting ester 1-2 can be subjected to an alkylation with a halide such
as an iodide (R
1I) using a base such as lithium hexamethyldisilazide (LHMDS) to provide the alkylated
product 1-3 as a mixture of cis and trans diastereomers (4:1 ratio). The minor trans
diastereomer can be removed by crystallization following hydrolysis of the ester to
an acid. The resulting enantiopure acid 1-4 can be subjected to a hydrogenation using
a catalyst such as Pd-C to afford the saturated carboxylic acid 1-5.

[0108] Cyclopentanecarboxylic acids of formula 2-5 can be prepared using the procedures
outlined in Scheme 2. The commercially available 3-oxocyclopentanecarboxylic acid
2-1 can be converted to an ester such as methyl ester. The ketone of the resulting
ester 2-2 can be protected by treatment with trimethyl orthoformate in the presence
of an acidic catlyst such as paratoluenesulfonic acid. Alkylation of the resulting
ketal 2-3 with an alkyl iodide (R
1I) can be accomplished using a base such as LHMDS. Hydrolysis of the alkylated ester
2-4 using a base such as LiOH, NaOH or KOH provides the carboxylic acids of formula
2-5.

[0109] Piperazine derivatives can be prepared using the procedures depicted in Scheme 3.
Coupling of a piperazine derivative of formula 3-2 with an iodobenzene derivative
of formula 3-1 using copper(I) iodide and potassium phosphate gives rise to the intermediate
3-3. Removal of the Boc group using an acid such as HCl in dioxane or TFA provides
the piperazine derivatives of formula 3-4.

[0110] Alternatively, piperazine derivatives (formula 4-3) can be prepared by displacement
of a 2-chloropyridine or 2-chloropyrimidine derivative of formula 4-1 with a piperazine
derivative of formula 4-2.

[0111] Alternatively, piperazine derivatives can be prepared using a sequence as illustrated
in Scheme 5. The commercially available 3,5-dibromopyridine 5-1 can be converted to
3-bromo-5-iodopyridine 5-2 by treatment with isopropylmagnesium bromide and iodine.
Coupling of the resulting iodo with a piperazine derivative of formula 3-2 can be
accomplished using copper(I) iodide and potassium phosphate. Following conversion
of the bromo of the resulting intermediate 5-3 to iodo using isopropylmagnesium bromide
and iodine, the iodo can be displaced with trifluoromethyl by treatment with Me
3SiCF
3/CuI/KF/DMF to afford the trifluoromethylpyridine derivative of formula 5-5. Removal
of the Boc using an acid such as HCl in dioxane or TFA yields the piperazine derivatives
of formula 5-6.

[0112] Piperidine or tetrahydropyridine derivatives can be synthesized as shown in Scheme
6. Lithiation of a bromo- or iodobenzene derivative of formula 6-1 with an alkyllithium
such as
n-butyllithium or
tert-butyllithium followed by quenching with a ketone derivative of formula 6-2 provides
the tertiary alcohol of formula 6-3. Following dehydration using a dehydrating agent
such as thionyl chloride/pyridine, the resulting olefin 6-4 can be reduced by hydrogenation
using a catalyst such as Pd on carbon. Treatment of 6-3, 6-4 and 6-5 with an acid
such as HCl in dioxane or TFA provides compounds of formulae 6-6, 6-7 and 6-8.

[0113] Alternatively, piperidine or tetrahydropyridine derivatives can be synthesized as
illustrated in Scheme 7. A commercially available 2-chloropyridine or 2-chloropyrilidine
derivative of formula 4-1 can be converted to 2-bromopyridine derivative of formula
7-1 by treatment with BrSiMe
3. Using similar procedures described in Scheme 6, piperidine and tetrahydropyridine
derivatives of formula 7-5 and 7-6 can be obtained from 7-1.

[0114] Alternatively, piperidine or tetrahydropyridine derivatives can be synthesized as
outlined in Scheme 8. 3-Nitro-5-trifluoromethylpyridin-2-ol can be obtained by nitration
of the commercially available 5-trifluoromethylpyridin-2-ol (8-1). Following conversion
of the hydroxy group in 8-2 to chloro, the resulting chloro compound 8-3 is subjected
to a hydrogenation using a catalyst such as Pd on carbon to give 3-amino-5-trifluoromethylpyridine
8-4. Diazotization of 8-4 using NaNO
2/HBr in the presence of Cu(I)Br provides 3-bromo-5-trifluoromethylpyridine 8-5. Following
the procedures described in Scheme 6, 8-5 can be converted to piperidine or tetrahydropyridine
derivatives of formulae 8-9 and 8-10.

[0115] Tetrahydropyran derivatives can be obtained as detailed in Scheme 9 (where R
8 is alkyl; X is halo). The commercially available tetrahydropyranone 9-1 can be alkylated
with an alkyl halide using a base such as LDA to give tetrahydropyranone of formula
9-2. Ketone 9-2 can be converted to an amine of formula 9-4 by reductive amination
with aminodiphenylmethane using a reducing agent such sodium triacetoxyborohydride
followed by hydrogenation using a catalyst such as palladium hydroxide.

[0116] Cyclohexane derivatives of formula 10-6 can be prepared using a sequence depicted
in Scheme 10. A heterocycle 11-1 (R
D-X; wherein X is H or halo) can be lithiated by treatment with butyllithium and the
resulting anion can be quenched with 1,4-cyclohexanone mono-ethylene ketal to give
the alcohol 10-2. Treatment of 10-2 with aqueous acid such as HCl in water converts
the ketal to a ketone. Alkylation of the resulting ketone 10-3 by treatment with LDA
followed by quenching with an alkyl halide such as R
8I affords the cyclohexanone derivatives of formula 10-4. Substituents on the heterocycle
can be present prior to lithiation or can be introduced by another lithiation before
the conversion of the acetal 10-2 to the ketone 10-3. Conversion of ketones 10-4 to
amines of formula 10-6 can be achieved as described in Scheme 9.

[0117] Final compounds of formula I can be assembled using the method described in Scheme
11. A carboxylic acid of formula 1-5 can be condensed with an amine of formula 11-1
using a standard amide formation agent such as BOP or PyBrop (coupling agent). Following
removal of the Boc using an acid such as HCl or TFA, the resulting amine 11-3 is subjected
to a reductive amination with a ketone of formula 11-4 using a reducing agent such
as sodium triacetoxyborohydride to provide final compounds of formula 11-5.

[0118] Alternatively, compounds of the invention can be assembled according to Scheme 12.
Coupling of a carboxylic acid of formula 2-5 with an amine of formula 11-1 using a
standard amide formatiom method produces the amide of formula 12-1. Following conversion
of the ketal to a ketone using an aqueous acid, reductive amination of the resulting
ketone 12-2 with an amine of formula 12-3 using a reducing agent such as sodium triacertoxyborohydride
provides compounds of formula 12-4.

Methods
[0119] In some embodiments, compounds of the invention can modulate activity of one or more
chemokine receptors. The term "modulate" is meant to refer to an ability to increase
or decrease activity of a receptor. Accordingly, compounds of the invention can be
used in methods of modulating a chemokine receptor by contacting the receptor with
any one or more of the compounds or compositions described herein. In some embodiments,
compounds of the present invention can act as inhibitors of chemokine receptors. In
further embodiments, the compounds of the invention can be used to modulate activity
of a chemokine receptor in an individual in need of modulation of the receptor by
administering a modulating amount of a compound of Formula I.
[0120] Chemokine receptors to which the present compounds bind and/or modulate include any
chemokine receptor. In some embodiments, the chemokine receptor belongs to the CC
family of chemokine receptors including, for example, CCR1, CCR2, CCR3, CCR4, CCR5,
CCR6, CCR7, CCR8 and CCR10. In some embodiments, the chemokine receptor is CCR2.
[0121] The compounds of the invention can be selective. By "selective" is meant that a compound
binds to or inhibits a chemokine receptor with greater affinity or potency, respectively,
compared to at least one other chemokine receptor.
[0122] Compounds of the invention can be selective inhibitors or binders of CCR2, meaning
that the compounds of the invention can bind to or inhibit CCR2 with greater affinity
or potency, respectively, than for another chemokine receptor such as at least one
of CCR1, CCR3, CCR4, CCR5, CCR6, CCR7, CCR8 and CCR10. In some embodiments, the compounds
of the invention have binding or inhibition selectivity for CCR2 over CCR5. In some
embodiments, the compounds of the invention have binding or inhibition selectivity
for CCR2 over CCR1. In some embodiments, the compounds of the invention have binding
or inhibition selectivity for CCR2 over any other CCR. Selectivity can be at least
about 10-fold, at least about 20-fold, at least about 50-fold, at least about 100-fold,
at least about 200-fold, at least about 500-fold or at least about 1000-fold. Binding
affinity and inhibitor potency can be measured according to routine methods in the
art, such as according to the assays provided herein.
[0123] The present invention further provides a compound of the present invention, or a
pharmaceutical composition thereof, for use in methods of treating a chemokine receptor-associated
disease or disorder in an individual (e.g., patient) by administering to the individual
in need of such treatment a therapeutically effective amount or dose of said compound
or said pharmaceutical composition thereof. A chemokine receptor-associated disease
can include any disease, disorder or condition that is directly or indirectly linked
to expression or activity of the chemokine or chemokine receptor. A chemokine or chemokine
receptor-associated disease can also include any disease, disorder or condition that
can be prevented, ameliorated, or cured by modulating chemokine receptor activity.
[0124] Examples of chemokine or chemokine receptor-associated diseases, disorders and conditions
include inflammation and inflammatory diseases, metabolic diseases, immune disorders
and cancer. In some embodiments, the chemokine receptor-associated disease is a viral
infection such as HIV infection. Examples of inflammatory diseases include diseases
having an inflammatory component such as asthma, seasonal and perennial allergic rhinitis,
sinusitis, conjunctivitis, age-related macular degeneration, food allergy, scombroid
poisoning, psoriasis, urticaria, pruritus, eczema, inflammatory bowel disease, thrombotic
disease, otitis media, liver cirrhosis, cardiac disease, Alzheimer's disease, sepsis,
restenosis, atherosclerosis, type II diabetes, metabolic syndrome, multiple sclerosis,
Crohn's disease, ulcerative colitis, hypersensitivity lung diseases, drug-induced
pulmonary fibrosis, chronic obstructive pulmonary disease (COPD), rheumatoid arthritis,
nephritis, ulcerative colitis, atopic dermatitis, stroke, acute nerve injury, sarcoidosis,
hepatitis, endometriosis, neuropathic pain, hypersensitivity pneumonitis, eosinophilic
pneumonias, delayed-type hypersensitivity, interstitial lung disease (ILD) (e.g.,
idiopathic pulmonary fibrosis, or ILD associated with rheumatoid arthritis, systemic
lupus erythematosus, ankylosing spondylitis, systemic sclerosis, Sjogren's syndrome,
polymyositis or dermatomyositis) and the like. Examples of immune disorders include
rheumatoid arthritis, psoriatic arthritis, systemic lupus erythematosus, myastenia
gravis, juvenile onset diabetes; glomerulonephritis, autoimmune throiditis, organ
transplant rejection including allograft rejection and graft-versus-host disease.
Examples of cancers include cancers such as breast cancer, ovarian cancer, multiple
myeloma and the like that are characterized by infiltration of macrophages (e.g.,
tumor associated macrophages, TAMs) into tumors or diseased tissues.
[0125] As used herein, the term "contacting" refers to the bringing together of indicated
moieties in an
in vitro system or an
in vivo system. For example, "contacting" the chemokine receptor with a compound of the invention
includes the administration of a compound of the present invention to an individual
or patient, such as a human, having a chemokine receptor, as well as, for example,
introducing a compound of the invention into a sample containing a cellular or purified
preparation containing the chemokine receptor.
[0126] As used herein, the term "individual" or "patient," used interchangeably, refers
to any animal, including mammals, preferably mice, rats, other rodents, rabbits, dogs,
cats, swine, cattle, sheep, horses, or primates, and most preferably humans.
[0127] As used herein, the phrase "therapeutically effective amount" refers to the amount
of active compound or pharmaceutical agent that elicits a biological or medicinal
response that is considered meaningful in a tissue, system, animal, individual or
human by a researcher, veterinarian, medical doctor or other clinician, which includes
one or more of the following:
- (1) preventing the disease; for example, preventing a disease, condition or disorder
in an individual who may be predisposed to the disease, condition or disorder but
does not yet experience or display the pathology or symptomatology of the disease
(non-limiting examples are preventing hypersensitivity lung diseases, drug-induced
pulmonary fibrosis, chronic obstructive pulmonary disease (COPD), graft-versus-host
disease and/or allograft rejection after transplantation, viral infection, insulin
resistance, atherosclerosis, or preventing allergic reactions such as atopic dermatitis,
delayed type hypersensitivity, or seasonal or perennial allergic rhinitis);
- (2) inhibiting the disease and its progression; for example, inhibiting a disease,
condition or disorder in an individual who is experiencing or displaying the pathology
or symptomatology of the disease, condition or disorder (i.e., arresting further development
of the pathology and/or symptomatology) such as inhibiting the inflammatory or autoimmune
response in hypersensitivity lung diseases, drug-induced pulmonary fibrosis, chronic
obstructive pulmonary disease (COPD), rheumatoid arthritis, lupus or psoriasis, or
inhibiting progression of atherosclerotic plaques, Alzheimer's disease, macular degeneration
or the progression of insulin resistance to a diabetic state, or inhibiting tumor
growth or stabilizing viral load in the case of a viral infection; and
- (3) ameliorating the disease; for example, ameliorating a disease, condition or disorder
in an individual who is experiencing or displaying the pathology or symptomatology
of the disease, condition or disorder (i.e., reversing the pathology and/or symptomatology)
such as decreasing the autoimmune response in hypersensitivity lung diseases, drug-induced
pulmonary fibrosis, chronic obstructive pulmonary disease (COPD), rheumatoid arthritis,
lupus or psoriasis, or shrinking a tumor associated with cancer or lowering viral
load in the case of a viral infection.
[0128] One or more additional pharmaceutical agents such as, for example, anti-viral agents,
antibodies, anti-inflammatory agents, insulin secretagogues and sensitizers, serum
lipid and lipid-carrier modulating agents, and/or immunosuppressants can be used in
combination with the compounds of the present invention for treatment of chemokine
receptor-associated diseases, disorders or conditions. The agents can be combined
with the present compounds in a single or continuous dosage form, or the agents can
be administered simultaneously or sequentially as separate dosage forms.
[0129] Suitable antiviral agents contemplated for use in combination with the compounds
of the present invention can comprise nucleoside and nucleotide reverse transcriptase
inhibitors (NRTIs), non-nucleoside reverse transcriptase inhibitors (NNRTIs), protease
inhibitors, entry inhibitors, fusion inhibitors, maturation inhibitors, and other
antiviral drugs.
[0130] Example suitable NRTIs include zidovudine (AZT); didanosine (ddl); zalcitabine (ddC);
stavudine (d4T); lamivudine (3TC); abacavir (1592U89); adefovir dipivoxil [bis(POM)-PMEA];
lobucavir (BMS-180194); BCH-10652; emitricitabine [(-)-FTC]; beta-L-FD4 (also called
beta-L-D4C and named beta-L-2', 3'-dicleoxy-5-fluoro-cytidene); DAPD, ((-)-beta-D-2,6,-diamino-purine
dioxolane); and lodenosine (FddA).
[0131] Typical suitable NNRTIs include nevirapine (BI-RG-587); delaviradine (BHAP, U-90152);
efavirenz (DMP-266); PNU-142721; AG-1549; MKC-442 (1-(ethoxy-methyl)-5-(1-methylethyl)-6-(phenylmethyl)-(2,4(1H,3H)-pyrimidi
nedione); and (+)-calanolide A (NSC-675451) and B.
[0132] Typical suitable protease inhibitors include saquinavir (Ro 31-8959); ritonavir (ABT-538);
indinavir (MK-639); nelfnavir (AG-1343); amprenavir (141W94); lasinavir (BMS-234475);
DMP-450; BMS-2322623; ABT-378; and AG-1 549.
[0133] Other antiviral agents include hydroxyurea, ribavirin, IL-2, IL-12, pentafuside,
enfuvirtide, C-34, the cyclotriazadisulfonamide CADA, PA-457 and Yissum Project No.11607.
[0134] In some embodiments, anti-inflammatory or analgesic agents contemplated for use in
combination with the compounds of the present invention can comprise, for example,
an opiate agonist, a lipoxygenase inhibitor such as an inhibitor of 5-lipoxygenase,
a cyclooxygenase inhibitor such as a cyclooxygenase-2 inhibitor, an interleukin inhibitor
such as an interleukin-1 inhibitor, a TNF inhibitor such as infliximab, etanercept,
or adalimumab an NNMA antagonist, an inhibitor of nitric oxide or an inhibitor of
the synthesis of nitric oxide, a non-steroidal antiinflammatory agent, or a cytokine-suppressing
antiinflammatory agent, for example, such as acetaminophen, aspirin, codeine, fentanyl,
ibuprofen, indomethacin, ketodolac, morphine, naproxen, phenacetin, piroxicam, a steroidal
analgesic, sufentanyl, sunlindac, tenidap, and the like. Similarly, the instant compounds
can be administered with a pain reliever; a potentiator such as caffeine, an H2-antagonist,
simethicone, aluminum or magnesium hydroxide; a decongestant such as phenylephrine,
phenylpropanolamine, pseudophedrine, oxymetazoline, ephinephrine, naphazoline, xylometazoline,
propylhexedfine, or levo-desoxyephedrine; an antfitussive such as codeine, hydrocodone,
caramiphen, carbetapentane, or dextramethorphan; a diuretic; and a sedating or non-sedating
antihistamine.
[0135] In some embodiments, pharmaceutical agents contemplated for use in combination with
the compounds of the present invention can comprise but are not limited to (a) VLA-4
antagonists such as those described in
US 5,510,332,
WO95/15973,
WO96/01644,
WO96/06108,
WO96/20216,
WO96/229661,
WO96/31206,
WO96/4078,
WO97/030941,
WO97/022897 WO 98/426567 WO98/53814,
WO98/53817,
WO98/538185,
WO98/54207, and
WO98/58902; (b) steroids such as beclornethasone, methylpi-ednisolone, betarnethasone, prednisone,
dexamethasone, and hydrocortisone; (c) immunosuppressants such as cyclosporin , tacrolimus,
raparnycin and other FK506 type immunosuppressants; (d) antihistamines (HI-histamine
antagonists) such as bromopheniramine, chlorpheniramine, dexchlorpheniramine, triprolidine,
clemastine, diphenhydramine, diphenylpyraline, tripelennamine, hydroxyzine, methdilazine,
promethazine, trimeprazine, azatadine, cyproheptadine, antazoline, pheniramine pyrilarnine,
asternizole, terfenadine, loratadine, cetirizine, fexofenadine, desearboethoxyloratadine,
and the like; (e) non-steroidal anti-asthmatics such as terbutaline, metaproterenol,
fenoterol, isoethaiine, albuterol, bitolterol, pirbuterol, theophylline, cromolyn
sodium, atropine, ipratropium bromide, leukotriene antagonists (e.g., zafirlukast,
montelukast, pranlukast, iralukast, pobilukast, SKB-106,203), leukotriene biosynthesis
inhibitors (e.g., zileuton, BAY-1005); (f) nonsteroidal antiinflammatory agents (NSAIDs)
such as propionic acid derivatives (e.g., alminoprofen, benoxaprofen, bucloxic acid,
carprofen, fenbufen, fenoprofen, fluprofen, flurbiprofen, ibuprofen, indoprofen, ketoprofen,
miroprofen, naproxen, oxaprozin, pirprofen, pranoprofen, suprofen, tiaprofenic acid,
and tioxaprofen), acetic acid derivatives (e.g., indomethacin, acernetacin, alclofenac,
clidanac, diclofenac, fenclofenac, fenclozic acid, fentiazac, furofenac, ibufenac,
isoxepac, oxpinac, sulindac, tiopinac, tolmetin, zidometacin, and zomepirac), fenarnic
acid derivatives (flufenarnic acid, meclofenamic acid, mefenamic acid, niflumic acid
and tolfenarnic acid), biphenylearboxylic acid derivatives (diflunisal and flufenisal),
oxicams (isoxicarn, piroxicam, sudoxicam and tenoxican), salicylates (acetyl salicylic
acid, sulfasalazine) and the pyrazolones (apazone, bezpiperylon, feprazone, mofebutazone,
oxyphenbutazone, phenylbutazone); (g) cyclooxygenase-2 (COX-2) inhibitors; (h) inhibitors
of phosphodiesterase type IV (PDE-IV); (i) other antagonists of the chemokine receptors,
especially CXCR-4, CCR1, CCR2, CCR3 and CCR5 ; (j) cholesterol lowering agents such
as HMG-CoA reductase inhibitors (lovastatin, sirrivastatin and pravastatin, fluvastatin,
atorvastatin, and other statins), sequestrants (cholestyramine and colestipol), nicotinic
acid, fenofibric acid derivatives (gemfibrozil, clofibrat, fenofibrate and benzafibrate),
and probucol; (k) anti-inflammatory biologic agents such as anti-TNF therapies, anti-IL-1
receptor, CTLA-4Ig, anti-CD20, and anti-VLA4 antibodies; (l) anti-diabetic agents
such as insulin, sulfonylureas, biguanides (metformin), U.-glucosidase inhibitors
(acarbose) and orlitazones (troglitazone and pioglitazone); (m) preparations of interferon
beta (interferon beta- lo., interferon beta-1 P); (n) other compounds such as aminosalicylic
acids, antimetabolites such as azathioprine and 6-mercaptopurine, and cytotoxic cancer
chemotherapeutic agents. The weight ratio of the compound of the compound of the present
invention to the second active ingredient may be varied and will depend upon the effective
dose of each ingredient.
[0136] For example, a CCR2 antagonist can be used in combination with an anti-inflammatory
pharmaceutical agent in the treatment of inflammation, metabolic disease, autoimmune
disease, cancer or viral infection to improve the treatment response as compared to
the response to the therapeutic agent alone, without exacerbation of its toxic effects.
Additive or synergistic effects are desirable outcomes of combining a CCR2 antagonist
of the present invention with an additional agent.
Pharmaceutical Formulations and Dosage Forms
[0137] When employed as pharmaceuticals, the compounds of Formula I can be administered
in the form of pharmaceutical compositions. These compositions can be prepared in
a manner well known in the pharmaceutical art, and can be administered by a variety
of routes depending upon whether local or systemic treatment is desired and upon the
area to be treated. Administration can be topical (including ophthalmic and to mucous
membranes including intranasal, vaginal and rectal delivery), pulmonary (e.g., by
inhalation or insufflation of powders or aerosols, including by nebulizer; intratracheal,
intranasal, epidermal and transdermal), oral or parenteral. Parenteral administration
includes intravenous, intraarterial, subcutaneous, intraperitoneal intramuscular or
injection or infusion; or intracranial, e.g., intrathecal or intraventricular, administration.
Parenteral administration can be in the form of a single bolus dose, or can be, for
example, by a continuous perfusion pump. Pharmaceutical compositions and formulations
for topical administration can include transdermal patches, ointments, lotions, creams,
gels, drops, suppositories, sprays, liquids and powders. Conventional pharmaceutical
carriers, aqueous, powder or oily bases, thickeners and the like may be necessary
or desirable. Coated condoms, gloves and the like may also be useful.
[0138] This invention also includes pharmaceutical compositions which contain, as the active
ingredient, one or more of the compounds of Formula I above in combination with one
or more pharmaceutically acceptable carriers. In making the compositions of the invention,
the active ingredient is typically mixed with an excipient, diluted by an excipient
or enclosed within such a carrier in the form of, for example, a capsule, sachet,
paper, or other container. When the excipient serves as a diluent, it can be a solid,
semi-solid, or liquid material, which acts as a vehicle, carrier or medium for the
active ingredient. Thus, the compositions can be in the form of tablets, pills, powders,
lozenges, sachets, cachets, elixirs, suspensions, emulsions, solutions, syrups, aerosols
(as a solid or in a liquid medium), ointments containing, for example, up to 10% by
weight of the active compound, soft and hard gelatin capsules, suppositories, sterile
injectable solutions, and sterile packaged powders.
[0139] In preparing a formulation, the active compound can be milled to provide the appropriate
particle size prior to combining with the other ingredients. If the active compound
is substantially insoluble, it can be milled to a particle size of less than 200 mesh.
If the active compound is substantially water soluble, the particle size can be adjusted
by milling to provide a substantially uniform distribution in the formulation, e.g.
about 40 mesh.
[0140] Some examples of suitable excipients include lactose, dextrose, sucrose, sorbitol,
mannitol, starches, gum acacia, calcium phosphate, alginates, tragacanth, gelatin,
calcium silicate, microcrystalline cellulose, polyvinylpyrrolidone, cellulose, water,
syrup, and methyl cellulose. The formulations can additionally include: lubricating
agents such as talc, magnesium stearate, and mineral oil; wetting agents; emulsifying
and suspending agents; preserving agents such as methyl- and propylhydroxy-benzoates;
sweetening agents; and flavoring agents. The compositions of the invention can be
formulated so as to provide quick, sustained or delayed release of the active ingredient
after administration to the patient by employing procedures known in the art.
[0141] The compositions can be formulated in a unit dosage form, each dosage containing
from about 5 to about 1000 mg (1 g), more usually about 100 to about 500 mg, of the
active ingredient. The term "unit dosage forms" refers to physically discrete units
suitable as unitary dosages for human subjects and other mammals, each unit containing
a predetermined quantity of active material calculated to produce the desired therapeutic
effect, in association with a suitable pharmaceutical excipient.
[0142] In some embodiments, the compounds or compositions of the invention contain from
about 5 to about 50 mg of the active ingredient. One having ordinary skill in the
art will appreciate that this embodies compounds or compositions containing from about
5 to about 10, from about 10 to about 15, from about 15 to about 20, from about 20
to about 25, from about 25 to about 30, from about 30 to about 35, from about 35 to
about 40, from about 40 to about 45, or from about 45 to about 50 mg of the active
ingredient.
[0143] In some embodiments, the compounds or compositions of the invention contain from
about 50 to about 500 mg of the active ingredient. One having ordinary skill in the
art will appreciate that this embodies compounds or compositions containing from about
50 to about 75, from about 75 to about 100, from about 100 to about 125, from about
125 to about 150, from about 150 to about 175, from about 175 to about 200, from about
200 to about 225, from about 225 to about 250, from about 250 to about 275, from about
275 to about 300, from about 300 to about 325, from about 325 to about 350, from about
350 to about 375, from about 375 to about 400, from about 400 to about 425, from about
425 to about 450, from about 450 to about 475, or from about 475 to about 500 mg of
the active ingredient.
[0144] In some embodiments, the compounds or compositions of the invention contain from
about 500 to about 1000 mg of the active ingredient. One having ordinary skill in
the art will appreciate that this embodies compounds or compositions containing from
about 500 to about 550, from about 550 to about 600, from about 600 to about 650,
from about 650 to about 700, from about 700 to about 750, from about 750 to about
800, from about 800 to about 850, from about 850 to about 900, from about 900 to about
950, or from about 950 to about 1000 mg of the active ingredient.
[0145] The active compound can be effective over a wide dosage range and is generally administered
in a pharmaceutically effective amount. It will be understood, however, that the amount
of the compound actually administered will usually be determined by a physician, according
to the relevant circumstances, including the condition to be treated, the chosen route
of administration, the actual compound administered, the age, weight, and response
of the individual patient, the severity of the patient's symptoms, and the like.
[0146] For preparing solid compositions such as tablets, the principal active ingredient
is mixed with a pharmaceutical excipient to form a solid preformulation composition
containing a homogeneous mixture of a compound of the present invention. When referring
to these preformulation compositions as homogeneous, the active ingredient is typically
dispersed evenly throughout the composition so that the composition can be readily
subdivided into equally effective unit dosage forms such as tablets, pills and capsules.
This solid preformulation is then subdivided into unit dosage forms of the type described
above containing from, for example, 0.1 to about 1000 mg of the active ingredient
of the present invention.
[0147] The tablets or pills of the present invention can be coated or otherwise compounded
to provide a dosage form affording the advantage of prolonged action. For example,
the tablet or pill can comprise an inner dosage and an outer dosage component, the
latter being in the form of an envelope over the former. The two components can be
separated by an enteric layer which serves to resist disintegration in the stomach
and permit the inner component to pass intact into the duodenum or to be delayed in
release. A variety of materials can be used for such enteric layers or coatings, such
materials including a number of polymeric acids and mixtures of polymeric acids with
such materials as shellac, cetyl alcohol, and cellulose acetate.
[0148] The liquid forms in which the compounds and compositions of the present invention
can be incorporated for administration orally or by injection include aqueous solutions,
suitably flavored syrups, aqueous or oil suspensions, and flavored emulsions with
edible oils such as cottonseed oil, sesame oil, coconut oil, or peanut oil, as well
as elixirs and similar pharmaceutical vehicles.
[0149] Compositions for inhalation or insufflation include solutions and suspensions in
pharmaceutically acceptable, aqueous or organic solvents, or mixtures thereof, and
powders. The liquid or solid compositions may contain suitable pharmaceutically acceptable
excipients as described supra. In some embodiments, the compositions are administered
by the oral or nasal respiratory route for local or systemic effect. Compositions
in can be nebulized by use of inert gases. Nebulized solutions may be breathed directly
from the nebulizing device or the nebulizing device can be attached to a face masks
tent, or intermittent positive pressure breathing machine. Solution, suspension, or
powder compositions can be administered orally or nasally from devices which deliver
the formulation in an appropriate manner.
[0150] The amount of compound or composition administered to a patient will vary depending
upon what is being administered, the purpose of the administration, such as prophylaxis
or therapy, the state of the patient, the manner of administration, and the like.
In therapeutic applications, compositions can be administered to a patient already
suffering from a disease in an amount sufficient to cure or at least partially arrest
the symptoms of the disease and its complications. Effective doses will depend on
the disease condition being treated as well as by the judgment of the attending clinician
depending upon factors such as the severity of the disease, the age, weight and general
condition of the patient, and the like.
[0151] The compositions administered to a patient can be in the form of pharmaceutical compositions
described above. These compositions can be sterilized by conventional sterilization
techniques, or may be sterile filtered. Aqueous solutions can be packaged for use
as is, or lyophilized, the lyophilized preparation being combined with a sterile aqueous
carrier prior to administration. The pH, of the compound preparations typically will
be between 3 and 11, more preferably from 5 to 9 and most preferably from 7 to 8.
It will be understood that use of certain of the foregoing excipients, carriers, or
stabilizers will result in the formation of pharmaceutical salts.
[0152] The therapeutic dosage of the compounds of the present invention can vary according
to, for example, the particular use for which the treatment is made, the manner of
administration of the compound, the health and condition of the patient, and the judgment
of the prescribing physician. The proportion or concentration of a compound of the
invention in a pharmaceutical composition can vary depending upon a number of factors
including dosage, chemical characteristics (e.g., hydrophobicity), and the route of
administration. For example, the compounds of the invention can be provided in an
aqueous physiological buffer solution containing about 0.1 to about 10% w/v of the
compound for parenteral adminstration. Some typical dose ranges are from about 1 µg/kg
to about 1 g/kg of body weight per day. In some embodiments, the dose range is from
about 0.01 mg/kg to about 100 mg/kg of body weight per day. The dosage is likely to
depend on such variables as the type and extent of progression of the disease or disorder,
the overall health status of the particular patient, the relative biological efficacy
of the compound selected, formulation of the excipient, and its route of administration.
Effective doses can be extrapolated from dose-response curves derived from
in vitro or animal model test systems.
[0153] The compounds of the invention can also be formulated in combination with one or
more additional active ingredients which can include any pharmaceutical agent such
as antibodies, immune suppressants, anti-inflammatory agents, chemotherapeutics, lipid
lowering agents, HDL elevating agents, insulin secretagogues or sensitizers, drugs
used for the treatment of rheumatoid arthritis and the like.
Rheumatoid Arthritis (RA) Treatment Regimen
[0154] Rheumatoid arthritis (RA) patients, treated aggressively with disease modifying agents
(methotrexate, antimalarials, gold, penicillamine, sulfasalazine, dapsone, leflunamide,
or biologicals), can achieve varying degrees of disease control, including complete
remissions. These clinical responses are associated with improvement in standardized
scores of disease activity, specifically the ACR criteria which includes: pain, function,
number of tender joints, number of swollen joints, patient global assessment, physician
global assessment, laboratory measures of inflammation (CRP and ESR), and radiologic
assessment of joint structural damage. Current disease-modifying drugs (DMARDs) require
continued administration to maintain optimal benefit. Chronic dosing of these agents
is associated with significant toxicity and host defense compromise. Additionally,
patients often become refractory to a particular therapy and require an alternative
regimen. For these reasons, a novel, effective therapy which allows withdrawal of
standard DMARDs would be a clinically important advance.
[0155] Patients with significant response to anti-TNF therapies (infliximab, etanercept,
adalimumab), anti- IL-1 therapy (kinaret) or other disease modifying anti-rheumatic
drugs (DMARDs) including but not limited to methotrexate, cyclosporine, gold salts,
antimalarials, penicillamine or leflunamide, who have achieved clinical remission
of disease can be treated with a substance that inhibits expression and/or activity
of CCR2 including, for example, nucleic acids (e.g., antisense or siRNA molecules),
proteins (e.g., anti-CCR2 antibodies), small molecule inhibitors (e.g., the compounds
disclosed herein and other chemokine receptor inhibitors known in the art).
[0156] In some embodiments, the substance that inhibits expression and/or activity of CCR2
is a small molecule CCR2 inhibitor (or antagonist). The CCR2 antagonist can be dosed
orally q.d. or b.i.d at a dose not to exceed about 500 mgs a day. The patients can
be withdrawn from or have a decrease in the dosage of their current therapy and would
be maintained on treatment with the CCR2 antagonist. Treating patients with a combination
of CCR2 antagonist and their current therapy can be carried out for, for example,
about one to about two days, before discontinuing or dose reducing the DMARD and continuing
on CCR2 antagonist.
[0157] Advantages of substituting traditional DMARDS with CCR2 antagonists are numerous.
Traditional DMARDs have serious cumulative dose-limiting side effects, the most common
being damage to the liver, as well as immunosuppressive actions. CCR2 antagonism is
expected to have an improved long-term safety profile and will not have similar immunosuppressive
liabilities associated with traditional DMARDs. Additionally, the half-life of the
biologicals is typically days or weeks, which is an issue when dealing with adverse
reactions. The half-life of an orally bioavailable CCR2 antagonist is expected to
be on the order of hours so the risk of continued exposure to the drug after an adverse
event is very minimal as compared to biological agents. Also, the current biologic
agents (infliximab, etanercept, adalimumab, kinaret) are typically given either i.v.
or s.c., requiring doctor's administration or patient self-injection. This leads to
the possibility of infusion reaction or injection site reactions. These are avoidable
using an orally administered CCR2 antagonist.
Diabetes and Insulin Resistance Treatment Regimen
[0158] Type 2 diabetes is one of the leading causes of morbidity and mortality in western
societies. In the vast majority of patients, the disease is characterized by pancreatic
beta-cell dysfunction accompanied by insulin resistance in the liver and in peripheral
tissues. Based on the primary mechanisms that are associated with disease, two general
classes of oral therapies are available to treat type 2 diabetes: insulin secretagogues
(sulfonylureas such as glyburide) and insulin sensitizers (metformin and thiazolidinediones
such as rosiglitazone). Combination therapy that addresses both mechanisms has been
shown to manage the metabolic defects of this disease and in many instances can be
shown to ameliorate the need for exogenous insulin administration. However, with time,
insulin resistance often progresses, leading to the need for further insulin supplementation.
In addition, a prediabetic state, referred to as the metabolic syndrome, has been
demonstrated to be characterized by impaired glucose tolerance, particularly in association
with obesity. The majority of patients who develop type 2 diabetes begin by developing
insulin resistance, with the hyperglycemia occurring when these patients can no longer
sustain the degree of hyperinsulinemia necessary to prevent loss of glucose homeostasis.
The onset of the insulin resistance component is highly predictive of disease onset
and is associated with an increase in the risk of developing type 2 diabetes, hypertension
and coronary heart disease.
[0159] One of the strongest correlates of impaired glucose tolerance and of the progression
from an insulin resistant state to type 2 diabetes is the presence of central obesity.
Most patients with type 2 diabetes are obese and obesity itself is associated with
insulin resistance. It is clear that central adiposity is a major risk factor for
the development of insulin resistance leading to type 2 diabetes, suggesting that
signals from visceral fat contribute to the development of insulin resistant and progression
to disease. In addition to the secreted protein factors, obesity induces a cellular
inflammatory response in which bone-marrow derived macrophages accumulate in adipose
depots, becoming adipose tissue macrophages. Adipose tissue macrophages accumulate
in adipose tissue in proportion to measures of adiposity. Tissue infiltrating macrophages
are a source of many of the inflammatory cytokines that have been demonstrated to
induce insulin resistance in adipocytes.
[0160] Adipose tissue produces MCP-1 in proportion to adiposity, suggesting that its activity
by signaling through CCR2 also might play an important role in the accumulation of
macrophages in adipose tissue. It is unknown whether the MCP-1/CCR2 interaction is
directly responsible for monocyte recruitment to adipose tissue, whether reduced recruitment
of macrophages to adipose tissue in humans will directly lead to the reduced production
of proinflammatory molecules and whether the proinflammatory molecule production is
directly linked to insulin resistance.
[0161] Patients who demonstrate insulin resistance, either prediabetic (normoglycemic) or
diabetic (hyperglycemic), could be treated with a substance that inhibits the expression
and/or activity of CCR2 including, for example, nucleic acids (e.g., antisense or
siRNA molecules), proteins (e.g., anti-CCR2 antibodies), small molecule inhibitors
(e.g., the compounds disclosed herein and other chemokine receptor inhibitors known
in the art). In some embodiments, the substance that inhibits expression and/or activity
of CCR2 is a small molecule CCR2 inhibitor (or antagonist). The CCR2 antagonist can
be dosed orally q.d. or b.i.d at a dose not to exceed about 500 mgs a day. The patients
can be withdrawn from or have a decrease in the dosage of their current therapy and
would be maintained on treatment with the CCR2 antagonist. Alternately CCR2 antagonist
treatment may be used to supplement their current therapy to enhance its effectiveness
or to prevent progression to further insulin dependence.
[0162] Advantages of substituting or supplementing traditional agents with CCR2 antagonists
are numerous. Such agents may be useful, for example, to preclude progression from
a prediabetic, insulin resistant state to a diabetic state. Such agents may reduce
or replace the need for the use of insulin sensitizers, with their attendant toxicities.
Such agents may also reduce the need for, or prolong the period until, exogenous insulin
supplementation is required.
Atherosclerosis Treatment Regimen
[0163] Atherosclerosis is a condition characterized by the deposition of fatty substances
in arterial walls. Plaque encompasses such deposits of fatty substances, cholesterol,
cellular waste products, calcium and other substances that build up in the inner lining
of an artery. Plaques can grow large enough to significantly reduce the blood's flow
through an artery. However, more significant damage occurs when the plaque becomes
unstable and ruptures. Plaques that rupture cause blood clots to form that can block
blood flow or break off and travel to other parts of the body. If the clot blocks
a blood vessel that feeds the heart, it causes a heart attack. If it blocks a blood
vessel that feeds the brain, it causes a stroke. Atherosclerosis is a slow, complex
disease that typically starts in childhood and often progresses as people grow older.
[0164] A high level of cholesterol in the blood is a major risk factor for coronary heart
disease. Based on cholesterol as a primary composition of plaque, the advance of plaque
formation has been managed by the reduction of circulating cholesterol or by elevation
of cholesterol-carrying high density lipoproteins (HDL). Circulating cholesterol can
be reduced, for example, by inhibiting its synthesis in the liver using or by reducing
update from food. Such medicaments that act through these mechanism may include medicines
that are used to lower high cholesterol levels: bile acid absorbers, lipoprotein synthesis
inhibitors, cholesterol synthesis inhibitors and fibric acid derivatives. Circulating
HDL can additionally be elevated by administration of, for example, probuchol or high
doses of niacin. Therapy that addresses multiple mechanisms has been shown to slow
disease progression and progression to plaque rupture.
[0165] Atherosclerosis is typically accompanied by a cellular inflammatory response in which
bone-marrow derived macrophages accumulate in fatty streaks along the vessel wall,
becoming foam cells. Foam cells are a source of many of the inflammatory cytokines
that have been demonstrated to induce plaque progression and of the enzymes that can
promote plaque destabilization. Atherosclerotic tissue also produces MCP-1, suggesting
that its activity by signaling through CCR2 also might play an important role in the
accumulation of macrophages as foam cells in plaques. CCR2-/- mice have been demonstrated
to have significantly reduced macrophages in fatty streaks generated as a result of
high fat diet or genetic alteration in lipid metabolism.
[0166] Patients who demonstrate high circulating cholesterol, low HDL, or elevated circulating
CRP or present with vessel wall plaque by imaging, or any other evidence of the presence
of atherosclerosis could be treated with a substance that inhibits the expression
and/or activity of CCR2 including, for example, nucleic acids (e.g., antisense or
siRNA molecules), proteins (e.g., anti-CCR2 antibodies), small molecule inhibitors
(e.g., the compounds disclosed herein and other chemokine receptor inhibitors known
in the art). In some embodiments, the substance that inhibits expression and/or activity
of CCR2 is a small molecule CCR2 inhibitor (or antagonist) such as a compound of the
invention. The CCR2 antagonist can be dosed orally q.d. or b.i.d at a dose not to
exceed about 500 mgs a day. The patients can be withdrawn from or have a decrease
in the dosage of their current therapy and would be maintained on treatment with the
CCR2 antagonist. Alternately CCR2 antagonist treatment may be used to supplement their
current therapy to enhance its effectiveness in, for example, preventing plaque progression,
stabilizing plaque that has already formed or inducing plaque regression.
Advantages of substituting or supplementing traditional agents with CCR2 antagonists
are numerous. Such agents may be useful, for example, to preclude progression of the
plaque to a stage of instability with its associated risk of plaque rupture. Such
agents may reduce or replace the need for the use of cholesterol modifying drugs or
HDL elevating drugs, with their attendant toxicities including, but not limited to,
flushing, liver damage and muscle damage such as myopathy. Such agents may also reduce
the need for, or prolong the period until, surgery is required to open the vessel
wall or until use of anticoagulants is required to limit damage due to potential plaque
rupture.
Labeled Compounds and Assay Methods
[0167] Another aspect of the present invention relates to fluorescent dye, spin lable, heavy
metal or radio-labeled compounds of Formula I that would be useful not only in imaging
but also in assays, both
in vitro and
in vivo, for localizing and quantitating the chemokine receptor in tissue samples, including
human, and for identifying chemokine receptor ligands by inhibition binding of a labeled
compound. Accordingly, the present invention includes chemokine receptor assays that
contain such labeled compounds.
[0168] The present invention further includes isotopically-labeled compounds of Formula
I. An "isotopically" or "radio-labeled" compound is a compound of the invention where
one or more atoms are replaced or substituted by an atom having an atomic mass or
mass number different from the atomic mass or mass number typically found in nature
(i.e., naturally occurring). Suitable radionuclides that may be incorporated in compounds
of the present invention include but are not limited to
2H (also written as D for deuterium),
3H (also written as T for tritium),
11C,
13C,
14C,
13N,
15N,
15O,
17O,
18O,
18F,
35S,
36Cl,
82Br,
75Br,
76Br,
77Br,
123I,
124I,
125I and
131I. The radionuclide that is incorporated in the instant radio-labeled compounds will
depend on the specific application of that radio-labeled compound. For example, for
in vitro chemokine receptor labeling and competition assays, compounds that incorporate
3H,
14C,
82Br,
125I,
131I,
35S or will generally be most useful. For radio-imaging applications
11C,
18F,
125I,
123I,
124I,
131I,
75Br,
76Br or
77Br will generally be most useful.
[0169] It is understood that a "radio-labeled " or "labeled compound" is a compound that
has incorporated at least one radionuclide. In some embodiments the radionuclide is
selected from the group consisting of
3H,
14C,
125I,
35S and
82Br.
[0170] Synthetic methods for incorporating radio-isotopes into organic compounds are applicable
to compounds of the invention and are well known in the art.
[0171] A radio-labeled compound of the invention can be used in a screening assay to identify/evaluate
compounds. In general terms, a newly synthesized or identified compound (i.e., test
compound) can be evaluated for its ability to reduce binding of the radio-labeled
compound of the invention to the chemokine receptor. Accordingly, the ability of a
test compound to compete with the radio-labeled compound for binding to the chemokine
receptor directly correlates to its binding affinity.
Kits
[0172] The present invention also includes pharmaceutical kits useful, for example, in the
treatment or prevention of chemokine-associated diseases which include one or more
containers containing a pharmaceutical composition comprising a therapeutically effective
amount of a compound of Formula I. Such kits can further include, if desired, one
or more of various conventional pharmaceutical kit components, such as, for example,
containers with one or more pharmaceutically acceptable carriers, additional containers,
etc., as will be readily apparent to those skilled in the art. Instructions, either
as inserts or as labels, indicating quantities of the components to be administered,
guidelines for administration, and/or guidelines for mixing the components, can also
be included in the kit.
[0173] The invention will be described in greater detail by way of specific examples. The
following examples are offered for illustrative purposes, and are not intended to
limit the invention in any manner. Those of skill in the art will readily recognize
a variety of noncritical parameters which can be changed or modified to yield essentially
the same results.
EXAMPLES
Example 1
[0174]

Preparation of N-[(1R,3S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
Step A-1
[0175]

Methyl (1R,4S)-4-[(tert-Butoxycarbonyl)amino]cyclopent-2-ene-1-carboxylate
[0176] To a solution of (1
R,4
S)-4-[(
tert-butoxycarbonyl)amino]cyclopent-2-ene-1-carboxylic acid (10.0 g, 44 mmol) in DMF (25
mL) was added potassium carbonate (6.33 g, 45.8 mmol) followed by methyl iodide (4.0
mL, 64 mmol). After being stirred at room temperature overnight, the reaction mixture
was diluted with EtOAc. The solution was washed with water four times and brine one
time, dried (MgSO
4) and concentrated. The residue was dried under high vacuum overnight to provide the
title compound (11 g, 99%). MS calculated for C
12H
19NO
4: (M+H)
+ 242; found 142.1 (M-Boc+H)
+.
1H NMR (CDCl
3) δ 5.86 (m, 2H), 4.90 (m, 1H), 4.80 (m, 1H), 3.72 (s, 3H), 3.50 (m, 1H), 2.51 (m,
1H), 1.86 (m, 1H), 1.42 (s, 9H).
Step A-2
[0177]

Methyl (1S,4S)-4-[(tert-Butoxycarbonyl)amino]-1-isopropylcyclopent-2-ene-1-carboxylate
[0178] To a 1.00 M solution of lithium hexamethyldisilazide in THF (202 mL) at -78 °C was
added a solution of methyl (1
R,4
S)-4-[(
tert-butoxycarbonyl)amino]cyclopent-2-ene-1-carboxylate (22.10 g, 91.59 mmol) in THF (36.2
mL) over 10 min. The solution was stirred at -78 °C for 30 min before isopropyl iodide
(10.0 mL, 100 mmol) was added in one portion. The mixture was then moved to a freezer
reading at -24 °C and kept overnight. The reaction was quenched with aqueous ammonium
chloride and the resulting solution was extracted with ether three times. The ether
layers were dried over sodium sulfate and evaporated
in vacuo. The residue was purified by flash chromatography on silica eluting with 10% ethyl
acetate/hexane to give the title compound (20.2 g). MS calculated for C
15H
25NO
4: (M+H)
+ 284; found 184.2 (M-Boc+H)
+.
Step A-3
[0179]

(1S,4S)-4-[(tert-Butoxycarbonyl)amino]-1-isopropylcyclopent-2-ene-1-carboxylic Acid
[0180] To a solution of methyl (1
S,4
S)-4-[(
tert-butoxycarbonyl)amino]-1-isopropylcyclopent-2-ene-1-carboxylate (18.42 g, 65 mmol)
in THF (500 mL), methanol (500 mL) and water (100 mL) was added lithium hydroxide
monohydrate (5.00 g, 119 mmol). The mixture was heated to reflux overnight. After
18 hours, TLC indicated a very trace amount of starting material. The organic solvents
were removed
in vacuo and the aqueous layer was extracted with ether (200mL) to remove the unreacted starting
material. The aqueous layer was acidified with concentrated HCl to pH=4 while being
cooled in an ice bath. The resulting solution was extracted with methylene chloride
three times. The extracts were dried over MgSO
4 and concentrated to give a solid (17 g). The solid was dissolved in hot ethyl acetate
(22 mL) and hexanes (550 mL) were added to the solution. The solution was slowly cooled
down to room temperature before putting into a freezer reading at -22 to - 24 °C.
After two days, the crystals were removed off and the liquid was evaporated
in vacuo to give the desired product as a white foamy solid (9.78 g, 56%). MS calculated for
C
14H
23NO
4: (M+H)
+ 270; found 170.1 (M-Boc+H)
+.
Step A-4
[0181]

(1S,3R)-3-[(tert-Butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic Acid
[0182] To a solution of (1
S,4
S)-4-[(
tert-butoxycarbonyl)amino]-1-isopropylcyclopent-2-ene-1-carboxylic acid (9.78 g, 36.3
mmol) in ethanol (250 mL) was added 10% palladium on carbon (550 mg). The mixture
was shaken under hydrogen at 55 psi overnight and filtered through celite. The filtrate
was evaporated
in vacuo to afford the title compound (9.45 g, 96%). MS calculated for C
14H
25NO
4: (M+H)
+ 272; found 172.1 (M-Boc+H)
+.
Step B
[0183]

tert-Butyl [(1R,3S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]carbamate
[0184] To a solution of (1
S,3
R)-3-[(
tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (100 mg, 0.37 mmol),
N-(3-trifluoromethyl)phenylpiperazine (85 mg, 0.37 mmol) and triethylamine (0.1 mL,
0.74 mmol) in methylene chloride (5 mL) was added benzotriazol-1-yloxytris(dimethylamino)phosphonium
hexafluorophosphate (160 mg, 0.37 mmol). After being stirred at room temperature overnight,
the reaction mixture was diluted with EtOAc and washed with saturated NaHCO
3. The aqueous layer was extracted with EtOAc three times. The combined organic layers
were dried (MgSO
4), concentrated and purified on silica gel eluting with 50% EtOAc/hexanes to 100%
EtOAc, providing 86 mg (52%) of the desired product. MS calculated for C
25H
36F
3N
3O
3: (M+H) 484; found 384.2 (M-Boc+1).
Step C
[0185]

(1R,3S)-3-Isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentanamine
bis(trifluoroacetate)
[0186] tert-Butyl [(1R,
3S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]carbamate
(82 mg, 0.18 mmol) was treated with trifluoroacetic acid (3 mL) in methylene chloride
(3 mL) for 1 h at room temperature. The mixture was concentrated and used for next
step without purification. MS calculated for C
20H
28F
3N
3O: (M+H) 383; found 383.2.
Step D
[0187]

N-[(1R,3S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0188] To a solution of (1R,3S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentanamine
bis(trifluoroacetate) (98 mg, 0.16 mmol), tetrahydro-4H-pyran-4-one (0.044 mL, 0.48
mmol) and triethylamine (0.067 mL, 0.48 mmol) in methylene chloride (5 mL) was added
sodium triacetoxyborohydride (68 mg, 0.32 mmol). After being stirred at room temperature
overnight, the reaction mixture was diluted with EtOAc and washed with saturated Na
2CO
3. The aqueous layer was extracted with EtOAc three times. The combined organic layers
were dried (MgSO
4), concentrated and purified on silica gel eluting with EtOAc to 1% Et
3N/EtOAc providing 63 mg (84%) of the desired product, which was further purified by
HPLC to give the product as diTFA salt. MS calculated for C
25H
36F
3N
3O
2: (M+H) 468; found 468.2.
Example 2
Preparation of N-[(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0189]

[0190] The title compound was prepared in a fashion similar to that for Example 1 starting
from N-(4-trifluoromethylphenyl)piperazine. MS calculated for C
25H
36F
3N
3O
2: (M+H) 468; found 468.2.
Example 3
Preparation of N-[(1R,3S)-3-isopropyl-3-({4-[2-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0191]

[0192] The title compound was prepared in a manner analogous to that for Example 1 starting
from N-(2-trifluoromethylphenyl)piperazine. MS calculated for C
25H
36F
3N
3O
2: (M+H) 468; found 468.2.
Example 4
Preparation of N-[(1R,3S)-3-({4-[3,5-bis(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)-3-isopropylcyclopentyl]tetrahydro-2H-pyran-4-amine
[0193]

[0194] The title compound was prepared in a manner analogous to that for Example 1 starting
from N-(3,5-bistrifluorometylphenyl)piperazine. MS calculated for C
26H
35F
6N
3O
2: (M+H) 536; found 536.2.
Example 5
Preparation of N-[(1R,3S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0195]

Step A
[0196]

3-Methyltetrahydro-4H-pyran-4-one
[0197] To a solution of N,N-diisopropylamine (3.8 mL, 27 mmol) in THF (80 mL) cooled in
an ice bath was added a 1.6 M solution of n-butyllithium in hexanes (17 mL). After
stirring for 15 min, the temperature was lowered down to -78 °C and tetrahydro-4H-pyran-4-one
(2.24 g, 22.4 mmol) in THF (60 mL) and hexamethylphosphoramide (4 mL, 20 mmol) were
added. The resulting mixture was stirred at -78 °C for 30 min before methyl iodide
(7 mL, 100 mmol) was added. The reaction was allowed to warm to 0 °C and stirring
was continued at 0 °C for 1.5 h and at ambient temperature for 30 min. After cooling
back to 0 °C, the reaction was quenched with saturated aqueous NH
4Cl. The resulting solution was extracted with EtOAc three times. The combined extracts
were dried over MgSO
4 and concentrated
in vacuo. Purification by flash chromatography on silica gel (80% hexanes/20% EtOAc to 50%
hexanes/50% EtOAc) provided the desired product.
1H NMR (CDCl
3) □4.30-4.10 (2H, m), 3.75-3.65 (1H, m), 3.35-3.30 (1H, m), 2.70-2.60 (1H, m), 2.42-2.35
(2H, m), 1.00 (3H, d, J=5 Hz).
Step B
[0198]

N-[(1R,3S)-3-Isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0199] To a solution of (1
R,3
S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentanamine
(80 mg, 0.2 mmol), 3-methyltetrahydro-4H-pyran-4-one (71 mg, 0.62 mmol) and triethylamine
(0.12 mL, 0.83 mmol) in dichloromethane (10 mL) was added sodium triacetoxyborohydride
(130 mg, 0.62 mmol). After being stirred at room temperature overnight, the solution
was diluted with dichloromethane. The resulting solution was washed with NaHCO
3 and brine, dried over MgSO
4 and concentrated. The residue was purified on silica gel to give the desired product
which was further separated by chiral HPLC affording four isomers. MS calculated for
C
26H
38F
3N
3O
2: (M+H) 482; found 482.2 for four isomers.
Example 6
Preparation of 3-ethyl-N-[(1R,3S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0200]

Step A
[0201]

3-Ethyltetrahydro-4H-pyran-4-one
[0202] The title compound was prepared using a procedure analogous to that described for
3-methyltetrahydro-4H-pyran-4-one.
1H NMR (CDCl
3) δ 4.20-3.40 (4H, m), 2.60-2.40 (3H, m), 1.40-0.80 (5H, m).
Step B
[0203]

3-Ethyl-N-[(1R,3S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl)carbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0204] The title compound was prepared in a manner analogous to that for Example 5. MS calculated
for C
27H
40F
3N
3O
2: (M+H) 496; found 496.2.
Example 7
Preparation of N-[(1R,3S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]-3-(methoxymethyl)tetrahydro-2H-pyran-4-amine
[0205]

Step A
[0206]

3-(Methoxymethyl)tetrahydro-4H-pyran-4-one.
[0207] To a solution of diisopropylamine (6.1 g, 60 mmol) in THF (100 mL) cooled in an ice
bath was added a 1.6 M solution of n-butyllithium in hexanes (37 mL, 60 mmol). The
resulting solution was cooled to -78 °C. To it was added tetrahydro-4H-pyran-4-one
(5 g, 50 mmol) followed by phosphorous hexamethyltriamide (10 mL, 55 mmol). After
10 min, a solution of bromomethyl methyl ether (25 g, 200 mmol) in THF (50 mL) was
added. Stirring was continued at 0 °C for 1h and at room temperature overnight. The
reaction was quenched by addition of a saturated solution of ammonium chloride in
water. The resulting solution was extracted with ether three times. The combined extracts
were dried over MgSO
4 and concentrated. Flash chromatography on silica gel eluting with 20% ether/petroleum
ether afforded the desired product (0.9 g oil).
1H NMR (CDCl
3) δ 4.2 (2H, m), 4.1 (3H, s), 3.6-3.4 (4H, m), 2.4-2.3 (3H, m).
Step B
[0208]

N-[(1R,3S)-3-isopropyl-3 -({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentyl]-3-(methoxymethyl)tetrahydro-2H-pyran-4-amine
[0209] The title compound was prepared by reductive amination of 3-(methoxymethyl)tetrahydro-4H-pyran-4-one
with (1
R,3
S)-3-isopropyl-3-({4-[3-(trifluoromethyl)phenyl]piperazin-1-yl}carbonyl)cyclopentanamine
using the procedure described for Example 5. MS calculated for C
27H
40F
3N
3O
3: (M+H) 512; found 512.2.
Example 8
Preparation of N-[(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0210]

Step A
[0211]

1-[4-(Trifluoromethyl)pyridin-2-yl]piperazine
[0212] A solution of 2-chloro-4-(trifluoromethyl)pyridine (2.0 g, 11 mmol), piperazine (3
g, 30 mmol) and triethylamine (3.1 mL, 22 mmol) in DMF (10 mL) was heated at 100 °C
overnight and concentrated
in vacuo. The residue was purified by column chromatography on silica gel (EtOAc to EtOAc/MeOH/Et
3N = 9/1/0.5) to give 1.09g (43%) of pure product. MS calculated for C
10H
12F
3N
3: (M+H) 232; found 232.1.
Step B
[0213]

tert-Butyl [(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]carbamate
[0214] To a solution of 1-[4-(trifluoromethyl)pyridin-2-yl]piperazine (145 mg, 0.627 mmol),
(1S,3R)-3-[(
tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (140 mg, 0.52 mmol)
in methylene chloride (10 mL) was added benzotriazol-1-yloxytris(dimethylamino)phosphonium
hexafluorophosphate (253 mg, 0.572 mmol) followed by triethylamine (0.156 mL, 1.12
mmol). After being stirred overnight, the reaction mixture was diluted with EtOAc
and washed with saturated NaHCO
3. The aqueous layer was extracted with EtOAc three times. The combined organic layers
were dried (MgSO
4), concentrated and purified by flash chromatography on silica gel (20% EtOAc/hexanes
to 40%EtOAc/hexanes) to give 0.15 g of desired product. MS calculated for C
24H
35F
3N
4O
3: (M+H) 485; found 385.2 (M-Boc+H).
Step C
[0215]

(1R,3S)-3-Isopropyl-3-({4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl}carbonyl)cyclopentanamine
[0216] tert-Butyl [(1
R,3
S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]carbamate
(150 mg, 0.31 mmol) was treated with a 4.0 M solution of HCl in 1,4-dioxane (10 mL)
at room temperature for 1 hr and concentrated at reduced pressure to give the product
which was used for next step without purification. MS calculated for C
19H
27F
3N
4O: (M+H) 385; found 385.2.
Step D
N-[(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl)carbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0217] To a solution of (1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl}carbonyl)cyclopentanamine
dihydrochloride (140 mg, 0.31 mmol), 3-methyltetrahydro-4H-pyran-4-one (70 mg, 0.61
mmol) and triethylamine (0.21 mL, 1.5 mmol) in methylene chloride (10 mL) was added
sodium triacetoxyborohydride (190 mg, 0.92 mmol). After being stirred overnight, the
reaction mixture was diluted with EtOAc and washed with saturated Na
2CO
3. The aqueous layer was extracted with EtOAc three times. The combined organic layers
were dried (MgSO
4), concentrated and purified by flash chromatography on silica gel (EtOAc to 1% Et
3N/EtOAc to 5% Et
3N/EtOAc) to give 101 mg of product. The product was further separated by chiral HPLC
to give isomer 1 and isomer 2. MS calculated for C
25H
37F
3N
4O
2 (M+1) 483; found 483.2.
Example 9
Preparation of 3-ethyl-N-[(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0218]

[0219] The title compound was prepared using procedures analogous to those described for
Example 8. MS calculated for C
26H
39F
3N
4O
2 (M+1) 497; found 497.2.
Example 10
Preparation of N-[(1R,3S)-3-isopropyl-3-({4-[5-(trifluoromethyl)pyridin-3-yl]piperazin-1-yl}carbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0220]

Step A-1
[0221]

3-Bromo-5-iodopyridine
[0222] To a solution of 3,5-dibromopyridine (48 g, 200 mmol) in THF (200 mL) was added a
2 M solution of isopropylmagnesium chloride in THF (80 mL). After being stirred at
room temperature for 2 h, the solution was cooled to -78 °C. To it was added a precooled
solution of iodine (51 g, 200 mmol) in THF (100 mL). The mixture was diluted with
ether and washed with a saturated solution of ammonium chloride, a 2 M solution of
sodium thiosulfate, and brine. The resulting organic layer was dried over MgSO
4, filtered and concentrated. Crystalization from ethanol gave 33.5g (58%) of desired
product.
1H NMR (CDCl
3) δ 8.75 (1H, s), 8.60 (1H, s), 8.20 (1H, s).
Step A-2
[0223]

tert-Butyl 4-(5-Bromopyridin-3-yl)piperazine-1-carboxylate
[0224] A solution of 3-bromo-5-iodopyridine (13.0 g, 45.8 mmol),
tert-butyl piperazine-1-carboxylate (8.53 g, 45.8 mmol), copper(I) iodide (0.871 g, 4.57 mmol),
K
3PO
4 (19.46 g, 91.68 mmol), 1,2-ethanediol (5.1 mL, 91 mmol) in isopropyl alcohol (80
mL) in a sealed tube was heated at 80 °C in an oil bath for 2 days. After cooling
to room temperature, the reaction mixture was filtered through celite. The filtrate
was concentrated
in vacuo. The residue was taken up in EtOAc and the solution was washed with saturated NaHCO
3, dried (MgSO
4) and concentrated. Purification by flash chromatography on silica gel (20% EtOAc/hexanes
to 30% EtOAc/hexanes) afforded 5.75 g (37%) of desired product. MS calculated for
C
14H
20BrN
3O
2: (M+H) 343; found 342.0, 344.0.
Step A-3
[0225]

tert-Butyl 4-(5-Iodopyridin-3-yl)piperazine-1-carboxylate
[0226] To a solution of
tert-butyl 4-(3-bromophenyl)piperazine-1-carboxylate (2.0 g, 5.9 mmol) in THF (20 mL)
was added a 2 M solution of isopropylmagnesium chloride in THF (5 mL). After being
stirred at room temperature for 2 h, the solution was cooled to -78 °C. To it was
added a precooled solution of iodine (3.0 g, 12 mmol) in THF (2 mL). After being stirred
at -78 °C for 30 min and at room temperature for another 30 min, the mixture was diluted
with ethyl acetate, washed with saturated ammonium chloride, 2 M solution of sodium
thiosulfate and brine, dried (MgSO
4) and concentrated. The residue was purified by flash chromatography on silica gel
(20% EtOAc/hexanes to 50% EtOAc/hexanes) to give the disired product (1.40 g) in 75%
purity. MS calculated for C
15H
21IN
2O
2· (M+H) 390; found 390.0.
Step A-4
[0227]

tert-Butyl 4-[5-(Trifluoromethyl)pyridin-3-yl]piperazine-1-carboxylate
[0228] Copper(I) iodide (0.49 g, 2.6 mmol) and potassium fluoride (0.15 g, 2.6 mmol) in
a flask were flame-heated under gentle shaking and at high vacuum until a greenish
color appeared. A solution of
tert-butyl 4-(3-iodophenyl)piperazine-1-carboxylate (0.5 g, 1.0 mmol) and (trifluoromethyl)trimethylsilane
(0.37 g, 2.6 mmol) in DMF (5 mL) was added. The brown solution was stirred at room
temperature overnight. More (trifluoromethyl)trimethylsilane (0.37g) was added. The
mixture was heated at 50 °C overnight, diluted with EtOAc and washed with saturated
ammonium chloride. The aqueous layer was extracted with EtOAc three times. The combined
organic layers were dried (MgSO
4), concentrated and purified by flash chromatography on silica gel (20% to 40% EtOAc/hexanes)
to give 120 mg of desired product. MS calculated for C
15H
20F
3N
3O
2: (M+H) 332; found 332.1.
Step A-5
[0229]

1-[5-(Trifluoromethyl)pyridin-3-yl]piperazine
[0230] tert-Butyl 4-[5-(trifluoromethyl)pyridin-3-yl]piperazine-1-carboxylate (0.24 g, 0.25 mmol) was
treated with a 4.0 M solution of HCl in 1,4-dioxane (7 mL) at room temperature for
1 h and concentrated. The residue was used for next step without further purification.
MS calculated for C
10H
12F
3N
3: (M+H) 232; found 232.1.
Step B
[0231]

tert-Butyl [(1R,3S)-3-Isopropyl-3-({4-[5-(trifluoromethyl)pyridin-3-yl]piperazin-1-yl}carbonyl)cyclopentyl]carbamate
[0232] To a solution of 1-[5-(trifluoromethyl)pyridin-3-yl]piperazine trihydrochloride (0.22
g, 0.23 mmol), (1
S,3
R)-3-[(
tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (0.18 g, 0.66 mmol)
in methylene chloride (10 mL) was added benzotriazol-1-yloxytris(dimethylamino)phosphonium
hexafluorophosphate (0.338 g, 0.764 mmol) followed by triethylamine (0.22 mL, 1.6
mmol). The mixture was stirred at room temperature overnight and diluted with EtOAc.
The solution was washed with saturated NaHCO
3, dried (MgSO
4) and concentrated. The residue was purified by flash chromatography on silica gel
(20% EtOAc/hexanes to 40%EtOAc/hexanes) to give 0.19 g (61%) of desired product. MS
calculated for C
24H
35F
3N
4O
3: (M+H) 485; found 485.2.
Step C
[0233]

(1R,3S)-3-Isopropyl-3-({4-[5-(trifluoromethyl)pyridin-3-yl]piperazin-1-yl}carbonyl)cyclopentanamine
[0234] tert-Butyl [(1
R,3
S)-3-isopropyl-3-({4-[5-(trifluoromethyl)pyridin-3-yl]piperazin-1-yl}carbonyl)cyclopentyl]carbamate
(190 mg, 0.14 mmol) was treated with a 4.0 M solution of HCl in 1,4-dioxane (5 mL)
for 1 h at room temperature. The mixture was concentrated and purified by HPLC to
provide 35 mg of desired product. MS calculated for C
19H
27F
3N
4O; (M+H) 385; found 385.1.
Step D
[0235]

N-[(1R,3S)-3-Isopropyl-3-({4-[5-(trifluoromethyl)pyridin-3-yl]piperazin-1-yl}carbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0236] To a solution of (1R,3S)-3-isopropyl-3-({4-[5-(trifluoromethyl)pyridin-3-yl]piperazin-1-yl}carbonyl)cyclopentanamine
tris(trifluoroacetate) (25 mg, 0.034 mmol), 3-methyltetrahydro-4H-pyran-4-one (11
mg, 0.10 mmol) and triethylamine (0.024 mL, 0.17 mmol) in methylene chloride (2 mL)
was added sodium triacetoxyborohydride (22 mg, 0.10 mmol). The mixture was stirred
under N
2 at room temperature overnight and diluted with EtOAc. The resulting solution was
washed with saturated NaHCO
3, dried (MgSO
4), and concentrated. The residue was purified by flash chromatography on silica gel
(EtOAc to EtOAc/MeOH/Et
3N=9:1:0.5) to give 14 mg of desired product as a mixture of two isomers. The two isomers
were separated by chiral HPLC to give peak 1 and peak 2. MS calculated for C
25H
37F
3N
4O
2: (M+H) 483; found 483.2.
Example 11
Preparation of 3-ethyl-N-[(1R,3S)-3-isopropyl-3-({4-[5-(trifluoromethyl)pyridin-3-yl]piperazin-1-yl}carbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0237]

[0238] The title compound was prepared in a manner analogous to that for Example 10. MS
calculated for C
26H
39F
3N
4O
2: (M+H) 497; found 497.2.
Example 12
Preparation of N-{(1R,3S)-3-isopropyl-3-[(4-phenyl-3,6-dihydropyridin-1(2H)-yl)carbonyl]cyclopentyl}tetrahydro-2H-pyran-4-amine
[0239]

Step A
[0240]

tert-Butyl {(1R,3S)-3-Isopropyl-3-[(4-phenyl-3,6-dihydropyridin-1(2H)-yl)carbonyl]cyclopentyl}carbamate
[0241] In a dried flask, (1S,3R)-3-[(tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic
acid (200 mg, 0.7 mmol) and 4-phenyl-1,2,3,6-tetrahydropyridine (160 mg, 0.81 mmol)
were suspended in methylene chloride (4 mL) under N
2. Triethylamine (0.22 g, 2.2 mmol) was added followed by benzotriazol-1-yloxytris(dimethylamino)phosphonium
hexafluorophosphate (0.36 g, 0.81 mmol). The reaction was stirred overnight at room
temperature and quenched by addition of saturated NaHCO
3 solution. The resulting solution was extracted with methylene chloride three times.
The combined extracts were dried (MgSO
4), filtered and concentrated. Purification by flash chromatography on silica gel (gradient:
0 - 45% B over 15 min. Bottle A = hexanes, bottle B = EtOAc) to give 234 mg (80%)
of desired product. MS calculated for C
25H
36N
2O
3: (M+H) 413; found 413.2.
Step B
[0242]

(1R,3S)-3-Isopropyl-3-[(4-phenyl-3,6-dihydropyridin-1(2H)-yl)carbonyl]cyclopentanamine
[0243] tert-Butyl {(1
R,3
S)-3-isopropyl-3-[(4-phenyl-3,6-dihydropyridin-1(2H)-yl)carbonyl]cyclopentyl}carbamate
(0.23 g, 0.56 mmol) was dissolved in a 1.0 M solution of HCl in ether (4 mL). After
being stirred at room temperature for 2 h, the solution was concentrated to give a
colorless oil (170 mg). MS calculated for C
20H
28N
2O: (M+H) 313; found 313.2.
Step C
[0244]

N-{(1R,3S)-3-Isopropyl-3-[(4-phenyl-3,6-dihydropyridin-1(2H)-yl)carbonyl]cyclopentyl}tetrahydro-2H-pyran-4-amine
[0245] To a solution of (1
R,3
S)-3-isopropyl-3-[(4-phenyl-3,6-dihydropyridin-1(2H)-yl)carbonyl]cyclopentanamine hydrochloride
(50 mg, 0.1 mmol), tetrahydro-4H-pyran-4-one (43 mg, 0.43 mmol), and triethylamine
(0.070 mL, 0.50 mmol) in methylene chloride (2 mL) was added sodium triacetoxyborohydride
(91 mg, 0.43 mmol). After being stirred at room temperature overnight, saturated NaHCO
3 was added. The solution was extracted with methylene chloride three times. The combined
extracts were dried (MgSO
4), filtered, and concentrated. Purification by flash chromatography on silica gel
(gradient: 0 - 15% B over 15 min. Bottle A = 1% NH
4OH/3% MeOH/EtOAc, Bottle B = 1% NH
4OH/MeOH) afforded the desired compound. MS calculated for C
25H
36N
2O
2: (M+H) 397; found 397.2.
Example 13
Preparation of N-{(1R,3S)-3-isopropyl-3-[(4-phenyl-3,6-dihydropyridin-1(2H)-yl)carbonyl]cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0246]

[0247] The title compound was prepared using procedures analogous to those described for
Example 12. MS calculated for C
26H
38N
2O
2: (M+H) 411; found 411.1.
Example 14
Preparation of N-{(1R,3S)-3-isopropyl-3-[(4-phenylpiperidin-1-yl)carbonyl]cyclopentyl}tetrahydro-2H-pyran-4-amine
[0248]

[0249] To a solution of N-{(1
R,3
S)-3-isopropyl-3-[(4-phenyl-3,6-dihydropyridin-1(2H)-yl)carbonyl]cyclopentyl}tetrahydro-2H-pyran-4-amine
(22 mg, 0.055 mmol) in methanol (2.0 mL) under N
2 was added palladium (10 mg) (10% dry weight on wet activated carbon). The reaction
mixture was stirred at room temperature under H
2 (1 atm) overnight (22 h) and filtered through celite. The celite was washed with
methylene chloride and the filtrate was concentrated to give 20 mg of desired product
after lyophilization. MS calculated for C
25H
38N
2O
2: (M+H) 399; found 399.2.
Example 15
Preparation of 1-[((1S,3R)-1-isopropyl-3-{[3-methyltetrahydro-2H-pyran-4-yl]amino}cyclopentyl)carbonyl]-4-[3-(trifluoromethyl)phenyl]piperidin-4-ol
[0250]

Step A-1
[0251]

tert-Butyl 4-hydroxy-4-[2-(trifluoromethyl)phenyl]piperidine-1-carboxylate
[0252] To a solution of 1-bromo-2-(trifluoromethyl)benzene (1.18 g, 5.24 mmol) in THF (20
mL) cooled at -78 °C was dropwise added a 1.60 M solution of n-butyllithium in hexane
(3.4 mL). After being stirred for 40 min, a solution of
tert-butyl 4-oxo-1-piperidinecarboxylate (1.0 g, 5.0 mmol) in THF (3 mL) was added and the solution
stirred for 1 h at -78 °C. The reaction was quenched with saturated ammonium chloride.
The resulting solution was extracted with methylene chloride three times. The combined
extracts were dried (MgSO
4), filtered, and concentrated to give 0.78 g of a white solid which was used for the
next reaction without purification. MS calculated for C
17H
22F
3NO
3: (M+H) 346; found 246.0 (M-Boc+1).
Step A-2
[0253]

4-[2-(Trifluoromethyl)phenyl]piperidin-4-ol
[0254] tert-Butyl 4-hydroxy-4-[2-(trifluoromethyl)phenyl]piperidine-1-carboxylate (0.40
g, 1.0 mmol) was dissolved in a 2.0 M solution of HCl in ether (5 mL). After being
stirred at room temperature overnight, the solution was diluted with ether. The white
solid was filtered and washed with ether to give 170 mg of pure product. MS calculated
for C
12H
14F
3NO: (M+H) 246; found 246.1.
Step B
[0255]

tert-Butyl [(1R,3S)-3-({4-hydroxy-4-[2-(trifluoromethyl)phenyl]piperidin-1-yl)carbonyl)-3-isopropylcyclopentyl]carbamate
[0256] To a solution of (1
S,3
R)-3-[(tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (150 mg, 0.55
mmol), 4-[2-(trifluoromethyl)phenyl]piperidin-4-ol hydrochloride (170 mg, 0.60 mmol),
and triethylamine (0.17 g, 1.6 mmol) in methylene chloride (3 mL) was added (benzotriazol-1-yloxy)tripyrrolidinophosphonium
hexafluorophosphate (0.31 g, 0.60 mmol). After being stirred for 2.5 h, the reaction
was quenched by addition of a saturated NaHCO
3 solution. The resulting solution was extracted with methylene chloride three times.
The combined extracts were dried (MgSO
4), filtered, and concentrated. The crude product was carried on to the next step without
purification. MS calculated for C
26H
37F
3N
2O
4: (M+H) 499; found 499.2.
Step C
[0257]

1-{[(1S,3R)-3-Amino-1-isopropylcyclopentyl]carbonyl}-4-[2-(trifluoromethyl)phenyl]piperidin-4-ol
[0258] To a flask containing
tert-butyl [(
1R,3S)-3
-({4-hydroxy-4-[2-(trifluoromethyl)phenyl]piperidin-1-yl}carbonyl)-3-isopropylcyclopentyl]carbamate
(0.27 g, 0.54 mmol) was added a 2.00 M solution of HCl in ether (5 mL) and the resulting
mixture stirred for 3.5 h. The solution was concentrated to give an oil which was
used in the next reaction without purification. MS calculated for C
21H
29F
3N
2O
2: (M+H)399; found 399.2.
Step D
1-({(1S,3R)-1-Isopropyl-3-[(3-methyltetrahydro-2H-pyran-4-yl)amino]cyclopentyl}carbonyl)-4-[2-(trifluoromethyl)phenyl]piperidin-4-ol
[0259] To a solution of 1-{[(1S,3R)-3-amino-1-isopropylcyclopentyl]carbonyl}-4-[2-(trifluoromethyl)phenyl]piperidin-4-ol
hydrochloride (50 mg, 0.1 mmol), 3-methyltetrahydro-4H-pyran-4-one (39 mg, 0.34 mmol),
and triethylamine (0.048 mL, 0.34 mmol) in methylene chloride (5 mL) was added sodium
triacetoxyborohydride (73 mg, 0.34 mmol). After being stirred overnight at room temperature,
a saturated solution of NaHCO
3 was added. The solution was extracted with methylene chloride three times. The combined
extracts were dried (MgSO
4), filtered, and concentrated. Purification by flash chromatography on silica gel
(0 - 20% B over 15 min. Bottle A = 1% NH
4OH/2% MeOH/EtOAc, Bottle B = 1% NH
4OH/MeOH) afforded the desired product as an oil. MS calculated for C
27H
39F
3N
2O
3: (M+H) 497; found 497.2.
Example 16
Preparation of 1-[(1S,3R)-1-isopropyl-3-{[3-methyltetrahydro-2H-pyran-4-yl]amino}cyclopentyl)carbonyl]-4-[4-(trifluoromethyl)phenyl]piperidin-4-ol
[0260]

[0261] The title compound was prepared using procedures analogous to those described for
Example 15. MS calculated for C
27H
39F
3N
2O
3: (M+H) 497; found 497.2.
Example 17
Preparation of N-((1R,3S)-3-isopropyl-3-{[4-[2-(trifluoromethyl)phenyl]-3,6-dihydropyridin-1(2H)-yl]carbonyl}cyclopentyl)tetrahydro-2H-pyran-4-amine
[0262]

Step A-1
[0263]

tert-Butyl 4-[2-(trifluoromethyl)phenyl]-3,6-dihydropyridine-1(2H)-carboxylate
[0264] To a solution of
tert-butyl 4-hydroxy-4-[2-(trifluoromethyl)phenyl]piperidine-1-carboxylate (0.75 g, 2.2 mmol)
in pyridine (15 mL) cooled in an ice bath was slowly added thionyl chloride (0.79
mL, 11 mmol) and the mixture was warmed to room temperature and stirred overnight
(17 h). The reaction was quenched with ice water. The resulting solution was extracted
with methylene chloride three times. The combined extracts were dried (MgSO
4), filtered, and concentrated. Purification by flash chromatography on silica gel
(0 - 40% B over 25 min. Bottle A = hexanes, Bottle B = EtOAc) gave 209 g of the desired
product as a solid. MS calculated for C
17H
20F
3NO
2: (M+H) 328; found 228.0 (M-Boc+H).
Step A-2
[0265]

4-[2-(Trifluoromethyl)phenyl]-1,2,3,6-tetrahydropyridine
[0266] To a solution of tert-butyl 4-[2-(trifluoromethyl)phenyl]-3,6-dihydropyridine-1(2H)-carboxylate
(200 mg, 0.61 mmol) in methylene chloride (5 mL) was added trifluoroacetic acid (2.5
mL). After being stirred at room temperature for 45 min, the solution was concentrated
to give an oil. MS calculated for C
12H
12F
3N: (M+H) 228; found 228.1.
Step B
[0267]

tert-Butyl ((1R,3S)-3Iisopropyl-3-{[4-phenyl-2-(trifluoromethyl)-3,6-dihydropyridin-1(2H)-yl]carbonyl)cyclopentyl)carbamate
[0268] To a solution of (1
S,3
R)-3-[(
tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (115 mg, 0.424 mmol)
and 4-[2-(trifluoromethyl)phenyl]-1,2,3,6-tetrahydropyridine trifluoroacetate (152
mg, 0.445 mmol) in methylene chloride (2 mL) was added triethylamine (0.21 g, 2.1
mmol) followed by benzoiriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate
(210 mg, 0.47 mmol). After being stirred overnight at room temperature, the reaction
was quenched with saturated NaHCO
3 solution. The resulting solution was extracted with methylene chloride three times.
The combined extracts were dried (MgSO
4), filtered, and concentrated. Purification by flash chromatography on silica gel
(0 - 50% B over 15 min. Bottle A = hexanes, Bottle B = EtOAc) provided 174 mg of desired
product as a white solid. MS calculated for C
26H
35F
3N
2O
3: (M+H) 481; found 481.1.
Step C
[0269]

(1R,3S)-3-Isopropyl-3-{[4-[2-(trifluoromethyl)phenyl]-3,6-dihydropyridin-1(2H)-yl]carbonyl}cyclopentanamine
[0270] tert-Butyl ((1
R,3
S)-3-isopropyl-3-{[4-[2-(trifluoromethyl)phenyl]-3,6-dihydropyridin-1(2H)-yl]carbonyl}cyclopentyl)carbamate
(0.17 g, 0.00035 mol) was dissolved in a 2.0 M solution of HCl in ether (2.2 mL).
After being stirred for 2 h at room temperature, the solution was concentrated to
give 144 mg of desired product as a clear oil. MS calculated for C
21H
27F
3N
2O: (M+H) 381; found 381.1.
Step D
[0271]

N-((1R,3S)-3-Isopropyl-3-([4-[2-(trifluoromethyl)phenyl]-3,6-dihydropyridin-1(2H)-yl]carbonyl)cyclopentyl)tetrahydro-2H-pyran-4-amine
[0272] To a solution of (1
R,3
S)-3-isopropyl-3-{[4-[2-(trifluoromethyl)phenyl]-3,6-dihydropyridin-1(2H)-yl]carbonyl}cyclopentanamine
hydrochloride (46 mg, 0.11 mmol), tetrahydro-4H-pyran-4-one (33 mg, 0.33 mmol), and
triethylamine (0.054 mL, 0.39 mmol) in methylene chloride (2 mL) was added sodium
triacetoxyborohydride (70 mg, 0.33 mmol). After being stirred overnight at room temperature,
a saturated NaHCO
3 solution was added. The resulting solution was extracted with methylene chloride
three times. The combined extracts were dried (MgSO
4), filtered, and concentrated. Purification by flash chromatography on silica gel
(0 - 20% B over 15 min. Bottle A = 1% NH
4OH/2% MeOH/EtOAc, Bottle B = 1% NH
4OH/MeOH) provided the desired product. MS calculated for C
26H
35F
3N
2O
2: (M+H) 465; found 465.2.
Example 18
Preparation of N-((1R,3S)-3-isopropyl-3-{[4-[3-(trifluoromethyl)phenyl)-3,6-dihydropyridin-1(2H)-yl]carbonyl}cyclopentyl)tetrahydro-2H-pyran-4-amine
[0273]

[0274] The title compound was prepared in a manner analogous to that described for Example
17. MS calculated for C
26H
35F
3N
2O
2: (M+H) 465; found 465.2.
Example 19
Preparation of N-((1R,3S)-3-isopropyl-3-{[4-[3-(trifluoromethyl)phenyl]-3,6-dihydropyridin-1(2H)-yl]carbonyl}cyclopentyl)-3-methyltetrahydro-2H-pyran-4-amine
[0275]

[0276] The title compound was prepared in a manner analogous to that described for Example
17. MS calculated for C
27H
37F
3N
2O
2: (M+H) 479; found 479.2.
Example 20
Preparation of 3-ethyl-N-((1R,3S)-3-isopropyl-3-{[4-[3-(trifluoromethyl)phenyl]-3,6-dihydropyridin-1(2H)-yl] carbonyl}cyclopentyl)tetrahydro-2H-pyran-4-amine
[0277]

[0278] The title compound was prepared in a manner analogous to that described for Example
17. MS calculated for C
28H
39F
3N
2O
2: (M+H) 492; found 492.2.
Example 21
Preparation of N-((1R,3S)-3-isopropyl-3-{[4-(trifluoromethyl)-3',6'-dihydro-2,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentyl)-3-methyltetrahydro-2H-pyran-4-amine
[0279]

Step A-1
[0280]

2-Bromo-4-(trifluoromethyl)pyridine
[0281] A mixture of 2-chloro-4-(trifluoromethyl)pyridine (2.70 g, 14.9 mmol) and bromotrimethylsilane
(3.90 mL, 29.6 mmol) in propanenitrile (15.0 mL) was heated under reflux for 22 h.
The product (very volatile) was carefully rotary evaporated to give 4.07 g (propanenitrile
contained) of thick light brown suspension w/o further purification. LC-MS calculated
for C
6H
3BrF
3N (M+H) 226.9; found 225.9/227.8.
Step A-2
[0282]

tert-Butyl 4-Hydroxy-4-[4-(trifluoromethyl)pyridin-2-yl]piperidine-1-carboxylate
[0283] To a slightly cloudy solution of 2-bromo-4-(trifluoromethyl)pyridine (4.0 g, 14.2
mmol) in dry methylene chloride (52.7 mL) cooled at -78 °C was added a 1.6 M solution
of n-butyllithium in hexanes (9.65 mL). After being stirred for 40 min at -78 °C,
a solution of
tert-butyl 4-oxo-1-piperidinecarboxylate (2.59 g, 12.9 mmol) in dry methylene chloride
(10.0 mL) was added dropwise. The reaction was stirred at -78 °C for 1 h and quenched
with aqueous NH4 Cl. THF was removed by rotary evaporation. The aqueous layer was
extracted with methylene chloride three times. The combined organic layers were dried,
filtered and concentrated. The residue was purified by column chromatography on silica
gel (30:70 EtOAc/hexanes) to give 2.63 g (59%) of desired product as a brown oil.
LC-MS calculated for C
16H
21F
3N
2O
3: (M+H) 347; found 247.0 (M-Boc+1).
Step A-3
[0284]

tert-Butyl 4-(trifluoromethyl)-3',6'-dihydro-2,4'-bipyridine-1'(2'H)-carboxylate
[0285] To a solution of
tert-butyl 4-hydroxy-4-[4-(trifluoromethyl)pyridin-2-yl]piperidine-1-carboxylate (2.00
g, 2.31 mmol) in pyridine (15.9 mL) cooled in an ice bath was slowly added thionyl
chloride (0.84 mL, 12 mmol). The mixture was allowed to warm to room temperature and
stirred overnight (17 h). The brown reaction mixture was quenched with ice water and
extracted with methylene chloride three times. The combined extracts were dried (MgSO
4), filtered, and concentrated. The residue was purified by flash chromatography on
silica gel (0 - 10% B over 25 min. Bottle A = hexanes, Bottle B = EtOAc) to give 404
mg (53%) of desired product as light brown oil. LC-MS calculated for C
16H
19F
3N
2O
2: (M+H) 329; found 273.1 (M-tBu+1).
Step A-4
[0286]

4-(Trifluoromethyl)-1,2,3,6'-tetrahydro-2,4'-bipyridine
[0287] tert-Butyl 4-(trifluoromethyl)-3',6'-dihydro-2,4'-bipyridine-1'(2'H)-carboxylate (380.0 mg,
1.157 mmol) was dissolved in a 4 M solution of HCl in 1,4-dioxane (12.0 mL) to form
a light yellow clear (then cloudy) solution. After being stirred at room temperature
for 1 h, the reaction mixture was
concentrated in vacuo to afford 389 mg of product as a yellow gum. LC-MS calculated for C
11H
11F
3N
2: (M+H) 229; found 229.1.
Step B
[0288]

tert-Butyl ((1R,3S)-3-isopropyl-3-{[4-(trifluoromethyl)-3',6'-dihydro-2,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentyl)carbamate
[0289] To a solution of (1S
,3
R)-3-[(tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (0.288 g,
1.06 mmol) and 4-(trifluoromethyl)-1',2',3',6'-tetrahydro-2,4'-bipyridine dihydrochloride
(0.320 g, 1.06 mmol) in dry methylene chloride (11.5 mL) was added triethylamine (0.592
mL, 4.25 mmol) followed by benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate
(0.517 g, 1.17 mmol). After being stirred at room temperature overnight, the brown
reaction mixture was washed with NaHCO
3 and brine, dried (MgSO
4), filtered, and concentrated. The residue was purified by column chromatography on
silica gel (30:70 EtOAc/hexanes) to provide a light yellow solid product: 265 mg (52%).
LC-MS calculated for C
25H
34F
3N
3O
3: (M+H) 482; found 382.2 (M-Boc+1).
Step C
[0290]

(1R,3S)-3-Isopropyl-3-{[4-(trifluoromethyl)-3,6'-dihydro-2,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentanamine
[0291] tert-Butyl ((1R,3S)-3-isopropyl-3-{[4-(trifluoromethyl)-3',6'-dihydro-2,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentyl)carbamate
(260.0 mg, 0.54 mmol) was dissolved in a 4 M solution of HCl in 1,4-dioxane (6 mL)
to form a light yellow clear solution. After being stirred at room temperature for
1 h, the reaction mixture was
concentrated in vacuo to afford 300 mg of product as di-HCl salt. The solid was treated with a 1 M solution
of NaOH. The free base was extracted with methylene chloride three times. The combined
extracts were dried, filtered and concentrated to provide 194 mg (94%) of product
as a light yellow gum. LC-MS calculated for C
20H
26F
3N
3O (M+H) 382; found 382.1.
Step D
N-((1R,3S)-3-Isopropyl-3-{[4-(trifluoromethyl)-3',6'-dihydro-2,4'-bipyridin-1'(2'H)-yl]carbonyl)cyclopentyl)-3-methyltetrahydro-2H-pyran-4-amine
[0292] To a solution of (1R,3S)-3-isopropyl-3-{[4-(trifluoromethyl)-3',6'-dihydro-2,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentanamine
(51 mg, 0.13 mmol), 3-methyltetrahydro-4H-pyran-4-one (46 mg, 0.4 mmol) and triethylamine
(0.037 mL, 0.27 mmol) in dry methylene chloride (5 mL) was treated with sodium triacetoxyborohydride
(85 mg, 0.40 mmol) at room temperature under N
2 overnight. The reaction was quenched with aqueous NaHCO
3 and diluted with methylene chloride. The organic layer was separated and the aqueous
layer was extracted with methylene chloride three times. The combined extracts were
dried over MgSO
4, filtered and evaporated under reduced pressure. The crude product (90 mg) was passed
through a short silica gel pad (30:70 MeOH/EtOAc). The filtrate was concentrated and
separated by chiral HPLC to give two isomers: first isomer; second isomer:. MS calculated
for C
26H
36F
3N
3O
2: (M+H) 480; found 480.1 for both isomers.
Example 22
Preparation of 3-ethyl-N-((1R,3S)-3-isopropyl-3-{[4-(trifluoromethyl)-3',6'-dihydro-2,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentyl)tetrahydro-2H-pyran-4-amine
[0293]

[0294] The title compound was prepared using a sequence analogous to that described for
Example 21. MS calculated for C
27H
38F
3N
3O
2: (M+H) 494; found 494.2 for both isomers.
Example 23
Preparation of N-((1R,3S)-3-isopropyl-3-{[5-(trifluoromethyl)-3',6'-dihydro-3,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentyl)-3-methyltetrahydro-2H-pyran-4-amine
[0295]

Step A-1
[0296]

3-Nitro-5-(trifluoromethyl)pyridin-2-ol
[0297] 5-(Trifluoromethyl)pyridin-2-ol (10.0 g, 61.31 mmol) was added to a stirring concentrated
sulfuric acid (50.0 mL) at room temperature. The resulting clear solution was placed
in an ice water bath, and potassium nitrate (12.4 g, 123 mmol) was added slowly while
maintaining the temperature at 0 °C. The resulting mixture was heated at 65 °C for
4 h before pouring onto ice and treated carefully with 50% NaOH (83 mL) until pH=8.
The aqueous solution was extracted with EtOAc three times. The combined extracts were
dried, filtered and concentrated to give 9.78 (77%) of crude product (>90% purity)
as a yellow solid. Further purification by trituration with EtOAc gave 8.40 g of pure
product. LC-MS calculated for C
6H
3F
3N
2O
3: (M+H) 209; found 209.0.
Step A-2
[0298]

2-Chloro-3-nitro-5-(trifluoromethyl)pyridine
[0299] To a solution of phosphoryl chloride (2.0 mL, 21.2 mmol) and quinoline (1.30 mL,
10.8 mmol) was added solid powder 3-nitro-5-(trifluoromethyl)pyridin-2-ol (4.00 g,
18.3 mmol) (95% purity). The resulting dark brown thick suspension was heated to reflux
for 4 h and gradually turned into a very cloudy dark brown solution. After cooling
to 100 °C, water (11 mL) was slowly added to the mixture which was further cooled
to room temperature and neutralized carefully with Na
2CO
3. The resulting solution was extracted with EtOAc three times. The extracts were combined,
dried over MgSO
4, filtered, and evaporated
in vacuo. The residue was purified by flash chromatography on silica gel (EtOAc/hexanes 30:70)
to afford 2.28 g of desired product.
Step A-3
[0300]

5-(Trifluoromethyl)pyridin-3-amine
[0301] To a solution of 2-chloro-3-nitro-5-(trifluoromethyl)pyridine (1.25 g, 5.518 mmol)
in methanol (25.0 mL) under N
2 was added palladium (1.17 g, 1.10 mmol) (10% dry weight on wet activated carbon).
The reaction mixture was placed on a Parr apparatus and hydrogenated at 50 psi for
90 min. The catalyst was filtered off through a celite pad. The filtrate was concentrated
to give a crude product (1.08 g) which was pure (>98% by HPLC) enough without further
purification. LC-MS calculated for C
6H
5F
3N
2: (M+H) 163; found 163.1.
Step A-4
[0302]

3-Bromo-5-(trifluoromethyl)pyridine
[0303] A solution of sodium nitrite (402 mg, 5.83 mmol) in water (6.8 mL) was added slowly
to a suspension of 5-(trifluoromethyl)pyridin-3-amine (947 mg, 5.55 mmol) in hydrogen
bromide (48% aqueous solution, 1.57 mL) in ice-water bath. After being stirred for
10 min, the resulting orange diazo solution was directly but slowly transferred to
a stirring mixture of copper(I) bromide (876 mg, 6.11 mmol) and hydrogen bromide (48%
aqueous solution, 0.38 mL). The resulting brown mixture was heated at 60 °C for 1
h. After cooling to room temperature, the mixture was diluted with methylene chloride,
washed with 50% NaOH (until pH = 11), and water. The aqueous layer was back extracted
with methylene chloride. The combined organic extracts were carefully concentrated
under vacuum to provide crude product without purification.
Step A-5
[0304]

tert-Butyl 4-hydroxy-4-[5-(trifluoromethyl)pyridin-3-yl]piperidine-1-carboxylate
[0305] To a slightly cloudy solution of 3-bromo-5-(trifluoromethyl)pyridine (2.20 g, 30%
purity, 2.92 mmol) in dry methylene chloride (15.0 mL) at -78 °C was added a 1.6 M
solution of
n-butyllithium in hexanes (1.99 mL). After being stirred for 30 min at -78 °C, a solution
of
tert-butyl 4-oxo-1-piperidinecarboxylate (0.534 g, 2.65 mmol) in dry methylene chloride (3.0
mL) was added dropwise. The reaction was stirred at -78 °C for 1.5 h and quenched
with aqueous NH
4Cl. The resulting solution was extracted with methylene chloride three times. The
combined organic layers were dried, filtered and concentrated. The residue was purified
by column chromatography on silica gel (50:50 EtOAc/hexanes) to give 330 mg (25%)
of desired product as a yellow oil. LC-MS calculated for C
16H
21F
3N
2O
3: (M+H) 347; found 247.1 (M-Boc+1).
Step A-6
[0306]

tert-Butyl 5-(trifluoromethyl)-3',6'-dihydro-3,4'-bipyridine-1'(2'H)-carboxylate
[0307] To a solution of
tert-butyl 4-hydroxy-4-[5-(trifluoromethyl)pyridin-3-yl]piperidine-1-carboxylate (300
mg, 0.433 mmol) in pyridine (3.00 mL) cooled in an ice bath was added thionyl chloride
(0.158 mL, 2.16 mmol). After being stirred at room temperature overnight (16 h), the
brown reaction mixture was quenched with ice water and extracted with methylene chloride
three times. The combined extracts were dried (MgSO
4), filtered, and concentrated. Purification by flash chromatography on silica gel
(0 - 20% B over 35 min. Bottle A = hexanes, Bottle B = EtOAc) provided 65 mg (46%)
of desired product as a light yellow oil. LC-MS calculated for C
16H
19F
3N
2O
2: (M+H) 329; found 329.1.
Step A-7
[0308]

5-(Trifluoromethyl)-1',2',',3',6'-tetrahydro-3,4'-bipyridine
[0309] tert-Butyl 5-(trifluoromethyl)-3',6'-dihydro-3,4'-bipyridine-1'(2'H)-carboxylate (50.0
mg, 0.152 mmol) was dissolved in a 4 M solution of HCl in 1,4-dioxane (2 mL) to form
a light yellow clear (then cloudy) solution. After being stirred at room temperature
for 1 h, the reaction mixture was
concentrated in vacuo to afford 40.0 mg (87%) of product as a yellow gum. LC-MS calculated for C
11H
11F
3N
2: (M+H) 229; found 229.0.
Step B
[0310]

tert-Butyl ((1R,3S)-3-isopropyl-3-{[5-(trifluoromethyl)-3',6'-dihydro-3,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentyl)carbamate
[0311] To a solution of (1S,3R)-3-[(tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic
acid (40.0 mg, 0.147 mmol) and 5-(trifluoromethyl)-1',2',3',6'-tetrahydro-3,4'-bipyridine
dihydrochloride (44.4 mg, 0.147 mmol) in dry methylene chloride (2.5 mL) was added
triethylamine (0.103 mL, 0.737 mmol) followed by benzotriazol-1-yloxytris(dimethylamino)phosphonium
hexafluorophosphate (71.7 mg, 0.162 mmol). After being stirred at room temperature
overnight, the reaction was quenched with aqueous NaHCO
3. The resulting solution was extracted with methylene chloride three times. The combined
extracts were dried, filtered, concentrated. The residue was purified by silica gel
column (30:70 EtOAc/hexanes, then gradient elution up to 50:50 EtOAc/hexanes) to provide
a pale yellow gel product: 24 mg (34%). LC-MS calculated for C
25H
34F
3N
3O
3: (M+H) 482; found 382.0 (M-Boc+1).
Step C
[0312]

(1R,3S)-3-Isopropyl-3-{{5-(trifluoromethyl)-3',6'-dihydro-3,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentanamine
[0313] tert-Butyl ((1
R,3
S)-3-isopropyl-3-{[5-(trifluoromethyl)-3',6'-dihydro-3,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentyl)carbamate
(24.0 mg, 0.0498 mmol) was dissolved in a 4 M solution of HCl in 1,4-dioxane (2.0
mL) to form a light yellow clear solution. After being stirred at room temperature
for 1 h, the reaction mixture was concentrated
in vacuo. The residue was treated with a 1 M solution of NaOH and the solution was extracted
with methylene chloride three times. The extracts were dried, filtered and concentrated
to provide 28 mg of product as a light yellow solid. LC-MS calculated for C
20H
26F
3N
3O: (M+H) 382; found 382.1.
Step D
N-((1R,3S)-3-Isopropyl-3-{[5-(trifluoromethyl)-3',6'-dihydro-3,4'-bipyridin-1'(2'H)-yl]carbonyl)cyclopentyl)-3-methyltetrahydro-2H-pyran-4-amine
[0314] To a solution of (1R,3S)-3-isopropyl-3-{[5-(trifluoromethyl)-3',6'-dihydro-3,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentanamine
(9.0 mg, 0.024 mmol), 3-methyltetrahydro-4H-pyran-4-one (8.1 mg, 0.071 mmol) and triethylamine
(0.0066 mL, 0.047 mmol) in dry methylene chloride (2.0 mL) was added sodium triacetoxyborohydride
(15.0 mg, 0.071 mmol). After being stirred at room temperature overnight, the reaction
was quenched with aqueous NaHCO
3 and diluted with methylene chloride. The organic layer was separated and the aqueous
layer was extracted with methylene chloride three times. The organic layers were combined,
dried over MgSO
4, filtered and evaporated under reduced pressure. The crude product was purified by
silica gel column (30:70 MeOH/EtOAc) to provide pure product. MS calculated for C
26H
36F
3N
3O
2: (M+H) 480; found 480.1.
Example 24
Preparation of 3-ethyl-N-((1R,3S)-3-isopropyl-3-{[5-(trifluoromethyl)-3',6'-dihydro-3,4'-bipyridin-1'(2'H)-yl]carbonyl}cyclopentyl)tetrahydro-2H-pyran-4-amine
[0315]

[0316] The title compound was prepared using a sequence analogous to that described for
Example 23. MS calculated for C
27H
38F
3N
3O
2: (M+H) 494; found 494.2.
Example 25
Preparation of N-[(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0317]

Step A
[0318]

2-Piperazin-1-yl-4-(trifluoromethyl)pyrimidine
[0319] A solution of 2-chloro-4-(trifluoromethyl)pyrimidine (2.0 g, 11 mmol), piperazine
(2.8 g, 33 mmol) and triethylamine (3.0 mL, 22 mmol) in DMF (10 mL) was stirred at
100 °C in a sealed tube overnight. After removal of most of the solvent, the residue
was purified by column chromatography on silica gel (EtOAc to EtOAc/MeOH/NEt
3 9/1/0.5) to give 1.48 g (56%) of desired product. MS calculated for C
9H
11F
3N
4: (M+H) 233; found 233.1.
Step B
[0320]

tert-Butyl [(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]carbamate
[0321] To a solution of 2-piperazin-1-yl-4-(trifluoromethyl)pyrimidine (250 mg, 1.08 mmol),
(1S,3R)-3-[(tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (300
mg, 1.1 mmol) and triethylamine (0.45 mL, 3.2 mmol) in methylene chloride (10 mL)
was added benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (520
mg, 1.2 mmol). After being stirred overnight, the reaction was quenched with saturated
NaHCO
3. The resulting solution was extracted with EtOAc three times. The combined organic
layers were dried (MgSO
4) and concentrated. Purification by column chromatography on silica gel (20%-40% EtOAc/hexanes)
provided 290 mg of desired product. MS calculated for C
23H
34F
3N
5O
3: (M+H) 486; found 386.1 (M-Boc+1).
Step C
[0322]

(1R,3S)-3-Isopropyl-3-({4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-yl}carbonyl)cyclopentanamine
[0323] tert-Butyl [(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]carbamate
(290 mg, 0.60 mmol) was dissolved in a 4.0 M solution of HCl in 1,4-dioxane (10 mL).
After being stirred at room temperature for 1 h, the mixture was concentrated to give
270 mg of desired product. MS calculated for C
18H
26F
3N
5O: (M+H) 386; found 386.1.
Step D
[0324]

N-[(1R,3S)-3-Isopropyl-3-({4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0325] To a solution of (1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-yl}carbonyl)cyclopentanainine
dihydrochloride (135.0 mg, 0.29 mmol), 3-methyltetrahydro-4H-pyran-4-one (100 mg,
0.88 mmol) and triethylamine (0.16 mL, 1.2 mmol) in methylene chloride (10 mL) was
added sodium triacetoxyborohydride (190 mg, 0.88 mmol). After being stirred at room
temperature overnight, the reaction was quenched with saturated NaHCO
3. The resulting solution was extracted with EtOAc three times. The combined organic
layers were dried (MgSO
4), concentrated. The residue was purified by flash chromatography on silica gel (EtOAc
to EtOAc/Et
3N=10:0.1) to give desired product as a mixture of two isomers. The two isomers were
separated by chiral HPLC to give isomer 1 and isomer 2. MS calculated for C
24H
36F
3N
5O
2: (M+H) 484; found 484.1.
Example 26
Preparation of 3-ethyl-N-[(1R,3S)-3-isopropyl-3-({4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-yl}carbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0326]

[0327] The title compound was prepared using a sequence analogous to that described for
Example 25. MS calculated for C
25H
38F
3N
5O
2: (M+H) 498; found 498.1.
Example 27
Preparation of N-[(1R,3S)-3-isopropyl-3-(4-[6-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0328]

Step A
[0329]

1-[6-(Trifluoromethyl)pyridin-2-yl]piperazine
[0330] A solution of 2-chloro-6-(trifluoromethyl)pyridine (1.0 g, 5.5 mmol), piperazine
(1.4 g, 16.0 mmol), and triethylamine (1.5 mL, 11.0 mmol) were mixed in DMF (10 mL)
in a dealed tube. The mixture was heated at 100 °C overnight. The reaction mixture
was concentrated and chromatographed on silica gel (ethyl acetate to EA/MeOH/Et
3N=9:1:0.5) to give 1.05 g of the desired product. MS calculated for C
10H
12F
3N
3: (M+H) 232.1; found 232.1.
Step B
[0331]

tert-Butyl [(1R,3S)-3-isopropyl-3-(4-[6-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
[0332] To a solution of 1-[6-(trifluoromethyl)pyridin-2-yl]piperazine (249 mg, 1.08 mmol),
(1S,3R)-3-[(
tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (300 mg, 1.10 mmol),
triethylamine (0.45 mL, 3.2 mmol) in methylene chloride (10 mL) was added benzotriazol-1-yloxytris(dimethylamino)phosphonium
hexafluorophosphate (524 mg, 1.18 mmol). After being stirred overnight, the reaction
was quenched with saturated sodium NaHCO
3. The resulting solution was extracted with EtOAc three times. The combined organic
layers were dried (MgSO
4) and concentrated. Purification by column chromatography on silica gel (20% EA/hex
to 40%EA/hexanes) provided 310 mg of the desired product. MS calculated for C
24H
36F
3N
4O
3: (M+H) 485.3; found 485.3.
Step C
[0333]

(1R,3S)-3Iisopropyl-3-(4-[6-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
dihydrochloride
[0334] tert-Butyl [(1R,3S)-3-isopropyl-3-(4-[6-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
(300 mg, 0.62 mmol) was dissoved in a 4.0 M solution of HCl in 1,4-dioxane (10 mL).
After being stirred at room temperature for 1 h, the solution was concentrated to
give 260 mg of desired product. MS calculated for C
19H
27F
3N
4O: (M+H) 385.2; found 385.2.
Step D
[0335]

N-[(1R,3S)-3-Isopropyl-3-(4-[6-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0336] To a solution of (1R,3S)-3-isopropyl-3-(4-[6-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
dihydrochloride (120 mg, 0.26 mmol), 3-methyltetrahydro-4H-pyran-4-one (75 mg, 0.66
mmol), triethylamine (0.15 mL, 1.0 mmol) in methylene chloride (8 mL) was added sodium
triacetoxyborohydride (0.17 g, 0.79 mmol). After being stirred at room temperature
overnight, the reaction mixture was diluted with water and extracted with ethyl acetate
three times, dried with sodium sulfate, filtered, and concentrated
in vacuo. The crude residue was purified by flash column chromatography (ethyl acetate to EtOAc/Et
3N=10:0.1) to yield the desired product (100 mg, 79%). LCMS calculated for C
25H
38F
3N
4O
2: (M+1) 483.2; found 483.2.
Example 28
Preparation of N-[(1R,3S)-3-isopropyl-3-(4-[6-(trifluoromethyl)pyrimidin-4-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0337]

Step A
[0338]

4-Chloro-6-(trifluoromethyl)pyrimidine
[0339] A solution of 6-(trifluoromethyl)pyrimidin-4-ol (5.0 g, 30.5 mmol), phosphoryl chloride
(3.41 mL, 36.6 mmol), and quinoline (2.16 mL, 18.3 mmol) in toluene (50 mL) was stirred
at 100 °C for 5 h. The reaction was diluted with water and extracted with ethyl acetate
three times, dried with sodium sulfate, filtered, and concentrated
in vacuo. The crude residue was purified by flash column chromatography (10% EtOAc/Hexane)
to yield the desired product (1.20 g, 21.6%).
1H NMR (400 MHz, CDCl3): 9.21 ppm (1H, s), 7.78 (1H, s).
Step B
[0340]

4-Piperazin-1-yl-6-(trifluoromethyl)pyrimidine
[0341] A solution of 4-chloro-6-(trifluoromethyl)pyrimidine (1.0 g, 5.48 mmol), piperazine
(2.36 g, 27.4 mmol), and triethylamine (2.29 mL, 16.4 mmol) in DMF (20 mL) was stirred
at 100 °C for 5 h. The reaction solution was diluted with water and extracted with
ethyl acetate three times, dried with sodium sulfate, filtered, and concentrated
in vacuo. The crude residue was purified by flash column chromatography (10%MeOH/5%Et
3N/EtOAc) to yield the desired product (720 mg, 56.6%). LCMS calculated for C
9H
12F
3N
4: (M+1) 233.1; found 233.1.
Step C
[0342]

tert-Butyl [(1R,3S)-3-Isopropyl-3-(4-[6-(trifluoromethyl)pyrimidin-4-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
[0343] A solution of 4-piperazin-1-yl-6-(trifluoromethyl)pyrimidine (1.0 g, 4.31 mmol),
(1
S,3
R)-3-[(
tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic acid (1.75 g, 6.46 mmol),
benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (2.86 g, 6.46
mmol), and triethylamine (1.20 mL, 8.61 mmol) in methylene chloride (10 mL) was stirred
at room temperature overnight. The reaction mixture was diluted with methylene chloride,
washed with brine, dried with sodium sulfate, filtered, and concentrated in vacuo.
The crude residue was purified by flash column chromatography to yield the desired
product (800 mg, 38.3%). LCMS calculated for C
23H
35F
3N
5O
3: (M+1) 486.2; found 486.2.
Step D
[0344]

[0345] A solution of tert-butyl [(1R,3S)-3-isopropyl-3-(4-[6-(trifluoromethyl)pyrimidin-4-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
(800 mg, 1.65 mmol) dissolved in 4 M of HCl in 1,4-dioxane (10 mL, 40 mmol) was stirred
at room temperature for 2 h. The reaction mixture was diluted with methylene chloride,
washed with saturated NaHCO
3 solution, dried with sodium sulfate, filtered, and
concentrated in vacuo. The crude residue was purified by flash column chromatography to yield the desired
product (0.6 g, 99%). LCMS calculated for C
18H
27F
3N
5O: (M+1) 386.2; found 386.2.
Step E
[0346]

N-[(1R,3S)-3Iisopropyl-3-(4-[6-(trifluoromethyl)pyrimidin-4-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0347] To a solution of (1R,3S)-3-isopropyl-3-(4-[6-(trifluoromethyl)pyrimidin-4-yl]piperazin-1-ylcarbonyl)cyclopentanamine
(120 mg, 0.30 mmol), 3-methyltetrahydro-4H-pyran-4-one (120 mg, 0.90 mmol), and triethylamine
(0.12 mL, 0.90 mmol) in methylene chloride (20 mL) was added sodium triacetoxyborohydride
(0.19 g, 0.90 mmol). After being stirred at room temperature overnight, the reaction
mixture was diluted with methylene chloride, washed with brine, dried over sodium
sulfate, filtered and concentrated. The residue was purified by flash chromatography
to provide the desired product as a mixture of four isomers. LCMS calculated for C
24H
36F
3N
5O
2: (M+1) 484.2; found 484.2 for four isomers.
Example 29
Preparation of N-[(1R,3S)-3-isopropyl-3-(4-[6-methyl-4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0348]

Step A
[0349]

1-[6-Methyl-4-(trifluoromethyl)pyridin- 2-yl]piperazine
[0350] A solution of 2-chloro-6-methyl-4-(trifluoromethyl)pyridine (1.0 g, 5.11 mmol), piperazine
(1.32 g, 15.3 mmol), and triethylamine (0.71 mL, 5.1 mmol) were mixed in 1,4-dioxane
(10 mL). After stirring at 100 °C for 5 h, the reaction solution was diluted with
water and extracted with ethyl acetate three times, dried with sodium sulfate, filtered,
and concentrated
in vacuo. The crude residue was purified by flash column chromatography (10%MeOH/5%Et
3N/EtOAc) to yield the desired product (880 mg, 70.2%). LCMS calculated for C
11H
15F
3N
3: (M+1) 246.1; found 246.1.
Step B
[0351]

tert-Butyl [(1R,3S)-3-Isopropyl-3-(4-[6-methyl-4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
[0352] To a sulotion of 1-[6-methyl-4-(trifluoromethyl)pyridin-2-yl]piperazine (280 mg,
1.1 mmol), (1S,3R)-3-[(tert-butoxycarbonyl)amino]-1-isopropylcyclopentanecarboxylic
acid (460 mg, 1.7 mmol) in methylene chloride (30 mL) was added benzotriazol-1-yloxytris(dimethylamino)phosphonium
hexafluorophosphate (0.60 g, 1.4 mmol), and triethylamine (0.20 g, 2.0 mmol). After
being stirred overnight, the reaction mixture was diluted with methylene chloride,
washed with brine, dried over sodium sulfate, filtered and concentrated. The crude
residue was purified by flash column chromatography to provide the desired product
(200 mg, 35.1%). LCMS calculated for C
25H
37F
3N
4O
3: (M+1) 499.3; found 499.2.
Step C
[0353]

(1R,3S)-3-Isopropyl-3-(4-[6-methyl-4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
[0354] A solution of tert-butyl [(1R,3S)- 3-isopropyl-3-(4-[6-methyl-4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
(200 mg, 1.65 mmol) dissolved in 4 M of HCl in 1,4-dioxane (10 mL, 40 mmol) was stirred
at room temperature for 1 h. The reaction was diluted with methylene chloride, washed
with saturated NaHCO
3 solution, dried with sodium sulfate, filtered, and concentrated
in vacuo to provide the desired product (0.15 g, 94%). LCMS calculated for C
20H
30F
3N
4O: (M+1) 399.2; found 399.2.
Step D
[0355]

N-[(1R,3S)-3-Isopropyl-3-(4-[6-methyl-4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0356] To a solution of (1
R,3
S)-3-isopropyl-3-(4-[6-methyl-4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
(120 mg, 0.30 mmol), 3-methyltetrahydro-4H-pyran-4-one (100mg, 0.90 mmol), and triethylamine
(0.12 mL, 0.90 mmol) in methylene chloride (20 mL) was added sodium triacetoxyborohydride
(0.19 g, 0.90 mmol). After being stirred at room temperature overnight, the reaction
mixture was diluted with methylene chloride, washed with brine, dried over sodium
sulfate, filtered and concentrated. The residue was purified by flash chromatography
to provide the desired product as a mixture of four isomers. LCMS calculated for C
26H
39F
3N
4O
2: (M+1) 497.3; found 497.2 for four isomers.
Example 30
Preparation of N-[(1R,3S)-3-isopropyl-3-(4-[3-(trifluoromethyl)phenyl]piperidin-1-ylcarbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0357]

[0358] To a solution of N-((1R,3S)-3-isopropyl-3-[4-[3-(trifluoromethyl)phenyl]-3,6-dihydropyridin-1(2H)-yl]carbonylcyclopentyl)tetrahydro-2H-pyran-4-amine
(12.0 mg, 0.026 mmol) in methanol (1.0 mL) under N
2 was added palladium (5.5 mg) (10% dry weight on wet activated carbon). The reaction
mixture was stirred at room temperature under H
2 (1 atm) overnight (22 h) and filtered through celite. The celite was washed with
methylene chloride and the filtrate was concentrated to give the desired product (11.9
mg, 99%). MS calculated for C
26H
38F
3N
2O
2: (M+H) 467.3; found 467.2.
Example 31
Preparation of N-[(1R,3S)-3-isopropyl-3-(4-[3-(trifluoromethyl)phenyl]piperidin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0359]

[0360] The title compound was prepared using procedures analogous to those described for
Example 30. MS calculated for C
27H
39F
3N
2O
2: (M+H) 481.3; found 481.3.
Example 32
Preparation of 2-[(1R,3S)-3-[(3-methyltetrahydro-2H-pyran-4-yl)amino]-1-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]propan-2-ol
bis(trifluoroacetate)
[0361]

Step A
[0362]

Methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]-1-(1-hydroxy-1-methylethyl)cyclopent-2-ene-1-carboxylate
[0363] To a 1.00 M solution of lithium hexamethyldisilazide in tetrahydrofuran (45 mL) stirring
at -78 °C was added a solution of methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]cyclopent-2-ene-1-carboxylate
(5.0 g, 21 mmol) in tetrahydrofuran (40 mL). The resulting golden mixture was warmed
to -28 °C to -23 °C (CCl
4/dry ice) and stirred for 30 min. The reaction solution was cooled down to -78 °C
and anhydrous acetone (1.8 mL, 25 mmol) was added. After the addition, the reaction
mixture was kept in a CCl
4/dry ice bath and allowed to warm to room temperature overnight. The dark solution
was quenched with saturated NH
4Cl and extracted with ether three times. The combined extracts were dried, filtered,
concentrated. The crude residue was purified by flash column chromatography (EtOAc/Hexane)
to yield the desired product (1.4 g, 22.6%).
Step B
[0364]

Methyl (3S)-3-[(tert-Butoxycarbonyl)amino]-1-(1-hydroxy-1-methylethyl)cyclopentanecarboxylate
[0365] Methyl (4S)-4-[(tert-butoxycarbonyl)amino]-1-(1-hydroxy-1-methylethyl)cyclopent-2-ene-1-carboxylate
(1.4 g, 4.7 mmol) was dissolved in ethanol (30 mL) in a Parr flask and purged with
N
2. 10% Palladium on carbon (0.14 g) was added and the mixture was shaken overnight
under nitrogen at 50 psi. The mixture was filtered through celite, washed with methylene
chloride and concentrated to give the desired product (1.06g, 86%).
Step C
[0366]

(3S)-3-[(tert-Butoxycarbonyl)amino]-1-(1-hydroxy-1-methylethyl)cyclopentanecarboxylic
acid
[0367] To a solution of methyl (3S)-3-[(tert-butoxycarbonyl)amino]-1-(1-hydroxy-1-methylethyl)cyclopentanecarboxylate
(1.0 g, 3.3 mmol) in a mixture of tetrahydrofuran (30 mL), methanol (30 mL) and water
(6 mL) was added Lithium hydroxide monohydrate (0.22 g, 5.3 mmol) and the mixture
refluxed overnight (110 °C). The organic solvents were evaporated and the aqueous
layer was washed with ether one time. The aqueous layer was then acidified with 6
N HCl to about pH 4 and extracted with methylene chloride three times. The combined
extracts were dried, filtered, and concentrated to provide the desired product (0.47
g, 49%).
Step D
[0368]

tert-Butyl [3-(1-Hydroxy-1-methylethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
[0369] To a suspension of (3S)-3-[(tert-butoxycarbonyl)amino]-1-(1-hydroxy-1-methylethyl)cyclopentanecarboxylic
acid (150 mg, 0. 52 mmol) and 1-[4-(trifluoromethyl)pyridin-2-yl]piperazine (130 mg,
0.57 mmol) in methylene chloride (3 mL) under N
2 was added triethylamine (0.16 g, 1.6 mol) and benzotriazol-1-yloxytris(dimethylamino)phosphonium
hexafluorophosphate (0.25 g, 0.57 mmol). After being stirred at room temperature overnight,
the reaction was quenched by saturated NaHCO
3 solution and extracted with methylene chloride three times. The combined extracts
were dried (MgSO
4), filtered, concentrated and purified by flash column chromatography to yield the
desired product (76 mg, 29%).
Step E
[0370]

2-[(1R,3S)-3-Amino-1-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]propan-2-ol
dihydrochloride
[0371] tert-Butyl [(3R)-3-(1-hydroxy-1-methylethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
(75 mg, 0.15 mmol) was mixed with a 2.00 M solution of hydrogen chloride in ether
(2 mL) and tetrahydrofuran (1 mL). After being stirred for 1 h at room temperature,
the reaction solution was concentrated to provide the desired product (70 mg, 98.7%).
LCMS calculated for C
17H
28F
3N
4O
2: (M+H) 473.2; found 473.2.
Step F
[0372]

2-[(1R, 3S)-3-[(3-Methyltetrahydro-2H-pyran-4-yl)amino]-1-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]propan-2-ol
bis(trifluoroacetate) (salt)
[0373] To a solution of 2-[(1R,3S)-3-amino-1-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]propan-2-ol
dihydrochloride (80 mg, 0.16 mmol), 3-methyltetrahydro-4H-pyran-4-one (54 mg, 0.47
mmol), and triethylamine (88 uL, 0.63 mmol) in methylene chloride (6 mL) was added
sodium triacetoxyborohydride (99.8 mg, 0.47 mmol). After being stirred at room temperature
overnight, the reaction was quenched with saturated NaHCO
3 and extracted with methylene chloride three times. The combined extracts were dried
(MgSO
4), filtered, concentrated, purified by chromatography and then converted to the desired
product TFA salts (33.6 mg, 29%). LCMS calculated for C
25H
37F
3N
4O
3: (M+H) 499.3; found 499.3.
Example 33
Preparation of 2-[(1S,3R)-3-[(4R)-3-methyltetrahydro-2H-pyran-4-yl]amino-1-(4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]propan-2-ol
bis(trifluoroacetate)
[0374]

[0375] The title compound was prepared using procedures analogouss to those described for
Example 32. MS calculated for C
24H
36F
3N
5O
3: (M+H) 500.3; found 500.3.
Example 34
2-[(1S,3S)-3-[(3-methyltetrahydro-2H-pyran-4-yl)amino]-1-(4-[6-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]propan-2-ol
bis(trifluoroacetate)(salt)
[0376]

[0377] The title compound was prepared using procedures analogs to those described for Example
32. MS calculated for C
25H
37F
3N
4O
3: (M+H) 499.3; found 499.3
Example 35
Preparation of N-[(1S,3S)-3-ethyl-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0378]

Step A
[0379]

Methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]-1-ethylcyclopent-2-ene-1-carboxylate
[0380] To a 1.00 M soluition of lithium hexamethyldisilazide in tetrahydrofuran (61.5 mL,
61.5 mmol) was added a solution of methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]cyclopent-2-ene-1-carboxylate
(6.71 g, 27.8 mmol) in tetrahydrofuran (10.0 mL) at -78 °C over 10 min. The resulted
light brown solution was stirred at -78 °C for 30 min before iodoethane (2.67 mL,
33.4 mmol) was added in one portion. The mixture was then kept at -25 °C overnight.
The reaction was quenched with aqueous NH
4Cl. The organic layer was separated and the aqueous layer was further extracted with
ether three times. The combined organic layers were then washed with brine, dried
over Na
2SO
4, filtered, concentrated and purified by flash column chromatography to yield the
desired product as a 7:1 cis/trans mixture (4.83g, 65%). MS calculated for C
14H
23NO
4: (M+H) 170.2; found 170.1 (M+H-Boc).
Step B
[0381]

(1R,4S)-4-[(tert-Butoxycarbonyl)amino]-1-ethylcyclopent-2-ene-1-carboxylic Acid
[0382] To a solution of methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]-1-ethylcyclopent-2-ene-1-carboxylate
(4.80 g, 17.8 mmol)) in a mixture of tetrahydrofuran (100 mL), methanol (100 mL) and
water (20 mL) was added lithium hydroxide monohydrate (1.2 g, 28.6 mmol) and the mixture
was refluxed overnight. The organic solvents were evaporated. The aqueous layer was
then acidified with 6 N HCl to about pH 4 and extracted with methylene chloride three
times. The combined extracts were dried, filtered, and concentrated to give a mixture
of cis/trans isomers (2.93 g, cis/trans = 7:1) as a light yellow solid. This solid
was dissolved in EtOAc (4.0 mL) with heating and diluted with hexanes (100 mL) to
give a clear solution. This solution was allowed to cool to room temperature slowly
over 1 h and then maintained at -25 °C overnight. The
cis-isomer was crystallized and dried to provide the desired product (1.40 g, 31%) as
a white solid. MS calculated for C
13H
21NO
4: (M+H) 256.2.2; found 156.1 (M+H-Boc).
Step C
[0383]

(1S,3R)-3-[(tert-Butoxycarbonyl)amino]-1-ethylcyclopentanecarboxylic Acid
[0384] To a solution of (1R,4S)-4-[(tert-butoxycarbonyl)amino]-1-ethylcyclopent-2-ene-1-carboxylic
acid (1.38 g, 5.41 mmol) in ethanol (40 mL) was added 10% palladium on carbon (200
mg). The mixture was shaken under hydrogen at 50 psi for 18 h and filtered through
celite. The filtrate was evaporated
in vacuo to afford the desired product (1.5 g). MS calculated for C
13H
23NO
4: (M+H) 258.2; found 158.1 (M+H-Boc).
Step D
[0385]

tert-Butyl [(1S,3R)-3-Ethyl-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
[0386] To a solution of (1R,3S)-3-[(tert-butoxycarbonyl)amino]-1-ethylcyclopentanecarboxylic
acid (0.30 g, 1.2 mmol) and 1-[4-(trifluoromethyl)pyridin-2-yl]piperazine dihydrochloride
(0.39 g, 1.3 mmol) in DMF (10 mL) under N
2 was added triethylamine (0.65 mL, 4.7 mmol) and O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium
hexafluorophosphate (0.663 g, 1.75 mmol). After being stirred at room temperature
overnight, the reaction was quenched with saturated NaHCO
3 and extracted with methylene chloride three times. The combined extracts were dried
(MgSO
4), filtered, concentrated and purified by flash column chromatography to yield the
desired product (400 mg, 72.9%). MS calculated for C
23H
34F
3N
4O
3: (M+H) 471.3; found 371.2 (M+H-Boc).
Step E
[0387]

(1S,3R)-3-Ethyl-3-(4-(4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
dihydrochloride
[0388] tert-Butyl [(1S,3R)-3-ethyl-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
(0.39 g, 0. 83 mmol) was dissolved in a 4 M solution of hydrogen chloride in 1,4-dioxane
(3.1 mL) and the solution was stirred at room temperature overnight. The reaction
solution was evaporated to give the desird product as a yellow powder (0.36 g, 96%).
Step F
[0389]

N-[(1S,3S)-3-Ethyl-3-(4-[4-(trifluoromethyl)pyridine-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0390] To a solution of (1S,3S)-3-ethyl-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
dihydrochloride (100 mg, 0.20 mmol), 3-methyltetrahydro-4H-pyran-4-one (96 mg, 0.71
mmol), and triethylamine (0.11 mL, 0.79 mmol) in methylene chloride (3 mL) was added
sodium triacetoxyborohydride (96 mg, 0.45 mmol). After being stirred at room temperature
overnight, the reaction was quenched with saturated NaHCO
3 and extracted with methylene chloride three times. The combined organics were dried
(MgSO
4), filtered, concentrated, purified by flash column chromatography (NH
4OH/MeOH/EtOAc) to yield the desired product (38 mg, 40%). MS calculated for C
24H
35F
3N
4O
2: (M+H) 469.3; found 469.3.
Example 36
Preparation of (4R)-N-[(1R,3S)-3-ethyl-3-(4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0391]

[0392] The title compound was prepared using procedures analogous to those described for
Example 35. MS calculated for C
23H
34F
3N
5O
2: (M+H) 470.3; found 470.3.
Example 37
N-[(1S,3S)-3-ethyl-3-(4-[6-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0393]

[0394] The title compound was prepared using procedures analogous to those described for
Example 35. MS calculated for C
24H
35F
3N
4O
2: (M+H) 469.3; found 469.3.
Example 38
Preparation of (4R)-N-[(1R,3S)-3-methyl-3-(4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
bis(trifluoroacetate)
[0395]

[0396] The title compound was prepared using procedures analogous to those described for
Example 35. MS calculated for C
22H
32F
3N
5O
2: (M+H) 456.3; found 456.3.
Example 39
Preparation of (4R)-3-methyl-N-[(1R,3S)-3-(2-methoxyethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0397]

Step A
[0398]

1-Iodo-2-methoxyethane
[0399] To a solution of 1-bromo-2-methoxyethane (2.0 g, 14 mmol) in acetone (40 mL) was
added sodium iodide (11 g, 72 mmol) and the resulting solution was refluxed (70 °C)
under N
2 for 3 hours. The mixture was cooled and filtered. Upon further cooling in the refrigerator,
additional solids crashed out and were filtered off before concentrating to give an
orange residue. The residue was taken up in ether and washed with Na
2S
2O
3, which rendered a nearly colorless solution. The solution was dried (MgSO
4), filtered, and concentrated to give a yellow oil (1.8g, 64%).
1H NMR (CDCl
3) δ 3.70-3.60 (2H, t, J = 5 Hz), 3.40 (3H, s), 3.30-3.20 (2H, t, J = 5Hz).
Step B
[0400]

Methyl (1S,4S)-4-[(tert-Butoxycarbonyl)amino]-1-(2-methoxyethyl)cyclopent-2-ene-1-carboxylate
[0401] To a 1.00 M solution of lithium hexamethyldisilazide in tetrahydrofuran (9.1 mL,
9.1 mmmol) under N
2 at -78 °C was added a solution of methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]cyclopent-2-ene-1-carboxylate
(1.0 g, 4.1 mmol) in tetrahydrofuran (2.0 mL). The resulted light brown solution was
stirred at -78 °C for 30 min before adding a solution of 1-iodo-2-methoxyethane (0.93
g, 5.0 mmol) in tetrahydrofuran (2.0 mL). The mixture was stirred for an hour at -78
°C then kept in a freezer reading at -20 °C overnight. The reaction was quenched with
saturated ammonium chloride. The layers were separated and the aqueous extracted with
ether three times. The combined organics were then washed with brine, dried (magnesium
sulfate), filtered and purified by flash chromatography (EtOAc/Hexane) to provide
the desired product (0.28 g, 23%). LCMS calculated for C
15H
26NO
5: (M+H) 300.2; found 300.2.
Step C
[0402]

(1S,4S)-4-[(tert-Butoxycarbonyl)amino]-1-(2-methoxyethyl)cyclopent-2-ene-1-carboxylic
Acid
[0403] To a stirred solution of methyl (1S,4S)-4-[(tert-butoxycarbonyl)amino]-1-(2-methoxyethyl)cyclopent-2-ene-1-carboxylate
(0.78 g, 2.6 mmol) in tetrahydrofuran (1.5 mL), methanol (15 mL), and water (3.0 mL)
was added lithium hydroxide monohydrate (0.55 g, 13 mmol) and the resulting orange
mixture was stirred at 80 °C overnight. The solvents were evaporated and the mixture
was acidified with 6 N HCl to a pH of about 4. The aqueous was then extracted with
methylene chloride three times. The combined organic layers were dried (MgSO
4), filtered, and concentrated
in vacuo to give the desired product as an oil (0.47 g, 63.2%). LCMS calculated for C
14H
24NO
5: (M+H) 286.2; found 286.2.
Step D
[0404]

(1S,3R)-3-[(tert-Butoxycarbonyl)amino]-1-(2-methoxyethyl)cyclopentanecarboxylic Acid
[0405] To a solution of (1S,4S)-4-[(tert-butoxycarbonyl)amino]-1-(2-methoxyethyl)cyclopent-2-ene-1-carboxylic
acid (1.56 g, 5.47 mmol) in methanol (30 mL) was added 10% palladium on carbon (150
mg). The mixture was shaken under hydrogen at 50 psi overnight and filtered through
celite. The filtrate was evaporated in vacuo to afford the desired product (1.57g,
99.9%). MS calculated for C
14H
26NO
5 (M+H) 288.2; found 188.2 (M+H-Boc).
Step E
[0406]

tert-Butyl [(1R,3S)-3-(2-methoxyethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
[0407] (1S,3R)-3-[(tert-Butoxycarbonyl)amino]-1-(2-methoxyethyl)cyclopentanecarboxylic acid
(276.6 mg, 0.96 mmol), 1-[4-(trifluoromethyl)pyridin-2-yl]piperazine dihydrochloride
(322.0 mg, 1.06 mmol), triethylamine (0.54 mL, 3.85 mmol) and O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium
hexafluorophosphate (547.6 mg, 1.44 mmol) (HBTU) were mixed in dry DMF (6.6 mL) and
the resultanting brown solution was stirred at room temperature under N
2 for three days. The reaction mixture was diluted with CH
2Cl
2, and washed with saturated Na
2CO
3. The aqueous layer was extracted with CH
2Cl
2 four times. The combined organic layers were dried (MgSO
4), filtered, concentrated and purified by flash chromatography (EtOAc/Hexane) to provide
the desired product (252 mg, 52%). MS calculated for C
24H
36F
3N
4O
4 (M+H) 501.3; found 401.3 (M+H-Boc).
Step F
[0408]

(1R,3S)-3-(2-Methoxyethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
dihydrochloride
[0409] tert-Butyl [(1R,3S)-3-(2-methoxyethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
(252 mg, 0.503 mmol) was dissolved in a 2 M solution of hydrogen chloride in ether
(8 mL) and stirred at room temperature for 2 h. The reaction solution was concentrated
to give the desird product as a yellow powder (0.36 g, 96%). MS calculated for C
19H
27F
3N
4O
2 (M+H) 401.3; found 401.3.
Step G
[0410]

(4R)-3-Methyl-N-[(1R,3S)-3-(2-methoxyethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0411] To a solution of (1R,3S)-3-(2-methoxyethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
dihydrochloride (130.0 mg, 0.275 mmol), 3-meyltetrahydro-4H-pyran-4-one (94 mg, 0.824
mmol) and triethylamine (0.153 mL, 1.10 mmol) in dry methylene chloride (12 mL) was
addedd sodium triacetoxyborohydride (174.6 mg, 0.824 mmol). After being stirred under
N
2 at room temperature overnight, the reaction was quenched with saturated NaHCO
3 and extracted with methylene chloride three times. The combined organics were dried
(MgSO
4), filtered, concentrated, purified by flash column chromatography (MeOH/EtOAc) to
yield the desired product (52 mg, 38%). MS calculated for C
25H
37F
3N
4O
3: (M+H) 499.3; found 499.4.
Example 40
Preparation of 3-methyl-N-[(1S,3S)-3-(2-methoxyethyl)-3-(4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-ylcarbonyl)cyclopentylltetrahydro-2H-pyran-4-amine
[0412]

[0413] The title compound was prepared using procedures analogous to those described for
Example 27. MS calculated for C
24H
36F
3N
5O
3: (M+H) 500.3; found 500.3.
Example 41
Preparation of (4R)-N-[(1R,3S)-3-(ethoxymethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0414]

Step A
[0415]

Methyl (1R,4S)-4-[(tert-Butoxycarbonyl)amino]-1-(ethoxymethyl)cyclopent-2-ene-1-carboxylate
[0416] To a 1.0 M solution of lithium hexamethyldisilazide in tetrahydrofuran (36.7 mL,
36.7 mmmol) was added a solution of methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]cyclopent-2-ene-1-carboxylate
(4.00 g, 1.66 mmol) in tetrahydrofuran (6.0 mL) at -78 °C. The resulting light brown
solution was stirred at -78 °C for 30 min before (chloromethoxy)ethane (1.88 g, 19.9
mol) was added in one portion. The mixture was stirred at -78 °C for 1 h and then
kept in a freezer reading at -25 °C overnight. The reaction was then quenched with
saturated NH
4Cl (50 mL). The organic layer was separated and the aqueous layer was extracted with
CH
2Cl
2 three times. The combined organic layers were washed with brine, dried over Na
2SO
4, filtered, concentrated, and purified by flash chromatography (0 to 15% EtOAC in
hexanes) to provide the desired product (3.29 g, 66%) as a cis/trans (3:2) mixture
based on the analysis on reverse phase HPLC. MS calculated for C
15H
26NO
5: (M+H) 300.2; found 200.2 (M+H-Boc).
Step B
[0417]

(1R,4S)-4-[(tert-Butoxycarbonyl)amino]-1-(ethoxymethyl)cyclopent-2-ene-1-carboxylic
acid
[0418] To a solution of methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]-1-(ethoxymethyl)cyclopent-2-ene-1-carboxylate
(3.25 g, 10.8 mmol) in tetrahydrofuran (58.7 mL), methanol (58.7 mL) and water (12.6
mL) was added lithium hydroxide monohydrate (0.731 g, 17.42 mmol). The pink mixture
was heated to reflux overnight. The organic solvents were removed in vacuo and the
aqueous layer was washed once with ether and then acidified slowly with concentrated
HCl until the pH reached 4. The resulting suspension was extracted with methylene
chloride three times. The combined organic layers were dried over MgSO
4, filtered and concentrated to give the desired product as a mixture of two cis/trans
isomers (2.75 g, 89%). MS calculated for C
14H
24NO
5: (M+H) 286.2; found 186.2 (M+H-Boc).
Step C
[0419]

(1S,3R)-3-[(tert-Butoxycarbonyl)amino]-1-(ethoxymethyl)cyclopentanecarboxylic acid
[0420] To a solution of (1R,4S)-4-[(tert-butoxycarbonyl)amino]-1-(ethoxymethyl)cyclopent-2-ene-1-carboxylic
acid (2.70 g, 9.46 mmol) in ethanol (69.5 mL) was added 10% palladium on carbon (350
mg). The mixture was shaken under hydrogen at 50 psi for 18 h, filtered through celite
and washed with methylene chloride. The filtrate was concentrated to afford the desired
product (2.87 g). MS calculated for C
14H
26NO
5 (M+H) 288.2; found 188.2 (M+H-Boc).
Step D
[0421]

tert-Butyl [(3S)-3-(ethoxymethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
[0422] (1S)-3-[(tert-Butoxycarbonyl)amino]-1-(ethoxymethyl)cyclopentanecarboxylic acid (429.4
mg, 1.494 mmol), 1-[4-(trifluoromethyl)pyridin-2-yl]piperazine dihydrochloride (500.0
mg, 1.644 mmol), triethylamine (0.833 mL, 5.98 mmol) and O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium
hexafluorophosphate (850.3 mg, 2.242 mol) (HBTU) were mixed in dry DMF (10.2 mL).
The resulting brown solution was stirred at room temperature under N
2 overnight. The reaction mixture was diluted with CH
2Cl
2 and washed with saturated Na
2CO
3. The aqueous layer was extracted with CH
2Cl
2 four times. The combined organic layers were dried (MgSO
4), concentrated and purified by flash chromatography to provide the desired product
(304.4 mg, 40%). MS calculated for C
24H
36F
3N
4O
4: (M+H) 501.3; found 501.3.
Step E
[0423]

(1R,3S)-3-(Ethoxymethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
dihydrochloride
[0424] tert-Butyl [(3S)-3-(ethoxymethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
(295 mg, 0.589 mol) was dissolved in a 2 M solution of hydrogen chloride in ether
(10 mL). After being stirred at room temperature overnight, the reaction mixture was
concentrated under vacuum to provide the desired product (330 mg) as a light yellow
solid. MS calculated for C
19H
28F
3N
4O
2: (M+H) 401.3; found 401.3.
Step F
[0425]

(4R)-N-[(1R,3S)-3-(Ethoxymethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0426] To a solution of (1R,3S)-3-(ethoxymethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
dihydrochloride (100.0 mg, 0.211 mmol), 3-methyltetrahydro-4H-pyran-4-one (72.3 mg,
0.634 mmol) and triethylamine (0.118 mL, 0.845 mmol) in dry methylene chloride (5
mL) was added sodium triacetoxyborohydride (134.3 mg, 0.634 mmol). After being stirred
at room temperature under N
2 overnight, the reaction was quenched with aqueous NaHCO
3 and diluted with methylene chloride. The organic layer was separated and the aqueous
layer was extracted with methylene chloride three times. The organics were combined,
dried over MgSO
4, filtered, purified by silica gel Combi-Flash system (gradient, 0 to 40% MeOH in
EtOAc, 12 gram column) to give the desired product (34 mg, 34%). MS calculated for
C
25H
37F
3N
4O
3: (M+H) 499.3; found 499.3.
Example 42
Preparation of (4R)-N-[(1R,3S)-3-(ethoxymethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-ethyltetrahydro-2H-pyran-4-amine
[0427]

[0428] The title compound was prepared using procedures analogous to those described for
Example 41. MS calculated for C
26H
39F
3N
5O
3: (M+H) 513.3; found 513.3.
Example 43
Preparation of (4R)-N-[(1R,3S)-3-(ethoxymethyl)-3-(4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]-3-methyltetrahydro-2H-pyran-4-amine
[0429]

[0430] The title compound was prepared using procedures analogous to those described for
Example 41. MS calculated for C
24H
36F
3N
5O
3: (M+H) 500.3; found 500.3.
Example 44
Preparation of (4R)-3-methyl-N-[(1R,3S)-3-(methoxymethyl)-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0431]

[0432] The title compound was prepared using procedures analogous to those described for
Example 41. MS calculated for C
24H
35F
3N
4O
3: (M+H) 485.3; found 485.3.
Example 45
Preparation of (4R)-3-methyl-N-[(1R,3S)-3-(methoxymethyl)-3-(4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0433]

[0434] The title compound was prepared using procedures analogs to those described for Example
41. MS calculated for C
23H
34F
3N
5O
3: (M+H) 586.3; found 586.3.
Example 46
Preparation of (4R)-3-methyl-N-[(1R,3S)-3-[(3R)-tetrahydrofuran-3-yl]-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0435]

Step A
[0436]

(3R)-3-Iodotetrahydrofuran
[0437] To a a solution of (S)-(+)-3-hydroxytetrahydrofuran (0.50 g, 5.7 mmol) in methylene
chloride (50 mL) was added triphenylphosphine (3.0 g, 11 mmol), 1H-imidazole (0.75
g, 11 mmol), and iodine (2.9 g, 11 mmol) sequentially. After being refluxed under
N
2 overnight, the reaction was quenched with 0.2 M Na
2S
2O
3 (60 mL). The organic layer was separated and the aqueous layer was extracted with
methylene chloride three times. The combined organics were dried (MgSO
4), filtered, and concentrated to give a wet, yellow solid. To the solids was added
pentane (100 mL) and stirred for 2 hours. The solids were filtered off and the filtrate
was concentrated to give the desired product (970 mg, 79.4%) as yellow oil.
1H NMR (CDCl
3) δ 4.30-3.85 (5H, m), 2.50-2.20 (2H, m).
Step B
[0438]

Methyl (1R,4S)-4-[(tert-Butoxycarbonyl)amino]-1-[(3R)-tetrahydrofuran-3-yl]cyclopent-2-ene-1-carboxylate
[0439] To a 1.00 M solution of lithium hexamethyldisilazide in tetrahydrofuran (34.8 mL,
34.8 mmol) under N
2 at -78 °C was added a solution of methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]cyclopent-2-ene-1-carboxylate
(4.0 g, 16 mmol) in tetrahydrofuran (20 mL). The resulting brown solution was stirred
at -78 °C for 30 min before adding a solution of (3R)-3-iodotetrahydrofuran (3.75
g, 17.4 mmol) in THF (3 mL). The mixture was stirred for 10 min at -78 °C then kept
in a freezer reading at -25 °C overnight. The reaction was quenched with saturated
ammonium chloride, extracted with ether three times. The combined extracts were dried
(MgSO
4), filtered, concentrated and purified by flash column chromatography (EtOAc/Hexane)
to provide the desired product (1.6 g, 31%). MS calculated for C
16H
25NO
5: (M+H) 312.2; found 312.2.
Step C
[0440]

(1R,4S)-4-[(tert-Butoxycarbonyl)amino]-1-[(3R)-tetrahydrofuran-3-yl]cyclopent-2-ene-1-carboxylic
acid
[0441] To a solution of methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]-1-[(3R)-tetrahydrofuran-3-yl]cyclopent-2-ene-1-carboxylate
(1.60 g, 5.14 mmol) in tetrahydrofuran (27.8 mL), methanol (27.8 mL) and water (6.0
mL) was added lithium hydroxide monohydrate (0.346 g, 8.25 mmol). The pink mixture
was heated to reflux for 18 h. The organic solvents were removed in vacuo and the
aqueous layer was extracted once with ether and then acidified slowly with 6 M HCl
until the pH reached 3-4. The resulting suspension was extracted with CH
2Cl
2 three times. The combined organic layers were dried over MgSO
4, filtered and concentrated to give the product as a mixture of two cis/trans isomers
(1.59 g) as a light yellow solid. MS calculated for C
15H
24NO
5: (M+H) 298.2; found 198.2 (M+H-Boc).
Step D
[0442]

(1S,3R)-3-[(tert-Butoxycarbonyl)amino]-1-[(3 R)-tetrahydrofuran-3-yl]cyclopentanecarboxylic
acid
[0443] (1R,4S)-4-[(tert-Butoxycarbonyl)amino]-1-[(3R)-tetrahydrofuran-3-yl]cyclopent-2-ene-1-carboxylic
acid (0.79 g, 2.6 mol) was dissolved in ethanol (20.0 mL), degassed-purged with N
2, followed by the addition of platinum dioxide (0.150 g, 0.528 mol). The reaction
mixture was placed on a Parr apparatus and hydrogenated at 55 psi H
2 for 18 h. The mixture was filtered through celite pad, washed with MeOH, concentrated
to provide the desired product (730 mg, 91.8%). MS calculated for C
15H
26NO
5 (M+H) 300.2; found 200.2 (M+H-Boc).
Step E
[0444]

tert-Butyl [(1R,3S)-3-[(3R)-Tetrahydrofuran-3-yl]-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
[0445] (1S,3R)-3-[(tert-Butoxycarbonyl)amino]-1-[(3R)-tetrahydrofuran-3-yl]cyclopentanecarboxylic
acid (350.0 mg, 1.169 mmol), 1-[4-(trifluoromethyl)pyridin-2-yl]piperazine dihydrochloride
(391.1 mg, 1.286 mmol), triethylamine (0.652 mL, 4.68 mmol) and O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium
hexafluorophosphate (665.1 mg, 1.754 mol) (HBTU) were mixed in dry DMF (8.0 mL). After
being stirred at room temperature overnight, the reaction mixture was diluted with
CH
2Cl
2 and washed with saturated Na
2CO
3. The aqueous layer was extracted with CH
2Cl
2 four times. The combined organic layers were dried (MgSO
4), concentrated and purified by flash chromatography (Combi-flash system, 0-50% EtOAc
in hexanes, gradient elution, 40 gram column) to provide the desired product (270
mg, 45%). MS calculated for C
25H
36F
3N
4O
4 (M+H) 513.3; found 513.3.
Step F
[0446]

(1R,3S)-3-[(3R)-Tetrahydrofuran-3-yl]-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
Dihydrochloride
[0447] tert-Butyl [(1R,3S)-3-[(3R)-tetrahydrofuran-3-yl]-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate
(260 mg, 0.51 mmol) was dissolved in a 2 M solution of of hydrogen chloride in ether
(8 mL). After being stirred at room temperature overnight, the reaction mixture was
concentrated under vacuum to provide the desired product (290 mg) as a light yellow
solid. MS calculated for C
20H
27F
3N
4O
2: (M+H) 413.2; found 413.0.
Step G
[0448]

(4R)-3-Methyl-N-[(1R,3S)-3-[(3R)-tetrahydrofuran-3-yl]-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0449] To a solution of (1R,3S)-3-[(3R)-tetrahydrofuran-3-yl]-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentanamine
dihydrochloride (73.8 mg, 0.152 mmol), 3-methyltetrahydro-4H-pyran-4-one (52.1 mg,
0.456 mmol) and triethylamine (0.0848 mL, 0.608 mmol) in dry methylene chloride (4.1
mL) was added sodium triacetoxyborohydride (96.7 mg, 0.456 mmol). After being stirred
at room temperature under N
2, the reaction was quenched with aqueous NaHCO
3 and diluted with CH
2Cl
2. The organic layer was separated and the aqueous layer was extracted with CH
2Cl
2 three times. The organics were combined, dried over MgSO
4, filtered, concentrated and purified by silica gel chromatography (Combi-Flash system,
0 to 40% MeOH in EtOAc, gradient, 12 gram column) to provide the desired product (9.1
mg, 12%). MS calculated for C
26H
37F
3N
4O
3: (M+H) 511.3; found 511.3.
Example 47
Preparation of (4R)-3-methyl-N-[(1R,3S)-3-[(3R)-tetrahydrofuran-3-yl]-3-(4-[4-(trifluoromethyl)pyrimidin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]tetrahydro-2H-pyran-4-amine
[0450]

[0451] The title compound was prepared using procedures analogous to those described for
Example 46. MS calculated for C
25H
36F
3N
5O
3: (M+H) 512.3; found 512.3.
Example A
CCR2 in vitro assays
[0452] The capacity of the novel compounds of the invention to antagonize chemokine receptor
(e.g., CCR2) function can be determined using a suitable screen (e.g., high through-put
assay). For example, an agent can be tested in an extracellular acidification assay,
calcium flux assay, ligand binding assay or chemotaxis assay (see, for example,
Hesselgesser et al., J Biol. Chem. 273(25):15687-15692 (1998);
WO 00/05265 and
WO 98/02151).
[0453] In a suitable assay, a CCR2 protein which can be isolated or recombinantly derived
is used which has at least one property, activity or functional characteristic of
a mammalian CCR2 protein. The specific property can be a binding property (to, for
example, a ligand or inhibitor), a signalling activity (e.g., activation of a mammalian
G protein, induction of rapid and transient increase in the concentration of cytosolic
free calcium [Ca
++]i, cellular response function (e.g., stimulation of chemotaxis or inflammatory mediator
release by leukocytes), and the like.
[0454] In an example binding assay, a composition containing a CCR2 protein or variant thereof
is maintained under conditions suitable for binding. The CCR2 receptor is contacted
with a compound to be tested, and binding is detected or measured.
[0455] In an example cell-based assay, cells are used which are stably or transiently transfected
with a vector or expression cassette having a nucleic acid sequence which encodes
the CCR2 receptor. The cells are maintained under conditions appropriate for expression
of the receptor and are contacted with an agent under conditions appropriate for binding
to occur. Binding can be detected using standard techniques. For example, the extent
of binding can be determined relative to a suitable control. Also, a cellular fraction,
such as a membrane fraction, containing the receptor can be used in lieu of whole
cells.
[0456] Detection of binding or complex formation in an assay can be detected directly or
indirectly. For example, the agent can be labeled with a suitable label (e.g., fluorescent
label, label, isotope label, enzyme label, and the like) and binding can be determined
by detection of the label. Specific and/or competitive binding can be assessed by
competition or displacement studies, using unlabeled agent or a ligand as a competitor.
[0457] The CCR2 antagonist activity of compounds of the invention can be reported as the
inhibitor concentration required for 50% inhibition (IC
50 values) of specific binding in receptor binding assays using
125I-labeled MCP-1, as ligand, and Peripheral Blood Mononuclear Cells (PBMCs) prepared
from normal human whole blood via density gradient centrifugation. Specific binding
is preferably defined as the total binding (e.g., total cpm on filters) minus the
non-specific binding. Non-specific binding is defined as the amount of cpm still detected
in the presence of excess unlabeled competitor (e.g., MCP-1).
Example B
Binding Assay
[0458] Human PBMCs were used to test compounds of the invention in a binding assay. For
example, 200,000 to 500,000 cells were incubated with 0.1 to 0.2 nM
125I-labeled MCP-1, with or without unlabeled competitor (10 nM MCP-1) or various concentrations
of compounds to be tested.
125I-labeled MCP-1, were prepared by suitable methods or purchased from commercial vendors
(Perkin Elmer, Boston MA). The binding reactions were performed in 50 to 250 µL of
a binding buffer consisting of 1M HEPES pH 7.2, and 0.1% BSA (bovine serum albumin),
for 30 min at room temperature. The binding reactions were terminated by harvesting
the membranes by rapid filtration through glass fiber filters (Perkin Elmer) which
was presoaked in 0.3% polyethyleneimine or Phosphate Buffered Saline (PBS). The filters
were rinsed with approximately 600 µL of binding buffer containing 0.5 M NaCl or PBS,
then dried, and the amount of bound radioactivity was determined by counting on a
Gamma Counter (Perkin Elmer).
[0459] According to this binding assay protocol, the compounds of the present invention
have IC
50 values less than about 3000 nM.
Example C
Chemotaxis Assay
[0460] The capacity of compounds of the invention to antagonize CCR2 function was determined
in a leukocyte chemotaxis assay using human peripheral blood mononuclear cells, in
a modified Boyden Chamber (Neuro Probe). 500,000 cells in serum free DMEM media (In
Vitrogen) were incubated with or without the inhibitors and warmed to 37 °C. The chemotaxis
chamber (Neuro Probe) was also prewarmed. 400 µL of warmed 10 nM MCP-1 was added to
the bottom chamber in all wells except the negative control which had DMEM added.
An 8 micron membrane filter (Neuro Probe) was placed on top and the chamber lid was
closed. Cells were then added to the holes in the chamber lid which were associated
with the chamber wells below the filter membrane. The whole chamber was incubated
at 37 °C, 5% CO
2 for 30 minutes. The cells were then aspirated off, the chanber lid opened, and the
filter gently removed. The top of the filter was washed 3 times with PBS and the bottom
was left untouched. The filter was air dried and stained with Wright Geimsa stain
(Sigma). Filters were counted by microscopy. The negative control wells served as
background and were subtracted from all values. Antagonist potency was determined
by comparing the number of cell that migrated to the bottom chamber in wells which
contained antagonist, to the number of cells which migrated to the bottom chamber
in MCP-1 control wells.
[0461] According to this chemotaxis assay, the compounds of the invention have IC
50 values less than about 3000 nM.
[0462] Various modifications of the invention, in addition to those described herein, will
be apparent to those skilled in the art from the foregoing description. Such modifications
are also intended to fall within the scope of the appended claims.