Obesity is a chronic disease that has reached global epidemic proportions with over 1 billion adults being overweight (BMI 25 - 29.9) or obese (BMI >30). In the U.S.A. alone, the number of adults who are either overweight or obese is estimated to be over 150 million and is still on the rise. Currently marketed therapies (orlistat, sibutramine) have demonstrated sub-optimal efficacy (only 5-10% weight loss when used in combination with diet and exercise plans) and/or poor tolerability profiles. More recently, Sanofi Aventis' CB1 receptor antagonist, rimonabant, was withdrawn from the market due to adverse psychiatric side effects. The success of future obesity treatments will depend on their ability to elicit sustained and robust weight loss with improved safety/tolerability profiles.
Obesity (BMI > 30) is the long term consequence of an imbalance between energy intake and energy expenditure (Hill et al., 2000). Further, obesity is associated with decreased life span due to numerous co-morbidities that include coronary artery disease, hypertension, stroke, diabetes, hyperlipidemia, osteoarthritis and some cancers. Adiposity is a hallmark of obesity that results from the excessive deposition of the energy storage molecule triacylglycerol (TAG) in all tissues as well as an increase in overall adipose tissue mass due to increased adipocyte size and number. Increases in intracellular TAG and/or TAG precursors in non-adipocyte cell types, adipocyte invasion of non-adipose tissues, and increase in adipose mass are the causative factors of co-morbidities associated with obesity (Van Herpen et al., 2008). Recent studies suggest that the inhibition of diacylglycerol O-acyltransferase 1 (DGAT-1) may be an effective strategy to treat obesity and obesity associated co-morbidities (Chen et al., 2005; Shi et al., 2004).
DGATs are membrane-bound enzymes that catalyze the terminal step of TAG biosynthesis (Yen et al., 2008). Two enzymes, which catalyze the acylation of diacylglycerol (DAG) to form TAG, have been indentified and are designated DGAT-1 and DGAT-2. Importantly, the DGAT-1 and DGAT-2 enzymes have no significant protein sequence homology. In addition to catalyzing the acylation of DAG to form TAG, DGAT-1 has also been shown to catalyze the acylation of monoacylglycerol to form DAG (Yen et al., 2005). DGAT-1 and DGAT-2 null mice have been generated and extensively characterized (Smith et al., 2000; Stone et al., 2004). In detail, DGAT-2 null mice are lipopenic and die soon after birth from reductions in substrates for energy metabolism and from impaired permeability barrier function. In contrast, DGAT-1 mice are fertile and viable with a normal life span and do not become obese when fed a TAG rich diet. DGAT-1 null mice exhibit both reduced postprandial plasma TAG levels and increased energy expenditure, but have normal levels of circulating free fatty acids. Conversely, transgenic mice that over-express DGAT-1 in adipose tissue are predisposed to obesity when fed a TAG rich diet and have elevated levels of circulating free fatty acids (Chen et al., 2002).
In humans, DGAT-1 is highly expressed in several tissue types that are relevant to obesity, such as intestine, liver and adipose (Yen et al., 2008). Further, DGAT-1 is predominantly localized to the lumen of the endoplasmic reticulum (Yamazaki et al., 2005). Thus, there are several sites of action for a DGAT-1 inhibitor that can lead to both a reduction in adiposity and body weight. First, blocking DGAT-1 activity in the intestine or liver will inhibit the export of chylomicron and VLDL particles, respectively, thereby reducing peripheral TAG deposition that originates either from dietary TAG re-esterification or from de novo lipogenesis. Second, blocking DGAT-1 activity in adipose tissue will decrease both adipocyte size and number. In both cases, non-esterified fatty acids will be mobilized for use as an energy source rather than used for storage. DGAT-1 inhibition may also generate a peripheral satiety signal resulting in an anorexigenic effect. The phenotype of the DGAT-1 null mice, coupled with DGAT-1's role in human whole body TAG homeostasis, provides a compelling rationale for the investigation of DGAT-1, as a target for the treatment of obesity. Recently, the in vivo pharmacology of a potent orally bioavailable DGAT-1 inhibitor was disclosed (Zhao et al., 2008). Proof of concept studies in rodent models of obesity with this inhibitor demonstrated target engagement, weight loss and reductions in adiposity. This inhibitor showed high oral bioavailability and high systemic exposure.
High systemic exposure of a DGAT-1 inhibitor can potentially result in undesirable side effects such as reduced lactation in nursing females, reduced sebum production, and exacerbation of myocardial injury during ischemia. In detail, human milk TAGs are a major source of nutrition to the nursing infant and systemic inhibition of DGAT-1 would reduce milk TAG production. Female DGAT-1 null mice are unable to nurse their pups due to reduced lactation. Triglycerides are also a major component of human sebum, which is an important skin lubricant. Systemic inhibition of DGAT-1 would reduce sebum production and may result in skin and hair disorders as observed in DGAT-1 null mice. Finally, the systemic inhibition of DGAT-1 could substantially increase free fatty acid availability and utilization by the heart. During ischemia, the utilization of a less efficient fuel source such as fatty acids rather than glucose may enhance myocardial injury.
One approach to improve the therapeutic index of DGAT-1 inhibitors is to exclusively target DGAT-1 expressed in the enterocyte by restricting drug exposure primarily to enterocytes. DGAT-1 inhibitors with low systemic exposure and good oral bioavailability specifically targeted to enterocytes would avoid safety issues potentially associated with compounds that reach high levels in the systemic circulation.
The scope of the present invention is defined by the claims and any information that does not fall within the claims is provided for information only.
The invention relates to DGAT-1 inhibitors for use in treating and/or preventing overweight, obesity and the dyslipidemia associated with it. Because of the mechanism and specific targeting to enterocytes of the DGAT-1 inhibitors of the disclosure, other conditions also can be ameliorated, reduced or avoided. These conditions include high postprandial triglycerides (very common in diabetes) or diet- or obesity-related hypertriglyceridemia, cardiovascular risk associated with excessive triglycerides, and insulin resistance and glucose intolerance (e.g., improved insulin sensitivity due to reduced deposition of liver and skeletal muscle fat) seen in overweight patients, those with diabetes or other glucose metabolic disorders such as Syndrome X, polycystic ovary or other disorders.
The DGAT-1 inhibitor compounds and compositions disclosed herein primarily target enterocytes lining the intestinal walls. Thus, the disclosed compounds can be administered orally and are taken up readily into enterocytes; however, compounds of the disclosure are not readily exported from the enterocytes into the systemic circulation. This results in low systemic exposure to the compounds disclosed herein and reduced risk of systemic side effects associated with general systemic DGAT-1 inhibition.
For a variable that occurs more than one time in any substituent, its definition on each occurrence is independent of its definition at every other occurrence. Combinations of substituents are permissible only if such combinations result in stable compounds. Stable compounds are compounds, which can be isolated in a useful degree of purity from a reaction mixture. Additionally, as used in the specification and the appended claims, unless specified to the contrary, the following terms have the meaning indicated below.
The term "alkyl" refers to a straight or branched or cyclic chain hydrocarbon radical with only single carbon-carbon bonds. Representative examples include methyl, ethyl, propyl, isopropyl, cyclopropyl, butyl, isobutyl, tert-butyl, cyclobutyl, pentyl, cyclopentyl, hexyl, and cyclohexyl, all of which may be optionally substituted. Alkyl groups are C1-C12 and include alkyl groups that are C1-C8 in some embodiments.
The term "aryl" refers to aromatic groups which have 5-14 ring atoms and at least one ring having a conjugated pi electron system and includes carbocyclic aryl, heterocyclic aryl and biaryl groups, all of which may be optionally substituted.
Carbocyclic aryl groups are groups which have, in various embodiments, 6-10 or 6-14 ring atoms wherein the ring atoms on the aromatic ring are carbon atoms. Carbocyclic aryl groups include monocyclic carbocyclic aryl groups and polycyclic or fused compounds such as optionally substituted naphthyl groups.
Heterocyclic aryl or heteroaryl groups are groups which have, in various embodiments, 5-10 or 5-14 ring atoms wherein 1 to 4 heteroatoms are ring atoms in the aromatic ring and the remainder of the ring atoms being carbon atoms. Suitable heteroatoms include oxygen, sulfur, nitrogen, and selenium. Suitable heteroaryl groups include furanyl, thienyl, pyridyl, pyrrolyl, N-lower alkyl pyrrolyl, pyridyl-N-oxide, pyrimidyl, pyrazinyl, imidazolyl, and the like, all optionally substituted.
The term "biaryl" represents aryl groups which have 5-14 atoms containing more than one aromatic ring including both fused ring systems and aryl groups substituted with other aryl groups. Such groups may be optionally substituted. Suitable biaryl groups include naphthyl and biphenyl.
The term "optionally substituted" or "substituted" includes groups substituted by one to six substituents, independently selected from lower alkyl, lower aryl, lower aralkyl, lower cyclic alkyl, lower heterocycloalkyl, hydroxy, lower alkoxy, lower aryloxy, perhaloalkoxy, aralkoxy, lower heteroaryl, lower heteroaryloxy, lower heteroarylalkyl, lower heteroaralkoxy, azido, amino, halo, lower alkylthio, oxo, lower acylalkyl, lower carboxy esters, carboxyl, -carboxamido, nitro, lower acyloxy, lower aminoalkyl, lower alkylaminoaryl, lower alkylaryl, lower alkylaminoalkyl, lower alkoxyaryl, lower arylamino, lower aralkylamino, sulfonyl, lower -carboxamidoalkylaryl, lower -carboxamidoaryl,lower hydroxyalkyl, lower haloalkyl, lower alkylaminoalkylcarboxy-, lower aminocarboxamidoalkyl-, cyano, lower alkoxyalkyl, lower perhaloalkyl, and lower arylalkyloxyalkyl.
"Substituted aryl" and "substituted heteroaryl" refers to aryl and heteroaryl groups substituted with 1-3 substituents. These substituents are selected from the group consisting of lower alkyl, lower alkoxy, lower perhaloalkyl, halo, hydroxy, and amino.
The term "-aralkyl" refers to an alkylene group substituted with an aryl group. Suitable aralkyl groups include benzyl, picolyl, and the like, and may be optionally substituted. "Heteroarylalkyl" refers to an alkylene group substituted with a heteroaryl group.
The term "alkylaryl-" refers to an aryl group substituted with an alkyl group. "Lower alkylaryl-" refers to such groups where alkyl is lower alkyl.
The term "lower" referred to herein in connection with organic radicals or compounds respectively defines such as with up to and including 10, in one aspect up to and including 6, and in another aspect one to four carbon atoms. Such groups may be straight chain, branched, or cyclic.
The term "cyclic alkyl" or "cycloalkyl" refers to alkyl groups that are cyclic of 3 to 10 carbon atoms, and in one aspect are 3 to 6 or 3 to 8 carbon atoms. Suitable cyclic groups include norbornyl and cyclopropyl. Such groups may be substituted.
The term "heterocyclic", "heterocyclic alkyl" or "heterocycloalkyl" refer to cyclic groups of 3 to 10 atoms, and in one aspect are 3 to 6 atoms, containing at least one heteroatom, in a further aspect are 1 to 3 heteroatoms. Suitable heteroatoms include oxygen, sulfur, and nitrogen. Heterocyclic groups may be attached through a nitrogen or through a carbon atom in the ring. The heterocyclic alkyl groups include unsaturated cyclic, fused cyclic and spirocyclic groups. Suitable heterocyclic groups include pyrrolidinyl, morpholino, morpholinoethyl, and pyridyl.
The terms "arylamino" (a), and "aralkylamino" (b), respectively, refer to the group -NRR' wherein respectively, (a) R is aryl and R' is hydrogen, alkyl, aralkyl, heterocycloalkyl, or aryl, and (b) R is aralkyl and R' is hydrogen, aralkyl, aryl, alkyl or heterocycloalkyl.
The term "acyl" refers to -C(O)R where R is alkyl, heterocycloalkyl, or aryl.
The term "carboxy esters" refers to -C(O)OR where R is alkyl, aryl, aralkyl, cyclic alkyl, or heterocycloalkyl, all optionally substituted.
The term "carboxyl" refers to -C(O)OH.
The term "oxo" refers to =O in an alkyl or heterocycloalkyl group.
The term "amino" refers to -NRR' where R and R' are independently selected from hydrogen, alkyl, aryl, aralkyl and heterocycloalkyl, all except H are optionally substituted; and R and R' can form a cyclic ring system.
The term "-carboxylamido" refers to -CONR2 where each R is independently hydrogen or alkyl.
The term "-sulphonylamido" or "-sulfonylamido" refers to -S(=O)2NR2 where each R is independently hydrogen or alkyl.
The term "halogen" or "halo" refers to -F, -Cl, -Br and -I.
The term "alkylaminoalkylcarboxy" refers to the group alkyl-NR-alk-C(O)-O- where "alk" is an alkylene group, and R is a H or lower alkyl.
The term "sulphonyl" or "sulfonyl" refers to -SO2R, where R is H, alkyl, aryl, aralkyl, or heterocycloalkyl.
The term "sulphonate" or "sulfonate" refers to -SO2OR, where R is -H, alkyl, aryl, aralkyl, or heterocycloalkyl.
The term "alkenyl" refers to unsaturated groups which have 2 to 12 atoms and contain at least one carbon-carbon double bond and includes straight-chain, branched-chain and cyclic groups. Alkenyl groups may be optionally substituted. Suitable alkenyl groups include allyl. "1-alkenyl" refers to alkenyl groups where the double bond is between the first and second carbon atom. If the 1-alkenyl group is attached to another group, e.g., it is a W substituent attached to the cyclic phosphonate, it is attached at the first carbon.
The term "alkynyl" refers to unsaturated groups which have 2 to 12 atoms and contain at least one carbon-carbon triple bond and includes straight-chain, branched-chain and cyclic groups. Alkynyl groups may be optionally substituted. Suitable alkynyl groups include ethynyl. "1-alkynyl" refers to alkynyl groups where the triple bond is between the first and second carbon atom. If the 1-alkynyl group is attached to another group, e.g., it is a W substituent attached to the cyclic phosphonate, it is attached at the first carbon.
The term "alkylene" refers to a divalent straight chain, branched chain or cyclic saturated aliphatic group. In one aspect the alkylene group contains up to and including 10 atoms. In another aspect the alkylene chain contains up to and including 6 atoms. In a further aspect the alkylene groups contains up to and including 4 atoms. The alkylene group can be either straight, branched or cyclic.
The term "acyloxy" refers to the ester group -O-C(O)R, where R is H, alkyl, alkenyl, alkynyl, aryl, aralkyl, or heterocycloalkyl.
The term "aminoalkyl-"refers to the group NR2-alk- wherein "alk" is an alkylene group and R is selected from -H, alkyl, aryl, aralkyl, and heterocycloalkyl.
The term "alkylaminoalkyl-"refers to the group alkyl-NR-alk- wherein each "alk" is an independently selected alkylene, and R is H or lower alkyl. "Lower alkylaminoalkyl-"refers to groups where the alkyl and the alkylene group is lower alkyl and alkylene, respectively.
The term "arylaminoalkyl-"refers to the group aryl-NR-alk- wherein "alk" is an alkylene group and R is -H, alkyl, aryl, aralkyl, or heterocycloalkyl. In "lower arylaminoalkyl-", the alkylene group is lower alkylene.
The term "alkylaminoaryl-"refers to the group alkyl-NR-aryl- wherein "aryl" is a divalent group and R is -H, alkyl, aralkyl, or heterocycloalkyl. In "lower alkylaminoaryl-", the alkyl group is lower alkyl.
The term "alkoxyaryl-"refers to an aryl group substituted with an alkyloxy group. In "lower alkyloxyaryl-", the alkyl group is lower alkyl.
The term "aryloxyalkyl-"refers to an alkyl group substituted with an aryloxy group.
The term "aralkyloxyalkyl-"refers to the group aryl-alk-O-alk- wherein "alk" is an alkylene group. "Lower aralkyloxyalkyl-"refers to such groups where the alkylene groups are lower alkylene.
The term "alkoxy-"or "alkyloxy-" refers to the group alkyl-O-.
The term "alkoxyalkyl-"or "alkyloxyalkyl-" refer to the group alkyl-O-alk- wherein "alk" is an alkylene group. In "lower alkoxyalkyl-", each alkyl and alkylene is lower alkyl and alkylene, respectively.
The terms "alkylthio-"and "alkylthio-" refer to the group alkyl-S-.
The term "alkylthioalkyl-"refers to the group alkyl-S-alk- wherein "alk" is an alkylene group. In "lower alkylthioalkyl-"each alkyl and alkylene is lower alkyl and alkylene, respectively.
The term "alkoxycarbonyloxy-"refers to alkyl-O-C(O)-O-.
The term "aryloxycarbonyloxy-"refers to aryl-O-C(O)-O-.
The term "alkylthiocarbonyloxy-"refers to alkyl-S-C(O)-O-.
The term "amido" refers to the NR2 group next to an acyl or sulfonyl group as in NR2-C(O)-, RC(O)-NR1-, NR2-S(=O)2- and RS(=O)2-NR1-, where R and R1 include -H, alkyl, aryl, aralkyl, and heterocycloalkyl.
The term "carboxamido" refer to NR2-C(O)- and RC(O)-NR1-, where R and R1 include -H, alkyl, aryl, aralkyl, and heterocycloalkyl. The term does not include urea, -NR-C(O)-NR-.
The terms "sulphonamido" or "sulfonamido" refer to NR2-S(=O)2- and RS(=O)2-NR1-, where R and R1 include -H, alkyl, aryl, aralkyl, and heterocycloalkyl. The term does not include sulfonylurea, -NR-S(=O)2-NR-.
The term "carboxamidoalkylaryl" and "carboxamidoaryl" refers to an aryl-alk-NR1-C(O), and ar-NR1-C(O)-alk-, respectively where "ar" is aryl, "alk" is alkylene, R1 and R include H, alkyl, aryl, aralkyl, and heterocycloalkyl.
The term "sulfonamidoalkylaryl" and "sulfonamidoaryl" refers to an aryl-alk-NR1-S(=O)2-, and ar-NR1-S(=O)2-, respectively where "ar" is aryl, "alk" is alkylene, R1 and R include -H, alkyl, aryl, aralkyl, and heterocycloalkyl.
The term "hydroxyalkyl" refers to an alkyl group substituted with one -OH.
The term "haloalkyl" refers to an alkyl group substituted with one halo.
The term "cyano" refers to -C≡N.
The term "nitro" refers to -NO2.
The term "acylalkyl" refers to an alkyl-C(O)-alk-, where "alk" is alkylene.
The term "aminocarboxamidoalkyl-"refers to the group NR2-C(O)-N(R)-alk- wherein R is an alkyl group or H and "alk" is an alkylene group. "Lower aminocarboxamidoalkyl-" refers to such groups wherein "alk" is lower alkylene.
The term "heteroarylalkyl" refers to an alkylene group substituted with a heteroaryl group.
The term "perhalo" refers to groups wherein every C-H bond has been replaced with a C-halo bond on an aliphatic or aryl group. Suitable perhaloalkyl groups include -CF3 and -CFCl2.
The term "carboxylic acid moiety" refers to a compound having a carboxylic acid group (-COOH), and salts thereof, a carboxylic acid ester, or a carboxylic acid surrogate. Suitable carboxylic acid surrogates include a tetrazole group, a hydroxamic acid group, a thiazolidinedione group, an acylsulfonamide group, and a 6-azauracil. (see, e.g.,
The phrase "therapeutically effective amount" means an amount of a compound or a combination of compounds that ameliorates, attenuates or eliminates one or more of the symptoms of a particular disease or condition or prevents, modifies, or delays the onset of one or more of the symptoms of a particular disease or condition.
The term "pharmaceutically acceptable salt" includes salts of compounds of Formula I derived from the combination of a compound of this disclosure and an organic or inorganic acid or base. Suitable acids include acetic acid, adipic acid, benzenesulfonic acid, (+)-7,7-dimethyl-2-oxobicyclo[2.2.1]heptane-1-methanesulfonic acid, citric acid, 1,2-ethanedisulfonic acid, dodecyl sulfonic acid, fumaric acid, glucoheptonic acid, gluconic acid, glucuronic acid, hippuric acid, hydrochloride hemiethanolic acid, HBr, HCl, HI, 2-hydroxyethanesulfonic acid, lactic acid, lactobionic acid, maleic acid, methanesulfonic acid, methylbromide acid, methyl sulfuric acid, 2-naphthalenesulfonic acid, nitric acid, oleic acid, 4,4'-methylenebis [3-hydroxy-2-naphthalenecarboxylic acid], phosphoric acid, polygalacturonic acid, stearic acid, succinic acid, sulfuric acid, sulfosalicylic acid, tannic acid, tartaric acid, terphthalic acid, and p-toluenesulfonic acid.
The term "patient" means an animal.
The term "animal" includes birds and mammals, in one embodiment a mammal, including a dog, cat, cow, horse, goat, sheep, pig or human. In one embodiment the animal is a human. In another embodiment the animal is a male. In another embodiment the animal is a female.
The term "hypercholesterolemia" refers to presence of an abnormally large amount of cholesterol in the cells and plasma of the circulating blood.
The term "hyperlipidemia" or "lipemia" refers to the presence of an abnormally large amount of lipids in the circulating blood.
The term "atherosclerosis" refers to a condition characterized by irregularly distributed lipid deposits in the intima of large and medium-sized arteries wherein such deposits provoke fibrosis and calcification. Atherosclerosis raises the risk of angina, stroke, heart attack, or other cardiac or cardiovascular conditions.
The term "obesity" refers to the condition of being obese. Being obese is defined as a BMI of 30.0 or greater; and extreme obesity is defined at a BMI of 40 or greater. "Overweight" is defined as a body mass index of 25.0 to 29.9 (This is generally about 10 percent over an ideal body weight)
The term "impaired glucose tolerance (IGT)" refers to a condition known to precede the development of overt type 2 diabetes. It is characterized by abnormal blood glucose excursions following a meal. The current criteria for the diagnosis of IGT are based on 2-h plasma glucose levels post a 75g oral glucose test (144-199 mg/dL). Although variable from population to population studied, IGT progresses to full blown NIDDM at a rate of 1.5 to 7.3% per year, with a mean of 3-4% per year. Individuals with IGT are believed to have a 6 to 10-fold increased risk in developing NIDDM. IGT is an independent risk factor for the development of cardiovascular disease.
The term "insulin resistance" is defined clinically as the impaired ability of a known quantity of exogenous or endogenous insulin to increase whole body glucose uptake and utilization. As insulin regulates a wide variety of metabolic processes in addition to glucose homeostasis (e.g., lipid and protein metabolism), the manifestations of insulin resistance are diverse and include one or more of the following: glucose intolerance, hyperinsulinemia, a characteristic dyslipidemia (high triglycerides; low high-density lipoprotein cholesterol, and small, dense low-density lipoprotein cholesterol), obesity, upper-body fat distribution, fat accumulation in the liver (non-alcoholic fatty liver disease), NASH (non-alcoholic steatohepatitis), increased hepatic glucose output, reduced hepatic glucose uptake and storage into glycogen, hypertension, and increased prothrombotic and antifibrinolytic factors. This cluster of cardiovascular-metabolic abnormalities is commonly referred to as "The Insulin Resistance Syndrome" or "The Metabolic Syndrome" and may lead to the development of type 2 diabetes, accelerated atherosclerosis, hypertension or polycystic ovarian syndrome.
The Metabolic Syndrome" or "Metabolic Syndrome X" is characterized by a group of metabolic risk factors in one person. They include:
- Central obesity (excessive fat tissue in and around the abdomen)
- Atherogenic dyslipidemia (blood fat disorders - mainly high triglycerides and low HDL cholesterol - that foster plaque buildups in artery walls)
- Raised blood pressure (130/85 mmHg or higher)
- Insulin resistance or glucose intolerance (the body can't properly use insulin or blood sugar)
- Prothrombotic state (e.g., high fibrinogen or plasminogen activator inhibitor [-1] in the blood)
- Proinflammatory state (e.g., elevated high-sensitivity C-reactive protein in the blood)
According to the present disclosure, "Metabolic Syndrome" or "Metabolic Syndrome X" is identified by the presence of three or more of these components:
- Central obesity as measured by waist circumference:
- Men: Greater than 40 inches
- Women: Greater than 35 inches
- Fasting blood triglycerides greater than or equal to 150 mg/dL
- Blood HDL cholesterol:
- Men: Less than 40 mg/dL
- Women: Less than 50 mg/dL
- Blood pressure greater than or equal to 130/85 mmHg
- Fasting glucose greater than or equal to 110 mg/dL
The term "metabolic disease" includes diseases and conditions such as obesity, diabetes and lipid disorders such as hypercholesterolemia, hyperlipidemia, hypertriglyceridemia as well as disorders that are associated with abnormal levels of lipoproteins, lipids, carbohydrates and insulin such as metabolic syndrome X, diabetes, impaired glucose tolerance, atherosclerosis, coronary heart disease, cardiovascular disease.
As used herein, the term "significant" or "statistically significant" means a result (i.e. experimental assay result) where the p-value is ≤ 0.05 (i.e. the chance of a type I error is less than 5%) as determined by an art-accepted measure of statistical significance appropriate to the experimental design.
The present disclosure provides compounds that are useful for treating or preventing conditions and disorders associated with DGAT in mammals, particularly humans. One aspect of the disclosure is directed towards the compounds represented by Formula (I), pharmaceutically acceptable salts or stereoisomers thereof,
Q-G1-G2-G3-G4-Z Formula (I)
wherein
Q is Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, or Q9, as defined herein and for each of Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, or Q9, common substituents found in the structures are defined as follows:
- R1 is selected from the group consisting of H, (C1-C8)alkyl, halo(C1-C4)alkyl, (C2-C8)alkenyl, (C2-C8)alkynyl, C(O)Ra, ORa and NRaRb ; optionally, when X is C (R4), Ra or Rb may be combined with R4 or R4 may be combined with R1 to form a 5-, 6-or 7- membered fused ring;
- Ra and Rb are independently selected from the group consisting of H, (C1-C8)alkyl, (C2-C8)alkenyl, (C2-C8)alkynyl, fluoro(C1-C8)alkyl, (C3-C8)cycloalkyl, aryl, heteroaryl and aryl(C1-C4)alkyl;
- R2 and R3 are independently selected from the group consisting of H, (C1-C8)alkyl, (C2-C8)alkenyl, (C2-C8)alkynyl, C(O)Ra, CO2Ra, C(O)NRaRb, (C1-C4)alkylene-ORa and (C1-C4)perfluoroalkyl; or R2 and R3 may be combined to form a 3-, 4-, 5- or 6-membered spiro ring; optionally, having from 0 to 3 heteroatoms selected from the group consisting of N, O and S;
- each R4 is independently selected from the group consisting of H, (C1-C8)alkyl, (C2-C8)alkenyl, (C2-C8)alkynyl, fluoro(C1-C8)alkyl, aryl, aryl(C1-C4)alkyl, C(O)Ra, CO2Ra and C(O)NRaRb;
- R6 is an optionally substituted aryl or optionally substituted heteroaryl group, wherein the optional substituents are one or more groups selected from H, (C1-C4)alkyl, halo, halo(C1-C4)alkyl, cyano, (C1-C4)alkoxy, (C1-C4)haloalkoxy, -C(O)xRa, -ORa, -S(O)xRa, -NRaRb,-C(O)NRaRb, -NRaC(O)Rb, -NRaCO NRaRb, -S(O)2 NRaRb or -NRaS(O)2NRaRb where x is an integer of 1 or 2,
- T is N, CH or CMe;
- R8 is independently selected from halo, (C1-C6)alkyl, (C2-C6)alkenyl, aryl, heteroaryl, (C3-C8)cycloalkyl, cyano, (C1-C6)haloalkyl, (C1-C6)haloalkoxy, -ORa, -O-C(O)(Ra), -S(Ra),-S(O)(Rb), -S(O)2(Rb), -C(O)(Ra), -C(O)(ORa), -N(Ra)2, -N(Ra)-C(O)(Ra), -C(O)N(Ra)2,-S(O)2N(Ra)2, -(CRaRb)tORa, -(CRaRb)t-O-C(O)(Ra), -(CRaRb)tS(Ra), -(CRaRb)tS(O)(Rb),-(CRaRb)tS(O)2(Rb), -(CRaRa)tC(O)(Ra), -(CRaRb)tC(O)(ORa), -(CRaRb)rN(RaRb -(CRaRb)tN(Ra)-C(O)(Ra), -(CRaRb)tC(O)N(Ra)2, -(CRaRa)tS(O)2N(Ra)2 or -(CRaRb)tRa and wherein t is an integer of 1, 2, 3, or 4;
- Q1 is
- wherein J is selected from -NRaRb or -ORa;
- X is selected from the group consisting of C(R4) and N; optionally, when X is C (R4), Ra or Rb may be combined with R4 or R4 may be combined with R1 to form a 5-, 6-or 7-membered fused ring;
- E is selected from the group consisting of O and S;
- Q2 is
- R5 is H or (C1-C4)alkyl;
- X is N or C(R4) and when X is C(R4), R4 may be combined with R1 to form a 5-, 6-or 7- membered fused ring;
- R2 and R3 are as defined above or may be combined with R5 to form a 3-, 4-, 5- or 6-membered spiro ring; optionally, having from 0 to 3 heteroatoms selected from the group consisting of N, O and S ;
- Q3 is
- Q4 is
- Q5 is
- Q6 is
- R17(V)nC(O)(NH)m-
- R7 is (C1-C8)alkyl, aryl, heteroaryl or (C3-C8)cycloalkyl; wherein each of the aryl, heteroaryl and cycloalkyl is independently substituted with 1, 2, 3, 4, or 5 substituents independently selected from the group consisting of (C1-C8)alkyl, (C2-C8)alkenyl, (C2-Cs)alkynyl, -CN, halogen, ethylenedioxy, methylenedioxy, haloalkyl, -ORa, -O-C(O)(Ra),-S(Ra), -S(O)(Rb), -S(O)2(Rb), -C(O)(Ra), -C(O)(ORa), -N(Ra)2, -N(Ra)-C(O)(Ra), -C(O)N(Ra)2, -S(O)2N(Ra)2, -(CRaRb)tORa, -(CRaRb)t-O-C(O)(Ra), -(CRaRb)tS(Ra), -(CRaRb)tS(O)(Rb),-(CRaRb)tS(O)2(Rb), -(CRaRa)tC(O)(Ra), -(CRaRb)tC(O)(ORa), -(CRaRb)rN(RaRb-(CRaRb)tN(Ra)-C(O)(Ra), -(CRaRb)tC(O)N(Ra)2, -(CRaRa)tS(O)2N(Ra)2 and -(CRaRb)tRa,
- V is -NH-, -O-, -(CRaRb)t-
- where t is an integer of 1, 2, 3, or 4.
- m is 0 or 1
- n is 0 or 1
- Q7 is
- wherein D is O, NRc, or S; and
- A is a fused ring selected from an aromatic 6-membered ring containing 0 or 2 N atoms;
- the number of R8 substituents on A ring may be 0, 1 or 2 and when two of said R8 substituents are: a) found on A ring; b) (C1-C6)alkyl and c) attached to adjacent carbon atoms of the Ring A, they may be joined together to form a 5 to 7-membered carbocyclic ring; and
- Rc is H or (C1-C6)alkyl, hydroxyl(C2-C6)alkyl
- Q8 is
- L is N or C(R8); and
- the number of R8 substituents on A ring may be 0, 1, 2 or 3 and when two of said R8 substituents are: a) found on A ring; b) (C1-C6)alkyl and c) attached to adjacent carbon atoms of the Ring A, they may be joined together to form a 5 to 7-membered carbocyclic ring they may be joined together to form a 5 to 7-membered ring containing 0, 1, 2 or 3 heteroatoms selected from O, N, S; or
- Q9 is a [5,5], [5,6], [6,5] and [6,6] bicylic heterocycle containing 1 to 4 N atoms where G1 is connected through one of the ring N atoms;
- G1 and G3 are independently selected from the group consisting of cyclo(C3-C8)alkylene, heterocyclo(C3-C8)alkylene, arylene and heteroarylene, optionally substituted with one or two groups independently selected from halo, (C1-C6)alkyl, (C2-C6)alkenyl, (C1-C6)alkoxy, cyano, (C1-C6)haloalkyl, (C1-C6)haloalkoxy, (C1-C4)perfluoroalkyl; -N(RaRb),-N(Ra)-C(O)(Ra), -C(O)N(Ra)2, -S(O)2N(Ra)2, -S(O)2(Rb) and -C(O)(Ra).
- G2 is selected from the group consisting of a bond, (C1-C4)alkylene, (C2-C4)alkenylene, O, N(Ra)C(O), S and S(O)2;
- G4 is -X-Y-
- wherein X is selected from null, O, NH, CO, CHOH, S or S(O)2; and Y is selected from (C1-C4)alkylene, (C3-C8)-cycloalkylene or (C3-C8)-heterocycloalkylene, -CH(R9)C(R10R11)- or -N(R9)C(R10R11)-
wherein - R10 and R11 are both hydrogen, and R9 is hydrogen, (C1-C6)alkyl, (C1-C6)alkoxy, (C2-C6)alkenyl, phenoxy-(C2-C6)alkyl, 1-methyl-1H-indol-3-yl, bis[(C1-C6)alkyl]amino-(C2-C6)alkyl, 1-piperidinyl-(C2-C6)alkyl, 1-pyrrolidinyl-(C2-C6)alkyl, or 1-morpholinyl-(C2-C6) alkyl;
or - R10 and R11 are both hydrogen and R9 is R12(CH2)m, where m is 0 to 3, and R12 is phenyl optionally substituted with one or more halogen, hydroxy, (C1-C6)alkyl, (C1-C6)alkoxy, trifluoromethyl or cyano;
or - R10 and R11 are both hydrogen and R9 is R12(CH2)m, where m is 0 to 3, and R12 is 2-pyridinyl, 3-pyridinyl, or 4-pyridinyl, each of which is optionally substituted
with halogen, (C1-C6)alkyl, (C1-C6)alkoxy, trifluoromethyl or cyano; or - R9 is hydrogen, and R10 and R11 together with the carbon atom to which they are attached, form a three to five-membered ring, with 0 to 2 heteroatoms independently selected from O, S or N; or R10 is hydrogen, and R9 and R11 together with the two carbon atoms to which they are attached, form a three- to six-membered ring with 0 to 2 heteroatoms independently selected from O, S or N;
- Z is Z1 or Z2 as defined herein;
- Z1 is
- X1 and X2 are independently selected from null, (C(RaRb))n, O, NRa, S or CO and n is 0 or 1; W is selected from H, (C1-C6)alkyl, aryl, heteroaryl or (C3-C8)cycloalkyl; wherein each of the alkyl, aryl, heteroaryl and cycloalkyl is independently substituted with 1, 2, 3, 4, or 5 substituents independently selected from the group consisting of (C1-C6)alkyl, (C2-C8)alkenyl, (C2-C8)alkynyl, -CN, halogen, ethylenedioxy, methylenedioxy, haloalkyl, -ORa,-O-C(O)(Ra), -S(Ra), -S(O)(Rb), -S(O)2(Rb), -C(O)(Ra), -C(O)(ORa), -N(Ra)2, -N(Ra)-C(O)(Ra), -C(O)N(Ra)2, -S(O)2N(Ra)2, -(CRaRb)tORa, -(CRaRb)t-O-C(O)(Ra), -(CRaRb)tS(Ra),-(CRaRb)tS(O)(Rb), -(CRaRb)tS(O)2(Rb), -(CRaRa)tC(O)(Ra), -(CRaRb)tC(O)(ORa),-(CRaRb)tN(RaRb) -(CRaRb)tN(Ra)-C(O)(Ra), -(CRaRb)tC(O)N(Ra)2, -(CRaRa)tS(O)2N(Ra)2 and -(CRaRb)tRa, -(CRaRb)tP(O)(OH)2, and -(CRaRb)tP(O)(OH)(Ra), wherein t is an integer of 1, 2, 3, or 4;;
- X1 and X2 may be combined to form a 5-, 6- or 7-membered ring having from 0 to 3 heteroatoms selected from the group consisting of NRa, O and S; or X1 or X2 may be combined with W to form a 5-, 6-or 7-membered fused ring having from 0 to 3 heteroatoms selected from the group consisting of NRa, O and S;
- Z2 is Z1, H, -OH, CO2Ra or -C(O)N(Ra)2;
with a proviso that when X2 is O and Q is Q1, Q2, Q3, Q4, Q5, Q6, Q7 or Q9, then X1 is not (C(RaRb))n and when Q is Q8 then Z is Z2 and Z2 is Z1, H, -OH, CO2Ra or -C(O)N(Ra)2.
Another aspect of the disclosure provides for pharmaceutically acceptable salts of the compounds of Formula (I), in addition to those discussed in the definitions section of this application. Such salts include the conventional non-toxic salts and the quaternary ammonium salts which are formed, for example, from inorganic or organic acids or bases by means well known in the art. For example, such acid addition salts include acetate, adipate, alginate, ascorbate, aspartate, benzoate, benzenesulfonate, bisulfate, butyrate, citrate, camphorate, camphorsulfonate, cinnamate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, fumarate, glucoheptanoate, glycerophosphate, hemisulfate, heptanoate, hexanoate, hydrochloride, hydrobromide, hydroiodide, 2-hydroxyethanesulfonate, itaconate, lactate, maleate, mandelate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, nitrate, oxalate, pamoate, pectinate persulfate, 3-phenylpropionate, picrate, pivalate, propionate, succinate, sulfonate, tartrate, thiocyanate, tosylate, and undecanoate. Base salts include alkali metal salts such as potassium and sodium salts, alkaline earth metal salts such as calcium and magnesium salts, and ammonium salts with organic bases such as dicyclohexylamine salts and N-methyl-D-glucamine. Additionally, basic nitrogen containing groups may be quaternized with such agents as lower alkyl halides such as methyl, ethyl, propyl, and butyl chlorides, bromides and iodides; dialkyl sulfates like dimethyl, diethyl, and dibutyl sulfate and diamyl sulfates; long chain halides such as decyl, lauryl, myristyl and strearyl chlorides, bromides, and iodides; aralkyl halides like benzyl and phenethyl bromides and others.
Another aspect of the disclosure provides pharmaceutical compositions formed by combining the compounds of this disclosure with pharmaceutically acceptable carriers, vehicles or diluents. These pharmaceutically acceptable compositions can, then, be administered in a variety of dosage forms such as tablets, powders, lozenges, syrups, injectable solutions and the like. These pharmaceutical compositions can, if desired, contain additional ingredients such as flavorings, binders and/or excipients.
Thus, one aspect of the disclosure provides pharmaceutical composition for oral administration. For example, tablets containing various excipients such as sodium citrate, calcium carbonate and/or calcium phosphate, may be employed along with various disintegrants such as starch, alginic acid and/or certain complex silicates, together with binding agents such as polyvinylpyrrolidone, sucrose, gelatin and/or acacia. Additionally, lubricating agents such as magnesium stearate, sodium lauryl sulfate and talc are often useful for tabletting purposes. Solid compositions comprising the aforementioned excipients, disintegrants and/or lubricating agents may also be employed as fillers in soft and hard filled gelatin capsules. Additionally, materials such as lactose or milk sugar and high molecular weight polyethylene glycols can also be utilized in the preparation of soft or hard capsules disclosed herein. When aqueous suspensions or elixirs are desired for oral administration, the active pharmaceutical agent therein may be combined with various sweetening or flavoring agents, coloring matter or dyes and, if desired, emulsifying or suspending agents, together with diluents such as water, ethanol, propylene glycol, glycerin and/or combinations thereof. Tablets and capsules disclosed herein can also be formulated with enteric coatings known to those skilled in the art.
For parenteral administration, solutions comprising compounds disclosed herein can be formulated in oils (such as sesame or peanut oil), aqueous propylene glycol, or in sterile aqueous solutions. Aqueous solutions should be suitably buffered, if necessary, and the liquid diluent first rendered isotonic with sufficient saline or glucose. Compounds formulated as discussed herein are suitable for intravenous, intramuscular, subcutaneous and intraperitoneal administration. In this connection, the sterile aqueous media employed are all readily available by standard techniques known to those skilled in the art.
For intranasal administration or administration by inhalation, the compounds or compositions of the disclosure are conveniently delivered in the form of a solution or suspension from a pump spray container that is squeezed or pumped by the patient or as an aerosol spray presentation from a pressurized container or a nebulizer, with the use of a suitable propellant, e.g., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas. In the case of a pressurized aerosol, the dosage unit may be determined by providing a valve to deliver a metered amount. The pressurized container or nebulizer may contain a solution or suspension of a compound of this disclosure. Capsules and cartridges (made, for example, from gelatin) for use in an inhaler or insufflator may be formulated containing a powder mix of a compound or compounds of the disclosure and a suitable powder base such as lactose or starch.
Methods of preparing various pharmaceutical compositions with a certain amount of active ingredient are known, or will be apparent in light of this disclosure, to those skilled in this art. Methods of preparing pharmaceutical compositions are known to those skilled in the art (see
In another aspect of the disclosure, methods of inhibiting or reducing the activity of DGAT-I in enterocytes are provided that comprise contacting an enterocyte with a composition comprising a compound of Formula (I), or a pharmaceutically acceptable salt of a compound of Formula (I). In this aspect of the disclosure, the enterocyte is contacted with an amount of the composition sufficient to inhibit DGAT-1 activity within the cell. This method can be conducted in vitro or in vivo.
The terms "treating", "treated", or "treatment as employed herein includes palliating, slowing progression and/or reducing symptoms associated with a disease, such as obesity, insulin resistance syndrome, Type 2 diabetes, or adiposity. The phrase "therapeutically effective amount" means an amount of a compound of the present disclosure that (i) treats the particular disease, condition, or disorder, (ii) attenuates, ameliorates, or eliminates one or more symptoms of the particular disease, condition, or disorder, or (iii) delays the onset of one or more symptoms of the particular disease, condition, or disorder described herein.
In another aspect of the disclosure, methods of treating a disease or condition amenable to treatment via DGAT-1 inhibition are provided. These methods comprise administering to a mammal a therapeutically effective amount of a compound of Formula (I), or a pharmaceutically acceptable salt of the compound, either alone or in combination with an anti-diabetic agent as described above. Conditions that can be treated in this aspect of the disclosure include Type 2 diabetes, insulin resistance syndrome, obesity, impaired glucose tolerance, hyperglycemia, high postprandial triglycerides (very common in diabetes) or diet- or obesity-related hypertriglyceridemia, cardiovascular risk associated with excessive triglycerides, and insulin resistance and glucose intolerance (e.g., improved insulin sensitivity due to reduced deposition of liver and skeletal muscle fat) seen in overweight patients, those with diabetes or other glucose metabolic disorders such as Syndrome X, polycystic ovary disease or other disorders such as diabetic complications that arise from obesity.
The present disclosure also relates to therapeutic methods for treating the above described conditions in a mammal, including a human, wherein a compound of Formula (I) is administered as part of an appropriate dosage regimen designed to obtain the benefits of the therapy. The appropriate dosage regimen, the amount of each dose administered and the intervals between doses of the compound will depend upon the compound of Formula (I) of this disclosure being used, the type of pharmaceutical compositions being used, the characteristics of the subject being treated and the severity of the conditions.
In general, an effective dosage for the compounds of the present disclosure is in the range of 0.01 mg/kg/day to 1000 mg/kg/day, preferably 0.01 mg/kg/day to 600 mg/kg/day of active compound (i.e., a compound of Formula (I)) in single or divided doses (for example, three doses of 200 mg/kg over the course of a day). Some variation in dosage will necessarily occur, however, depending on the condition of the subject being treated. The individual responsible for dosing will, in any event, determine the appropriate dose for the individual subject. Practitioners will appreciate that "kg" refers to the weight of the subject measured in kilograms.
The compounds or compositions of this disclosure may be administered in single (e.g., once daily) or multiple doses or via constant infusion. The compounds of this disclosure may also be administered alone or in combination with pharmaceutically acceptable carriers, vehicles or diluents, in either single or multiple doses. The compounds or compositions of the present disclosure may be administered to a subject in need of treatment by a variety of conventional routes of administration, including orally and parenterally, (e.g., intravenously or subcutaneously). Further, the pharmaceutical compositions of this disclosure may be administered intranasally, as a suppository, or using a "flash" formulation, i.e., allowing the medication to dissolve in the mouth without the need to use water. The compounds are preferably delivered via a route that accesses the alimentary tract, e.g., orally or nasally.
Combination therapies utilizing compounds of Formula (I) are provided by yet another aspect of the disclosure. Thus, compounds of Formula (I) can be administered in combination (concomitantly or sequentially and as a single combined composition or as separate compositions that are separately administered), with anti-diabetic and/or anti-obesity agents known to those skilled in the art. Non-limiting examples of anti-obesity agents include: 1) central nervous system agents that affect neurotransmitters or neural ion channels, including antidepressants (bupropion), selective serotonin 2c receptor agonists, antiseizure agents (topiramate, zonisamide), some dopamine antagonists, and cannabinoid-1 receptor antagonists (rimonabant); 2) leptin/insulin/central nervous system pathway agents, including leptin analogues, leptin transport and/or leptin receptor promoters, ciliary neurotrophic factor (Axokine), neuropeptide Y and agouti-related peptide antagonists, proopiomelanocortin and cocaine and amphetamine regulated transcript promoters, alpha-melanocyte-stimulating hormone analogues, melanocortin-4 receptor agonists, and agents that affect insulin metabolism/activity, which include protein-tyrosine phosphatase-1B inhibitors, peroxisome proliferator activated receptor-gamma receptor antagonists, short-acting bromocriptine (ergoset), somatostatin agonists (octreotide), and adiponectin; 3) gastrointestinal-neural pathway agents, including those that increase cholecystokinin activity, increase glucagon-like peptide-1 activity (extendin 4, liraglutide, dipeptidyl peptidase IV inhibitors), and increase protein YY3-36 activity and those that decrease ghrelin activity, as well as amylin analogues (pramlintide); 4) agents that may increase resting metabolic rate ("selective" beta-3 stimulators/agonist, uncoupling protein homologues, and thyroid receptor agonists); and 5) other more diverse agents, including melanin concentrating hormone antagonists, phytostanol analogues, functional oils, P57, amylase inhibitors, growth hormone fragments, synthetic analogues of dehydroepiandrosterone sulfate, antagonists of adipocyte 11B-hydroxysteroid dehydrogenase type 1 activity, corticotropin-releasing hormone agonists, inhibitors of fatty acid synthesis, carboxypeptidase inhibitors, indanones/indanols, aminosterols, and other gastrointestinal lipase inhibitors (ATL962). Anti-diabetic agents that can be used in the aforementioned combination therapies include, and are not limited to: insulin; sulfonylurea compounds, such as glyburide, tolbutamide, acetohexamide, tolazamide, chlorpropamide, glipizide, glimepiride or gliclazide; meglitinides, such as repaglinide or nateglinide; biguanides, such as metformin, phenformin or buformin; thiazolidinediones, such as rosigliazone, pioglitozone or troglitazone, alpha-glucosidase inhibitors, such as miglitol or asarabose; peptides or peptide analogs, such as glucagon-like peptide 1, gastric inhibitory peptide, exenatide, exendin-4, liraglutide or taspoglatide; DPP-IV inhibitors, such as vildagliptin or sitaliptin; amylin analogs, such as pramlintide; PPARα/γ ligands, such as aleglitazar, muraglitazar or tesaglitazar; SGLT (sodium-dependent glucose transporter 1) or FBPase (fructose 1,6-bisphosphatase) inhibitors, such as those disclosed in
Numerous compounds of the disclosure have been synthesized and shown to target enterocytes and exhibit inhibition of DGAT-1. Various data are shown by way of example below. The physical characteristics of some molecules of the disclosure are included in Table 1 below.
The synthesis of compounds of Formula (I), wherein the groups Q, Q1, Q2, Q3, Q4, Q5, Q6, Q7 Q8, Q9, G1, G2, G3, G4, Z, Z1, Z2, X, X1, X2, T, E, J, A, D, T, Ra, Rb, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12 and integers t, m, or n have the meanings as set forth in the Detailed Description section unless otherwise noted, is exemplified in Schemes 1-8.
Compounds of the present disclosure can be prepared beginning with commercially available starting materials and using general synthetic techniques known to those of skill in the art. Outlined below are reaction schemes suitable for preparing such compounds.
As illustrated in Scheme 1, compounds of formula 5 can be synthesized starting from commercially available compounds such as of formula 1. These carbonyl compounds upon Wittig type condensation with methylenediphosphonate ester in presence of a base result in the homologoted unsaturated phosphonate adducts (
Deprotection of phosphorus ester of 4 can be achieved by a variety of methods depending on the choice of R' group. Alkyl esters undergo deprotection under bromotrimethyl silane (TMSBr) hydrolysis conditions. Hexamethyl disilazane is used as an additive with TMSBr where the substrate is acid-sensitive. Acid mediated deprotection conditions are used for t-butyl esters. In case of phenyl substituted esters, deprotection may be achieved by base hydrolysis. Whereas, benzyl or allyl esters undergo deprotection in neutral conditions such as hydrogenation in the presence of a catalyst and reaction by palladium catalysis, respectively. These deprotection conditions exemplified for conversion of 4 to 5 may be utilized across all the synthetic sequences that are described herein (Schemes 1-8).
Alternatively, Z group substitution may be introduced at a later stage of the synthesis as shown in scheme 3. Such a synthetic strategy may be applied to prepare compounds of formula 11 from 10 where Q is substituted with Q1, Q2, Q3, Q4, Q5, Q8 or Q9. Compounds of formula 10 can be attained following earlier described procedures in
Compounds that have heterocyclic substitution as in 15 may be obtained from 13 via coupling of precursors of formula 12. Such sequence to 15 may be a linear synthesis as in scheme 1 or convergent sequence as in scheme 3. Synthesis of compounds of formula 12 can be achieved from commercially available halomethylene phosphonate diesters via the transformations that were described earlier in scheme 1, in the conversion of compounds of formula 2 to 3. Base mediated coupling of 12 and 13 to 14 and conversion to 15 may be achieved as described in
Compounds of formula 17 (Scheme 4) can be synthesized from 16 where X'" is -OH or -NH2 as described in
The methods described for amine precursor 16 may also be applied in the preparation of compounds of formula 19 with diverse G3 substitution. Such amines of 16 or 19 can be utilized in the synthesis of compounds of formulae of 20 to 22. Synthetic procedures described in
Compounds of formula 25 can be attained from 16 where X'" is -NH2, via displacement reaction of a commercially available substituted pyrimidine, pyridine or a phenyl substituted precursor (23). Reduction of the resulting displacement product followed by cyclization with a desired R8 substituted carboxylic acid or aldehyde result in the compounds of formula 25. Alternatively, compounds of 25 can be prepared via a copper mediated N-arylation reaction of 26 and an appropriately functionalized heterocycle as 27 (
Compounds of formulae 31 and 32 can be made from 29 where X" is a group selected from Br, I or triflate, utilizing the earlier described procedures (
Preparation of compounds of 34 from intermediate 33 may be attained by utilizing the procedures described before (
Methods of preparation of compounds of the present disclosure described in schemes 2 to 8 delineate the synthesis of phosphorus esters, protected with R' group. Such R' group may be selected from alkyl, allyl, aryl or benzyl substituents. These esters may be deprotected to compounds of Formula I in conditions described for compounds of formula 5 from 4 in scheme 1.
The inhibition of DGAT-1 activity can be assessed in intestinal microsome preparations by monitoring the incorporation of radiolabeled fatty acyl-CoA into DAG.
Methods: Commercial microsomal preparations containing 60 ug of protein are incubated in assay buffer [20 uM 1,2-didecanloyl glycerol, 5 uM 14C decanoyl-CoA, 5 mM MgCl2, 0. 4 % BSA, 0.1% dimethyl sulfoxide (DMSO), 50 mM HEPES-pH 7.5] in the presence of varying concentrations of inhibitors that are dispensed from 100% DMSO stock solutions. Final assay volumes are 200 uL. Reactions are carried out for 45 minutes in 96-well polystyrene microtiter plates at ambient temperature. Following the ambient temperature incubation, assay mixtures are applied to a 96-well filter plate (Catalog # MSHVN4510, Millipore Inc.; Billerica, MA) under vacuum. The filter plate is pre-equilibrated with 100 uL of 70 % ethanol followed by 200 uL of assay buffer. Filters are dried, removed and placed in scintillation vials with 4 mL of scintillation cocktail (Catalog # 6013329; PerkinElmer Inc.; Waltham, MA). De novo 14C-TAG formed in the assay and trapped on the filters is quantified with use of a liquid scintillation counter (Model # LS6500 Beckman Coulter, Inc.; Fullerton, CA). The IC50 is defined as the concentration of compound that results in a 50% reduction in TAG synthesis.
'B' represents IC50 value between 10 and 100 nM
'C' represents IC50 value between 100 and 1000 nM
The following screen can be used to evaluate the effects of DGAT-1 inhibitors on the export of dietary TAGs from the intestine to the circulation in rodents (male Sprague Dawley rats or C57BL/6 mice).
Methods: Animals (housed 2/cage) are fasted overnight, and dosed (PO) the next day with vehicle (1% Tween-80) or test compound at doses ranging from 0.01 to 30 mg/kg, followed by an oral gavage of olive oil. Blood samples are taken at baseline and at appropriate intervals over the course of 4 hours. Serum TAG levels are determined using the Infinity triglyceride reagent per the manufacturer's instructions.
Results: Compounds 1, 2, and 5 reduced the AUC0-4h of serum TAGs following oral administration to Sprague Dawley rats at doses in the range of 0.1 to 30 mg/kg. These results confirm inhibition of enterocyte DGAT-1 by the compounds tested.
Pharmacokinetic studies in rats are useful for the identification of DGAT-1 inhibitors that have low oral bioavailability and show low systemic exposure (i.e. low circulating levels in plasma).
Methods: Groups of male Sprague Dawley rats (200-250 g) (n=3/group) were administered either an IV bolus (1% Tween-80, pH adjusted to 7, vehicle) or an oral gavage (50% PEG-200 in 1% Tween-80 vehicle) of 5 mg/kg of each DGAT-1 inhibitor. Blood (EDTA) was collected by tail nick at 0.5, 1, 2, 4, 8, 10-12 and 24 hr post dose. Following centrifugation of the blood to obtain plasma, the samples were analyzed by LC-MS/MS method for active metabolite. The pharmacokinetic parameters were calculated by noncompartmental analysis of the plasma concentration-time profile of the active metabolite. The oral bioavailability was determined by dividing the dose-normalized plasma AUC value of the active metabolite following oral administration of the DGAT-1 inhibitor by the plasma AUC value of the active metabolite after IV bolus administration.
Results: A summary of the key plasma pharmacokinetic parameters of the DGAT-1 inhibitors evaluated is shown in the table below. Compounds of the disclosure that were tested have low oral bioavailability, <10%, and low systemic exposure as indicated by a Cmax < 0.01 ug/mL. In contrast, known DGAT inhibitors X, Y, and Z were found to have high oral bioavailability and high plasma exposure.
2 Compound X, Compound 2 of
The following assay can be used to evaluate the anorectic efficacy of DGAT-1 inhibitors rodents (male Sprague Dawley rats or C57BL/6 mice).
Methods: Animals (rats housed 1/cage, or mice housed 2/cage) are fasted overnight. The next morning, animals are dosed (PO) with vehicle (1% Tween-80) or test compound (doses ranging from 0.1 to 30mg/kg). Food is then presented immediately following vehicle or compound administration. Food is weighed manually at 1-3 hour intervals to determine any inhibitory effects on food intake.
Results: Compounds of the disclosure reduced food intake significantly following oral administration at doses ranging from 0.1 to 30 mg/kg.
The following procedure may be used to evaluate the effect of test compounds on gut hormone (e.g., PYY, GLP1, CCK, etc) secretion in rodents.
Methods: Animals (male Sprague Dawley rats or C57BL/6 mice) in a fed or fasted state are orally gavaged with a nutrient load (oil, carbohydrate, and/or protein) immediately following administration of vehicle or test compound (doses ranging from 0.01 - 30mg/kg). Baseline and temporal bleeds are taken to determine serum concentrations of gut hormones of interest using commercially available ELISA/RIA kits as per the manufacturer's instructions.
Results: Administration of compounds of the disclosure to rodents at doses ranging from 0.1 to 30 mg/kg results in an increase in one or more gut hormones in plasma.
The effects of DGAT-1 inhibitors on body weight and adiposity can be assessed in standard animal models of obesity such as the high-fat fed mouse or rat.
Methods: Mice (diet-induced obese male, C57BL/6) that have been fed a high fat diet for >12 weeks are sham-dosed bid with water until acclimated to dosing (as determined by stable or steadily increasing body weights). Thereafter, vehicle (1% Tween-80) or test compound (doses ranging from 0.3 - 30 mg/kg) are dosed (PO, bid) daily for up to 28 days. Food intake and body weights are monitored daily to determine anorectic and weight loss efficacy. At the end of the study, lean and fat mass can be assessed by NMR.
Results: Compounds of the disclosure significantly reduce body weight and adiposity after daily administration at doses ranging from 0.1 to 30 mg/kg for several days to several weeks.
The insulin tolerance test was developed to evaluate insulin sensitivity in humans and in animal models (
Methods: DIO mice or rats that were subchronically or acutely treated with vehicle or test compound (doses ranging from 0.1- 30mg/kg) are fasted for up to 14 hours and are injected (i.p., 1U/kg) with Humalog (a fast-acting insulin analog). The temporal profile of blood glucose levels is monitored using One-Touch glucometers for up to 3 hours post-injection.
Results: Compounds of the disclosure improve insulin sensitivity after one or multiple weeks of dosing when administered at doses ranging from 0.1 to 30 mg/kg/day to DIO mice or rats. This is evident from the lower glucose levels following insulin administration in the treated versus the control animals.
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