Global Patent Index - EP 1025084 A1

EP 1025084 A1 2000-08-09 - METHOD FOR PURIFYING 4-AMINO-PIPERIDINES

Title (en)

METHOD FOR PURIFYING 4-AMINO-PIPERIDINES

Title (de)

VERFAHREN ZUR REINIGUNG VON 4-AMINO-PIPERIDINEN

Title (fr)

PROCEDE DE PURIFICATION DE 4-AMINO-PIPERIDINES

Publication

EP 1025084 A1 (DE)

Application

EP 98951469 A

Priority

  • DE 19743433 A
  • EP 9806117 W

Abstract (en)

[origin: DE19743433C1] The invention relates to a method for purifying 2,2,6,6-tetrasubstituted 4-amino-piperidines produced from the corresponding piperidin-4-ones, and subsequent distillation. According to the invention, the distilled 2,2,6,6-tetrasubstituted 4-amino-piperidine is reacted with hydrogen in the presence of a hydrating or dehydrating catalyst and the 4-amino piperidine is then separated from the reaction mixture.

IPC 1-7 (main, further and additional classification)

C07D 211/58

IPC 8 full level (invention and additional information)

C07D 211/58 (2006.01)

CPC (invention and additional information)

C07D 211/58 (2013.01)

Citation (search report)

See references of WO 9916749A1

Designated contracting state (EPC)

AT BE CH DE ES FR GB GR IE IT LI NL PT

EPO simple patent family

DE 19743433 C1 19990422; AU 9746998 A 19990423; BR 9812595 A 20000801; CA 2305282 A1 19990408; CN 1272843 A 20001108; CO 4770994 A1 19990430; EP 1025084 A1 20000809; HU 0004584 A2 20010428; ID 23897 A 20000525; JP 2001518465 A 20011016; NZ 503565 A 20010928; PL 339578 A1 20001218; SK 4262000 A3 20001009; WO 9916749 A1 19990408

INPADOC legal status


2002-07-03 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Date of withdrawal: 20020510

2002-02-13 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20020103

2000-08-09 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000323

2000-08-09 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH DE ES FR GB GR IE IT LI NL PT