[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF (3R,4R)-(1-BENZYL-4-METHYLPIPERIDIN-3-YL)-METHYLAMINE<br/>[FR] PROCEDE AMELIORE POUR LA PREPARATION DE (3R,4R)-(1-BENZYL-4-METHYLPIPERIDIN-3YL)-METHYLAMINE
申请人:UNICHEM LAB LTD
公开号:WO2015087201A1
公开(公告)日:2015-06-18
The present invention is related to an improved and efficient process for preparation of (3R,4R)-(1-benzyl-4-methylpiperidin-3-yl)-methylamine which comprises: (a) N-acylation of 3-Amino-4-methyl pyridine; (b) Quarternization of 3-Acetylamino-4- methyl pyridine using benzyl halide; (c) Partial reduction of quarternized 3-Acetylamino- 4-methyl pyridine by Sodium borohydride in Methanol or water; (d) Hydrolysis of partially reduced product to 1-Benzyl-4-methylpiperidin-3-one in presence of acid; (e) Reductive animation of 1-Benzyl-4-methylpiperidin-3-one using Methanolic methylamine in presence of Titanium(IV) isopropoxide in Methanol; (f) Resolution of 1-Benzyl-4- methylpiperidin-3-yl)-methylamine using Ditoluoyl (L) tartaric acid to get (3R,4R)-(1- benzyl-4-methylpiperidin-3-yl)-methylamine. The invention is also related to novel intermediates.
3-Amino-piperadine derivatives and methods of manufacture
申请人:Pfizer Inc.
公开号:US20040102627A1
公开(公告)日:2004-05-27
This invention relates to 3-amino piperadine derivatives, their intermediates and methods of manufacture. As such, the present invention includes methods of making a compound of the formulas (Ia) and (Ib)
1
wherein R
1
, R
2
, R
3
, R
4
, R
14
, and n are herein defined. The present invention also relates to the compounds used in such processes, as well as the compounds made by the processes.
[EN] PROCESSES FOR PREPARING (3R,4R)-1-BENZYL-N,4-DIMETHYLPIPERIDIN-3-AMINE OR A SALT THEREOF AND PROCESSES FOR PREPARING TOFACITINIB USING THE SAME<br/>[FR] PROCÉDÉS DE PRÉPARATION DE (3R,4R)-1-BENZYL-N,4-DIMÉTHYLPIPÉRIDIN-3-AMINE OU D'UN SEL DE CELUI-CI ET PROCÉDÉS DE PRÉPARATION DE TOFACITINIB L'UTILISANT
申请人:YUHAN CORP
公开号:WO2020204647A1
公开(公告)日:2020-10-08
The present invention provides a novel process for preparing (3R,4R)-1-benzyl-N,4-dimethylpiperidin-3-amine or a salt thereof, which is an intermediate useful for the preparation of tofacitinib. The present invention also provides a novel intermediate used in the process, i.e., isopropanol solvate of methyl ((3R,4R)-1-benzyl-4-methylpiperidin-3-yl)carbamate dibenzoyl-L-tartrate. The present invention also provides a novel intermediate, having excellent stability, useful for the preparation of tofacitinib, i.e., (3R,4R)-1-benzyl-N,4-dimethylpiperidin-3-amine acetate. In addition, the present invention provides a process for preparing tofacitinib or a pharmaceutically acceptable salt thereof using the process.
[EN] TRICYCLIC HETEROCYCLIC COMPOUNDS AND JAK INHIBITORS<br/>[FR] COMPOSÉS HÉTÉROCYCLIQUES TRICYCLIQUES ET INHIBITEURS DE JAK
申请人:NISSAN CHEMICAL IND LTD
公开号:WO2013024895A1
公开(公告)日:2013-02-21
Novel tricyclic pyrimidine compounds and tricyclic pyridine compounds having JAK inhibitory activities are provided. A tricyclic heterocyclic compound represented by the formula (Ia): wherein the rings Aa and Ba, Xa, Ya, R1a, R2a, R3a, L1a, L2a, L3a and na are as defined in the description.