[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF BACLOFEN AND ITS INTERMEDIATE [FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE BACLOFÈNE ET DE SON INTERMÉDIAIRE
AN IMPROVED PROCESS FOR THE PREPARATION OF BACLOFEN AND ITS INTERMEDIATE
申请人:Piramal Enterprises Limited
公开号:EP3322691A1
公开(公告)日:2018-05-23
PROCESS FOR THE PREPARATION OF BACLOFEN AND ITS INTERMEDIATE
申请人:PIRAMAL PHARMA LIMITED
公开号:US20210171442A1
公开(公告)日:2021-06-10
The present invention provides an improved process for the preparation of 3-(4-chlorophenyl)-3-cyanopropanoic acid (compound (A)) and further its transformation to Baclofen (I). The process comprises reaction of compound (II) with Glyoxylic acid to obtain 3-(4-chlorophenyl)-3-cyanoacrylic acid (III); followed by the ‘in-situ’ reduction of (III) in the presence of a reducing agent to provide the compound (A).
Alternatively, the compound (A) is obtained by the process comprising reacting 2-(4-chlorophenyl)acetonitrile (II) with haloacetic acid (IV) in the presence of a base.
The compound 3-(4-chlorophenyl)-3-cyanopropanoic acid (A) undergoes hydrogenation in the presence of a metal catalyst and ammonia solution to provide Baclofen (I).