[EN] METHOD FOR PREPARING BRIVARACETAM AND INTERMEDIATES THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION DE BRIVARACÉTAM ET SES INTERMÉDIAIRES<br/>[ZH] 布瓦西坦的制备方法及其中间体
[EN] PREPARATION METHOD FOR BRIVARACETAM AND INTERMEDIATE THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION DE BRIVARACÉTAM ET DE SON INTERMÉDIAIRE<br/>[ZH] 布瓦西坦的制备方法及其中间体
PROCESS FOR THE PREPARATION OF (R)-4-PROPYL PYRROLIDINE-2-ONE, A KEY INTERMEDIATE FOR SYNTHESIS OF BRIVARACETAM
申请人:DIVI'S LABORATORIES LTD.
公开号:US20230373914A1
公开(公告)日:2023-11-23
A process for the preparation of (R)-4-propyl-pyrrolidine-2-one, is provided which includes enzymatic conversion of dimethyl 3-propyl pentanedioate selectively into (S)-3-(2-methoxy-2-oxoethyl) hexanoic acid using Novozyme's Promea® enzyme, amidation of (S)-3-(2-methoxy-2-oxoethyl) hexanoic acid, followed by ester hydrolysis to obtain (S)-3-(2-amino-2-oxoethyl) hexanoic acid having high chiral purity>99% and converting the amide to amine by Hofmann rearrangement and cyclization resulting in (R)-4-propyl-pyrrolidine-2-one. It is further converted to Brivaracetam by N-alkylation with 2-bromobutyric acid, esterification followed by enzymatic resolution.