[EN] A PROCESS FOR PREPARATION OF CLOPIDOGREL<br/>[FR] PROCEDE DE PREPARATION DE CLOPIDOGREL
申请人:SUN PHARMACEUTICAL IND LTD
公开号:WO2004108665A2
公开(公告)日:2004-12-16
The present invention provides a process for the preparation of S-isomer of methyl α-(4,5,6,7-tetrahydro-5-thieno[3,2-c]pyridyl)(2-chlorophenyl)acetate, a compound of formula (4), or a salt thereof comprising, (a) resolving racemic α-[(2-thien-2-yl)ethylamino]-a-(2-chlorophenyl)methylacetate, a compound of formula 1 or a salt thereof to obtain S-isomer of a compound of formula (1) or a salt thereof and R-isomer of formula (1) or a salt thereof, (b) racemizing the R-isomer of formula 1 or a salt thereof to obtain a racemic compound of formula (1) and optionally converting it into a salt thereof, (c) optionally repeating steps 'a' and 'b', (d) converting the S-isomer of compound of formula (1) obtained in step 'a' to S-isomer of methyl α-(4,5,6,7-tetrahydro-5-thieno[3,2-c]pyridyl)(2-chlorophenyl) acetate.
本发明提供了一种制备式(4)化合物或其盐的甲基α-(4,5,6,7-四氢-5-硫杂[3,2-c]吡啶基)(2-氯苯基)乙酸S异构体的方法,包括:(a)分离外消旋α-[(2-噻吩-2-基)乙基]氨基-α-(2-氯苯基)甲基乙酸酯化合物(式1)或其盐,以获得式(1)或其盐的S异构体和R异构体,(b)消旋化式1或其盐的R异构体,以获得式1的外消旋化合物,并可选地将其转化为其盐,(c)可选地重复步骤“a”和“b”,(d)将步骤“a”中获得的式1的S异构体转化为式(4)化合物的S异构体。