申请人:Rhodia ChiRex, Inc.
公开号:US20040214878A1
公开(公告)日:2004-10-28
A process for producing enantiomerically enriched (S)-&agr;-(2-chlorophenyl)-6,7-dihydrothieno[3,2-c]pyridine-5(4H)-acetic acid hydrocarbyl ester, represented by the formula:
1
Is provided, wherein R
1
and R
2
are hydrogens and R
3
is methyl (i.e., (S)-Clopidogrel). The process includes the steps of: (a) contacting N-2-chlorobenz-aldehyde-ylidene-1-ethylamine-2(2-thiophenyl)imine and an HCN source, in the presence of a non-metallic asymmetric Strecker catalyst to form enantiomerically enriched (S)-&agr;,&agr;-(2-thiophenylethylamino)(2-chlorophenyl)acetonitrile; (b) contacting the enantiomerically enriched (S)-&agr;,&agr;-(2-thiophenylethylamino)(2-chlorophenyl)acetonitrile and a formaldehyde equivalent, in the presence of an acid catalyst to form enantiomerically enriched &agr;-5(4,5,6,7-tetrahydro[3,2-c]thienopyridyl)(2-chlorobenzyl)-nitrile; and (c) contacting the enantiomerically enriched &agr;-5(4,5,6,7-tetrahydro[3,2-c]thienopyridyl)(2-chlorobenzyl)-nitrile and a reagent capable of converting a cyano group into an ester group to form enantiomerically enriched hydrocarbyl ester of (S)-&agr;-(2-chlorophenyl)-6,7-dihydrothieno-[3,2-c]pyridine-5(4H)-acetic acid.
提供一种生产对映富集的(S)-α-(2-氯苯基)-6,7-二氢噻吩[3,2-c]吡啶-5(4H)-乙酸烃基酯的方法,其化学式为:1,其中R1和R2为氢,R3为甲基(即(S)-氯吡格雷尔)。该方法包括以下步骤:(a) 在非金属不对称Strecker催化剂存在下,将N-2-氯苯甲醛-1-乙胺基-2(2-噻吩基)亚胺与HCN源接触,形成对映富集的(S)-α,α-(2-噻吩基乙基氨基)(2-氯苯基)乙腈;(b) 在酸催化剂存在下,将对映富集的(S)-α,α-(2-噻吩基乙基氨基)(2-氯苯基)乙腈与甲醛当量接触,形成对映富集的α-5(4,5,6,7-四氢[3,2-c]噻吩基)(2-氯苯基)腈;(c) 将对映富集的α-5(4,5,6,7-四氢[3,2-c]噻吩基)(2-氯苯基)腈与能够将氰基转化为酯基的试剂接触,形成对映富集的(S)-α-(2-氯苯基)-6,7-二氢噻吩[3,2-c]吡啶-5(4H)-乙酸烃基酯。