A process for producing enantiomerically enriched (S)-α-(2-chlorophenyl)-6,7-dihydrothieno[3,2-c]pyridine-5 (4H)-acetic acid hydrocarbyl ester, represented by the formula:
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)-α,α-(2-thiophenylethylamino) (2-chlorophenyl) acetonitrile; (b) contacting the enantiomerically enriched (s)-α,α-(2-thiophenylethylamino) (2-chlorophenyl) acetonitrile and a formaldehyde equivalent, in the presence of an acid catalyst to form enantiomerically enriched α-5 (4,5,6,7-tetrahydro[3,2-c] thienopyridyl) (2-chlorobenzyl)-nitrile; and (c) contacting the enantiomerically enriched α-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)-α-(2-chlorophenyl)-6,7-dihydrothieno-[3,2-c]pyridine-5(4H)-acetic acid.
一种生产对映体富集的(S)-α-(2-
氯苯基)-
6,7-二氢噻吩并[3,2-c]吡啶-5 (4H)-
乙酸烃基酯的工艺,由式表示:
提供,其中 R
1
和 R
2
是氢,R
3
为甲基(即 (S)-
氯吡格雷)。该工艺包括以下步骤(a) 在非
金属不对称 Strecker 催化剂存在下,将 N-
2-氯苯甲醛亚基-1-
乙胺-2 (2-
噻吩基)
亚胺和 HCN 源接触,形成对映体富集的 (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,将对映体富集的(s)-α,α-(2-
噻吩基乙基
氨基)(2-
氯苯基)
乙腈与
甲醛当量接触,形成对映体富集的α-5 (4,5,6,7-四氢[3,2-c]
噻吩吡啶基)(2-
氯苄基)-腈;(c) 将对映体富集的α-5(4,5,6,7-四氢[3,2-c]
噻吩吡啶基)(2-
氯苄基)-腈与能够将
氰基转化为酯基的试剂接触,形成(S)-α-(2-
氯苯基)-
6,7-二氢噻吩并[3,2-c]吡啶-5(4H)-
乙酸的对映体富集的烃基酯。