[EN] PROCESS FOR THE PREPARATION OF TETRAHYDROTHIENO [3,2-C] PYRIDINE DERIVATIVES<br/>[FR] PROCEDE DE PREPARATION DE DERIVES DE TETRAHYDROTHIENO[3,2-C]PYRIDINE
申请人:BRANTFORD CHEM INC
公开号:WO2003004502A1
公开(公告)日:2003-01-16
A process for the preparation of tetrahydrothieno[3,2-c]pyridine derivatives of general formula (I), or their pharmaceutically acceptable salts, wherein the meaning of X is hydrogen, carboxyl, alkoxycarbonyl, aryloxycarbonyl, nitrile, or carbamoyl of formula (a) wherein R1 and R2 can be individually or simultaneously hydrogen, alkyl or part of a heterocyclic structure; Z can be hydrogen, halogen, alkyl, aryl, aryloxy or alkoxy group comprising the steps of: (a) reducing the compound of formula (II) with suitable reducing agents to obtain compound of formula (III), (b) reacting the compound of formula (III) with formaldehyde or any chemical equivalent thereof to obtain compound of formula (IV), (c) rearranging the compound of formula (IV) to produce the compound of formula (V), wherein Y is hydroxyl, alkanoyloxy, aroyloxy, carbamate or carbonate derivatives, and (d) reducing the compound of formula (V) to compound of formula (I).