Process for the preparation of 2,5-bis-(2,2,2-trifluoroethoxy)-N-(2-piperidylmethyl)-benzamide (FLECAINIDE)
申请人:——
公开号:US20030032835A1
公开(公告)日:2003-02-13
Process for the synthesis of FLECAINIDE comprising the reaction between 2,5-dihydroxybenzoic acid with trifluoroethanol perfluorobutanesulphonate to give the intermediate trifluoroethanol 2,5-bis-trifluoroethoxybenzoate, the reaction of said intermediate with 2-aminomethylpiperidine to give FLECAINIDE.
Process for the preparation of 2,5-bis-(2,2,2-trifluoroethoxy)-n-(2-piperidyl-methyl)-benzamide (flecanide)
申请人:A.M.S.A. ANONIMA MATERIE SINTETICHE E AFFINI S.p.A.
公开号:EP1283201A1
公开(公告)日:2003-02-12
Process for the synthesis of FLECAINIDE comprising the reaction between 2,5-dihydroxybenzoic acid with trifluoroethanol perfluorobutanesulphonate to give the intermediate trifluoroethanol 2,5-bis-trifluoroethoxybenzoate, the reaction of said intermediate with 2-aminomethylpiperidine to give FLECAINIDE.
The invention describes an improved process for the manufacture of a Flecainide intermediate viz N-(pyridin-2-ylmethyl)-2,5-bis(2,2,2-trifluoroethoxy)benzamide (II). It consists of reacting 2,5-bis(2,2,2-trifluoroethoxy)benzoic acid with an acid chloride in a solvent mixture in presence of a base at −10 to −50° C. The resulting mixed anhydride is then condensed with 2-aminomethylpyridine at −10 to −40° C. and the resulting product after aqueous workup is purified by crystallization. This affords the intermediate II in vastly improved yields and quality. The intermediate II on catalytic hydrogenation affords N-(2-piperidinylmethyl)-2,5-bis(2,2,2-trifluoroethoxy)benzamide (Flecainide), isolated as its acetate.
An improved, highly efficient method for the preparation of flecainide acetate (I) or other pharmaceutically acceptable salts of flecainide. The method involves a technique for preparing the staring material 1,4-bis (2,2,2-trifuoroethoxy) benzene (III) in high yields by reacting 4-fluoro-1-bromobenzene (VI) with TFE in the presence of a base and a copper-containing catalyst.