[EN] PROCESS FOR THE PREPARATION OF 1-(MERCAPTOMETHYL)-CYCLOPROPANEACETIC ACID<br/>[FR] PROCESSUS DESTINE A LA PREPARATION D'ACIDE 1-(MERCAPTOMETHYL)-CYCLOPROPANE-ACETIQUE
申请人:DELMAR CHEMICALS INC
公开号:WO2003066582A1
公开(公告)日:2003-08-14
A process for the preparation of highly pure 1-(mercaptomethyl)-cyclopropaneacetic acid is described. Treatment of 1-(hydroxymethyl)-cyclopropaneacetonitrile with an acid provides the corresponding imino ester and/or halo-amide, which when reacted with thiourea provides the corresponding amide-isothiuronium salt. Hydrolysis of the amide-isothiuronium salt followed by an in situ oxidation allows the facile isolation and purification of 1-[1-(carboxymethyl)-cyclopropanemethyldisulfanylmethyl]-cyclopropaneacetic acid (also known as 1-(mercaptomethyl)-cyclopropaneacetic acid disulfide). Reduction of the 1-(mercaptomethyl)-cyclopropaneacetic acid disulfide under mild conditions provides the 1-(mercaptomethyl)-cyclopropaneacetic acid with high purity.