申请人:Desitin Arznemittel GmbH
公开号:US04966996A1
公开(公告)日:1990-10-30
A novel process for the preparation of E-2-propyl-2-pentenoic acid, as well as the physiologically compatible salts thereof is described, in which 2-bromo-2-propyl-pentenoic acid ethyl ester is used as the starting compound. The bromine is split off with a cyclic tertiary amine in acetonitrile as the solvent and preferably the E-isomer of the ethyl ester is formed. The free acid is obtained by subsequent saponification under careful conditions and optionally, preferably using the corresponding carbon dioxide salts in aqueous acetone solution, is converted into the salt form.
描述了一种制备E-2-丙基-2-戊烯酸及其生理兼容盐的新型工艺,其中以2-溴-2-丙基-戊烯酸乙酯作为起始化合物。溴在乙腈中与环状三级胺分离,最好形成乙酸乙酯的E-异构体。通过在谨慎条件下随后的皂化反应获得游离酸,并且可选地,最好使用相应的二氧化碳盐在水合丙酮溶液中将其转化为盐形式。