An improvement, in per se know method for producing 7-aminocephem compound being important intermediate for producing antimicrobial substances, represented by the formula:
wherein R' is a hydrogen atom or a methoxy group and R2 is a residue of a thiol compound, or a salt or ester thereof, by reacting a compound of the formula:
wherein R' is as defined above and R is a carboxylic acid acyl group, or a salt or ester thereof, with a thiol compound or a salt thereof, is characterized in that the reaction is conducted in an organic solvent in the presence of a dihalophosphoric acid to give the compound [II] in high yield and high purity.
一种改进的、本身已知的生产 7-
氨基cephem化合物的方法,该化合物是生产抗菌物质的重要中间体,由式表示: 式中 R'是氢原子或甲氧基,R2是
硫醇化合物的残余物,或其盐或酯,通过使式中: 式中 R'如上定义,R是
羧酸酰基,或其盐或酯的化合物与
硫醇化合物或其盐反应,其特征在于该反应是在有机溶剂中,在二卤
磷酸存在下进行的,以高产率和高纯度得到化合物[II]。