The invention relates to a new process for the preparation of N-sulfamyl-3-(2-guanidinothiazol-4-yl-methylthio)-propionitrile (famotidine) of the formula (I) ##STR1## by S-alkylation of 2-guanidino-thiazol-4-yl-methanethiol obtained from S-(2-guanidino-thiazol-4-yl-methyl)-isothiourea dihydrochloride of the formula (III) ##STR2## by in situ treatment with a base, which comprises carrying out S-alkylation with a N-sulfamyl-3-halopropionamidine of the formula (II) ##STR3## wherein X stands for halogen.
本发明涉及一种新的制备N-磺酰基-3-(2-
胍基
噻唑-4-基甲
硫基)-
丙腈(famotidine)的方法,其
化学式为(I) ##STR1## 通过从
化学式(III)中获得的S-(2-
胍基
噻唑-4-基甲基)-异
硫脲二盐酸盐,通过原位处理碱,进行S-烷基化反应,其中所述S-烷基化反应使用
化学式(II)中的N-磺酰基-3-卤代丙酰
胍,其
化学式为(II) ##STR3## 其中X代表卤素。