A process for the preparation of the cephalosporanic antibiotics CEFOTAXIME and CEFTRIAXONE.
Said process consists in reacting 7-aminocephalosporanic acid (7-ACA) or 7-amino-3[(2,5-dihydro-6-hydroxy-2-methyl-5-oxo-as-triazin-3-yl]-3-cephem-4-carboxylic acid (7-ACT) with suitably activated 4-chloro-2-methoxyimino-3-oxobutyric acid, and subsequently cyclizing the intermediate chloromethoxyimino oxobutyramide with thiourea.
一种头孢类
抗生素 CEFO
TAXIME 和 CEFTRIAXONE 的制备工艺。
该工艺是将 7-
氨基
头孢菌素酸(
7-ACA)或 7-
氨基-3[(2,5-二
氢-6-羟基-
2-甲基-5-
氧代异三嗪-3-基]-3-头孢-4-
羧酸(7-ACT)与适当活化的 4-
氯-
2-甲氧基亚
氨基-
3-氧代丁酸反应,然后用
硫脲环化中间产物
氯甲氧基亚
氨基
氧代丁
酰胺。