申请人:Ciba-Geigy Corporation
公开号:US04319027A1
公开(公告)日:1982-03-09
The invention concerns a process for the manufacture of 7.beta.-amino-3-cephem-3-ol-4-carboxylic acid compounds by ring closure of esters of 2-[4-(substituted-thio)-3-acylamino-2-oxoazetidin-1-yl]-3-substituted-amin o-crotonic acids and solvolysing the enamino group in the resulting 7.beta.-acylamino-3-substituted-amino-cephem-4-carboxylic acid esters.
本发明涉及一种通过酯环合成2-[4-(取代
硫)-3-酰基
氨基-2-氧代氮杂
丙烯-1-基]-3-取代
氨基-
酪酸和溶剂裂解所得的7.beta.-酰基
氨基-3-取代
氨基-头孢-4-
羧酸酯的制备过程。