申请人:Shionogi & Co., Ltd.
公开号:US04160085A1
公开(公告)日:1979-07-03
Intermediates represented by the following formulas are useful for synthesizing 3-hydroxy-3-cephem compounds ##STR1## wherein A and B each is a hydrogen or amino substituent; R is a hydrogen or thiol substituent; Hal is a halogen; X is a hydroxy or carboxy protecting group; the broken line between A and R shows that when R and B are hydrogens, and A is a carboxylic acyl, the substituents can be combined to form an azetidinothiazoline bicyclic ring; and the enamine derivatives thereof. One embodiment provides for cyclizing a compound of the formula: ##STR2## wherein A, B, X and Hal are as defined above, which comprises treating the said compound with an acid, base, or solvent if required in the presence of a catalyzer to give a compound represented by following formula ##STR3## In a further embodiment a compound represented by the following formula ##STR4## wherein A, B, R and X are as defined above, is prepared by a process which comprises treating an enamine of a compound represented by following formula ##STR5## wherein A, B, R, X, Hal and broken line are as defined above, with a disubstituted amino containing from 2 to 20 carbon atoms, with the action of an aqueous acid.
以下式子代表的中间体在合成3-羟基-3-头孢烷化合物时非常有用:##STR1## 其中A和B均为氢或氨基取代基;R为氢或硫醇取代基;Hal为卤素;X为羟基或羧基保护基;A和R之间的断裂线表示当R和B为氢,A为羧酸酰基时,取代基可以结合形成氮杂环硫唑双环环;以及其烯胺衍生物。一种实施例提供了将以下式子的化合物环化:##STR2## 其中A、B、X和Hal如上所定义,包括在催化剂存在下,用酸、碱或必要的溶剂处理所述化合物,以给出以下式子所代表的化合物:##STR3## 在另一种实施例中,通过将以下式子所代表的烯胺与含有2至20个碳原子的二取代氨基化合物在水酸的作用下处理,制备出以下式子所代表的化合物:##STR4## 其中A、B、R和X如上所定义。