There is described the preparation of halogenated ß-lactam derivatives by introduction of a chlorine atom in the 3-position of the cephem nucleus starting from a 3-sulfonyloxycephem. Such starting materials are reacted with a chlorine ions donor in a basic medium.
这里介绍了一种卤化 ß-内酰胺衍
生物的制备方法,即从 3-磺酰氧基头孢烷开始,在头孢烷核的 3 位引入一个
氯原子。这种起始材料在碱性介质中与
氯离子供体发生反应。