A penicillin sulfoxide ester is reacted with an N-chloro halogenating agent at a temperature of from about 75.degree. C. to about 135.degree. C. to produce a novel 2-chlorosulfinylazetidin-4-one intermediate. The intermediate can be treated with stannic chloride to produce a 3-exomethylenecepham sulfoxide.
一种
青霉素亚砜酯与N-
氯卤化试剂在温度为约75℃至约135℃的条件下反应,产生一种新型的2-
氯亚砜基氮杂环
丙酮中间体。该中间体可以经过
氯化锡的处理,生成一种3-外向亚甲基头孢烯亚砜醚。