A penicillin S-oxide is rearranged into the corresponding desacetoxycephalosporin compound by heating said penicillin S-oxide at a temperature of from 70 to 140.degree.C in the presence of a sulfoxide of formula R.sup.1 -SO-R.sup.2, preferably dimethyl sulfoxide, or a sulfonium or sulfoxonium salt of said sulfoxyde or a mixture of said sulfoxide and said sulfonium or sulfoxonium salt. The sulfoxide may act as reaction medium as well as reactant or an inert organic solvent may be used as a reaction medium.
一种
青霉素S-
氧化物可以通过在温度为70到140°C的条件下,在R1-SO-R2的亚磺酰
氧化物(优选为二
甲基亚磺酰
氧化物)或该亚磺酰
氧化物的磺鎓盐或亚磺鎓盐或该亚磺酰
氧化物和该磺鎓盐或亚磺鎓盐的混合物的存在下加热,使该
青霉素S-
氧化物重排成相应的
脱乙酰
头孢菌素化合物。该亚磺酰
氧化物可以作为反应介质和反应物,或者可以使用惰性有机溶剂作为反应介质。