Penicillin sulfoxide esters are reacted with an isocyanate to produce the corresponding (substituted)-2-carbamoyloxymethylpenam, the corresponding (substituted)-3-carbamoyloxycepham or the corresponding 3-methylcepem. The 6- or 7-side-chain of these products may be cleaved to give the corresponding 6-amino (penams) or 7-amino (cephams and cephems) compounds, and the latter may be reacylated to produce different 6-acyl-2-carbamoyloxymethyl penams, 7-acyl-3-carbamoyloxy cephams and 7-acyl-3-methylcephems. The substituent groups may be removed from the (substituted)-2-carbamoyloxypenams or the (substituted)-3-carbamoyloxycephams to give the corresponding free 2-carbamoyloxymethylpenams or 3-carbamoyloxycephams, respectively.
青霉素磺酰氧酯与
异氰酸酯反应,得到相应的(取代)-2-
氨氧甲基青霉烯、相应的(取代)-3-
氨氧甲基
头孢菌素或相应的3-甲基头孢烯。这些产物的6-或7-侧链可被裂解,以得到相应的6-
氨基(青霉烯)或7-
氨基(
头孢菌素和头孢烯)化合物,后者可被重新酰化以产生不同的6-酰基-2-
氨氧甲基青霉烯、7-酰基-3-
氨氧甲基
头孢菌素和7-酰基-3-甲基头孢烯。取代基团可以从(取代)-2-
氨氧甲基青霉烯或(取代)-3-
氨氧甲基
头孢菌素中去除,以分别得到相应的自由2-
氨氧甲基青霉烯或3-
氨氧甲基
头孢菌素。