3'-Bromo-substituted deacetoxycephalosporanic acid sulphoxide derivatives are prepared by silylating the carboxy group (in order to protect same) of a 3'-unsubstituted deacetoxycephalosporanic acid sulphoxide derivative in an inert anhydrous organic solvent, and then brominating the resulting silyl ester of the deacetoxycephalosporanic acid sulphoxide in situ.
3'-
溴取代的脱乙酰氧基头孢烷酸亚砜衍
生物的制备方法是:在惰性无
水有机溶剂中对 3'- 未取代的脱乙酰氧基头孢烷酸亚砜衍
生物的羧基进行
硅烷化(以保护羧基),然后在原位
溴化得到的脱乙酰氧基头孢烷酸亚砜
硅烷酯。