PREPARATION OF 3'-BROMO-SUBSTITUTED DEACETOXY CEPHALOSPORANIC ACID SULPHOXIDE DERIVATIVES

摘要

3 min -Bromo-substituted deacetoxycephalosporanic acid sulphoxide derivatives are prepared by silylating the carboxy group (in order to protect same) of a 3 min -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.