PROCESS FOR PREPARING ESTERS OF PENICILLANIC ACID SULFONE

摘要

A process for preparing halomethyl esters of penicillanic acid sulfone, intermediates to beta-lactamase inhibitors, from the corresponding substituted thiomethyl and sulfinylmethyl esters and a halogenating agent. The thiomethyl and sulfinylmethyl esters of penicillanic acid sulfone are useful intermediates.