(1S,5S,7R,8R)-8-Methanesulfonyloxy-3-oxo-2-oxa-6-aza-bicyclo[3.2.1]octane-1,7-dicarboxylic acid 7-tert-butyl ester 1-ethyl ester 在
lead(IV) acetate 作用下,
以
二氯甲烷 为溶剂,
以47%的产率得到(1S,5S,8R)-8-Methanesulfonyloxy-3-oxo-2-oxa-6-aza-bicyclo[3.2.1]oct-6-ene-1,7-dicarboxylic acid 7-tert-butyl ester 1-ethyl ester