(2S,5R)-6-[1-tert-Butoxycarbonyl-meth-(Z)-ylidene]-3,3-dimethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid tert-butyl ester 在
间氯过氧苯甲酸 作用下,
以27%的产率得到(2S,5R)-6-[1-tert-Butoxycarbonyl-meth-(Z)-ylidene]-3,3-dimethyl-4,4,7-trioxo-4λ
6-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid tert-butyl ester