(2S,4S,5R,6S)-6-Chloro-3,3-dimethyl-4,7-dioxo-4λ4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 2,2,2-trichloro-ethyl ester 在
dipyridinium phosphate 作用下,
以
various solvent(s) 为溶剂,
反应 1.0h,
以87.5%的产率得到(6R,7S)-7-Chloro-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2,2,2-trichloro-ethyl ester