(6R,7R)-7-{[1-(2-Hydroxy-phenyl)-meth-(E)-ylidene]-amino}-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2,2,2-trichloro-ethyl ester 在
间氯过氧苯甲酸 作用下,
以
四氢呋喃 为溶剂,
生成 (5R,6R,7R)-7-{[1-(2-Hydroxy-phenyl)-meth-(E)-ylidene]-amino}-3-methyl-5,8-dioxo-5λ
4-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2,2,2-trichloro-ethyl ester