benzhydryl (6R,7R)-3-methyl-8-oxo-7-(2,2,2-trichloroethylideneamino)-5-oxa-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate 在
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
以91%的产率得到(R)-7-[(Z)-2,2-Dichloro-vinylimino]-3-methyl-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester