tert.-butyl 4-<3(R)-benzoylamino-2-azetidinon-4(R)-yloxy>-2-diazo-3-oxo-butanoate 在
汞 氮 、 silica gel 、
toluene-ethyl acetate 作用下,
以
Benzene tetrahydrofuran 为溶剂,
反应 1.0h,
以12 mg (17%) of the title compound were obtained as a colorless rigid foam的产率得到tert.-butyl (6R,7R)-7-benzoylamino-3-hydroxy-8-oxo-5-oxa-1-azabicyclo<4.2.0>oct-2-ene-2-carboxylate