methyl (E)-(1'R
*,5'S
*)-3-tert.-butoxymethyl-4-(N,N-diisopropylcarbamoyloxy)-2-(7-oxo-3-phenyl-4-oxa-2,6-diazabicyclo<3.2.0>hept-2-en-6-yl)-2-butenoate 在
zinc chloride etherate 作用下,
以
二氯甲烷 为溶剂,
反应 15.0h,
以20%的产率得到methyl (1R
*,8R
*)-8-benzoylamino-4-(N,N-diisopropylcarbamoyloxymethyl)-7-oxo-2-oxa-6-azabicyclo<4.2.0>oct-4-en-5-carboxylate