t-butyl (1RS,5SR,7RS,8SR)-8-ethoxycarbonyl-8-methylsulphonyloxy-3-oxo-2-oxa-6-azabicyclo<3.3.0>octane-7-carboxylate 在
lead(IV) acetate 作用下,
以
二氯甲烷 为溶剂,
反应 12.0h,
以47%的产率得到t-butyl (1RS,5SR,8SR)-8-ethoxycarbonyl-8-methylsulphonyloxy-3-oxo-2-oxa-6-azabicyclo<3.3.0>oct-6-ene-7-carboxylate