t-butyl (1RS,5SR,7RS,8SR)-8-ethoxycarbonyl-8-hydroxy-3-oxo-2-oxa-6-azabicyclo<3.3.0>octane-7-carboxylate 、
甲基磺酰氯 在
吡啶 作用下,
反应 0.17h,
以48%的产率得到t-butyl (1RS,5SR,7RS,8SR)-8-ethoxycarbonyl-8-hydroxy-6-methylsulphonyl-3-oxo-2-oxa-6-azabicyclo<3.3.0>octane-7-carboxylate