t-butyl (1SR,5SR,7RS,8RS)-1-ethoxycarbonyl-8-hydroxy-2-oxa-6-azabicyclo<3.2.1>octane-7-carboxylate 、
甲基磺酰氯 以
吡啶 为溶剂,
以48%的产率得到(1R,5R,7S,8S)-8-Hydroxy-6-methanesulfonyl-3-oxo-2-oxa-6-aza-bicyclo[3.2.1]octane-1,7-dicarboxylic acid 7-tert-butyl ester 1-ethyl ester