triethyloxonium fluoroborate 、 (1R,4R,5S,7S)-4,7-Diacetoxy-7-methyl-3-oxo-1-phenyl-2-aza-bicyclo[3.2.0]heptane-5-carboxylic acid ethyl ester 以
二氯甲烷 为溶剂,
反应 6.0h,
以92.6%的产率得到dl-(1R*,4R*,5S*,7S*)-4,7-diacetoxy-3-ethoxy-5-ethoxycarbonyl-7-methyl-1-phenyl-2-azabicyclo<3.2.0>hept-2-ene