1-甲基-2-吡啶酮 、 (E)-2-Diazo-pent-3-enoic acid (S)-1-ethoxycarbonyl-ethyl ester 在
tetrakis[N-(4-tert-butylphenylsulfonyl)prolinato]dirhodium 作用下,
以
甲苯 为溶剂,
生成 (1R,2R,5S)-2,6-Dimethyl-7-oxo-6-aza-bicyclo[3.2.2]nona-3,8-diene-4-carboxylic acid (S)-1-ethoxycarbonyl-ethyl ester 、
(1S)-2-ethoxy-1-methyl-2-oxoethyl 2α,6-dimethyl-6-azabicyclo[3.2.2]nona-3,8-diene-7-one-4-carboxylate