{(2S,3S)-2-(4,6-Dimethyl-pyrimidin-2-ylsulfanylcarbonyl)-3-[(R)-1-(4-nitro-benzyloxycarbonyloxy)-ethyl]-4-oxo-azetidin-1-yl}-(triphenyl-λ
5-phosphanylidene)-acetic acid 4-nitro-benzyl ester 以
甲苯 为溶剂,
反应 3.0h,
以76%的产率得到(5R,6S)-3-(4,6-Dimethyl-pyrimidin-2-ylsulfanyl)-6-[(R)-1-(4-nitro-benzyloxycarbonyloxy)-ethyl]-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester