(4S,5R,6S)-6-((R)-1-Hydroxy-ethyl)-3-hydroxymethyl-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester 、
[4-(Allyloxycarbonylamino-methyl)-benzoyl]-carbamic acid allyl ester 在
三苯基膦 、
偶氮二甲酸二乙酯 作用下,
以
甲苯 为溶剂,
反应 0.5h,
以22%的产率得到(4S,5R,6S)-3-({Allyloxycarbonyl-[4-(allyloxycarbonylamino-methyl)-benzoyl]-amino}-methyl)-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester