[(2S,3S)-3-((R)-1-Allyloxycarbonyloxy-ethyl)-2-((S)-1-fluoro-1-methyl-2-oxo-2-phenyl-ethyl)-4-oxo-azetidin-1-yl]-oxo-acetic acid allyl ester 在
亚磷酸三乙酯 作用下,
以
xylene 为溶剂,
以53%的产率得到(4R,5S,6S)-6-((R)-1-Allyloxycarbonyloxy-ethyl)-4-fluoro-4-methyl-7-oxo-3-phenyl-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester