((2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-{2-[4'-(tert-butyl-dimethyl-silanyloxymethyl)-5-cyano-biphenyl-3-yl]-2-oxo-ethyl}-4-oxo-azetidin-1-yl)-oxo-acetic acid allyl ester 在
三氟化硼乙醚 作用下,
以
乙腈 为溶剂,
反应 1.0h,
以93%的产率得到[(2R,3S)-2-[2-(5-Cyano-4'-hydroxymethyl-biphenyl-3-yl)-2-oxo-ethyl]-3-((R)-1-hydroxy-ethyl)-4-oxo-azetidin-1-yl]-oxo-acetic acid allyl ester