[(2R,3S)-2-Acetylsulfanyl-3-methoxy-4-oxo-3-(2-phenoxy-acetylamino)-azetidin-1-yl]-(triphenyl-λ5-phosphanylidene)-acetic acid 2-oxo-propyl ester 以
甲苯 为溶剂,
以57%的产率得到(5R,6S)-6-Methoxy-3-methyl-7-oxo-6-(2-phenoxy-acetylamino)-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 2-oxo-propyl ester