(2R,5R,6R)-6-(1-Fluoro-1-methyl-ethyl)-3,7-dioxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-nitro-benzyl ester 、
乙氧甲酰基亚甲基三苯基膦 以
二氯甲烷 为溶剂,
反应 2.0h,
生成
(5R,6R)-3-Ethoxycarbonylmethyl-6-(1-fluoro-1-methyl-ethyl)-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester 、 (2R,5R,6R)-3-[1-Ethoxycarbonyl-meth-(E)-ylidene]-6-(1-fluoro-1-methyl-ethyl)-7-oxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-nitro-benzyl ester 、 (2R,5R,6R)-3-[1-Ethoxycarbonyl-meth-(E)-ylidene]-6-(1-fluoro-1-methyl-ethyl)-7-oxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-nitro-benzyl ester