氯磷酸二苯酯 、
(2R,4S,5S,6S)-4-Fluoro-6-((R)-1-hydroxy-ethyl)-4-methyl-3,7-dioxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-nitro-benzyl ester 在
N,N-二异丙基乙胺 作用下,
以
乙腈 为溶剂,
生成 (4S,5S,6S)-3-(Diphenoxy-phosphoryloxy)-4-fluoro-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester