(6R)-4-diazo-3-methyl-5t,8-dioxo-7t-(2-phenoxy-acetylamino)-(6rH)-5λ4-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2,2,2-trichloro-ethyl ester 在
三溴化磷 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成
(6R)-4c-bromo-3-methyl-8-oxo-7t-(2-phenoxy-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 2,2,2-trichloro-ethyl ester