(5S,6S,7S)-7-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-3-methyl-5,8-dioxo-5λ4-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester 在
三溴化磷 作用下,
以
二氯甲烷 为溶剂,
以52%的产率得到(6S,7S)-7-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-3-methyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester