4-溴苯磺酰氯 、 (1R,2S)-1-{[(2S,4S)-1-((S)-2-tert-Butoxycarbonylamino-3,3-dimethyl-butyryl)-4-hydroxy-pyrrolidine-2-carbonyl]-amino}-2-vinyl-cyclopropanecarboxylic acid methyl ester 在
4-二甲氨基吡啶 三乙胺 作用下,
以
二氯甲烷 为溶剂,
以64%的产率得到methyl (1R,2S)-1-[[(2S,4S)-4-(4-bromophenyl)sulfonyloxy-1-[(2S)-3,3-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]butanoyl]pyrrolidine-2-carbonyl]amino]-2-ethenylcyclopropane-1-carboxylate