(2R,4R)-2-(5-Hydroxymethyl-1-methyl-1H-pyrazol-3-ylmethyl)-4-methanesulfonyloxy-pyrrolidine-1-carboxylic acid allyl ester 在
N,N-二甲基乙酰胺 、
N,N-二异丙基乙胺 作用下,
以
乙腈 为溶剂,
生成 3-{(2R,4S)-1-Allyloxycarbonyl-4-[(4R,5S,6S)-2-allyloxycarbonyl-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-en-3-ylsulfanyl]-pyrrolidin-2-ylmethyl}-5-hydroxymethyl-1,2-dimethyl-2H-pyrazol-1-ium; chloride