pivaloyloxymethyl (1R,5S,6S)-2-[(3S,5S)-5-N,N-dimethylaminocarbonylpyrrolidin-2-ylthio]-6-[(1R)-1-hydroxyethyl]-1-methylcarbapen-2-em-3-carboxylate 、
4-bromomethyl-methyl-5-methyl-2-oxo-1,3-dioxolene 在
三乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 1.5h,
以230 mg的产率得到pivaloyloxymethyl (1R,5S,6S)-2-{(3S,5S)-[5-N,N-dimethylaminocarbonyl-1-(5-methyl-2-oxo-1,3-dioxolen-4-yl)methyl]pyrrolidin-3-ylthio}-6-[(1R)-1-hydroxyethyl]-1-methylcarbapen-2-em-3-carboxylate