Allyl (5R,6S)-2-[(3S,5S)-N-(allyloxycarbonyl)-5-(1-naphthylmethyl)pyrrolidin-3-ylthio]-6-[(1R)-1-hydroxyethyl]-1-carbapen-2-em-3-carboxylate (633 mg, yield: 70.1%) was prepared as a yellow powder, from (2R,4S)-4-acetylthio-N-allyloxycarbonyl-2-(1-naphthylmethyl)pyrrolidine (610 mg, 1.53 mmol), allyl (5R,6S)-2-diphenoxyphosphoryloxy-6-[(1R)-1-hydroxyethyl]-1-carbapen-2-em-3-carboxylate (743 mg, 1.53 mmol), 1N aqueous sodium hydroxide (1.8 ml, 1.8 mmol), 1N aqueous hydrochloric acid (1.8 ml, 1.8 mmol) and N,N-diisopropylethylamine (800 μl, 4.59 mmol), in the same manner as in Example 135-1.
