、
(3S,4S)-3-hydroxy-4-[[3-(methanesulfonamido)-5-[[(1R)-1-phenylethyl]carbamoyl]benzoyl]amino]-5-phenylpentanoic acid 在
N-羟基-7-氮杂苯并三氮唑 、
N,N-二异丙基乙胺 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
二氯甲烷 为溶剂,
以61.9 mg的产率得到methyl (2S)-1-[(2R)-2-[[(2S)-2-[[(2S)-2-[[(3S,4S)-3-hydroxy-4-[[3-(methanesulfonamido)-5-[[(1R)-1-phenylethyl]carbamoyl]benzoyl]amino]-5-phenylpentanoyl]amino]-4-methylpentanoyl]amino]propanoyl]-methylamino]-3-phenylpropanoyl]pyrrolidine-2-carboxylate