CBZ-L-缬氨酸 、 (S)-2-{(R)-2-[(2R,3S)-3-((S)-2-Amino-3-methyl-butyrylamino)-2-hydroxy-pentanoylamino]-4-methyl-pentanoylamino}-3-methyl-butyric acid benzyl ester; compound with trifluoro-acetic acid 在
1-羟基苯并三唑 、
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以312.6 mg的产率得到(S)-2-((R)-2-{(2R,3S)-3-[(S)-2-((S)-2-Benzyloxycarbonylamino-3-methyl-butyrylamino)-3-methyl-butyrylamino]-2-hydroxy-pentanoylamino}-4-methyl-pentanoylamino)-3-methyl-butyric acid benzyl ester