(S)-2-(3,5-Dimethyl-pyrazol-1-ylmethoxycarbonylamino)-4-methylsulfanyl-butyric acid 、 (2R,4S,5S)-5-Amino-4-hydroxy-2,7-dimethyl-octanoic acid ((S)-1-benzylcarbamoyl-2-methyl-propyl)-amide; compound with trifluoro-acetic acid 在
1-羟基苯并三唑 、
1-(3-二甲基氨基丙基)-3-乙基碳二亚胺 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以16 mg的产率得到{(S)-1-[(1S,2S,4R)-4-((S)-1-Benzylcarbamoyl-2-methyl-propylcarbamoyl)-2-hydroxy-1-isobutyl-pentylcarbamoyl]-3-methylsulfanyl-propyl}-carbamic acid 3,5-dimethyl-pyrazol-1-ylmethyl ester