(2S)-1-[(2S)-3-[2-[4-[(2S)-2-[[(2S)-2-amino-5-[[amino-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonylamino]methylidene]amino]pentanoyl]amino]-3-[(2-methylpropan-2-yl)oxy]-3-oxopropyl]imidazol-1-yl]-1H-indol-3-yl]-2-(1,3-dioxoisoindol-2-yl)propanoyl]pyrrolidine-2-carboxylic acid 在
1-羟基苯并三唑 、 O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 9.5h,
以96%的产率得到tert-butyl (12S,18S,21S,24S)-21-[3-[[amino-[(2,2,4,6,7-pentamethyl-3H-1-benzofuran-5-yl)sulfonylamino]methylidene]amino]propyl]-12-(1,3-dioxoisoindol-2-yl)-13,19,22-trioxo-1,3,14,20,23,27-hexazapentacyclo[24.2.1.02,10.04,9.014,18]nonacosa-2(10),4,6,8,26(29),27-hexaene-24-carboxylate