3-methyl-4-methoxy-5-ethylbenzofuran-2-carboxylic acid 、
(S)-2-(4'-aminobiphenyl-4-sulfonylamino)-3-methylbutyric acid methyl ester 在
benzotriazol-1-yloxyl-tris-(pyrrolidino)-phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
以73.9%的产率得到methyl N-[(4'-{[(5-ethyl-4-methoxy-3-methyl-1-benzofuran-2-yl)carbonyl]amino}-1,1'-biphenyl-4-yl)sulfonyl]-L-valinate