3-methyl-4-prop-1-ynyl-benzofuran-2-carboxylic acid 、
(S)-2-(4'-aminobiphenyl-4-sulfonylamino)-3-methylbutyric acid methyl ester 在
(benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 18.0h,
以45%的产率得到L-3-methyl-2-{4'-[(3-methyl-4-prop-1-ynylbenzofuran-2-carbonyl)amino]biphenyl-4-sulfonylamino}butyric acid methyl ester