methyl (2S,3R)-3-[(2-methylpropan-2-yl)oxy]-2-[[1-[(2S,3R)-3-[(2-methylpropan-2-yl)oxy]-2-[(5-oxo-2,6-dihydro-1H-pyridin-3-yl)amino]butanoyl]-5-oxo-2,6-dihydropyridin-3-yl]amino]butanoate 、
N-叔丁氧羰基-O-叔丁基-L-苏氨酸 在
N,N-二异丙基乙胺 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 18.0h,
以92%的产率得到methyl (2S,3R)-3-[(2-methylpropan-2-yl)oxy]-2-[[1-[(2S,3R)-3-[(2-methylpropan-2-yl)oxy]-2-[[1-[(2S,3R)-3-[(2-methylpropan-2-yl)oxy]-2-[(2-methylpropan-2-yl)oxycarbonylamino]butanoyl]-5-oxo-2,6-dihydropyridin-3-yl]amino]butanoyl]-5-oxo-2,6-dihydropyridin-3-yl]amino]butanoate