(S)-4-{2-[(S)-4-(2-Amino-phenyl)-2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-ylmethoxy)-butyrylamino]-phenyl}-2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-ylmethoxy)-butyric acid methyl ester 、
(S)-4-{2-[(S)-4-(2-tert-Butoxycarbonylamino-phenyl)-2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-ylmethoxy)-butyrylamino]-phenyl}-2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-ylmethoxy)-butyric acid 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 24.0h,
以70%的产率得到methyl (2S)-2-[(5-methyl-2,4-dioxopyrimidin-1-yl)methoxy]-4-[2-[[(2S)-2-[(5-methyl-2,4-dioxopyrimidin-1-yl)methoxy]-4-[2-[[(2S)-2-[(5-methyl-2,4-dioxopyrimidin-1-yl)methoxy]-4-[2-[[(2S)-2-[(5-methyl-2,4-dioxopyrimidin-1-yl)methoxy]-4-[2-[(2-methylpropan-2-yl)oxycarbonylamino]phenyl]butanoyl]amino]phenyl]butanoyl]amino]phenyl]butanoyl]amino]phenyl]butanoate