(R)-6-tert-Butoxycarbonylamino-2-[2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetylamino]-hexanoic acid 、
benzyl (2R)-6-[[(2R)-6-[[(2R)-6-amino-2-[[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]hexanoyl]amino]-2-[[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]hexanoyl]amino]-2-[[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]hexanoate 在
1-羟基苯并三唑 、
N,N-二异丙基乙胺 、
N,N'-二环己基碳二亚胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成 benzyl (2R)-2-[[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]-6-[[(2R)-2-[[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]-6-[[(2R)-2-[[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]-6-[[(2R)-2-[[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]-6-[(2-methylpropan-2-yl)oxycarbonylamino]hexanoyl]amino]hexanoyl]amino]hexanoyl]amino]hexanoate