、
{(2-tert-Butoxycarbonylamino-ethyl)-[2-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetyl]-amino}-acetic acid 在
(benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 1.0h,
以75%的产率得到methyl 2-[[2-(2-amino-6-oxo-1H-purin-9-yl)acetyl]-[2-[[2-[2-[[2-[2-[[2-[2-[[2-[2-[[2-[[2-(2,4-dioxopyrimidin-1-yl)acetyl]-[2-[(2-methylpropan-2-yl)oxycarbonylamino]ethyl]amino]acetyl]amino]ethyl-[2-[2-oxo-4-(phenylmethoxycarbonylamino)pyrimidin-1-yl]acetyl]amino]acetyl]amino]ethyl-[2-[2-oxo-4-(phenylmethoxycarbonylamino)pyrimidin-1-yl]acetyl]amino]acetyl]amino]ethyl-[2-[2-oxo-4-(phenylmethoxycarbonylamino)pyrimidin-1-yl]acetyl]amino]acetyl]amino]ethyl-[2-[6-(phenylmethoxycarbonylamino)purin-9-yl]acetyl]amino]acetyl]amino]ethyl]amino]acetate