N-(6,9-dihydro-9-(15-(tert-butoxycarbonyl)-3-(2-(2-(morpholin-4-yl)ethylamino)-2-oxoethyl)-2,7,13,19-tetraoxo-21-phenyl-20-oxa-3,6,9,12,15,18-hexaazaheneicos-1-yl)-6-oxo-1H-purin-2-yl)carbamic acid phenylmethyl ester 、
[6-N-(benzyloxycarbonyl)-adenin-9-yl]-acetic acid 在
bromo-tris-dimethylamino-phosphonium hexafluorophosphate 、
三乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以67%的产率得到N-(6,9-dihydro-9-(15-(tert-butoxycarbonyl)-3-(2-(2-(morpholin-4-yl)ethylamino)-2-oxoethyl)-2,7,13,19-tetraoxo-21-phenyl-9-(2-((6-phenylmethoxycarbonylamino)-9H-purin-9-yl)acetyl)-20-oxa-3,6,9,12,15,18-hexaazaheneicos-1-yl)-6-oxo-1H-purin-2-yl)carbamic acid phenylmethyl ester