{(2-Amino-ethyl)-[2-(6-benzyloxycarbonylamino-purin-9-yl)-acetyl]-amino}-acetic acid methyl ester; hydrochloride 、
[Allyloxycarbonyl-(2-{2-[tert-butoxycarbonyl-(2-{[(4-methoxy-phenyl)-diphenyl-methyl]-amino}-ethyl)-amino]-acetylamino}-ethyl)-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,
以80%的产率得到{(2-{2-[Allyloxycarbonyl-(2-{2-[tert-butoxycarbonyl-(2-{[(4-methoxy-phenyl)-diphenyl-methyl]-amino}-ethyl)-amino]-acetylamino}-ethyl)-amino]-acetylamino}-ethyl)-[2-(6-benzyloxycarbonylamino-purin-9-yl)-acetyl]-amino}-acetic acid methyl ester