ethyl (1-({3-[2-(tert-butoxy)-2-oxoethyl]-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl}methyl)-2-{[6-{[1-(2-ethoxy-2-oxoethyl)hydrazinyl]methyl}-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl]acetyl}hydrazinyl)acetate 、
(6-{[(benzyloxy)carbonyl]amino}-8-{[2-{[6-{[(benzyloxy)carbonyl]amino}-8-({1-(2-ethoxy-2-oxoethyl)-2-[(9H-fluoren-9-ylmethoxy)carbonyl]hydrazinyl}methyl)-9H-purin-9-yl]acetyl}-1-(2-ethoxy-2-oxoethyl)hydrazinyl]methyl}-9H-purin-9-yl)acetic acid 在
O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium 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72%的产率得到(9H-fluoren-9-yl)methyl 2-[(6-{[(benzyloxy)carbonyl]amino}-9-{2-[2-{[6-{[(benzyloxy)carbonyl]amino}-9-(2-{2-[(3-{2-[2-{[3-(2-tert-butoxy-2-oxoethyl)-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl]methyl}-2-(2-ethoxy-2-oxoethyl)hydrazinyl]-2-oxoethyl}-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)methyl]-2-(2-ethoxy-2-oxoethyl)hydrazinyl}-2-oxoethyl)-9H-purin-8-yl]methyl}-2-(2-ethoxy-2-oxoethyl)hydrazinyl]-2-oxoethyl}-9H-purin-8-yl)methyl]-2-(2-ethoxy-2-oxoethyl)hydrazinecarboxylate