5'-amino-2'-O-(tert-butyldimethylsilyl)-3'-[[N-(2'-O-(tert-butyldimethylsilyl)-3',5'-dideoxy-3'-[(ethoxycarbonyl)methyl]uridin-5'-yl)carbamoyl]methyl]-3',5'-dideoxyuridine 、
5'-azido-2'-O-(tert-butyldimethylsilyl)-3'-[[N-(2'-O-(tert-butyldimethylsilyl)-3',5'-dideoxy-3'-(carboxymethyl)uridin-5'-yl)carbamoyl]methyl]-3',5'-dideoxyuridine 在
N,N'-二环己基碳二亚胺 作用下,
以
1,4-二氧六环 为溶剂,
反应 48.0h,
以61%的产率得到ethyl 2-[(2S,3R,4R,5R)-2-[[[2-[(2S,3R,4R,5R)-2-[[[2-[(2S,3R,4R,5R)-2-[[[2-[(2S,3R,4R,5R)-2-(azidomethyl)-4-[tert-butyl(dimethyl)silyl]oxy-5-(2,4-dioxopyrimidin-1-yl)oxolan-3-yl]acetyl]amino]methyl]-4-[tert-butyl(dimethyl)silyl]oxy-5-(2,4-dioxopyrimidin-1-yl)oxolan-3-yl]acetyl]amino]methyl]-4-[tert-butyl(dimethyl)silyl]oxy-5-(2,4-dioxopyrimidin-1-yl)oxolan-3-yl]acetyl]amino]methyl]-4-[tert-butyl(dimethyl)silyl]oxy-5-(2,4-dioxopyrimidin-1-yl)oxolan-3-yl]acetate