5'-azido-2'-O-(tert-butyldimethylsilyl)-3',5'-dideoxy-3'-{[(4-nitrophenoxy)carbonyl]methyl}uridine   、                                                                                      
                                                                                                                                                                                              以
                                                                                         
二乙二醇二甲醚                                                                                  为溶剂,
                                                                                                                                                    反应 24.0h,
                                                                                                                以92%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