1-(3-O-tert-butyldimethylsilyl-β-D-ribofuranosyl)-5,6-dichlorobenzimidazole 2'-<2,5-dichlorophenyl 2-(4-nitrophenyl)ethyl phosphate> 、
1-(3-O-tert-butyldimethylsilyl-5-O-p-methoxytrityl-β-D-ribofuranosyl)-5,6-dichlorobenzimidazole 2'-<2-(4-nitrophenyl)ethyl triethylammonium phosphate> 在
N-甲基咪唑 、
2,4,6-三异丙基苯磺酰氯 作用下,
以
吡啶 为溶剂,
反应 24.0h,
以47%的产率得到[(2R,3R,4R,5R)-4-[tert-butyl(dimethyl)silyl]oxy-5-[[[(2R,3R,4R,5R)-4-[tert-butyl(dimethyl)silyl]oxy-2-(5,6-dichlorobenzimidazol-1-yl)-5-[[(4-methoxyphenyl)-diphenylmethoxy]methyl]oxolan-3-yl]oxy-[2-(4-nitrophenyl)ethoxy]phosphoryl]oxymethyl]-2-(5,6-dichlorobenzimidazol-1-yl)oxolan-3-yl] (2,5-dichlorophenyl) 2-(4-nitrophenyl)ethyl phosphate