1-(3-O-tert-butyldimethylsilyl-β-D-ribofuranosyl)-5,6-dichlorobenzimidazolyl-(2'-P-<2-(4-nitrophenyl)ethyl>>->5')-5,6-dichloro 1-(2,3-di-O-tert-butyldimethylsilyl-β-D-ribofuranosyl)benzimidazole 、
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 25.0h,
以43%的产率得到[(2R,3R,4R,5R)-4-[[(2R,3R,4R,5R)-3,4-bis[[tert-butyl(dimethyl)silyl]oxy]-5-(5,6-dichlorobenzimidazol-1-yl)oxolan-2-yl]methoxy-[2-(4-nitrophenyl)ethoxy]phosphoryl]oxy-3-[tert-butyl(dimethyl)silyl]oxy-5-(5,6-dichlorobenzimidazol-1-yl)oxolan-2-yl]methyl [(2R,3R,4R,5R)-4-[tert-butyl(dimethyl)silyl]oxy-2-(5,6-dichlorobenzimidazol-1-yl)-5-[[(4-methoxyphenyl)-diphenylmethoxy]methyl]oxolan-3-yl] 2-(4-nitrophenyl)ethyl phosphate