[2-O-benzoyl-5-O-dimethoxytrityl-1-(4-N-benzoylcytosin-1-yl)-β-D-ribofuranos-3-O-yl] succinate 、
4-methoxy-1-oxido-2-pyridylmethyl-[2-O-benzoyl-1-(uracil-1-yl)-5-O-dimethoxytrityl-β-D-ribofuranos-3-O-yl]methylphosphonate 、
N,N-diisopropyl methyl [2-O-benzoyloxymethoxymethyl-5-O-dimethoxytrityl-1-(2-N-isobutyrylguanin-9-yl)-β-D-ribofuranos-3-O-yl]phosphoramidite 、
4-methoxy-1-oxido-2-pyridylmethyl-[2-O-benzoyl-1-(6-N-benzoyladenin-9-yl)-5-O-dimethoxytrityl-β-D-ribofuranos-3-O-yl]methylphosphonate 、
4-methoxy-1-oxido-2-pyridylmethyl-[2-O-benzoyl-1-(2-N-isobutyrylguanin-9-yl)-5-O-dimethoxytrityl-β-D-ribofuranos-3-O-yl]methylphosphonate 在
O-<[cyano(ethoxycarbonyl)methylene]amino>-1,1,3,3-tetramethyluronium tetrafluoroborate 、
[3-O-benzoyl-5-O-dimethoxytrityl-1-(4-N-benzoylcytosin-1-yl)-β-D-ribofuranos-2-O-yl] succinate 、
N,N-二异丙基乙胺 、
2,6-二甲基吡啶 、
4-二甲氨基吡啶 、
乙酸酐 作用下,
以
N,N-二甲基甲酰胺 、
四氢呋喃 为溶剂,
反应 2.52h,
以58%的产率得到[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-2-[[[(2R,3S,4R,5R)-2-[[[(2R,3S,4R,5R)-2-[[[(2R,3S,4R,5R)-2-[[[(2R,3S,4R,5R)-2-[[[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-2-[[[(2R,3S,4R,5R)-2-[[[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-4-hydroxy-2-(hydroxymethyl)oxolan-3-yl]oxymethyl-hydroxyphosphoryl]oxymethyl]-5-(2,4-dioxopyrimidin-1-yl)-4-hydroxyoxolan-3-yl]oxymethyl-hydroxyphosphoryl]oxymethyl]-4-hydroxyoxolan-3-yl]oxymethyl-hydroxyphosphoryl]oxymethyl]-5-(6-aminopurin-9-yl)-4-hydroxyoxolan-3-yl]oxymethyl-hydroxyphosphoryl]oxymethyl]-5-(2,4-dioxopyrimidin-1-yl)-4-hydroxyoxolan-3-yl]oxymethyl-hydroxyphosphoryl]oxymethyl]-5-(6-aminopurin-9-yl)-4-hydroxyoxolan-3-yl]oxymethyl-hydroxyphosphoryl]oxymethyl]-5-(2,4-dioxopyrimidin-1-yl)-4-hydroxyoxolan-3-yl]oxymethyl-hydroxyphosphoryl]oxymethyl]-4-hydroxyoxolan-3-yl]oxymethyl-[[(2R,3S,4R,5R)-5-(4-amino-2-oxopyrimidin-1-yl)-3,4-dihydroxyoxolan-2-yl]methoxy]phosphinic acid