丁二酸酐 、
2-(4-nitrophenyl)ethyl 5-{{{{2-{2-{2-{{9-[2'-deoxy-5'-O-(4,4'-dimethoxytrityl)-β-D-ribofuranosyl]-1-{2-[(2,4-dinitrophenyl)methylamino]ethyl}-6,9-dihydro-6-oxo-1H-purin-2-yl}amino}ethoxy}ethoxy}ethyl}amino}carbonyl}amino}-2-{6-[2-(4-nitrophenyl)ethoxy]-3-oxo-3H-xanthen-9-yl}benzoate 在
4-二甲氨基吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 24.0h,
以98%的产率得到2-(4-nitrophenyl)ethyl 5-{{{{2-{2-{2-{{9-[3'-O-(3-carboxy-1-oxopropyl)-2'-deoxy-5'-O-(4,4'-dimethoxytrityl)-β-D-ribofuranosyl]-1-{2-[(2,4-dinitrophenyl)methylamino]ethyl}-6,9-dihydro-6-oxo-1H-purin-2-yl}amino}ethoxy}ethoxy}ethyl}amino}carbonyl}amino}-2-{6-[2-(4-nitrophenyl)ethoxy]-3-oxo-3H-xanthen-9-yl}benzoate