2-(4-nitrophenyl)ethyl 5-{{{{2-{2-{2-{{{{9-[2'-deoxy-5'-O-(4,4'-dimethoxytrityl)-β-D-ribofuranosyl]-6-[2-(4-nitrophenyl)ethoxy]-9H-purin-2-yl}{2-[(2,4-dinitrophenyl)amino]ethyl}amino}carbonyl}amino}ethoxy}ethoxy}ethyl}amino}carbonyl}amino}-2-{6-[2-(4-nitrophenyl)ethoxy]-3-oxo-3H-xanthen-9-yl}benzoate 、
双(二异丙基氨基)(2-氰基乙氧基)膦 在
四氮唑 作用下,
以
二氯甲烷 、
乙腈 为溶剂,
反应 3.0h,
以72%的产率得到2-(4-nitrophenyl)ethyl 5-{{{{2-{2-{2-{{{{9-{3'-O-[(2-cyanoethoxy)(diisopropylamino)phosphino]-2'-deoxy-5'-O-(4,4'-dimethoxytrityl)-β-D-ribofuranosyl}-6-[2-(4-nitrophenyl)ethoxy]-9H-purin-2-yl}{2-[(2,4-dinitrophenyl)amino]ethyl}amino}carbonyl}amino}ethoxy}ethoxy}ethyl}amino}carbonyl}-amino}-2-{6-[2-(4-nitrophenyl)ethoxy]-3-oxo-3H-xanthen-9-yl}benzoate