(1S,3R,4S,7R)-1-(4,4'-dimethoxytrityloxymethyl)-7-hydroxy-3-[5-{3-(1-pyrenecarboxamido)propynyl}uracil-1-yl]-2,5-dioxabicyclo[2.2.1]heptane 、
2-氰乙基N,N-二异丙基氯亚磷酰胺 在
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以75%的产率得到(1S,3R,4S,7R)-7-[2-cyanoethoxy(diisopropylamino)phosphinoxy]-1-(4,4'-dimethoxytrityloxymethyl)-3-[5-{3-(1-pyrenecarboxamido)propynyl}uracil-1-yl]-2,5-dioxabicyclo[2.2.1]heptane