(1S,3R,4S,7R)-1-(4,4'-dimethoxytrityloxymethyl)-3-(2-N-((dimethylamino)methylidene)-7-hydroxy-guanin-9-yl)-2,5-dioxabicyclo[2.2.1]heptane 、
双(二异丙基氨基)(2-氰基乙氧基)膦 在
4,5-二氰基咪唑 作用下,
以
DMF (N,N-dimethyl-formamide) 、
乙腈 为溶剂,
反应 4.0h,
以49%的产率得到(1S,3R,4S,7R)-1-(4,4'-dimethoxytrityloxymethyl)-7-(2-cyanoethoxy(diisopropylamino)phosphinoxy)-3-[2-N-((N',N'-dimethylamino)methylidene)-guanin-9-yl]-2,5-dioxabicyclo[2.2.1]heptane