1,5-anhydro-2-deoxy-2-[N2-(dimethylaminomethylene)guanin-9-yl]-3-O-(9-fluorenylmethoxycarbonyl)-6-O-monomethoxytrityl-D-altro-hexitol 、
2-氰乙基N,N-二异丙基氯亚磷酰胺 在
N-甲基咪唑 、
2,4,6-三甲基吡啶 作用下,
以
四氢呋喃 为溶剂,
以71%的产率得到1,5-anhydro-2-deoxy-2-[N2-(dimethylaminomethylene)guanin-9-yl]-3-O-(9-fluorenylmethoxycarbonyl)-6-O-monomethoxytrityl-D-altro-hexitol 4-[(2-cyanoethyl)-N,N-diisopropylphosphoramidite]