5'-O-(4,4'-dimethoxytrityl)-5-methyl-2'-O,4'-C-(N-methylaminomethylene)uridine 、
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
乙腈 为溶剂,
以88%的产率得到3'-O-[2-cyanoethoxy(diisopropylamino)phosphino]-5'-O-(4,4'-dimethoxytrityl)-5-methyl-2'-O,4'-C-(N-methylaminomethylene)uridine