5'-O-(4,4'-dimethoxytrityl)thymidylyl-(3'-5'-carbamoyl)-5'-amino-2'-O,5'-N-cyclo-5'-deoxyarabinouridine 、
双(二异丙基氨基)(2-氰基乙氧基)膦 在
二异丙基铵盐四氮唑 作用下,
以
四氢呋喃 、
乙腈 为溶剂,
以78%的产率得到5'-O-(4,4'-dimethoxytrityl)thymidylyl-(3'-5'-carbamoyl)-5'-amino-2'-O,5'-N-cyclo-5'-deoxy-3'-O-(N,N-diisopropylamino-β-cyanoethoxyphosphino)arabinouridine