(1S,3R,9R,10R,12R)-3-(3(S)-hydroxy-5(R)-(thymin-1-yl)tetrahydrofuran-2(R)-yl)methoxy-3-oxo-12-(4,4'-dimethoxytrityl)oxymethyl-10-(thymin-1-yl)-2,4,11-trioxa-3-phosphabicyclo[7.3.0]dodecan   、                                                                                      
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
                                                                                         
二氯甲烷   、                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                以81%的产率得到3-[[(2R,3S,5R)-2-[[(2S,7aR,8R,10R,10aS)-10-[[bis(4-methoxyphenyl)-phenylmethoxy]methyl]-8-(2,4-dioxopyrimidin-1-yl)-2-oxo-4,5,6,7,7a,8,10,10a-octahydrofuro[3,4-d][1,3,2]dioxaphosphonin-2-yl]oxymethyl]-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-3-yl]oxy-[di(propan-2-yl)amino]phosphanyl]oxypropanenitrile