6-[(2-methylpropanoyl)amino]-1-(2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-erythro-pentofuranosyl)-1,5-dihydro-3-{[di(prop-2-ynl)amino]prop-1-ynyl}-4H-pyrazolo[3,4-d]pyrimidin-4-one   、                                                                                      
2-氰乙基N,N-二异丙基氯亚磷酰胺                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                以83%的产率得到6-[(2-methylpropanoyl)amino]-1-[2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-erythro-pentofuranosyl]-1,5-dihydro-3-{[di(prop-2-ynl)amino]prop-1-ynyl}-4H-pyrazolo[3,4-d]pyrimidin-4-one 3'-[(2-cyanoethyl)-N,N-(diisopropyl)]phosphoramidite