双(二异丙基氨基)(2-氰基乙氧基)膦   、                                                                                      
6-(N,N-diphenylcarbamoyl)oxy-1-[2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-erythro-pentofuranosyl]-1H-pyrazolo[3,4-d]pyrimidine                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                以68%的产率得到6-(N,N-diphenylcarbamoyl)oxy-1-[2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-erythro-pentofuranosyl]-1H-pyrazolo[3,4-d]pyrimidine 3'-[(2-cyanoethyl)-N,N-diisopropylphosphoramidite]