6-{[1-(dimethylamino)ethylidene]amino}-9-[(5-O-(4,4'-dimethoxytrityl)-2-O-(propargyl)-β-D-ribofuranosyl)]purin-2-yl-diphenylcarbamate   、                                                                                      
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 2.0h,
                                                                                                                以84%的产率得到6-{[1-(dimethylamino)ethylidene]amino}-9-[(5-O-(4,4'-dimethoxytrityl)-2-O-(propargyl)-β-D-ribofuranosyl)]purin-2-yl-diphenylcarbamate 3-O-(2-cyanoethyl)-N,N-diisopropylphosphoramidite