4-(4-tert-butylphenoxyacetylamino)-2-(2-deoxy-5-O-4,4'-dimethoxytrityl-β-D-erythro-pentofuranosyl)-2,6-dihydro-7H-2,3,5,6-tetraazabenzo[cd]azulen-7-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78%的产率得到4-(4-tert-butylphenoxyacetylamino)-2-{2-deoxy-3-O-[(N,N-diisopropylamino)-2-cyanoethoxyphosphino]-5-O-4,4'-dimethoxytrityl-β-D-erythro-pentofuranosyl}-2,6-dihydro-7H-2,3,5,6-tetraazabenzo[cd]azulen-7-one