3-[2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-erythro-pentofuranosyl]-7-(N,N-dibutylaminomethylidene)-5-[(diphenylcarbamoyl)oxy]-3H-1,2,3-triazolo[4,5-d]pyrimidine 、
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 0.25h,
以78%的产率得到3-[2-deoxy-5-O-(4,4'-dimethoxytriphenylmethyl)-β-D-erythro-pentofuranosyl]-7-(N,N-dibutylaminomethylidene)-5-[(diphenylcarbamoyl)oxy]-3H-1,2,3-triazolo[4,5-d]pyrimidine 3'-(2-cyanoethyl-N,N-diisopropyl)phosphoramidite