2-氰乙基N,N-二异丙基氯亚磷酰胺 、
1-[2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-ribofuranosyl]-N6-(4-methoxybenzoyl)imidazo[5',4':4,5]pyrido[2,3-d]pyrimidine-4,7(5H)-dione 在
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
以57%的产率得到1-[2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-ribofuranosyl]-N
6-(4-methoxybenzoyl)imidazo[5',4':4,5]pyrido[2,3-d]pyrimidine-4,7(5H)-dione 2-cyanoethyl N,N'-diisopropylphosphoramidite