6-[(2-methylpropanoyl)amino]-1-(2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-erythro-pentofuranosyl)-1,5-dihydro-3-{[di(prop-2-ynl)amino]prop-1-ynyl}-4H-pyrazolo[3,4-d]pyrimidin-4-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83%的产率得到6-[(2-methylpropanoyl)amino]-1-[2-deoxy-5-O-(4,4'-dimethoxytrityl)-β-D-erythro-pentofuranosyl]-1,5-dihydro-3-{[di(prop-2-ynl)amino]prop-1-ynyl}-4H-pyrazolo[3,4-d]pyrimidin-4-one 3'-[(2-cyanoethyl)-N,N-(diisopropyl)]phosphoramidite