3-{5-O-[bis-(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl}-3,6-dihydro-7H-1,2,3-triazolo[4,5-d]pyrimidin-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
四氢呋喃 为溶剂,
反应 1.17h,
以28%的产率得到3-{5-O-[bis-(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl}-3,6-dihydro-7H-1,2,3-triazolo[4,5-d]pyrimidin-7-one 3'-(2-cyanoethyl-diisopropylphosphoramidite)