5'-O-(4,4'-dimethoxytrityl)-2'-O-[(1-N-methyltetrazol-5-yl)ethyl]-6-N-phenoxyacetyladenosine 、
双(二异丙基氨基)(2-氰基乙氧基)膦 在
二异丙基铵盐四氮唑 作用下,
以
二氯甲烷 为溶剂,
以55%的产率得到5'-O-(4,4'-dimethoxytrityl)-2'-O-[(1-N-methyltetrazol-5-yl)ethyl]-6-N-phenoxyacetyladenosine 3'-(2-cyanoethyl N,N-diisopropylphosphoramidite