Studies on Steric and Electronic Control of 2‘−3‘ Phosphoryl Migration in 2‘-Phosphorylated Uridine Derivatives and Its Application to the Synthesis of 2‘-Phosphorylated Oligouridylates
作者:Mitsuo Sekine、Hiroyuki Tsuruoka、Shin Iimura、Hiroshi Kusuoku、Takeshi Wada、Kiyotaka Furusawa
DOI:10.1021/jo952073k
日期:1996.1.1
phosphitylation with bis(2-cyano-1,1-dimethylethoxy)(diethylamino)phosphine followed by sulfurization. Treatment of the 2'-thiophosphorylated product 15 with (HF)(x)().Py in THF gave exclusively the 3',5'-unprotected uridine derivative 16a. Compound 16a was converted to the phosphoramidite unit 22 via a two-step reaction. This building block was used for the solution phase synthesis of U(2'-p)pU (29)
对于通过使用新的亚磷酰胺结构单元合成2'-磷酸化的低聚吡啶二酸酯,已经研究了几种掩蔽的磷酰基作为2'-磷酸酯前体,当3'羟基保护基必须是3'羟基时,不应将其迁移到3'位置。去除亚磷酰胺残基,将其引入3'-位。结果,发现双(2-氰基-1,1-二甲基乙氧基)硫代磷酰基(BCMETP)是最合适的2'-磷酸盐前体。该硫代磷酰基可通过与双(2-氰基-1,1-二甲基乙氧基)(二乙氨基)膦进行磷酸化,然后硫化而引入3',5'-甲硅烷基化尿苷衍生物7的2'-羟基。用(HF)(x)()。Py在THF中处理2'-硫代磷酸化产物15,仅得到3',5' -未保护的尿苷衍生物16a。化合物16a通过两步反应被转化为亚磷酰胺单元22。该构件用于U(2'-p)pU(29)和U(2'-ps)pU(30)的溶液相合成。通过在N,O-双(三甲基甲硅烷基)乙酰胺(BSA)存在下用DBU处理,从完全保护的衍生物25中有效除去2-