Electrophile-promoted addition of hydroxymethylphosphonate to 4′,5′-didehydronucleosides: a way to novel isosteric analogues of 5′-nucleotides
作者:Zdeněk Točík、Ivana Dvořáková、Radek Liboska、Miloš Buděšínský、Milena Masojídková、Ivan Rosenberg
DOI:10.1016/j.tet.2007.03.059
日期:2007.5
addition of dialkyl-hydroxymethylphosphonate to the protected 4′,5′-didehydronucleosides resulted in an epimeric mixture of 4′-dialkylphosphonomethoxy derivatives of 2′,5′-dideoxynucleosides, novel analogues of 2′-deoxynucleoside 5′-monophosphates. Several types of electrophiles (pyridinium tosylate, NIS, NBS, MCPBA and others) were evaluated in addition reactions with 4′,5′-didehydrothymidine. Out
亲电子促进的将二烷基羟甲基膦酸酯加到受保护的4',5'-didehydronucleosides上,生成2',5'-dideoxynucleosides的4'-di烷基膦酰基甲氧基衍生物的差向异构体混合物,这是2'-deoxynucleoside 5'-monophosphates的新类似物。在与4',5'-二氢胸苷的加成反应中评估了几种类型的亲电试剂(甲苯磺酸吡啶鎓,NIS,NBS,MCPBA等)。从中发现,甲苯磺酸吡啶鎓在这些转化中具有实际用途。它的使用导致了一系列常见2'-脱氧核苷的4'-膦酰基甲氧基衍生物的制备。在生物学筛选中,这些游离膦酸没有发挥明显的细胞抑制或抗病毒活性。