Synthesis and Properties of New Nucleotide Analogues Possessing Squaramide Moieties as New Phosphate Isosters
作者:Kohji Seio、Takuhei Miyashita、Kousuke Sato、Mitsuo Sekine
DOI:10.1002/ejoc.200500520
日期:2005.12
condensation of 5′- or 3′-aminonucleosides with dimethyl squarate, whilst the selective removal of the methyl group was effectively accomplished by treatment with sodium bromide. In addition, we also synthesized 3′,5′-cyclic nucleotide analogues from the 3′,5′-diazidonucleoside derivatives. NMR analysis revealed that their ribose puckering was of an N-type form, identical to that in cAMP and cGMP. Because
合成了结合独特方酸酰胺结构的 2'-脱氧核苷酸和核糖核苷酸的新类似物。由于该部分的强酸性(pKa = 2.3),这些核苷酸类似物以单阴离子形式存在,在生理条件下可以被视为5'-核苷酸的电子等排体。核苷酸类似物的合成是通过 5'-或 3'-氨基核苷与方酸二甲酯的缩合来实现的,而甲基的选择性去除则是通过用溴化钠处理来有效实现的。此外,我们还从 3',5'-二叠氮核苷衍生物合成了 3',5'-环核苷酸类似物。核磁共振分析表明,它们的核糖起皱是一种 N 型形式,与 cAMP 和 cGMP 中的相同。由于独特的结构、电子、和方酸酰胺型核苷酸类似物的构象特性,这些类似物作为潜在的生物活性化合物,如抗病毒和抗癌剂,应该是非常有趣的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)