作者:Mei-Ying Pan、Wen Hang、Xiao-Jun Zhao、Hang Zhao、Peng-Chi Deng、Zhi-Hua Xing、Yong Qing、Yang He
DOI:10.1039/c1ob05577a
日期:——
Novel Janus-type nucleoside analogues (1a–d) were synthesized. Their pyrimido[4,5-d]pyrimidine base moiety has one face with a bidentate Watson–Crick donor–acceptor (DA) H-bond array of adenine and the other face with an acceptor–donor (AD) H-bond array of thymine. These nucleosides may self-associate through the self-complementary base pair. Indeed, in the solid state, compound 6d displayed a honeycomb-like supramolecular structure with tetrameric membered cavities formed through the combination of reverse Watson–Crick base pairs and aromatic stacking, in which the solvent molecules were accommodated. The result of temperature-dependent CD studies showed that the free nucleosides can form higher order chiral structures in aqueous solution.
新型双面型核苷类似物(1a–d)被合成。它们的嘧啶并[4,5-d]嘧啶碱基部分一面具有双齿Watson-Crick供体-受体(DA)氢键排列的腺嘌呤,另一面具有受体-供体(AD)氢键排列的胸腺嘧啶。这些核苷可以通过自身互补的碱基对自我结合。实际上,在固态中,化合物6d显示出蜂窝状的超分子结构,通过反向Watson-Crick碱基对和芳香堆积形成四聚体空腔,其中容纳了溶剂分子。温度依赖的圆二色谱研究结果显示,自由核苷在水溶液中能形成更高阶的 chiral 结构。