π-Interactions of Modified Nucleobases. On Mesomeric Purine Betaines with Inversed Charge Properties.
作者:Andreas Schmidt、Markus Karl Kindermann
DOI:10.1246/bcsj.74.2379
日期:2001.12
calculations, 1H NMR titrations and ESI mass spectrometry. Thus, nucleophilic substitutions of 4-(dimethylamino)pyridine and pyridine, respectively, on 2-amino-6-chloropurine 1 and 2,6-dichloropurine 2 resulted in the formation of purin-6-yl hetarenium salts 3–6. These were converted into the conjugated mesomeric betaines 7–10, respectively, on treatment with the anion exchange resin Amberlite® IRA-400
研究了与自然系统相关的具有改变的电荷特性的修饰核碱基的分子间相互作用。我们制备了嘌呤的共轭甜菜碱,并通过半经验计算、1H NMR 滴定和 ESI 质谱检查了它们的性质。因此,4-(二甲氨基)吡啶和吡啶分别在 2-氨基-6-氯嘌呤 1 和 2,6-二氯嘌呤 2 上的亲核取代导致形成了 purin-6-yl hetarenium 盐 3-6。在用羟基形式的阴离子交换树脂 Amberlite® IRA-400 处理后,它们分别转化为共轭内消旋甜菜碱 7-10。甜菜碱 7-10 具有与 7-甲基鸟嘌呤相关的折叠嘌呤环,形成 m-RNA 的甜菜碱 5'-帽结构。