Synthesis of halogenated benzimidazolyl-<i>C</i>-nucleosides and their activity against <i>Leishmania major</i> and <i>Leishmania tropica</i>
作者:Umair Ahmed Khan、M. Iqbal Choudhary、Sammer Yousuf
DOI:10.1039/d4nj00035h
日期:2024.3.25
good yields. Subsequently, the acetylated β-D-galactopyranosyl C-6 aldehydes were reacted with halogen-substituted O-phenylenediamine to furnish reverse C-galactopyranosyl nucleosides 3a to 7a; 3b to 7b. Hitherto, this is the first report on the synthesis of pyranose-based reverse-position C-nucleosides. These newly synthesized C-nucleosides were identified as an anti-leishmanial agent, in vitro, against
在这里,我们报告了“反向”卤化 C-核苷(苯并咪唑)类似物的简短合成。最初,1,2;D-半乳糖的3,4邻位二醇用两种不同的酮丙酮和环己酮乙酰化,分别提供乙酰化半乳吡喃糖1a和1b。随后,使用氯铬酸吡啶鎓(PCC)将1a和1b的C-6羟基氧化成醛2a和2b,收率良好。随后,乙酰化的β- D-吡喃半乳糖基C-6醛与卤素取代的O-苯二胺反应,得到反C-吡喃半乳糖基核苷3a至7a;3b至7b。迄今为止,这是第一篇关于基于吡喃糖的反位C-核苷的合成的报道。这些新合成的 C-核苷在体外被鉴定为抗利什曼原虫药物,可对抗大型利什曼原虫和热带利什曼原虫。发现苯并咪唑部分上的卤素取代和C-核苷乙酰化基团的亲脂性是抗利什曼原虫活性的关键因素。例如,化合物3a(一种非卤代类似物)无活性,而其溴取代类似物6a对L. Major和L. tropica有相当大的活性,IC 50分别为 8.60 ± 0.04 μM 和