Copper-Catalyzed Decarboxylative Three-Component Reactions for the Synthesis of Imidazo[1,2-a]pyridines
作者:Thiruvengadam Palani、Kyungho Park、Manian Rajesh Kumar、Hyun Ming Jung、Sunwoo Lee
DOI:10.1002/ejoc.201200679
日期:2012.9
Imidazo[1,2-a]pyridine derivatives were synthesized through multicomponent couplingreactions of 2-aminopyridines, aldehydes, and alkynecarboxylic acids in the presence of 10 mol-% CuI/Cu(OTf)2. Both aryl- and alkyl-substituted alkynecarboxylic acids, including propiolic acid, were good alkyne sources and afforded the desired imidazo[1,2-a]pyridines in good yields through the decarboxylative coupling
Fabrication and characterization of copper complex immobilized on magnetic nanoparticles: an efficient and ecofriendly nanomagnetic catalyst for synthesis of imidazo[1,2-a]pyridines and pyranopyrazoles
作者:Yunhong Li、Xuemei Lin、Yanwen Sun
DOI:10.1007/s11164-024-05264-y
日期:2024.6
next step, the catalytic activity of this nanocomposite [Fe3O4@Dop/Amide-BenzImid-CuBr2] was evaluated the nanocomposite in the multicomponent synthesis of imidazo[1,2-a]pyridine and pyranopyrazole derivatives. The results clearly showed that this magnetic nanocatalyst in water solvent under reflux conditions is a very efficient catalytic system for the synthesis of imidazo[1,2-a]pyridines and pyranopyrazoles
咪唑并吡啶和吡喃吡唑衍生物包括一类非常重要的杂环化合物,它们具有许多生物学特性,并已在许多药物和生物活性分子的结构中观察到。在本研究项目中,我们首先成功地将铜催化剂固定在多巴胺和1 H-苯并[d]咪唑-2-甲酸(作为磁性配体)修饰的磁性铁纳米粒子上,并通过一系列光谱技术证实了其结构;然后在下一步中,评估了该纳米复合材料[Fe 3 O 4 @Dop/Amide-BenzImid-CuBr 2 ]在咪唑并[1,2-a]吡啶和吡喃吡唑衍生物多组分合成中的催化活性。结果清楚地表明,这种磁性纳米催化剂在水溶剂中在回流条件下是合成咪唑并[1,2-a]吡啶和吡喃吡唑的非常有效的催化体系,因为所有产物都在合适的时间内以高至优异的产率合成。的时间。此外,回收测试证实Fe 3 O 4 @Dop/Amide-BenzImid-CuBr 2催化剂可以重复使用多达8次,而不会显着降低其催化效率。 VSM和ICP-O