Silica-supported ceric ammonium nitrate (CAN): a simple, mild and solid-supported reagent for quickest oxidative aromatization of Hantzsch 1,4-dihydropyridines
作者:Parvin Kumar、Kulbir Kadyan、Meenakshi Duhan、Jayant Sindhu、Khalid Hussain、Sohan Lal
DOI:10.1007/s11696-018-0666-5
日期:2019.5
An efficient and environmentally benign methodology for the oxidative aromatization of 1,4-dihydropyridines to their corresponding pyridine derivatives is developed. The oxidative aromatization of 1,4-dihydropyridines was explored using silica-supported ceric ammonium nitrate as catalyst in CH3CN with or without sonication at room temperature. This supported catalyst acts as a more efficient oxidising
开发了一种有效和环境友好的方法,用于将1,4-二氢吡啶氧化成相应的吡啶衍生物。使用二氧化硅负载的硝酸铈铈铵作为催化剂在CH 3 CN中进行室温或不超声处理,探索了1,4-二氢吡啶的氧化芳构化作用。这种负载型催化剂起着更有效的氧化剂的作用,并且在反应时间和收率方面都比其他报道的试剂更具优势。与不支持的形式相比,发现支持的试剂更有效和更具选择性。在本反应中未观察到Belousov–Zhabotinskii反应。在4-正烷基/ n情况下观察到的脱烷基在当前情况下也未观察到-烯基与其他氧化剂的结合。