Can Primary Arylamines Form Enamine? Evidence, α-Enaminone, and [3+3] Cycloaddition Reaction
作者:E. H. Nisala Fernando、Jose Cortes Vazquez、Jacqkis Davis、Weiwei Luo、Vladimir N. Nesterov、Hong Wang
DOI:10.1021/acs.joc.1c01462
日期:2021.11.5
α-enaminone formation suggests that an amine radical cation generated through O2 singlet energy transfer was involved in initiating α-enaminone formation. The reactivity and utility of α-enaminones were explored with a [3+3] cycloaddition reaction of enones affording dihydropyridines in good yields (58–85%). α-Enaminones displayed a set of reactivities that is different from that of enamines. The knowledge
通过核磁共振光谱检测并证实了由伯芳基胺形成烯胺。发现自由基猝灭剂例如(2,2,6,6-四甲基哌啶-1-基)氧化基的存在对于检测烯胺形成是必不可少的。还开发了由伯芳基胺和酮直接合成 α-烯胺酮的方法。α-烯胺酮形成的机理研究表明,通过 O 2产生的胺自由基阳离子单线态能量转移参与了α-烯胺酮的形成。通过烯酮的 [3+3] 环加成反应探索了 α-烯胺酮的反应性和效用,以良好的产率 (58-85%) 提供二氢吡啶。α-烯胺酮表现出一组不同于烯胺的反应性。在这项工作中获得的知识提高了我们对有机化学的基本理解,为烯胺催化提供了见解和新机会。