Metal‐Free Synthesis of 4‐Aryl‐2‐quinolone Derivatives by Iodine‐Mediated Intramolecular C−H Amidation
作者:Subhankar Ghosh、Shital K. Chattopadhyay
DOI:10.1002/adsc.201900530
日期:2019.10.22
A metal‐free synthesis of a range of 4‐aryl‐2‐quinolone derivatives has been developed which utilizes an iodine‐mediated intramolecular C−H amidation of 3,3‐diarylacryl amides as the key step. Electron‐withdrawing or ‐donating substituents in either of the aryl rings display marginal influence on the course of the reaction. However, the presence of the diarylalkene moiety has been found to be crucial
已经开发出了一系列无金属的4-芳基-2-喹诺酮衍生物,利用碘介导的3,3-二芳基丙烯酰胺的分子内CH酰胺化反应为关键步骤。任一芳环中的吸电子或给电子取代基对反应过程都显示出很小的影响。然而,已经发现二芳基烯烃部分的存在对于反应的成功至关重要。该反应以非常好的收率进行,并且适用于多种底物。此外,该方法克服了与金属介导的方法相关的一些困难,例如区域异构产物的形成和E-Z异构化。我们提出了一种机制,该机制涉及就地生成次碘酸作为正碘的来源。