A mild, environmentally friendly, and regioselective acylation of heterocycles with inexpensive carboxylic acids is reported via photoredox catalysis. The strategy is highlighted with good functional group tolerance and substrate scope which could rapidly realize the acylation of various heterocyclic compounds.
Radical C−H Acylation of Nitrogen Heterocycles Induced by an Aerobic Oxidation of Aldehydes
作者:Subhasis Paul、Manotosh Bhakat、Joyram Guin
DOI:10.1002/asia.201900857
日期:2019.9.16
ketones is described herein. The reaction involves cross-dehydrogenative coupling between aldehydes and heteroaromatic bases with molecularoxygen (O2 ). The key aspect of the method is the generation of reactive acyl radical via homolytic activation of aldehyde C-H bond using O2 as the sole oxidant. The reaction has a good substrate scope with respect to aldehydes and functionalized nitrogen heterocycles
Exploring Eosin Y as a bimodular catalyst: organophotoacid mediated Minisci-type acylation of <i>N</i>-heteroarenes
作者:Vishal Jyoti Roy、Partha Pratim Sen、Sudipta Raha Roy
DOI:10.1039/d1cc06483e
日期:——
conditions. Spectroscopic investigations such as steady state fluorescence quenching and dynamic lifetime quenching experiments were employed to better understand the role of Eosin Y as both a photoredox catalyst and a photoacid. Feedstock aldehydes were employed as acyl radical precursors for engaging in C–C bond formation reactions with a variety of nitrogen containing heterocycles.
在这里,我们报告了伊红 Y 作为 Minisci 型酰化反应的双模块催化剂。发现在光激发的曙红 Y 和N-杂芳烃之间形成有机激发物是优化条件下光酸催化的稳定因素。采用光谱研究,例如稳态荧光猝灭和动态寿命猝灭实验,以更好地了解曙红 Y 作为光氧化还原催化剂和光酸的作用。原料醛被用作酰基自由基前体,用于与各种含氮杂环进行 C-C 键形成反应。