Regioselective C-H functionalization on quinolines is of high interest to lead to value-added products. Herein, we describe the development of Ru-catalyzed deoxygenative regioselective C8 arylation of quinoline N-oxides with arylboronic esters. Mechanistic studies revealed that it proceeds in a tandem process of arylation and then deoxygenation, wherein both steps were found to be catalytic with the
Metal‐Free Visible‐Light Catalytic Deoxygenation of Azaaryl N‐Oxides: Harnessing Photons for Efficient Greener Synthesis
作者:Susanta Mandal、Kimron Protim Phukan、Joneswar Basumatary、Biswajit Gopal Roy
DOI:10.1002/asia.202400147
日期:——
to get back the desired substituted azaarenes. An efficient metal-free visible-light photo-redox catalytic deoxygenation of N-oxides of azaheterocyclic compounds has been developed using acridinium based organo-photocatalyst in blue LED light. High efficiency and mildness of this methodology has been demonstrated through higher deoxygenation yield of wide variety of azaheterocyclic N-oxides with reactive
缺电子氮杂芳烃的区域选择性和化学选择性官能化通常需要将其转化为相应的N-氧化物,并随后在官能化后去除氧以得到所需的取代的氮杂芳烃。使用吖啶基有机光催化剂在蓝色 LED 光下开发了一种高效的无金属可见光光氧化还原催化氮杂环化合物N氧化物脱氧的方法。该方法的高效性和温和性已通过多种具有反应性官能团的氮杂环N-氧化物的较高脱氧产率得到证明。光催化还原的稳健性已通过将反应轻松放大至克级而得到证明,且反应产率没有太大变化。
SENCZUK L., ACTA POL. PHARM., 43,(1986) N 2, 131-133
作者:SENCZUK L.
DOI:——
日期:——
Efficient visible light mediated synthesis of quinolin-2(1<i>H</i>)-ones from quinoline<i>N</i>-oxides
作者:Susanta Mandal、Samuzal Bhuyan、Saibal Jana、Jagir Hossain、Karan Chhetri、Biswajit Gopal Roy
DOI:10.1039/d1gc01460a
日期:——
Quinolin-2(1H)-ones are one of the important classes of compounds due to their prevalence in natural products and in pharmacologically useful compounds. Here we present an unconventional and hitherto unknown photocatalytic approach to their synthesis from easily available quinoline-N-oxides. This reagent free highly atom economical photocatalytic method, with low catalyst loading, high yield and no