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
Copper-Catalyzed Regioselective Cascade Alkylation and Cyclocondensation of Quinoline <i>N</i>
-Oxides with Diazo Esters: Direct Access to Conjugated π-Systems
An inexpensive copper‐catalyzed cascade regioselective alkylation, followed by cyclocondensation of quinoline N‐oxides with α‐diazo esters has been achieved successfully to provide heteroarene‐containing conjugated π‐systems. The developed method is simple, straightforward, and economical with a broad range of substrate scope. The dual role of copper catalyst in the C−H bond functionalization and in
Regioselective Cyanation of Six‐Membered<i>N</i>‐Heteroaromatic Compounds Under Metal‐, Activator‐, Base‐ and Solvent‐Free Conditions
作者:Bikash Kumar Sarmah、Monuranjan Konwar、Dipanjan Bhattacharyya、Priyanka Adhikari、Animesh Das
DOI:10.1002/adsc.201901103
日期:2019.12.17
regioselective cyanation of heteroaromatic N‐oxides with trimethylsilyl cyanide has been developed to obtain 2‐substituted N‐heteroaromatic nitrile without the requirement of any external activator‐, metal‐, base‐, and solvent. The present protocol is a straightforward, one‐pot heteroaromatic C−H cyanation process, and proceeds smoothly in conventional heating but also under microwave irradiation with shorter