Accessing Polysubstituted Quinazolines via Nickel Catalyzed Acceptorless Dehydrogenative Coupling
作者:Seuli Parua、Rina Sikari、Suman Sinha、Gargi Chakraborty、Rakesh Mondal、Nanda D. Paul
DOI:10.1021/acs.joc.8b01479
日期:2018.9.21
easy to prepare nickel catalysts, containing tetraaza macrocyclic ligands (tetramethyltetraaza[14]annulene (MeTAA) or 6,15-dimethyl-8,17-diphenyltetraaza[14]annulene (MePhTAA)) are reported. A wide variety of substituted quinazolines were synthesized in moderate to high yields starting from cheap and easily available starting precursors. A few control reactions were performed to understand the mechanism
Efficient synthesis of quinazolines by the iron-catalyzed acceptorless dehydrogenative coupling of (2-aminophenyl)methanols and benzamides
作者:Shi-Qi Zhang、Yao Cui、Bin Guo、David J. Young、Ze Xu、Hong-Xi Li
DOI:10.1016/j.tet.2020.131825
日期:2021.1
The acceptorless dehydrogenation coupling (ADC) of (2-aminophenyl)methanols with benzamides was achieved with catalytic FeCl2·4H2O in an efficient synthesis of quinazolines. This simple catalytic system is atom-economical, environmentally benign and suited to a variety of substrates.
Dehydrogenative Synthesis of Quinolines, 2-Aminoquinolines, and Quinazolines Using Singlet Diradical Ni(II)-Catalysts
作者:Gargi Chakraborty、Rina Sikari、Siuli Das、Rakesh Mondal、Suman Sinha、Seemika Banerjee、Nanda D. Paul
DOI:10.1021/acs.joc.8b03070
日期:2019.3.1
Simple, straightforward, and atom economic methods for the synthesis of quinolines, 2-aminoquinolines, and quinazolines via biomimetic dehydrogenative condensation/coupling reactions, catalyzed by well-defined inexpensive and easy to prepare singletdiradical Ni(II)-catalysts featuring two antiferromagnetically coupled singletdiradical diamine type ligands are described. Various polysubstituted quinolines
Nickel-Catalyzed [4 + 2] Annulation of Nitriles and Benzylamines by C–H/N–H Activation
作者:Rina Sikari、Gargi Chakraborty、Amit Kumar Guin、Nanda D. Paul
DOI:10.1021/acs.joc.0c02069
日期:2021.1.1
Nickel-catalyzed [4 + 2] annulation of benzylamines and nitriles via C–H/N–H bond activation, providing straightforward atom-economic access to a wide variety of multisubstituted quinazolines, is reported. Mechanistic investigation revealed that the in situ formed amidines from the coupling of benzylamines and nitriles direct the nickel catalyst to activate the ortho-C–H bond of the phenyl ring of
Electrochemical Acceptorless Dehydrogenation of N-Heterocycles Utilizing TEMPO as Organo-Electrocatalyst
作者:Yong Wu、Hong Yi、Aiwen Lei
DOI:10.1021/acscatal.7b04137
日期:2018.2.2
Catalytic acceptorless dehydrogenation (CAD) has been a basically important organic transformation to ubiquitous unsaturated compounds without the usage of a sacrificial hydrogen acceptor. In this work, we successfully developed the first electrochemical acceptorless dehydrogenation (ECAD) of N-heterocycles using TEMPO as the organo-electrocatalyst. We have achieved the catalyticdehydrogenation of