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.
Niacin as a Potent Organocatalyst towards the Synthesis of Quinazolines Using Nitriles as C-N Source
作者:Raghuram Gujjarappa、Nagaraju Vodnala、Velma Ganga Reddy、Chandi C. Malakar
DOI:10.1002/ejoc.201901651
日期:2020.2.21
An organocatalyzed protocol has been described for the comprehensive synthesis of 2‐substituted quinazolines usingnitriles as C–N source. The developed reaction conditions are suitable for a wide range of substrates providing the desired products in excellent yields.
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
iridium-catalyzed acceptorless dehydrogenative coupling (ADC) reaction for the preparation of various quinazolines from 2-aminoarylmethanols and amides or nitriles had been developed. A wide range of substituted 2-aminobenzyl alcohols and (hetero)aryl or alkyl benzamides and nitriles were well compatible to afford various quinazolines in excellent yields. Merits of this new strategy are the high atom-economy, mild
Iridium supported on porous polypyridine-oxadiazole as high-activity and recyclable catalyst for the borrowing hydrogen reaction
作者:Jiahao Li、Anruo Mao、Wei Yao、Haiyan Zhu、Dawei Wang
DOI:10.1039/d2gc00190j
日期:——
HRTEM, SEM, and XPS, and revealed high catalytic activity for the reaction of dimethyl-6-aminouracil with benzylalcohols, 1,3-dimethylbarbituric acid with benzylalcohols and 2-aminobenzylamine and benzylalcohols through dehydrogenation and the borrowinghydrogenstrategy with alcohol or water as the solvent. In addition, this PPO-Ir catalyst could be recycled and reused without a manifest loss of