Lewis-Acid-Catalysed Activation of Nitriles: A Microwave-Assisted Solvent-Free Synthesis of 2,4-Disubstituted Quinazolines and 1,3-Diazaspiro[5.5]undec-1-enes
A single‐step, solvent‐free, and transition‐metal‐free reaction for the synthesis of quinazolines/quinazolinones starting from 2‐amino carbonyl compounds, and of 1,3‐diazaspiro[5.5]undec‐1‐ene derivatives starting from N‐tosyl‐2‐(cyclohexenyl)ethylamines, is reported. The Lewis‐acid‐catalysed activation of nitriles is a key feature of this reaction.
An Efficient Three-component, One-pot Synthesis of Quinazolines under Solvent-free and Catalyst-free Condition
作者:Subrahmanya Ishwar Bhat、U. K. Das、Darshak R. Trivedi
DOI:10.1002/jhet.2220
日期:2015.7
protocol for the synthesis of quinazolines in the absence of solvent and catalyst has been developed. 2,4‐Disubstituted quinazolines have been synthesized from three‐component one‐pot reactions of 2‐aminoaryl ketones, orthoesters, and ammonium acetate. The present method has advantages of operational simplicity, substrate generality, clean reaction, high yields (76–94%), and moderate reaction time. The plausible
Microwave-promoted efficient synthesis of dihydroquinazolines
作者:Rupam Sarma、Dipak Prajapati
DOI:10.1039/c0gc00838a
日期:——
A solvent- and catalyst-free synthesis of dihydroquinazolines is described. 2,4-Disubstituted-1,2-dihydroquinazolines can be readily obtained from 2-aminobenzophenone and aldehydes under microwave irradiation using urea as an environmentally benign source of ammonia, with a small amount of the corresponding quinazolines as the minor product. The reaction is simple, clean and excellent yields are obtained within minutes.