Copper-Catalyzed Radical Methylation/C–H Amination/Oxidation Cascade for the Synthesis of Quinazolinones
摘要:
A copper-catalyzed radical methylation/sp(3) C-H amination/oxidation reaction for the facile synthesis of quinazolinone was developed. In this cascade reaction, dicumyl peroxide acts not only as a useful oxidant but also as an efficient methyl source. Notably, a methyl radical, generated. from peroxide, was confirmed by electron paramagnetic resonance for the first time.
Convenient synthesis of 2,3-disubstituted quinazolin-4(3H)-ones and 2-styryl-3-substituted quinazolin-4(3H)-ones: applications towards the synthesis of drugs
作者:Dinesh Kumar、Pradeep S. Jadhavar、Manesh Nautiyal、Himanshu Sharma、Prahlad K. Meena、Legesse Adane、Sahaj Pancholia、Asit K. Chakraborti
DOI:10.1039/c5ra03888j
日期:——
Simple, convenient, and green synthetic protocols have been developed for the one pot synthesis of 2,3-disubstituted quinazolin-4(3H)-ones and 2-styryl-3-substituted quinazolin-4(3H)-ones under catalyst and solvent free conditions.
Glyoxylic acid in the reaction of isatoic anhydride with amines: a rapid synthesis of 3-(un)substituted quinazolin-4(3H)-ones leading to rutaecarpine and evodiamine
A dual reactant/catalyst role of glyoxylic acid in the reaction of isatoic anhydride with various amines afforded a novel, robust and rapid synthesis of 3-(un)substituted quinazolin-4(3H)-ones. This metal catalyst-free reaction proceeds via an unusual and unexpected cleavage of C–C bond. A shorter and common route to two alkaloids, that is, rutaecarpine and evodiamine is also accomplished.
Nafion-H: An Efficient and Recyclable Heterogeneous Catalyst for the One-Pot Synthesis of 2,3-Disubstituted 4-(3<i>H</i>)-Quinazolinones under Solvent-Free Microwave Irradiation Conditions
A one-pot synthesis of 2,3-disubstituted 4-(3H)-quinazolinones has been carried out efficiently by the three-component coupling of isatoic anhydride/anthranilic acid, orthoesters, and amines in the presence of Nafion-H (a perfluorinated resin-supported sulfonic acid) as a heterogeneous catalyst. The reaction occurred within a few minutes under solvent-free microwave irradiation conditions to afford
Given the importance of quinazolinones and carbonylative transformations, a palladium‐catalyzed four‐component carbonylativecoupling system for the synthesis of diverse 4(3H)‐quinazolinone in a concise and convergent fashion has been developed. Starting from 2‐bromoanilines (1 mmol), trimethyl orthoformate (2 mmol), and amines (1.1 mmol), under 10 bar of CO, the desired products were isolated in good
Pd/C as an efficient heterogeneous catalyst for carbonylative four-component synthesis of 4(3H)-quinazolinones
作者:Kishore Natte、Helfried Neumann、Xiao-Feng Wu
DOI:10.1039/c5cy00907c
日期:——
activated charcoal (Pd/C) as a heterogeneous catalyst was investigated for the carbonylation of 2-iodoanilines with trimethyl orthoformate and amines via a multicomponent reaction approach, which provided excellent yields of 4(3H)-quinazolinones. It avoids the use of expensive phosphine ligands with an additional advantage of catalyst recovery. Furthermore, >5 new quinazolinone scaffolds containing the trifluoroethyl