Microwave-promoted one-pot three-component synthesis of 2,3-dihydroquinazolin-4(1H)-ones catalyzed by heteropolyanion-based ionic liquids under solvent-free conditions
3-dihydroquinazoline-4(1H)-one derivatives have been synthesized via one-pot three-component reaction using isatoic anhydrides, amines and aldehydes (or ketones) catalyzed by heteropolyanion-based ionic liquids under microwave-promoted conditions. The practical protocol was found to tolerate a wide range of substrates with different functional groups. Moderate to excellent yields, solvent-free media and operational
Gallium(III) triflate-catalyzed one-pot selective synthesis of 2,3-dihydroquinazolin-4(1H)-ones and quinazolin-4(3H)-ones
作者:Jiuxi Chen、Dengze Wu、Fei He、Miaochang Liu、Huayue Wu、Jinchang Ding、Weike Su
DOI:10.1016/j.tetlet.2008.03.127
日期:2008.6
A series of 2,3-dihydroquinazolin-4(1H)-ones and quinazolin-4(3H)-ones have been synthesized in good to excellent yields and high selectivity by one-pot reaction using isatoic anhydride, ammonium acetate (or amines), and aldehydes in ethanol or in DMSO under mild conditions, respectively. The reaction was efficiently promoted by 1 mol % Ga(OTf)3 and the catalyst could be recovered easily after the
An efficient, practical and atom-efficient method has been developed for the preparation of β-aminoketones and 2,3-dihydroquinazoline-4(1H)-ones via multicomponent one-pot reaction in starch solution as an entirely green catalyst. The advantages of this novel protocol are high yields, short reaction time, simple methodology, easy work-up and purification, lack of toxicity and eco-friendly catalyst. .
bis(indolyl)methanes was developed using 3,5-bis(trifluoromethyl) phenyl ammonium hexafluorophosphate (BFPHP) as a novel organocatalyst. MATERIALS AND METHODS All of the obtained products are known compounds and identified by IR, 1HNMR, 13CNMR and melting points. RESULT Various products were obtained in good to excellent yields under reaction conditions. CONCLUSION The BFPHP organocatalyst demonstrates a novel class
Supported ceric ammonium nitrate: A highly efficient catalytic system for the synthesis of diversified 2,3-substituted 2,3-dihydroquinazolin-4(1H)-ones
作者:Someshwar D. Dindulkar、Jeongsu Oh、Veenita M. Arole、Yeon Tae Jeong
DOI:10.1016/j.crci.2013.11.008
日期:2014.10
Résumé A practically expeditious protocol has been developed for the cascade synthesis of 2,3-dihydroquinazolin-4(1H)-ones via the condensation of 2-aminobenzamide/2-aminobenzanilide and aromatic aldehydes using a catalytic amount of silica-supported ceric ammonium nitrate. This method affords rapid transformation at room temperature with good to excellent yields. Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.doc