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
Powdered diethylaminoethyl cellulose as biomass-derived support for phosphotungstic acid: new solid acidic catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones
作者:Shaokang Li、Qianqian Zhang、Yanqing Peng
DOI:10.1007/s00706-015-1475-y
日期:2015.11
as solvent. Phosphotungstic acid anchored on the powdered diethylaminoethyl cellulose can be used as a biopolymer-supported solid acidic catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones fromisatoicanhydride, amines, and aldehydes. The catalyst could be easily recovered by simple filtration and reused several times with minor decreases in the reactionyields. Graphical abstract
Silica Supported Zinc (II) Chloride (SiO<sub>2</sub>-ZnCl<sub>2</sub>) as an Efficient Catalyst for the Eco-Friendly Synthesis of 2,3-Dihydroquinazolin-4(1H)-Ones
作者:MAJID GHASHANG
DOI:10.13005/ojc/280317
日期:2012.9.18
Silica supported zinc (II) chloride (SiO2-ZnCl2) as an efficient and non-toxic heterogeneouscatalyst have been used for the simple and facilesynthesis of 2,3-dihydroquinazolin-4(1H)-ones through the direct cyclo-condensation of anthranilamide and aldehydes or one-pot three-component cyclo-condensation of isatoic anhydride, ammonium acetate (or amines) and aldehydes under solvent-free conditions.
An efficient method for the synthesis of a series of 2,3‐disubstituted‐2,3‐dihydroquinazolin‐4(1H)‐ones is described via one‐pot condensation reaction of isatoic anhydride, aryl aldehydes, and primary amines using a Brønsted acidic ionic liquid, [Hmim][NO3], as a catalyst and medium. The present protocol enjoys convenient reaction and simple work‐up, greenness, short reaction times, and reusable catalyst
A Q-tube assisted, efficient method for the preparation of 2-phenylquinazolin-4-ones is here presented. The target structures were prepared through the one-pot, multicomponent reaction between isatoic anhydride, an aromatic aldehyde and a primary amine following a catalyst-free approach. The use of the commercially available Q-tube(C) apparatus allowed to perform reactions at external temperature higher to the solvent boiling point generating medium pressure conditions, shortening the reaction times and affording good yields in all the example herein reported.[GRAPHICS].