AbstractThe preparation and characterization of cobalt aluminate (CoAl2O4) magnetic nanoparticles and its application as a catalyst for the synthesis of a novel class of pyrazol-quinazolinones and 2,3-dihydroquinazolin-4(1H)-ones is described. The structure of the catalyst was studied by Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray diffraction, and vibrating sample
摘要描述了铝酸钴(CoAl 2 O 4)磁性纳米颗粒的制备,表征及其在合成新型吡唑-喹唑啉酮和2,3-二氢喹唑啉-4(1H)-ones催化剂中的应用。通过傅里叶变换红外光谱,透射电子显微镜,X射线衍射和振动样品磁力计分析研究了催化剂的结构。所得的铝酸钴(CoAl 2 O 4)是有效的催化剂,并以良好至优异的产率提供了所需的产物。而且,该催化剂可以容易地通过磁分离回收并循环四次而不会显着损失其催化活性。 图形摘要以CoAl 2 O 4为纳米颗粒非均相催化剂,在乙醇回流条件下,通过等规酸酐,芳族醛和胺的一锅缩合反应,合成了2,3-二氢喹唑啉-4(1H)-和一类新型的吡唑-喹唑啉酮。
Application of the ultrasound in the mild synthesis of substituted 2,3-dihydroquinazolin-4(1H)-ones catalyzed by heterogeneous metal–MWCNTs nanocomposites
作者:Javad Safari、Soheila Gandomi-Ravandi
DOI:10.1016/j.molstruc.2014.05.002
日期:2014.8
Abstract A practical method were applied successfully to synthesize mono- and disubstituted dihydroquinazolinones through three-component condensation of isatoic anhydride, primary amines or ammonium acetate with aromatic aldehydes in the presence of some transition metals–multi-walled carbon nanotubes under sonication. Also, metals supported on MWCNTs showed excellent catalytic performance for above-mentioned
2,3‐Dihydroquinazolin‐4(1H)‐one derivatives were synthesized via a one‐pot, three component reaction of isatoic anhydride and an aromatic aldehyde with ammonium acetate or primary amine catalyzed by silica‐bonded S‐sulfonic acid in ethanol at 80°C. The reaction work‐up is simple and the catalyst is easily separated from the products by filtration. The heterogeneous catalyst was recycled for ten runs
Microwave-accelerated three components cyclocondensation in the synthesis of 2,3-dihydroquinazolin-4(1H)-ones promoted by Cu-CNTs
作者:Javad Safari、Soheila Gandomi-Ravandi
DOI:10.1016/j.molcata.2013.01.031
日期:2013.5
Cu-CNTs efficiently catalyzes condensation reaction of isatoic anhydride, aldehydes, and primary amines or ammonium acetate to afford the corresponding 2,3-dihydroquinazolin-4(1H)-one derivatives successfully in high yield. The protocol proves to be efficient and environmentally benign in terms of very easy work-up, high yields, and ease of recovery of catalyst. In addition, the present method is superior in terms of green media, the amount of catalyst and reaction time. (C) 2013 Elsevier B.V. All rights reserved.
The Synthesis of 2,3-Dihydroquinazolin-4(1h)-Ones using Zinc Oxide Nanotubes Modified by Sio2 as A Catalyst with Recyclable Effect
作者:Rakhshan Hakimelahi、Mohammad H. Mousazadeh
DOI:10.13005/ojc/340109
日期:2018.2.28
zinc oxid nano tubes have attracted much attention in recent years. Hardly, direct uses of zinc oxid nano tubes which modified by SiO2 as a catalyst with recyclability has been applied for several organic reactions. The average particle size of ZnO catalysts is 57 nm, it has been characterized by XRD. Nano tubes surfaces have high density defects. The condensation of isatoic anhydride and an aromatic aldehyde exposed to ammonium acetate in the presence of few amounts of zinc oxid nano tubes modified by SiO2 as a catalyst can be a simple, suitable and efficient method for the quinazolin derivatives synthesis, the positive aspect is recyclable ability of the catalyst. It is clear that some characterization of catalyst such as combination of the small particle size and high-density surface defects of zinc oxid nano tubes which modified by SiO2 is the basic reason for unique catalytic activity of the catalyst. The practical and simple method led to unbeatable yields of the 2,3-Di hydro quinazolin-4(1H)-one derivatives at short times under mild conditions.