Hydrogen peroxide-mediated synthesis of 2,4-substituted quinazolines <i>via</i> one-pot three-component reactions under metal-free conditions
作者:Khang H. Trinh、Khang X. Nguyen、Phuc H. Pham、Tung T. Nguyen、Anh N. Q. Phan、Nam T. S. Phan
DOI:10.1039/d0ra05040g
日期:——
An efficient metal-free synthesis of 2,4-substituted quinazolines via a hydrogen peroxide-mediated one-pot three-component reaction of 2-aminoaryl ketones, aldehydes, and ammonium acetate has been developed. The transformation proceeded readily under mild conditions in the presence of commercially available hydrogen peroxide. The significant advantages of this approach are (1) the readily available
Catalyst-free synthesis of quinazoline derivatives using low melting sugar–urea–salt mixture as a solvent
作者:Zhan-Hui Zhang、Xiao-Nan Zhang、Li-Ping Mo、Yong-Xiao Li、Fei-Ping Ma
DOI:10.1039/c2gc35258c
日期:——
of maltose–dimethylurea (DMU)–NH4Cl was found to be an inexpensive, non-toxic, easily biodegradable and effective reaction medium in the catalyst-freesynthesis of quinazolinederivatives. This simple and efficient method furnished the corresponding quinazolines in high yields via one-pot three-component reaction of 2-aminoaryl ketones, aldehyde, and ammonium acetate under aerobic oxidation conditions
The invention relates to compounds of formula (A) and formula (I):
or a salt thereof, wherein R
1
, R
2
, R
10
, R
11
, R
12
, R
13
, R
14
, R
15
, R
16
, q and p are as described herein. Compounds of formula (A), formula (I), and pharmaceutical compositions thereof are αvβ6 integrin inhibitors that are useful for treating fibrosis such as idiopathic pulmonary fibrosis (IPF) and nonspecific interstitial pneumonia (NSIP).
Fe–FeO<sub><i>x</i></sub> nanoparticles encapsulated in N-doped carbon material: a facile catalyst for selective synthesis of quinazolines from alcohols in water
作者:Fei Wang、Fuying Zhu、Enxiang Ren、Qiang Zhang、Guo-Ping Lu、Yamei Lin
DOI:10.1039/d2cy01562e
日期:——
and green synthetic strategies for N-heterocycle synthesis has always been a research hotspot in organic synthesis. A facile one-pot iron-catalyzed synthesis of quinazolinesfrom alcohols in water has been disclosed for the first time, in which a N-doped carbon encapsulated Fe–FeOx material (Fe–FeOx@NC) is applied as a catalyst, and various quinazolines (25 examples, 62–99%) are synthesized. The iron
开发高效、绿色的N-杂环合成策略一直是有机合成领域的研究热点。首次公开了一种简便的铁催化水中醇合成喹唑啉的方法,其中将 N 掺杂碳包覆的 Fe-FeO x材料(Fe-FeO x @NC)用作催化剂,并合成了各种喹唑啉(25 个实例,62-99%)。Fe-FeO x @NC中被氮掺杂碳层包裹的铁纳米颗粒具有很强的抗毒能力,是该反应具有高性能的主要原因。该协议提供了几个优点,包括使用空气作为氧化剂、水作为溶剂、可回收铁作为催化剂以及高原子和步骤经济性。
An efficient synthesis of quinazolines: a theoretical and experimental study on the photochemistry of oxime derivatives
作者:Rafael Alonso、Alegría Caballero、Pedro J. Campos、Diego Sampedro、Miguel A. Rodríguez
DOI:10.1016/j.tet.2010.04.082
日期:2010.6
A new photochemical method for the preparation of quinazolines (2) through irradiation of [2-(methyleneamino)phenyl]methanone oximes (1) is reported. The photoreaction has been studied in depth by experimental, theoretical and photochemical methods. A six-electron electrocyclic ring closure mechanism, followed by water loss, is proposed and rationalized to explain the formation of quinazolines (2). (C) 2010 Elsevier Ltd. All rights reserved.