A one-pot I2-mediated annulation reaction of substrates containing diamino groups and aldehydes has been developed viaoxidativeC–Nbondformation. This general and environmentally benign synthetic approach provides facile access to a variety of 1,3-diazaheterocyclic compounds, including quinazolinones, benzimidazoles, and cyclic amidines.
One-pot synthesis of 4(3H)-quinazolinones from azides, alkynes, anilines, and carbon monoxide
作者:Yang Shen、Chao Han、Shuying Cai、Ping Lu、Yanguang Wang
DOI:10.1016/j.tetlet.2012.08.045
日期:2012.10
A one-potsynthesis of 4(3H)-quinazolinones from terminal alkynes, sulphonyl azide, o-iodoanilines, and carbon monoxide has been developed. This cascade process includes the copper-catalyzed three-component reaction of alkyne, azide and amine, the palladium-catalyzed carbonylation, and the Lewis acid catalyzed hydrolysis of sulfonamide.
New Pincer type Pd(II) complex [Pd(NNO)(PPh3)] (1) prompted synthesis of quinazolinones via dehydrogenative coupling of readily accessible alcohols, and o-aminobenzamide is described. A diverse range of quinazolinones has been synthesized efficiently with good to excellent yields employing low catalyst loading (0.5 mol%) under the aerobic condition without any additives/oxidants. A plausible mechanism
The cascade synthesis of quinazolinones and quinazolines using an α-MnO<sub>2</sub> catalyst and tert-butyl hydroperoxide (TBHP) as an oxidant
作者:Zhe Zhang、Min Wang、Chaofeng Zhang、Zhixin Zhang、Jianmin Lu、Feng Wang
DOI:10.1039/c5cc02785c
日期:——
Heterogeneously catalyzed synthesis of quinazolinones or quinazolines is reported in this study.
这项研究报告了喹唑啉酮或喹唑啉的非均相催化合成。
Electro-oxidative cyclization: access to quinazolinones <i>via</i> K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> without transition metal catalyst and base
作者:Yongzhi Hu、Huiqing Hou、Ling Yu、Sunying Zhou、Xianghua Wu、Weiming Sun、Fang Ke
DOI:10.1039/d1ra05092c
日期:——
A K2S2O8-promoted oxidative tandem cyclization of primary alcohols with 2-aminobenzamides to synthesize quinazolinones was successfully achieved under undivided electrolytic conditions without a transition metal and base. The key feature of this protocol is the utilization of K2S2O8 as an inexpensive and easy-to-handle radical surrogate that can effectively promote the reaction via a simple procedure
AK 2 S 2 O 8促进了伯醇与2-氨基苯甲酰胺的氧化串联环化以合成喹唑啉酮,在没有过渡金属和碱的不分电解条件下成功实现。该协议的主要特点是利用 K 2 S 2 O 8作为一种廉价且易于处理的自由基替代物,可以通过简单的程序有效地促进反应,从而通过形成氮杂环在恒定电流下以一锅法在室温下直接氧化环化。由于使用了连续流动的电化学装置,这种绿色、温和、实用的电合成具有高效率和优异的官能团耐受性,并且易于放大。