Iron-catalyzed oxidative synthesis of N-heterocycles from primary alcohols
作者:Dan Zhao、Yu-Ren Zhou、Qi Shen、Jian-Xin Li
DOI:10.1039/c3ra46363j
日期:——
An iron-catalyzed one-pot one-step oxidative system has been successfully developed in the conversion of primary alcohols into nitrogen-containing heterocycles, such as quinazolinone, quinazoline and 3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide derivatives.
在伯醇转化为含氮杂环(如喹唑啉酮,喹唑啉和3,4-二氢-2 H -1,2,4-苯并噻二嗪)中,已成功开发出铁催化的一锅一步氧化系统。1,1-二氧化物衍生物。
Synthesis of 2-substituted quinazolines by CsOH-mediated direct aerobic oxidative cyclocondensation of 2-aminoarylmethanols with nitriles in air
atom-efficient synthesis of 2-substituted quinazolines is developed by a CsOH-mediated direct aerobic oxidative reaction of the readily available and stable 2-aminoarylmethanols and nitriles. Effectively working as the promoter in the alcohol oxidation, nitrile hydration, and cyclocondensation steps, CsOH is the best base for the reaction. A similar method can also be extended to the synthesis of substituted
Cooperative iridium complex-catalyzed synthesis of quinoxalines, benzimidazoles and quinazolines in water
作者:Kaushik Chakrabarti、Milan Maji、Sabuj Kundu
DOI:10.1039/c8gc03744b
日期:——
Herein, an efficient methodology for the synthesis of a diverse class of N-heterocyclic moieties, such as quinoxalines, benzimidazoles and quinazolines, was developed in water using bio-renewable alcohols. The quinoxalines were successfully synthesized from a wide range of diamines and nitroamines with diols in air. Interestingly, benzimidazoles and quinazolines were synthesized with excellent isolated
range of quinazoline derivatives was fabricated with excellent yields using 0.5 mol% Pd(II) catalyst loading. The catalyticcoupling process was performed under aerobic conditions and water is the only by-product. With data from the control experiments, a plausible mechanism for the dehydrogenative coupling reaction was proposed via a cyclic aminal intermediate through the oxidation of alcohol to aldehyde
报道了一种新的钯 ( II ) N、N、O型配合物促进喹唑啉单锅级联合成,通过容易获得的醇和 2-氨基苄胺的脱氢偶联。一组独特的 Pd( II ) 配合物 ( 1-2 ) 被合成并通过分析和光谱技术表征。单晶 X 射线衍射研究证实了钯离子周围的方形平面几何形状。使用 0.5 mol% Pd( II) 催化剂负载。催化偶联过程在有氧条件下进行,水是唯一的副产品。与来自对照实验的数据,脱氢偶联反应的可行的机制,提出了通过环状缩醛胺中间体通过醇氧化成醛。克级合成证明了所提出协议的有效性。
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.