合成了以双环喹喔啉为基本核心结构的新型富氮化合物,1-{[[1-(3-叠氮基-2-羟基丙基)-1 H -1,2,3-三唑-4-基]甲基}式C 15 H 16 N 8 O 2的-3-甲基1,2-二氢喹喔啉-2-,并对其结构和化学反应性方面进行了全面讨论。通过单晶分析和计算方法评估了超分子组装中弱非共价相互作用的性质,作用和相对贡献。有关全局和局部反应性的有用信息,可从概念密度泛函理论在wB97X-D / cc-pVDZ级别获得。研究的系统可以在极性有机反应中充当强亲电试剂和/或中等亲核试剂。我们希望这项研究将对喹喔啉和喹喔啉衍生物的合成和化学知识提供更深入的了解。
Peroxide-mediated site-specific C–H methylation of imidazo[1,2-<i>a</i>]pyridines and quinoxalin-2(1<i>H</i>)-ones under metal-free conditions
作者:Shengzhou Jin、Hua Yao、Sen Lin、Xiaoqing You、Yao Yang、Zhaohua Yan
DOI:10.1039/c9ob02328c
日期:——
An effective approach to realize the direct methylation of imidazo[1,2-a]pyridines and quinoxalin-2(1H)-ones with peroxides under metal-free conditions is described.
Visible-light induced decarboxylative alkylation of quinoxalin-2(1<i>H</i>)-ones at the C3-position
作者:Wenxuan Xue、Yingpeng Su、Ke-Hu Wang、Rong Zhang、Yawei Feng、Lindan Cao、Dangfeng Huang、Yulai Hu
DOI:10.1039/c9ob01169b
日期:——
simple and efficient method for the visible light induced direct carbon alkylation of quinoxalin-2(1H)-ones at the C3 position is described. This protocol employs cheap and readily available phenyliodine(III) dicarboxylates as the alkylation reagents to conduct decarboxylative radical coupling reaction with quinoxalin-2(1H)-ones. The process exhibits excellent compatibility to functional groups and
Alkylation of quinoxalin-2(1<i>H</i>)-ones using phosphonium ylides as alkylating reagents
作者:Sha Peng、Jun-Jia Liu、Luo Yang
DOI:10.1039/d1ob01858b
日期:——
through base promoted direct alkylation of quinoxalin-2(1H)-ones with phosphonium ylides as alkylating reagents under metal- and oxidant-free conditions was developed. Various 3-alkylquinoxalin-2(1H)-ones were easily obtained in good to excellent yields. Tentative mechanistic studies suggest that this reaction is likely to involve a nucleophilic addition–elimination process.
开发了一种实用且有效的方法,用于通过碱促进 quinoxalin-2(1 H )-ones 在无金属和无氧化剂条件下作为烷基化试剂直接烷基化 quinoxalin-2(1 H )-ones。各种 3-烷基喹喔啉-2(1 H )-酮很容易以良好至优异的产率获得。初步的机理研究表明,该反应可能涉及亲核加成 - 消除过程。
Visible-light-induced decarboxylative alkylation of quinoxalin-2(1H)-ones with phenyliodine(III) dicarboxylates by cerium photocatalysis
Ru complexes, the discovery and employment of photocatalysts based on alternative and abundant metal salts remain highly necessary. Herein, the visible-light-induced decarboxylative alkylation of quinoxalin-2(1H)-ones with phenyliodine(III) dicarboxylate has been accomplished using inexpensive and catalytic amount of CeCl3 as the photocatalyst. The novel protocol has advantages of mild conditions,
尽管在使用有机染料或昂贵的 Ir 和 Ru 配合物的光氧化还原催化方面取得了进展,但基于替代和丰富的金属盐的光催化剂的发现和应用仍然非常必要。在此,使用廉价且催化量的CeCl 3作为光催化剂,已经完成了喹喔啉-2(1 H )-酮与苯碘(III)二羧酸盐的可见光诱导的脱羧烷基化反应。该新方案具有条件温和、产率高、底物范围好等优点。对照实验表明,一种激进的机制是造成目前转变的原因。