针对有价值的甲基化过程,在这项工作中首次将易于获得且价格低廉的N , N , N' , N' -四甲基乙二胺(TMEDA) 确定为一种新的甲基化来源。凭借这种简单的甲基化试剂,开发了一种简便实用的N-杂芳烃直接 C-H 甲基化方案,具有反应条件温和、底物范围广和可扩展性等特点。机理研究表明,基本上涉及顺序光氧化还原、碱基辅助质子转移、碎裂和互变异构化过程。
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。
Iron-catalyzed methylation of quinoxalin-2(1H)-ones with dimethyl sulfoxide under visible light irradiation
作者:Hong He、Zhongyi Zhang、Yicheng Zhang、Chao Zhou、Jie Liu、Lei Wang
DOI:10.1016/j.mcat.2024.113999
日期:2024.4
The synthesis of iron-catalyzed -methylation of quinoxalin-2(1)-ones using dimethyl sulfoxide as the methylating reagent is described herein. The cross-coupling reactions proceeded smoothly under visible-light irradiation, which generated the corresponding products in moderate to good yields. Further investigation on the application of the methylation reaction using readily available DMSO as the methylation
Synthesis of Substituted 1,3-Dimethyl-1H-quinoxalin-2-ones from Aniline Derivatives
作者:Xun Li、Donghua Wang、Jifeng Wu、Wenfang Xu
DOI:10.3987/com-05-10461
日期:——
Substituted 1,3-dimethyl-1H-quinoxalin-2-ones (7) have been synthesized through the procedures of acylation, nitration, reduction, intramolecular alkylation, oxidation, and N-methylation starting from 3,4-disubstituted aniline.