A direct C–H alkylation of quinoxalinones at the C‐3 position with sodiumalkylsulfinates and phenyliodine(III) dicarboxylates has been developed under catalyst‐free conditions. A series of 3‐alkylquinoxalinones were afforded in moderate to excellent yields in this protocol, which offers a practical and efficient access to biologically interesting 3‐alkylquinoxalin‐2(1H)‐one derivatives.
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
<i>N</i>,<i>N</i>,<i>N</i>’,<i>N</i>’-Tetramethylethylenediamine-Enabled Photoredox-Catalyzed C–H Methylation of <i>N</i>-Heteroarenes
作者:Fang Liu、Zhi-Peng Ye、Yuan-Zhuo Hu、Jie Gao、Lan Zheng、Kai Chen、Hao-Yue Xiang、Xiao-Qing Chen、Hua Yang
DOI:10.1021/acs.joc.1c01325
日期:2021.9.3
Aiming at the valuable methylation process, readily available and inexpensive N,N,N′,N′-tetramethylethylenediamine (TMEDA) was first identified as a new methyl source in photoredox-catalyzed transformation in this work. By virtue of this simple methylating reagent, a facile and practical protocol for the direct C–H methylation of N-heteroarenes was developed, featuring mild reaction conditions, broad
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。
Metal-free alkylation of quinoxalinones with aryl alkyl ketones
The first metal-free method for alkylation of quinoxalinones using cheap and stable aryl alkyl ketones as nucleophilic alkylation reagents is reported. This strategy greatly broadens the application channels of aryl alkyl ketones through carbon–carbon bond activation. In addition, the protocol has the advantages of simple operation, broad substrate scope, and good functional group tolerance.