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.
DTBP-promoted decarbonylative alkylation of quinoxaline-2(1H)-ones with aldehydes
作者:Bingqing Wang、Hua Yao、Xiaoyang Zhong、Zhaohua Yan、Sen Lin
DOI:10.1016/j.tetlet.2020.152720
日期:2021.2
An efficient DTBP-promoted directalkylation of quinoxaline-2(1H)-ones with aldehydes has been developed under metal-free conditions. The reaction undergoes sequential decarbonylation and radical addition using aliphatic aldehyde as a cheap and abundant alkyl radical source. A convenient and efficient approach for the synthesis of various 3-alkylquinoxaline-2(1H)-ones was provided.
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.
Photoinduced ligand to metal charge transfer enabling cerium mediated decarboxylative alkylation of quinoxalin-2(1<i>H</i>)-ones
作者:Swati Singh、Neha Dagar、Sudipta Raha Roy
DOI:10.1039/d2cc00840h
日期:——
direct use of carboxylic acids to access alkyl radicals. Spectroscopic investigations reveal the photoinduced LMCT and CO2 evolving events. We have utilized a broad range of alkyl carboxylic acids (1° to 3° acids), amino acids and pharmaceutically-important acids as a coupling partner to synthesise the desired alkylatedheterocyclic product in good to excellent yields.
在这里,我们报告了使用原料羧酸作为自由基前体通过光诱导 LMCT 对 quinoxalin-2(1 H )-ones进行铈介导的脱羧烷基化。这种操作简单的协议克服了直接使用羧酸获得烷基自由基的限制。光谱研究揭示了光诱导的 LMCT 和 CO 2演化事件。我们利用广泛的烷基羧酸(1° 至 3° 酸)、氨基酸和药学上重要的酸作为偶联伙伴,以良好至优异的产率合成所需的烷基化杂环产物。