Metal-free visible-light-initiated direct C3 alkylation of quinoxalin-2(1<i>H</i>)-ones and coumarins with unactivated alkyl iodides
作者:Jun Sun、Hua Yang、Bo Zhang
DOI:10.1039/d1gc03992j
日期:——
visible-light-promoted direct C3 alkylation of quinoxalin-2(1H)-ones and coumarinsusing readily accessible unactivated alkyl iodides as alkylation reagents. By applying this new approach, a broad range of valuable 3-alkylated quinoxalin-2(1H)-ones and coumarins (55 examples) can be facilely obtained at room temperature, thus showing the wide utility of this protocol. Notably, this practical reaction occurs under
我们首次报告了使用容易获得的未活化烷基碘作为烷基化试剂对喹喔啉-2(1 H )-酮和香豆素进行可见光促进的直接 C3 烷基化。通过应用这种新方法,可以在室温下轻松获得各种有价值的 3-烷基化 quinoxalin-2(1 H )-ones 和香豆素 (55 个例子),从而显示了该协议的广泛实用性。值得注意的是,这种实际反应发生在无金属和无外部光催化剂的条件下,表现出广泛的底物范围和高官能团耐受性。
A combination of heterogeneous catalysis and photocatalysis for the olefination of quinoxalin-2(1<i>H</i>)-ones with ketones in water: a green and efficient route to (<i>Z</i>)-enaminones
features very mild conditions using a simple and cheap catalyst for the synthesis of (Z)-enaminones with moderate-to-good yields. Such a methodology successfully combines the heterogeneous Mannich reaction with photocatalysis, and provides a green and practical approach for the synthesis of potentially bioactive (Z)-enaminones with a 3,4-dihydroquinoxalin-2(1H)-one skeleton.
commercially available and cheap carboxylicacids as alkylating reagents, a practical methodology for the visible-light induced decarboxylative alkylation of quinoxalin-2(1H)-ones was developed. The reaction proceeds in the absence of metal-catalyst, acid or basic additive, or external photosensitizer, making it an environmentally friendly and attractive protocol for the alkylation of quinoxalines.
使用市售廉价的羧酸作为烷基化试剂,开发了一种实用的方法,用于可见光诱导的 quinoxalin-2(1 H )-ones 的脱羧烷基化。该反应在没有金属催化剂、酸或碱添加剂或外部光敏剂的情况下进行,使其成为一种环境友好且有吸引力的喹喔啉烷基化方案。
Molecular oxygen-mediated selective hydroxyalkylation and alkylation of quinoxalin-2(1H)-ones with alkylboronic acids
作者:Hongdou Zhang、Jun Xu、Yani Ouyang、Xiaoguang Yue、Chenxin Zhou、Zhigang Ni、Wanmei Li
DOI:10.1016/j.cclet.2021.09.069
日期:2022.4
oxygen-mediated method for the selective hydroxyalkylation and alkylation of quinoxalin-2(1H)-ones with alkylboronic acids under transition-metal free conditions has been developed. This strategy demonstrates a broad scope of quinoxalin-2(1H)-ones and alkylboronic acids, giving 3-hydroxyalkylquinoxalin-2(1H)-ones and 3-alkylquinoxalin-2(1H)-ones in moderate-to-good yield. Control experiments reveal that
在此,开发了一种有效的分子氧介导的方法,用于在无过渡金属条件下用烷基硼酸选择性羟烷基化和烷基化 quinoxalin-2(1 H )-ones。该策略展示了广泛的 quinoxalin-2(1 H )-ones 和烷基硼酸,使 3-hydroxyalkylquinoxalin-2(1 H )-ones 和 3-alkylquinoxalin-2(1 H )-ones 处于中等至良好的屈服。对照实验表明涉及一种激进的途径。