Visible-light-induced C H arylation of quinoxalin-2(1H)-ones in H2O
作者:Hanyang Bao、Ziyun Lin、Mengshi Jin、Hongdou Zhang、Jun Xu、Bajin Chen、Wanmei Li
DOI:10.1016/j.tetlet.2021.152841
日期:2021.3
An efficient visible-light-induced CH arylation of quinoxalin-2(1H)-ones in H2O is developed, which has the advantages of mild reaction conditions, environmental friendliness and good functional group tolerance. This strategy provides a simple operation method to access various 3-aryl quinoxalin-2(1H)-ones in moderate to good yields.
Two facile and effective C-3 arylation protocols of quinoxalin-2(1H)-ones with arylhydrazines and aryl boronic acids respectively via free radical cross-coupling reactions under metal-, photocatalyst- and light-free conditions have been unveiled. K2S2O8 has been used as an efficient oxidant to generate aryl radicals from arylhydrazines and aryl boronic acids under two different reaction conditions
已经揭示了喹喔啉-2( 1H )-酮分别与芳基肼和芳基硼酸通过自由基交叉偶联反应在金属、光催化剂和无光条件下进行的两种简便有效的C-3芳基化方案。 K 2 S 2 O 8已被用作有效的氧化剂,在两种不同的反应条件下由芳基肼和芳基硼酸生成芳基自由基。生成的芳基自由基在喹喔啉-2(1 H )-酮的C-3位发生自由基偶联反应,以良好至优异的产率产生3-芳基喹喔啉-2(1 H )-酮。 2,2,6,6-四甲基哌啶-1-氧基自由基捕获实验已证明自由基参与反应过程。
Aryl acyl peroxides for visible-light induced decarboxylative arylation of quinoxalin-2(1<i>H</i>)-ones under additive-, metal catalyst-, and external photosensitizer-free and ambient conditions
作者:Long-Yong Xie、Sha Peng、Li-Hua Yang、Cun Peng、Ying-Wu Lin、Xianyong Yu、Zhong Cao、Yu-Yu Peng、Wei-Min He
DOI:10.1039/d0gc02844d
日期:——
Aryl radicals were generated for the first time from cheap and easily available aryl acyl peroxides in eco-friendly ethyl acetate underambientconditions and visible-light illumination in the absence of any additive, metal catalyst, or external photosensitizer. The present arylation of quinoxalin-2(1H)-ones was chemo- and regioselective, and provided good access to various 3-arylquinoxalin-2(1H)-ones
Direct C-H arylation of quinoxalinones with aryl acylperoxides under catalyst-free condition
作者:Bajin Chen、Shengpeng Wang、Jinxing Song、Xiaojun Wang、Bencheng Yu、Xiaobo Yang
DOI:10.1016/j.tetlet.2020.152681
日期:2021.1
A simple and novel method for the direct C-H arylation of quinoxalinones with aryl acylperoxides has been developed. This reaction proceeded smoothly through a radicalprocess under catalyst-free condition, giving the target products in moderate good yields. Such strategy provides a simple and green alternative for the synthesis of 3-arylquinoxalinones.