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K2S2O8 mediated C-3 arylation of quinoxalin-2(1H)-ones under metal-, photocatalyst- and light-free conditions

机译:K2S2O8介导的喹喔啉-2(1H)-2(1H)的C-3芳酸酯,在金属,光催化剂和无可自由条件下

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Two facile and effective C-3 arylation protocols of quinoxalin-2(1 H )-ones with arylhydrazines and aryl boronic acids respectively via free radical cross-coupling reactions under metal-, photocatalyst- and light-free conditions have been unveiled. K _(2) S _(2) O _(8) has been used as an efficient oxidant to generate aryl radicals from arylhydrazines and aryl boronic acids under two different reaction conditions. The generated aryl radicals undergo a free radical coupling reaction at the C-3 position of quinoxalin-2(1 H )-ones producing 3-arylquinoxalin-2(1 H )-ones in good to excellent yields. The involvement of radicals in the course of the reaction has been demonstrated by radical trapping experiments with 2,2,6,6-tetramethylpiperidine-1-oxyl.
机译:在金属 - ,光催化剂和无可自由基条件下,分别通过自由基交联反应和无芳基硼酸和芳基硼酸的两种容易和有效的C-3芳基化方案。 K _(2)S _(2)o _(8)已被用作有效的氧化剂,以在两个不同的反应条件下从芳基肼和芳族硼酸产生芳基。所生成的芳基在喹喔啉-2(1小时)-2(1小时)的C-3位置处经过自由基偶联反应,其产生3-芳基喹啉-2(1 h) - 优异的产率。通过具有2,2,6,6-四甲基哌啶-1-氧基的自由基捕获实验,对反应过程中的基团参与。

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