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。
the synthesis of quinazolinones, quinoxalinones, benzooxazinones, and benzothiazoles from the reactions of α-keto acids with 2-aminobenzamides, benzene-1,2-diamines, 2-aminophenols, and 2-aminobenzenethiols, respectively, is described. The reactions were conducted under catalyst-free conditions, using water as the sole solvent with no additive required, and successfully applied to the synthesis of sildenafil
Visible light-induced direct and highly selective C–H functionalization of quinoxalin-2(1<i>H</i>)-one without orientating group
作者:Huiqing Hou、Changsheng Wang、Xin Cheng、Houzheng Chen、Weiming Sun、Zhiqiang Zheng、Fang Ke
DOI:10.1039/d2cy01640k
日期:——
Using eosin Y and KI as photocatalysts to facilitate the conversion of quinoxaline-2(1H)-one and phenylhydrazine hydrochloride compounds into corresponding 3-arylated quinoxaline-2(1H)-one with high selectivity by a one-pot method under air condition, a simple and efficient synthesis method has been developed. The key feature of this protocol is the C3 arylation of quinoxaline-2(1H)-one, which lacks
以曙红Y和KI为光催化剂促进喹喔啉-2(1 H )-酮和苯肼盐酸盐化合物在空气下通过一锅法高选择性转化为相应的3-芳基化喹喔啉-2(1 H )-酮条件下,开发了一种简单高效的合成方法。该方案的关键特征是喹喔啉-2(1 H )-one 的 C3 芳基化,它缺乏定向基团,通过 Minisci 反应介导的 C-H 功能化具有高 C-H选择性。机理研究表明,KI 与曙红 Y 协同裂解苯肼的 C-N 键,在温和的光激发下促进苯自由基的形成,然后与缺电子的喹喔啉-2(1H )-one通过自由基取代反应,为quinoxalin-2(1 H )-one及其衍生物的直接C-H 3-芳基化提供了一种简单有效的方法。
JPS55167205A
申请人:——
公开号:JPS55167205A
公开(公告)日:1980-12-26
K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> mediated C-3 arylation of quinoxalin-2(1<i>H</i>)-ones under metal-, photocatalyst- and light-free conditions
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。