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。
Cathodically Coupled Electrolysis to Access Biheteroaryls
An electrochemical approach to biheteroaryls through the coupling of diverse N-heteroarenes with heteroaryl phosphonium salts is reported. The reaction features pH and redox-neutral conditions and excellent regioselectivity, as well as exogenous air or moisture tolerance. Additionally, a one-pot, two-step protocol can be established to realize formal C–H/C–H coupling of heteroarenes, thereby greatly
We disclose the synthesis of 3-arylquinoxalin-2-ones from o-phenylenediamines and readily available arylacetates. The method harnesses the selective oxidative property of elemental sulfur in the presence of amine base catalyst and DMSO. The reactions are operationally simple and tolerate a wide range of functional groups.