Direct decarboxylative C H 3-arylation of quinoxalin-2(H)-ones with aryl acyl peroxides leading to 3-arylquinoxalin-2(1H)-ones
摘要:
A facile and direct decarboxylative C-H 3-arylation of quinoxalin-2(H)-ones with aryl acyl peroxides has been developed for the synthesis of 3-arylquinoxalin-2(1H)-ones under simple heating conditions. The present methodology provides a simple and highly efficient approach to various 3-arylquinoxalin-2 (1H)-ones in high yields without the use of any catalyst and additives. (C) 2020 Elsevier Ltd. All rights reserved.
Green and efficient C–C bond cleavage/cyanoalkylation of quinoxalin-2(1H)-ones and other heteroarenes under visible light or sunlight irradiation is described. The reaction proceeds under mild conditions at room temperature without transition-metal catalysts and extra bases. Notably, the products enable facile transformations to various significant organic compounds.
Visible‐Light Photoredox Catalyzed C−N Coupling of Quinoxaline‐2(1
<i>H</i>
)‐ones with Azoles without External Photosensitizer
作者:Mingli Sun、Lei Wang、Lulu Zhao、Zhiming Wang、Pinhua Li
DOI:10.1002/cctc.202000459
日期:2020.10.20
A visible‐lightphotoredoxcatalyzedC−Ncoupling of quinoxaline‐2(1H)‐ones with azoles in the absence of externalphotosensitizer has been developed. The protocol employs commercially available pyrazoles and triazoles as amination reagents and shows wide substrate scope, providing the corresponding C3‐position amination products in good yields and high regioselectivity under ambient conditions. Investigations
在没有外部光敏剂的情况下,已经开发了可见光的光氧化还原催化喹喔啉-2(1 H)-one与唑类的C-N偶联。该方案使用了市售的吡唑和三唑作为胺化试剂,并显示了较宽的底物范围,可在环境条件下以高收率和高区域选择性提供相应的C3位胺化产物。研究表明,原料和产物可以用作光敏剂,避免以自催化方式使用其他光催化剂。另外,1 O 2与分子氧中的O 2 .-共存(3 O 2)通过反应过程中的能量转移(ET)和单电子转移(SET)过程。
Electro-oxidative C–H alkylation of quinoxalin-2(1<i>H</i>)-ones with organoboron compounds
作者:Kaikai Niu、Yanke Hao、Lingyun Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d0gc03892j
日期:——
Radical cleavage of C–B bonds to accomplish C–H functionalization is synthetically appealing but practically challenging. We report herein a mild electro-oxidative method for efficient C–H alkylation of quinoxalin-2(1H)-ones by means of radical addition reactions of alkyl boronic acids and esters and alkyl trifluoroborates to afford C–C coupled products.
Metal-Free C(sp<sup>2</sup>)–H/N–H Cross-Dehydrogenative Coupling of Quinoxalinones with Aliphatic Amines under Visible-Light Photoredox Catalysis
作者:Wei Wei、Leilei Wang、Pengli Bao、Yun Shao、Huilan Yue、Daoshan Yang、Xiaobo Yang、Xiaohui Zhao、Hua Wang
DOI:10.1021/acs.orglett.8b03079
日期:2018.11.16
A novel and efficient visible-light-induced C(sp2)–H/N–H cross-dehydrogenative coupling (CDC)-amination with both primary and secondary aliphatic amines at room temperature in air is developed. This photocatalytic reaction allows the direct formation of 3-aminoquinoxalin-2(1H)-ones via CDC-amination in the absence of any external oxidant added from outside. Preliminary mechanistic studies reveal that