Visible-light induced decarboxylative alkylation of quinoxalin-2(1<i>H</i>)-ones at the C3-position
作者:Wenxuan Xue、Yingpeng Su、Ke-Hu Wang、Rong Zhang、Yawei Feng、Lindan Cao、Dangfeng Huang、Yulai Hu
DOI:10.1039/c9ob01169b
日期:——
simple and efficient method for the visible light induced direct carbon alkylation of quinoxalin-2(1H)-ones at the C3 position is described. This protocol employs cheap and readily available phenyliodine(III) dicarboxylates as the alkylation reagents to conduct decarboxylative radical coupling reaction with quinoxalin-2(1H)-ones. The process exhibits excellent compatibility to functional groups and
Metal‐Free Multi‐Component Sulfur Dioxide Insertion Reaction Leading to Quinoxalin‐2‐One‐Containing Vinyl Sulfones under Visible‐Light Photoredox Catalysis
A metal-free multi-component sulfur dioxide insertionreaction of alkynes, sodium metabisulfite, aryldiazonium, and quinoxalin-2-ones has been developed under visible-light photoredox-catalysis. This photocatalytic tandem reaction would be conducted at room temperature by using of Rhodamine 6G as organic photocatalyst and sodium metabisulfite as the SO2 surrogate. This protocol provides a synthetic
在可见光光氧化还原催化下开发了炔烃、焦亚硫酸钠、芳基重氮和喹喔啉-2-酮的无金属多组分二氧化硫插入反应。该光催化串联反应将在室温下通过使用罗丹明 6G 作为有机光催化剂和焦亚硫酸钠作为 SO 2替代物进行。该协议为构建具有良好官能团耐受性的各种含喹喔啉-2-one 的乙烯基砜提供了一种合成策略,其中一个 C-C 键和两个 C-S 键是在一锅程序中构建的。
Visible-light induced C3-H trifluoromethylation of quinoxalin-2(1H)-ones with CF3SO2Cl under external photocatalyst-free conditions
作者:Xia Mi、Beibei Cui、Jingyu Zhang、Chao Pi、Xiuling Cui
DOI:10.1016/j.tetlet.2022.153693
日期:2022.3
light-induced C-H trifluoromethylation of quinoxalin-2(1H)-ones with CF3SO2Cl as CF3 radical source under photocatalyst-free conditions. The reaction proceeds smoothly through a radical process in the absence of photocatalyst and oxidant in moderate to good yields, thus offering an efficient and green method for the synthesis of 3-trifluoromethyl quinoxalin-2(1H)-ones.
本文报道了在无光催化剂条件下,以 CF 3 SO 2 Cl 作为 CF 3自由基源的 quinoxalin-2(1 H )-ones的可见光诱导 CH 三氟甲基化。该反应在没有光催化剂和氧化剂的情况下以中等至良好的收率通过自由基过程顺利进行,从而为合成3-三氟甲基喹喔啉-2( 1H )-酮提供了一种高效、绿色的方法。
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