Metal Free Benzylation and Alkylation of Quinoxalin‐2(1
<i>H</i>
)‐ones with Alkenes Triggered by Sulfonyl Radical Generated from Sulfinic Acids
作者:Himangsu Sekhar Dutta、Ashfaq Ahmad、Afsar Ali Khan、Mohit Kumar、Raziullah、Dipankar Koley
DOI:10.1002/adsc.201901212
日期:2019.12.17
A metal‐free domino multicomponent reaction for the direct C−H benzylation and alkylation of quinoxalin‐2(1H)‐ones using alkenes is described. Triggered by the sulfonyl radical generated from sulfinic acid, the alkenes are transformed to alkyl radicals that react exclusively at the C‐3 position of quinoxalin‐2(1H)‐ones. Importantly, the method not only functionalizes medicinally important quinoxalin‐2(1H)‐one
C(sp2)–H/O–H cross-dehydrogenative coupling of quinoxalin-2(1H)-ones with alcohols under visible-light photoredox catalysis
作者:Long-Yong Xie、Yi-Shu Liu、Hong-Ru Ding、Shao-Feng Gong、Jia-Xi Tan、Jun-Yi He、Zhong Cao、Wei-Min He
DOI:10.1016/s1872-2067(19)63526-6
日期:2020.8
Abstract An efficient and practical route to various 3-alkoxylquinoxalin-2(1H)-ones through visible-light photocatalytic C(sp2)−H/O−H cross-dehydrogenation coupling of quinoxalin-2(1H)-ones and alcohols, employing ambient air as an oxidant at roomtemperature under metal-free conditions, was developed.
commercially available and cheap carboxylicacids as alkylating reagents, a practical methodology for the visible-light induced decarboxylative alkylation of quinoxalin-2(1H)-ones was developed. The reaction proceeds in the absence of metal-catalyst, acid or basic additive, or external photosensitizer, making it an environmentally friendly and attractive protocol for the alkylation of quinoxalines.
使用市售廉价的羧酸作为烷基化试剂,开发了一种实用的方法,用于可见光诱导的 quinoxalin-2(1 H )-ones 的脱羧烷基化。该反应在没有金属催化剂、酸或碱添加剂或外部光敏剂的情况下进行,使其成为一种环境友好且有吸引力的喹喔啉烷基化方案。
Diastereoselective [3 + 2] Cycloaddition of Quinoxalin-2(1<i>H</i>)-ones with Donor–Acceptor Cyclopropanes: Efficient Synthesis of Tetrahydro pyrrolo[1,2-<i>a</i>]quinoxalin-4(5<i>H</i>)-ones
heterocycles like benzoxazinone, isoquinoxalinone, and dibenzoxazepine derivatives were also suitable for the desired annulation reaction. The current method is applicable for the scale-up reaction. Further, the utility of this annulation reaction is demonstrated by the synthesis of densely functionalized proline derivatives.
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。