Direct <i>para</i>-C–H heteroarylation of anilines with quinoxalinones by metal-free cross-dehydrogenative coupling under an aerobic atmosphere
作者:Jun Xu、Lin Huang、Lei He、Chenfeng Liang、Yani Ouyang、Jiabin Shen、Min Jiang、Wanmei Li
DOI:10.1039/d1gc01899j
日期:——
Herein, a green and efficient metal-free cross-dehydrogenative coupling (CDC) for the direct para-C–H heteroarylation of anilines with quinoxalinones has been described. This reaction is performed in H2O/DMSO (v/v = 2 : 1) usingair as the soleoxidant. Various anilines (primary, secondary and tertiary amines) and quinoxalinones are well compatible, affording the corresponding products in moderate-to-good
本文描述了一种绿色且高效的无金属交叉脱氢偶联(CDC),用于苯胺与喹喔啉酮的直接对-C-H 杂芳基化。该反应在 H 2 O/DMSO (v/v = 2:1) 中进行,使用空气作为唯一氧化剂。各种苯胺(伯胺、仲胺和叔胺)和喹喔啉酮具有良好的相容性,以中等至良好的产率提供相应的产品。这种方法为含氮化合物的后期改性提供了一种环境友好且有效的替代方法。
A combination of heterogeneous catalysis and photocatalysis for the olefination of quinoxalin-2(1<i>H</i>)-ones with ketones in water: a green and efficient route to (<i>Z</i>)-enaminones
features very mild conditions using a simple and cheap catalyst for the synthesis of (Z)-enaminones with moderate-to-good yields. Such a methodology successfully combines the heterogeneous Mannich reaction with photocatalysis, and provides a green and practical approach for the synthesis of potentially bioactive (Z)-enaminones with a 3,4-dihydroquinoxalin-2(1H)-one skeleton.
α-Functionalization of ketones promoted by sunlight and heterogeneous catalysis in the aqueous phase
作者:Lei He、Chenfeng Liang、Yani Ouyang、Lin Li、Yirui Guo、Pengfei Zhang、Wanmei Li
DOI:10.1039/d1ob02249k
日期:——
Herein, a protocol that combines heterogeneous catalysis and solar photocatalysis for the regioselective α-substitution of asymmetricketones with quinoxalinones has been reported. The result indicates that the reaction is more likely to occur on the α-carbon. This strategy provides a green and efficient way for the α-functionalization of ketones. A singlet oxygen involved mechanism is suggested for
Palladium-catalyzed oxidative amidation of quinoxalin-2(1<i>H</i>)-ones with acetonitrile: a highly efficient strategy toward 3-amidated quinoxalin-2(1<i>H</i>)-ones
palladium-catalyzed direct oxidative amidation of quinoxalin-2(1H)-ones with acetonitrile was developed to synthesize 3-amidated quinoxalin-2(1H)-ones. A series of 3-acetamino quinoxalin-2(1H)-one derivatives were constructed with good to excellent yields. This methodology provided a practical approach to various 3-acetamino quinoxalin-2(1H)-ones from the readily available starting material acetonitrile
C3-trifluoroethylation of quinoxalin-2-(1H)-ones has been developed using an inexpensive organic dye as a photocatalyst and commercially available 1,1,1-trifluoro-2-iodoethane as a trifluoroethyl radical source. This reaction has a wide range of applicability and mild reaction conditions, which provide a straightforward route in preparation of C3-trifluoroethylated quinoxalin-2-(1H)-ones.
使用廉价的有机染料作为光催化剂和市售的 1,1,1-三氟-2-碘乙烷作为三氟乙基自由基源,开发了可见光诱导的喹喔啉-2- (1 H )-酮的 C3-三氟乙基化. 该反应具有广泛的适用性和温和的反应条件,为制备C3-三氟乙基化喹喔啉-2-(1 H )-酮提供了一条简单的途径。