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。
Iodine-Catalyzed C–N Bond Formation: Synthesis of 3-Aminoquinoxalinones under Ambient Conditions
cross-dehydrogenative coupling between quinoxalinones (sp2 C–H) and amines (N–H) in the presence of catalytic iodine is reported. The reaction yields 3-aminoquinoxalinones in moderate to high yields under ambient conditions in dioxane as solvent and aqueous tert-butyl hydroperoxide (TBHP) as the terminal oxidant. The reaction is highly versatile and exhibits good functional group tolerance with a range of primary
Herein the first example of electrochemically enabled, NiCl2-catalyzed reductive decarboxylative coupling of N-hydroxyphthalimide (NHP) esters with quinoxalinones is reported. A range of primary, secondary, tertiary aliphatic carboxylic acids and amino acid-derived esters were tolerated well. This decarboxylative coupling allows access to structurally diverse 3-alkylated quinoxalinones in up to 91%
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.