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.
Direct C3−H amination of quinoxalin‐2(1H)‐ones with azoles has been achieved in a very fast manner. This protocol features broad substrate scope, good yields, and mild reaction conditions.
A highly efficient, transition metal- and oxidant-free, direct C(sp2)-H difluoromethylation of heterocyclesthrough visible light-induced electrontransfer was developed. The reaction afforded difluoromethyl heterocycles by only using photoexcited diacetyl. The reaction showed a broad substrate tolerance and gave the products in good yields. Moreover, the representative products exhibited potential
Photo-Induced Cross-Dehydrogenative Alkylation of Heteroarenes with Alkanes under Aerobic Conditions
作者:Jun Xu、Heng Cai、Jiabin Shen、Chao Shen、Jie Wu、Pengfei Zhang、Xiaogang Liu
DOI:10.1021/acs.joc.1c02125
日期:2021.12.17
We report a Minisci-type cross-dehydrogenative alkylation in an aerobic atmosphere using abundant and inexpensive cerium chloride as a photocatalyst and air as an oxidant. This photoreaction exhibits excellent tolerance to functional groups and is suitable for both heteroarene and alkane substrates under mild conditions, generating the corresponding products in moderate-to-good yields. Our method provides