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 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
Green and efficient C–C bond cleavage/cyanoalkylation of quinoxalin-2(1H)-ones and other heteroarenes under visible light or sunlight irradiation is described. The reaction proceeds under mild conditions at room temperature without transition-metal catalysts and extra bases. Notably, the products enable facile transformations to various significant organic compounds.
<i>O</i>-Perfluoropyridin-4-yl Oximes: Iminyl Radical Precursors for Photo- or Thermal-Induced N–O Cleavage in C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Bond Formation
作者:Peng-Ju Xia、Yuan-Zhuo Hu、Zhi-Peng Ye、Xu-Jie Li、Hao-Yue Xiang、Hua Yang
DOI:10.1021/acs.joc.9b03251
日期:2020.3.6
group was first installed onto cycloketone oximes as a new electrophore, which was proven to be efficient iminyl radicalprecursors under photocatalytic and thermal conditions. A range of O-perfluoropyridin-4-yl oximes were successfully utilized in C(sp2)-C(sp3) bond formations of quinoxalin-2(1H)-ones and alkenes, providing facile accesses to a range of functionalized alkylnitriles.