Visible-Light-Promoted C2 Selective Arylation of Quinoline and Pyridine <i>N</i>-Oxides with Diaryliodonium Tetrafluoroborate
作者:Dazhi Li、Ce Liang、Zaixing Jiang、Junzheng Zhang、Wang-Tao Zhuo、Fan-Yue Zou、Wan-Peng Wang、Guo-Lin Gao、Jinzhu Song
DOI:10.1021/acs.joc.9b02933
日期:2020.2.21
visible-light-promoted C2 selective arylation of quinoline and pyridineN-oxides, with diaryliodonium tetrafluoroborate as an arylation reagent, using eosin Y as a photocatalyst for the construction of N-heterobiaryls was presented. This methodology provided an efficient way for the synthesis of 2-aryl-substituted quinoline and pyridineN-oxides. This strategy has the following advantages: specific regioselectivity
s with Zn/NH4Cl gave the corresponding quinoline N‐oxides in 80–90% yields. The reaction initiated the reduction of nitro group to afford the corresponding hydroxylamine, which intramolecularly condensed and followed by dehydration to give quinoline N‐oxide. Although treatment of 2‐nitrochalcone with Zn/NH4Cl in EtOH/H2O resulted in the formation of quinoline N‐oxide in low yield, the reaction of 2‐nitrochalcone
Copper-Catalyzed Regioselective Arylation or Alkenylation of Quinoline N-Oxides with Organoboronates
作者:Yaru Niu、He Zhang、Zhongxian Li、Xin Xie、Yuanhong Liu
DOI:10.1021/acs.orglett.4c02583
日期:2024.8.16
A copper-catalyzedarylation or alkenylation of quinoline N-oxides with aryl- or alkenylboronates, respectively, has been developed, which provides an efficient route for C2-substituted oxygenated quinolines under mild reaction conditions. The reaction shows a broad substrate scope for both quinoline N-oxides and aryl/alkenylboronates, mild reaction conditions, and high reaction efficiency. The formation