Studies on quinoline and isoquinoline derivatives. VIII. Hydration and hydrogenation of ethynyl substituents attached to the pyridine moiety of quinoline and isoquinoline rings.
Visible-Light-Mediated Direct Decarboxylative Acylation of Electron-Deficient Heteroarenes Using α-Ketoacids
作者:Sabyasachi Manna、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.joc.9b00004
日期:2019.5.3
Acylation of electron-deficient heteroaromatic compounds has been developed using visible light. α-Ketoacids have been used as an efficient source of acyl radicals under photoredox conditions. The in situ generated acyl radicals from α-ketoacids have been coupled to a wide variety of electron-deficient heteroaromatic compounds in a Minisci type reaction. This method would be attractive to access biologically
General Copper-Catalyzed Coupling of Alkyl-, Aryl-, and Alkynylaluminum Reagents with Organohalides
作者:Bijay Shrestha、Surendra Thapa、Santosh K. Gurung、Ryan A. S. Pike、Ramesh Giri
DOI:10.1021/acs.joc.5b02077
日期:2016.2.5
We report the first example of a very general Cu-catalyzed cross-coupling of organoaluminum reagents with organohalides. The reactions proceed for the couplings of alkyl-, aryl-, and alkynylaluminum reagents with aryl and heteroarylhalides and vinyl bromides, affording the cross-coupled products in good to excellent yields. Both primary and secondary alkylaluminum reagents can be utilized as organometallic
Synthesis and electrogenerated chemiluminescence of donor-substituted phenylquinolinylethynes and phenylisoquinolinylethynes: effect of positional isomerismElectronic supplementary information (ESI) available: synthetic procedures, measurement details and characterization data of all compounds. See http://www.rsc.org/suppdata/ob/b4/b403775h/
作者:Arumugasamy Elangovan、Shu-Wen Yang、Jui-Hsien Lin、Kuo-Ming Kao、Tong-Ing Ho
DOI:10.1039/b403775h
日期:——
In furtherance of our research on the design, synthesis and study of electrogenerated chemiluminescence (ECL) of new donor substituted phenylquinolinylethynes, we report here more new series with the aim of studying the effect of positional isomerism on their overall photophysical properties with a special focus on ECL. For this study we have chosen 2-, 3-, and 4-(p-substituted phenyl)ethynylquinolines, and 1- and 4-(p-substituted phenyl)ethynylisoquinolines. These ethynes were synthesized in good yields by modified Sonogashira coupling of the corresponding terminal alkyne with the respective haloquinolines. The photophysical properties and ECL were studied in acetonitrile solvent and the various results are discussed.
sequence based on two‐fold quaternization followed by the key intramolecular [2+2+2] alkyne cycloaddition. The physico‐chemical properties of four new linquats were characterized by spectroscopic methods, X‐ray crystallography, and electrochemistry complemented by information obtained from DFT calculations. Electron deficient N‐heteroaromatic cations with linear extended diquat motif with high electron
Organocatalytic functionalization of heteroaromatic N-oxides was investigated using in situ generated onium amide bases, and C-nucleophiles were efficiently introduced by the sequential addition–elimination reaction under metal-free conditions, affording 2-substituted nitrogen heteroaromatics generally in good to high yields.