Chitosan-SO3H is found to catalyze the Friedländer condensation/annulation reaction of 2-aminoaryl ketones with α-methyleneketones to produce the corresponding quinolinederivatives in high yields in short reaction times. The use of recyclable and biodegradable chitosan-SO3H makes this method quite simple, more convenient, and economically viable compared to acid catalyzed methods reported in the literature
Ionic Liquid-Promoted Regiospecific Friedlander Annulation: Novel Synthesis of Quinolines and Fused Polycyclic Quinolines
作者:Sanjay S. Palimkar、Shapi A. Siddiqui、Thomas Daniel、Rajgopal. J. Lahoti、Kumar V. Srinivasan
DOI:10.1021/jo035153u
日期:2003.11.1
Several room-temperature ionic liquids (ILs) based on 1-butylimidazolium salts with varying anions were synthesized and evaluated for the preparation of biologically active substituted quinolines and fused polycyclic quinolines using the Friedlander heteroannulation reaction. On screening, 1-butylimidazolium tetrafluoroborate [Hbim]BF4 was found to be the best ionic liquid for the heteroannulation reaction
Versatile Barium and Calcium Imidazolium-Dicarboxylate Heterogeneous Catalysts in Quinoline Synthesis
作者:María Albert-Soriano、Paz Trillo、Tatiana Soler、Isidro M. Pastor
DOI:10.1002/ejoc.201700990
日期:2017.11.24
A variety of calcium- and barium-based heterogeneous catalysts have been prepared in a straightforward manner from readily available organic linkers and metal sources. The set of materials constitutes a valuable array of catalysts for organic transformations, opening up their practical use.
Homogeneous catalysis, heterogeneous recycling: a new family of branched molecules with hydrocarbon or fluorocarbon chains for the Friedländer synthesis of quinoline under solvent-free conditions
作者:Lei Fang、Jianjun Yu、Ying Liu、Anyin Wang、Limin Wang
DOI:10.1016/j.tet.2013.10.029
日期:2013.12
A new family of branched catalysts with hydrocarbon or fluorocarbon chains was used to catalyze Friedländer reaction between 2-aminoarylketones and α-methylene ketones under solvent-free conditions in good to excellent yields. The catalysts exhibit temperature-dependent solubility and such a thermomorphic character allows them to be recovered by filtration conveniently at room temperature and reused
Rh-Catalyzed C–H Amination/Annulation of Acrylic Acids and Anthranils by Using −COOH as a Deciduous Directing Group: An Access to Diverse Quinolines
作者:Yang Gao、Jianhong Nie、Yibiao Li、Xianwei Li、Qian Chen、Yanping Huo、Xiao-Qiang Hu
DOI:10.1021/acs.orglett.0c00539
日期:2020.4.3
A method for the synthesis of diverse polysubstituted quinolines from readily available acrylic acids and anthranils has been developed. The weakly coordinating –COOH directing group, which can be tracelessly removed in the cascadecyclization, is essential for this reaction. Diverse polysubstituted quinolines were obtained under mild reaction conditions with simple H2O and CO2 as byproducts. More