Sulfuric acid-modified PEG-6000 (PEG-OSO3H): an efficient, bio-degradable and reusable polymeric catalyst for the solvent-free synthesis of poly-substituted quinolines under microwave irradiation
acid-modified polyethylene glycol 6000 (PEG-OSO3H) is applied as an efficient and eco-friendly polymeric catalyst for Friedländer synthesis of poly-substituted quinolines from 2-aminoaryl ketones (or anthranilonitrile) and carbonyl compounds possessing a reactive methylene group undermicrowaveirradiation and solvent-free conditions. The reactions are completed in short times, and the products are obtained
Sulfamic acid supported on Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>superpara magnetic nanoparticles as a recyclable heterogeneous catalyst for the synthesis of quinolines
作者:M. A. Nasseri、B. Zakerinasab、M. M. Samieadel
DOI:10.1039/c4ra06699e
日期:——
In the present study, for the first time the synthesis of sulfamic acid supported on Fe3O4@SiO2 superpara magnetic nanoparticles as a solid acid catalyst with large density of sulfamic acid groups was suggested. The structural and magnetic properties of functionalized Fe3O4@SiO2 nanoparticles are identified by TEM, IR, VSM, XRD, TGA and elemental analysis. Then, the applicability of the synthesized nanoparticles was tested as a recyclable acidic catalyst for the synthesis of quinoline derivatives, an important class of potentially bioactive compounds. The products are obtained in good to high yields (72–98%) from one-pot reaction procedure involving carbonyl compounds and 2-amino benzophenone under solvent-free conditions.
has been shown that acid catalysis is more effective than base catalysts for the Friedlander annulation. In recent years, Bronsted and Lewis acids such as ionicliquids, sulfamic acid, hydrochloric acid, zirconium tetrakisdodecyl sulfate [Zr(DS)4], 29 silica sulfuric acid, silica supported phosphomolybdic acid [PMA.SiO2], 32 nanocrystalline aluminium oxide, dodecylphosphonic acid (DPA), poly(N-bromoethylbenzene-1
Bi(OTf)<sub>3</sub>-Catalyzed Friedländer Hetero-Annulation: A Rapid Synthesis of 2,3,4-Trisubstituted Quinolines
作者:J. S. Yadav、B. V. Reddy、K. Premalatha
DOI:10.1055/s-2004-822898
日期:——
Polysubstituted quinolines are readily prepared in high yields under extremely mild conditions through a sequential condensation/annulation reaction of 2-aminoaryl ketones and α-methylene ketones using a catalytic amount of bismuth triflate.
Efficient and Rapid Friedlander Synthesis of Functionalized Quinolines Catalyzed by Neodymium(III) Nitrate Hexahydrate
作者:Srinivas Adapa、Ravi Varala、Ramu Enugala
DOI:10.1055/s-2006-950296
日期:2006.11
Friedlander synthesis of quinolines catalyzed by neodymium nitrate [Nd(NO 3 ) 3 ·6H 2 O, 5 mol%] in ethanol at room temperature was achieved in moderate to excellent yields (62-94%).