描述了以H 2 O 2作为氧化剂并结合极性溶剂如1,1,1,3,3,3-六氟异丙醇(HFIP)和H 2 O对N-杂环化合物进行氧化脱氢。在这两种溶剂中,杂芳族化合物的最佳收率通常在 HFIP 中实现。然而,值得注意的是,使用无毒溶剂如 H 2 O 得到了如此好的收率。此外,该程序以更大规模实施,HFIP 从反应混合物中蒸馏出来并重复使用(最多 5 个循环),而不会显着损害反应结果。
Effective and Sustainable Access to Quinolines and Acridines: A Heterogeneous Imidazolium Salt Mediates C-C and C-N Bond Formation
作者:Patricia Gisbert、María Albert-Soriano、Isidro M. Pastor
DOI:10.1002/ejoc.201900880
日期:2019.8.15
A robust catalytic system mediates metal‐free and solvent‐free C–C and C–N bond formation by favoring the interaction between the reactants due to the presence of carboxylicacid moieties and chloride counterion, providing a sustainable protocol with appropriate environmental impact.
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
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