Journal ArticleDOI
Novel SO3H-Functionalized Ionic Liquids Based on Benzimidazolium Cation: Efficient and Recyclable Catalysts for One-Pot Synthesis of Biscoumarin Derivatives
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TLDR
In this article, a new group of SO3H-functionalized ionic liquids based on benzimidazolium cation was synthesized and used as environmentally benign catalysts for the one-pot synthesis of biscoumarin derivatives.Abstract:
In this article, a new group of SO3H-functionalized ionic liquids based on benzimidazolium cation was synthesized and used as environmentally benign catalysts for the one-pot synthesis of biscoumarin derivatives. The ionic liquids showed high catalytic activities and reusabilities with good to excellent yields of the desired products. H
0 (Hammett function) values and the minimum-energy geometries of SO3H-functionalized ionic liquids were determined and the results revealed that the acidities and catalytic activities of ionic liquids in the synthesis of biscoumarin derivatives were related to their structures. The simple, more efficient way for synthesis of biscoumarin derivatives has been developed. This new method abandon the traditional hazardous organic liquid and is carried out by using a one-pot reaction of 4-hydroxycoumarin with aromatic aldehydes in the presence of novel SO3H-functionalized ionic liquids based on benzimidazolium cation as catalysts. The ionic liquids showed high catalytic activities and reusabilities with good to excellent yields of the desired products. H
0 (Hammett function) values and the minimum-energy geometries of SO3H-functionalized ionic liquids were determined and the results revealed that the acidities and catalytic activities of ionic liquids in the synthesis of biscoumarin derivatives were influenced by their structures.read more
Citations
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Journal ArticleDOI
Synthesis and application of a novel strong and stable supported ionic liquid catalyst with both Lewis and Brønsted acid sites
TL;DR: In this article, a polyvinylpyridine-supported ionic liquid with both Lewis and Bronsted acid sites was easily prepared from its starting materials and used as a novel and highly efficient heterogeneous catalytic system for the synthesis of biscoumarins by two-component one-pot domino Knoevenagel-type condensation/Michael reaction.
Journal ArticleDOI
Sulfated titania catalyzed water mediated efficient synthesis of dicoumarols—a green approach
TL;DR: In this article, an efficient, mild, and environmental friendly method for the synthesis of dicoumarols in water over Lewis and Bronsted acid catalyst sulfated titania (TiO 2 /SO 4 2− ).
Journal ArticleDOI
Crosslinked poly(ionic liquid) as high loaded dual acidic organocatalyst
TL;DR: In this article, a dual acidic heterogeneous organocatalyst was synthesized by copolymerization of acidic ionic liquid monomer (vinyl-3-(3-sulfopropyl) imidazolium hydrogen sulfate [VSim][HSO4]) and ionic fluid crosslinker (1,4-butanediyl- 3,3′-bis-lvinyl imidrazolium dihydrogen sulfate).
Journal ArticleDOI
Choline Hydroxide: An Efficient and Biocompatible Basic Catalyst for the Synthesis of Biscoumarins Under Mild Conditions
TL;DR: Choline hydroxide was found to be a green and efficient catalyst for the synthesis of biscoumarins through the Domino Knoevenagel-Michael reactions under mild conditions as discussed by the authors.
Journal ArticleDOI
Friedel–Crafts alkylation of 4-hydroxycoumarin catalyzed by sulfonic-acid-functionalized pyridinium chloride as a new ionic liquid
TL;DR: In this paper, a green, simple and efficient synthesis of bis-coumarin derivatives via the condensation of 4-hydroxycou marin with arylaldehydes using sulfonic acid-functionalized pyridinium chloride {[Pyridine-SO3H]Cl} as a new, homogeneous and reusable catalyst and ionic liquid is reported.
References
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Journal ArticleDOI
Catalysis in ionic liquids
TL;DR: Hydrogenation of Alkenes and Arenes by Nanoparticles 2624 3.1.2.
Journal ArticleDOI
Chemistry: volatile times for ionic liquids.
TL;DR: At low pressures and moderate temperatures, certain classes of ionic liquids have now been distilled without decomposition, serving as a reminder that a ‘widely held assumption’ does not constitute proof: always obtain experimental verification.
Journal ArticleDOI
Coumarin syntheses via Pechmann condensation in Lewis acidic chloroaluminate ionic liquid
TL;DR: In this article, Butyl-3methylimidazolium chloroaluminate, (bmim)Cl·2AlCl3 ionic liquid is used as an alternative to conventional acid catalysts in the Pechmann condensation of phenols with ethyl acetoacetate leading to the formation of coumarin derivatives.
Journal ArticleDOI
Biscoumarin: new class of urease inhibitors; economical synthesis and activity.
Khalid Mohammed Khan,Sajid Iqbal,Muhammad Arif Lodhi,Ghulam M. Maharvi,Zia Ullah,Muhammad Iqbal Choudhary,Atta-ur Rahman,Shahnaz Perveen +7 more
TL;DR: A variety of biscoumarins (1-21) with variable substituents at C-11 were synthesized with an improved method and evaluated as urease inhibitors, showing varying degree of Urease inhibitory activity.
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