1,3,5-Trimethylpyrazolium chloride based ionogel as an efficient and reusable heterogeneous catalyst for the synthesis of benzimidazoles

Abstract

A new approach for the synthesis of benzimidazoles using ionogel under solvent-free conditions is reported. Catalytic activity of ionogel was compared with silica coated with ionic liquid (silica-IL) and it was found that ionogel is highly active compared to silica-IL for the synthesis of benzimidazoles. Moreover, ionogel was recyclable for the synthesis of benzimidazoles.

Ionic Liquid-Based Gels for Applications in Electrochemical Energy Storage and Conversion Devices: A Review of Recent Progress and Future Prospects

“…The appropriate choice of electrode materials, IL, and the matrix of the IL-based gel can shed light on developing and exploiting novel smart and sustainable energy storage devices and more geometrically complex electronics. Besides electrochemical device application, another great potential of IL-based gels is to be used in electrochromic devices and as a heterogenous catalyst and biocatalyst [ 16 , 147 , 148 ]. IL-based gels as biocompatible materials were found to be effective in minimizing drug degradation and loss in drug delivery systems [ 16 ].…”

Sodium dichloroiodate promoted C-C bond cleavage: An efficient synthesis of 1,3-Benzazoles via condensation of $${\varvec{o}}$$ o -amino/mercaptan/hydroxyanilines with $${\varvec{\beta }}$$ β -diketones

“…A range of methods are available for synthesis of these heterocycles, including condensation of ophenylenediamine, o-aminophenol, or o-aminobenzenethiol, with aldehydes/carboxylic acids or their equivalents including acid chlorides, amides, nitriles, orthoesters, and β-ketoesters. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] All these methods involve the use of strong oxidative conditions, high temperature, strong proton acids, and/or microwave irradiation for high yields. Another method involves the transition-metal-catalyzed intramolecular cyclization of 2-haloanilides analogues.…”

One-pot synthesis of various 2-amino-4H-chromene derivatives using a highly active supported ionic liquid catalyst

“…[6][7][8][9] Recently, ionic liquids are also used as hybrid materials called ionogels well reviewed by Bideau et al 10 Because of considerable and attractive properties of supported ionic liquid catalysis, earlier also we reported the synthesis of various compounds using these catalysts. [11][12][13][14] Here, we intend to design a catalyst combining the homogeneous nature of ionic liquid and palladium having high activity and selectivity with heterogeneous support to provide large interfacial reaction areas. The supported ionic liquid phase catalysis concept is based on a classical homogeneous catalyst that is dissolved in a thin lm of ionic liquid which is further dispersed over the high internal surface of a porous support.…”