Preparation and characterization of copper/polysulfonamide complex immobilized on geraphene oxide as a novel catalyst for the synthesis of pyrimido[1,2‐a]benzimidazoles

Abstract

Copper-polysulfonamide complex immobilized on geraphene oxide as a novel heterogeneous catalyst (GO@PSA-Cu) was synthesized and the structure and morphology of catalyst were characterized with various analytical techniques such as Fourier-transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray, N 2 isotherms, elemental mapping, inductively coupled plasma-MS, and thermogravimetric analysis. The GO@PSA-Cu catalyst demonstrated good to excellent yields for the synthesis new derivatives of pyrimido[1,2-a]benzimidazoles via one-pot three-component condensation reaction of various aromatic aldehydes, 2-aminobenzimidazole, and ethyl acetoacetate in ethanol. The method presented herein has several prominent advantages such as cost-effectiveness, operational simplicity, short reaction times, high yields, and reusability of the catalyst even after six consecutive runs.

The preparation, characterization and catalytic activity of Ni NPs supported on porous alginate-g-poly(p-styrene sulfonamide-co-acrylamide)

“…Sulfonamide scaffolds have attracted remarkable attention owing to their potential application in medicinal, 28 and catalytic activity. 29 The results obtained from the catalytic application of sulfonamides indicate that sulfonamides play a vital role in heterogeneous substrates and catalysts. 29 Owing to the biomedical and catalytic application of sulfonamides, p -styrene sulfonamide can be considered as a promising candidate for the synthesis of sodium alginate based catalysts using graft copolymerization.…”

“… 29 The results obtained from the catalytic application of sulfonamides indicate that sulfonamides play a vital role in heterogeneous substrates and catalysts. 29 Owing to the biomedical and catalytic application of sulfonamides, p -styrene sulfonamide can be considered as a promising candidate for the synthesis of sodium alginate based catalysts using graft copolymerization. Similarly, by grafting of PSSA and crosslinking of N , N ′-methylene-bis(acrylamide) with alginate through the nanocasting route a novel type of porous polymer was synthesized.…”

“…Following on from our recent work on the design and application of a multifunctional sulfonamide-based catalyst, 29,32 and the synthesis of functionalized oxadiazole, 29 d in this article, we herein report the green synthesis of 1,3,4-oxadiazoles from the reaction of hydrazides, aryl iodides and tert -butyl isocyanide in the presence of an Alg–PSSA- co -ACA@Ni catalyst ( Scheme 2 ). The prepared porous nanocomposite revealed an excellent catalytic functionality for the synthesis of different 1,3,4-oxadiazoles with high yields.…”

CuI/Fe3O4 NPs@Biimidazole IL‐KCC‐1 as a leach proof nanocatalyst for the synthesis of imidazo[1,2‐a]pyridines in aqueous medium

“…Until now, different copper containing catalysts such as Cu-MOFs, CuSO 4 /glucose, CuCl/Cu (OTf) 2 , CuI/NaHSO 4 -SiO 2 , Cu-MnO, CuI/Cu (OTf) 2 , and CuSO 4 /p-TsOH have been used for the efficient synthesis of imidazo [1,2-a]pyridine. [23][24][25][26][27][28][29] It is important to point out that iron oxide magnetic nanoparticles (MNPs) have been predicted to be a promising immobilization matrix due to its fast electrontransfer kinetics, robust adsorption capacity, high surface-to-volume ratio, biocompatibility, and nontoxic nature. Iron oxide MNPs can be proposed as suitable microenvironment for increment of the organic reactions kinetic based on their catalytically behavior.…”

“…Until now, different copper containing catalysts such as Cu‐MOFs, CuSO 4 /glucose, CuCl/Cu (OTf) 2 , CuI/NaHSO 4 ‐SiO 2 , Cu‐MnO, CuI/Cu (OTf) 2 , and CuSO 4 /p‐TsOH have been used for the efficient synthesis of imidazo[1,2‐ a ]pyridine. [ 23–29 ]…”