Cu(ii) immobilized on Fe₃O₄@HNTs–tetrazole (CFHT) nanocomposite: synthesis, characterization, investigation of its catalytic role for the 1,3 dipolar cycloaddition reaction, and antibacterial activity

Abstract

In the present study, Cu(ii) immobilized on an Fe3O4@HNTs–tetrazole (CFHT) nanocomposite was designed and prepared.

Guanidinylated SBA-15/Fe3O4 mesoporous nanocomposite as an efficient catalyst for the synthesis of pyranopyrazole derivatives

“…10 . As reported in the previous studies 22 , 47 , several main steps give the final product. First, the carbonyl groups of ethyl acetoacetate are activated by both amine group through hydrogen bonding and the Lewis acid site in the guanidinylated SBA-15/Fe 3 O 4 catalyst and then subjected to the nucleophilic attack of hydrazine hydrate with two nucleophilic sites.…”

A sustainable gateway to access 1,8-dioxo-octahydroxanthene scaffoldsviaa surface-engineered halloysite-based magnetically responsive catalyst

“…The synthetic procedure for the fabrication of functionalized MHNTs was carried out in a round-bottom flask containing 50 mL of dried toluene to which 1.5 g of MHNTs was added. 57 For the uniform dispersion of MHNTs in the solvent, the above suspension was ultrasonicated for 20 min at room temperature. Following the addition of 5 mL CPTMS solution, the above reaction mixture was placed in oil bath and refluxed for 24 h at 110 °C under a nitrogen atmosphere after being sealed with a condenser and rubber septum.…”

Magnetized melamine‐modified polyacrylonitrile (PAN@melamine/Fe3O4) organometallic nanomaterial: Preparation, characterization, and application as a multifunctional catalyst in the synthesis of bioactive dihydropyrano [2,3‐c]pyrazole and 2‐amino‐3‐cyano 4H‐pyran derivatives

“…[17][18][19][20] Multicomponent reactions (MCRs) are significant methods to synthesize diverse complex heterocyclic compounds. [4,[21][22][23][24][25][26][27] They have received great attention because of striking advantages including simplicity, cost-effectiveness, atomic economy, energy and time savings, mild reaction conditions, and high selectivity. [28][29][30] 4H-pyran derivatives exhibited various medicinal properties such as antispasmodic, anticoagulant, antiallergic, antimicrobial, antidepressant, antifungal, hypoglycemic, anti-HIV, and antipyretic activities [31][32][33][34][35] and also a therapeutic activity for neurological diseases for instance Alzheimer's and Parkinson's, [36] therefore different methods and catalysts have been reported for the synthesis of this oxygen-containing heterocycle such as ionic liquids, [37] L-proline, [38] Polyethylene glycol (PEG), [39] Al 2 O 3 /V 2 O 5 , [32] poly (py-co-ani)@Go-Fe 3 O 4 , [33] ZnFe 2 O 4 @dimethylglyoxime, [40] zinc-based metalorganic framework, [41] ninhydrin, [42] and ZnS/CuFe 2 O 4 / agar.…”