Diazabicyclo[2.2.2]octane stabilized on Fe3O4 as catalysts for synthesis of coumarin under solvent-free conditions

Abstract

Fe 3 O 4 -diazabicyclo[2.2.2]octane (Fe 3 O 4 -DAB-CO) magnetic nanoparticles (MNPs) catalyst was readily prepared from inexpensive starting materials in aqueous media which catalyzed the synthesis of coumarin. FTIR spectroscopy, X-ray diffraction, transmission electron micrographs were employed to characterize the properties of the synthesized Fe 3 O 4 -DABCO MNPs. High catalytic activity and ease of recovery from the reaction mixture using external magnet, and several reuse times without significant losses in performance are additional ecofriendly attributes of this catalytic system.

A green biosynthesis of NiO nanoparticles using aqueous extract of Tamarix serotina and their characterization and application

“…Structural assignments of the products are based on their 1 H NMR, 13 C NMR, mass and IR spectra. [35] 3 PMA-SiO 2 EtOH, reflux, 8 h 88 [36] 4 Zr(DS) 4 H 2 O, reflux, 6 h 90 [37] 5 Zr(HSO 4 ) 4 H 2 O, reflux, 13 h 87 [38] 6 CH 3 COOH (1 eq.) H 2 O, 60°C, 6 h 60 [39] 7 p-TsOH (1 eq.)…”

“…In continuation of our work on the synthesis of efficient and nontoxic nanocatalysts and their application in syntheses of biologically important compounds, [32][33][34][35][36][37][38] in the work reported here, we synthesized nickel oxide nanoparticles using aqueous extract of Tamarix serotina and evaluated their catalytic activity in the preparation of quinoline derivatives. Quinolines were produced in good to high yields (60-90%) by treatment of 2-aminobenzophenone with various carbonyl compounds (Scheme 1).…”

Dabco containing acidic poly(ionic liquid): An efficient catalyst for the one-pot Preparation of 2,3-dihydroquinazoline-4(1H)-ones

“…Due to the diverse biological activities [12], synthesis of quinazolinone derivatives is a demanding task. Numerous synthetic methods have been developed for the synthesis of quinazolinone derivatives using silica sulfuric acid [13], gallium(III) triflate [12], MCM-41-SO 3 H [15], 1-butyl-3-methylimidazolium tetrafluoroborate [16], molecular iodine [17], β-cyclodextrin [18], and metal-MWCNTs nanocomposites [19,20]. Most of these methods suffer from one or more of these disadvantages, such as the use of hazardous organic solvents, low yields, strongly acidic conditions, expensive moisture-sensitive catalysts, and tedious work-up procedure [21].…”

Application of Fe3O4@SiO2@sulfamic acid magnetic nanoparticles as recyclable heterogeneous catalyst for the synthesis of imine and pyrazole derivatives in aqueous medium

“…In continuation of our work on the synthesis of efficient and nontoxic nanocatalysts and their application in the synthesis of biologically important compounds [47][48][49][50][51][52], in this work, we used Fe 3 O 4 @SiO 2 @sulfamic acid as a nanometer-scale, magnetic, supported, acidic catalyst for the synthesis of pyrazoles by the condensation of dicarbonyl compounds and hydrazines/hydrazides. Pyrazole and imine derivatives were produced with good to high yields (78-98 %) in aqueous medium (Scheme 1).…”