An efficient and cost-effective procedure for preparation of Fe3O4
nanoparticles and supported Brønsted acidic ionic liquid 1-methyl-3-(3-
trimethoxysilylpropyl)imidazolium hydrogen sulfate (Fe3O4-IL-HSO4) as a Brønsted acidic ionic liquid and efficient magnetic catalyst is described, together with its
use for one-pot synthesis of polysubstituted quinolines through Friedla ¨nder condensation of 2-aminoaryl ketones with 1,3-dicarbonyl compounds under solventfree conditions. The most noteworthy aspects of this methodology are its environmental friendliness, simplicity of operation, excellent yield within short reaction
time, easy product isolation, and excellent reusability potential of the catalyst.
