Abstract
We present a facile and environmentally benign protocol for synthesis of variously substituted imidazole derivatives via multicomponent condensation of benzil, primary aromatic amine, substituted 1,3-diphenyl-1H-pyrazole-4-carbaldehyde, and ammonium acetate in presence of 1-butyl-3-methyl-1-imidazolium tetrafluoroborate [BMIM][BF4] as catalyst under conventional reflux as well as microwave irradiation condition. The one-pot synthesis, facile solvent-free condition, and good isolated yield illustrate the utility of this green approach. The structural features are derived using analytical tools including fourier transform infrared (FTIR), Liquid chromatography-mass spectrometry (LCMS), and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy.
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