In this paper, we introduce two nonconventional ionic liquid compounds which are composed of propane
sulfonate functionalized organic cations and heteropolyanions as green solid acid catalysts for the highly efficient and
green synthesis of 2,3-disubstitutedquinoxaline derivatives. These ionic liquids are in the solid state at room temperature
and the synthesis is carried out via the one-pot condensation reaction of various o-phenylenediamine with 1,2-diketone
derivatives. Benzoxazole and benzimidazole derivatives were also synthesized by these novel catalysts via the one-pot
condensation from reaction orthoester with o-aminophenol (synthesis of benzoxazole derivatives) and ophenylenediamine
(synthesis of benzimidazole derivatives). All experiments successfully resulted in the desired products.
The described novel synthesis method has several advantages of safety, mild condition, high yields, short reaction times,
simplicity and easy workup compared to the traditional method of synthesis.
Keywords: 2, 3-Disubstitutedquinoxaline, benzimidazole, benzoxazole, green solid acid catalyst, ionic liquid, water solvent.
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