Article

Research on Chemical Intermediates

, Volume 39, Issue 8, pp 3877-3885

Mild preparation of chromeno[2,3-d]pyrimidines catalyzed by Brønsted acidic ionic liquids under solvent-free and ambient conditions

  • Hamid Reza ShaterianAffiliated withDepartment of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan Email author 
  • , Morteza AghakhanizadehAffiliated withDepartment of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan

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Abstract

Brønsted acidic ionic liquids, namely 2-pyrrolidonium hydrogensulfate, N-methyl-2-pyrrolidonium hydrogensulfate, N-methyl-2-pyrrolidonium dihydrogenphosphate, (4-sulfobutyl)tris(4-sulfophenyl)phosphonium hydrogensulfate, triphenyl(propyl-3-sulfonyl)phosphonium toluenesulfonate, l-prolinium sulfate, and l-prolinium nitrate, catalyzed efficient one-pot pseudo-four-component reaction of salicylaldehydes, malononitrile, and secondary amine for preparation of chromeno[2,3-d]pyrimidines under solvent-free conditions at room temperature. The catalysts show environmentally benign character and can be easily prepared, stored, and recovered without obvious significant loss of activity.

Keywords

Ionic liquid Catalyst Solvent free Salicylaldehyde Chromeno[2,3-d]pyrimidine