Journal
TETRAHEDRON LETTERS
Volume 54, Issue 35, Pages 4633-4636Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2013.06.050
Keywords
4-Hydroxy-2-quinolone; Ionic liquid; Meldrum's acid; Reusable catalyst; Multicomponent reaction
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Funding
- Research Council of the University of Guilan
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The synthesis of novel 4-substituted-3,4-dihydro-6H-pyrano[3,2-c]quinoline-2,5-diones was accomplished efficiently via a three-component reaction between 4-hydroxyquinoline-2-one, Meldrum's acid, and an alkyl or arylaldehyde under catalysis by [Bmim]HSO4. The ionic liquid catalyst offers the advantage of realizing the synthesis of the title products at ambient temperature and widens the scope of the reactants to include aliphatic aldehydes with respect to the catalysts already applied for similar syntheses. (C) 2013 Elsevier Ltd. All rights reserved.
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