Journal
MOLECULES
Volume 11, Issue 10, Pages 731-738Publisher
MDPI
DOI: 10.3390/11100731
Keywords
Biginelli reaction; Hantzsch reaction; multicomponent reactions; 1,4-dihydropyridines; dihydropyrimidinones; solventless reactions
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The catalytic ability of ZrO2/SO42- to promote solventless three-component condensation reactions of a diversity of aromatic aldehydes, urea or thoiurea and ethyl acetoacetate was studied. Products resulting from Hantzsch and/or Biginelli multicomponent reactions are obtained in the presence of solid acid catalysts using the same reactants but different temperature conditions. The sulfated zirconia catalyst can be recovered and recycled in subsequent reactions with a gradual decrease of activity.
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