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Coumarin Derivatives Solvent-Free Synthesis under Microwave Irradiation over Heterogeneous Solid Catalysts

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Author
Bouasla, Souad
Amaro-Gahete, J.
Esquivel, Dolores
López, M. Isabel
Jiménez-Sanchidrián, César
Teguiche, Mabrouk
Romero-Salguero, F.J.
Publisher
MDPI
Date
2017
Subject
Phenol
Ethyl acetoacetate
Solvent-free
Microwave irradiation
Heterogeneous acid catalysts
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Abstract
A suitable methodology of synthesis of coumarin derivatives by Pechmann reaction over heterogeneous solid acid catalysts in a free solvent media under microwave irradiation is described. Resorcinol, phenol and ethyl acetoacetate were selected as model reactants in the Pechmann condensation. The catalytic activity of several materials—Amberlyst-15, zeolite and sulfonic acid functionalized hybrid silica—in solvent-free microwave-assisted synthesis of the corresponding coumarin derivatives has been investigated in detail. 7-Hydroxy-4-methylcoumarin and 4-methylcoumarin were obtained in 97% and 43% yields, respectively, over Amberlyst-15. This was the most active catalyst in the Pechmann reaction under studied conditions
URI
http://hdl.handle.net/10396/17401
Fuente
Molecules 22(12), 2072 (2017)
Versión del Editor
http://dx.doi.org/10.3390/molecules22122072
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