Journal
LETTERS IN ORGANIC CHEMISTRY
Volume 5, Issue 8, Pages 607-615Publisher
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/157017808786857570
Keywords
Acid catalysis; chromones; coumarins; dihydrocoumarins; flavones; microwave; solvent-free; Wells-Dawson heteropolyacid
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Funding
- Agencia Nacional de Promocion Cientifica y Tecnologica (Argentina)
- Fundacion Antorchas
- Universidad Nacional de La Plata
- CONICET
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Simple, clean, environmentally friendly procedures for the solvent-free preparation of coumarins, dihydrocoumarins, flavones and chromones under microwave heating are described. Silica-supported Wells-Dawson heteropolyacid (H6P2W18O62 center dot 24 H2O) was employed as catalyst. High selectivity, very good yields and short reaction times were obtained. The results are compared with those of the reactions performed under conventional heating.
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