Journal
TETRAHEDRON LETTERS
Volume 54, Issue 29, Pages 3773-3776Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2013.05.008
Keywords
Bismuth trifluoromethanesulfonate; Addition; 4-Hydroxycoumarin; Chalcone; Annulation; Pyrano[3,2-c]coumarin
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Funding
- Sasol Ltd
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A Bi(OTf)(3)-catalyzed tandem addition/annulation reaction is described in order to synthesize pyrano [3,2-c]coumarins under solvent-free conditions. Substituted/unsubstituted chalcones were conveniently condensed with various 4-hydroxycoumarins by means of this environmentally benign method which produces water as the only side product. (C) 2013 Elsevier Ltd. All rights reserved.
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