Abstract
Several (E)- and (Z)-3-styrylchromones were prepared by two different methodologies, the Wittig reaction of chromone-3-carboxaldehyde with benzylic ylides and the Knoevenagel condensation of chromone-3-carboxaldehyde with phenylacetic acids in the presence of potassium tert-butoxide under microwave irradiation. The Knoevenagel reaction followed by a decarboxylation offered an efficient and diastereoselective method for preparing (E)-3-styrylchromones in a shorter reaction time. It was also demonstrated that phenylacetic acid can also be substituted with success by phenylmalonic acid. The stereochemistry of all products was assigned by NMR experiments.
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Correspondence: Artur M. S. Silva, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal.
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Silva, V., Silva, A., Pinto, D. et al. Syntheses of (E)- and (Z)-3-styrylchromones. Monatsh Chem 139, 1307–1315 (2008). https://doi.org/10.1007/s00706-008-0926-0
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DOI: https://doi.org/10.1007/s00706-008-0926-0