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2005
Benzopyran derivatives
R 0350
Condensation of Chromone-3-carboxaldehyde with Phenylacetic Acids: An EffiSynthesis of (E)-3-Styrylchromones. — The title reaction of (I) with various
20- 129 cient
phenylacetic acids under classical heating and microwave irradiation is investigated.
The (E)-3-styrylchromones (III) and (V) are obtained in good yields using a 5-fold
excess of the acids in the presence of potassium tert-butoxide. The beneficial effect
of microwave irradiation is the shortening of the reaction time. — (SILVA, V. L. M.;
SILVA*, A. M. S.; PINTO, D. C. G. A.; CAVALEIRO, J. A. S.; PATONAY, T.;
Synlett 2004, 15, 2717-2720; Dep. Chem., Univ. Aveiro, P-3810 Aveiro, Port.; Eng.)
— Steudel
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