Aurones are natural bioactive dyes found in plants, and many of them are biologically active. We reported herein that α,β-dicarbonyl compounds condense with 3-coumarones without a solvent under microwave irradiation with clay as a catalyst. Novel acylaurones were obtained in good yields; the more stable E-isomer was formed stereoselectively.

Condensation of two molecule of 3-coumaranone with aromatic carbonyl compounds is catalyzed by PFAT under microwave irradiation, new dicoumararan-3-ones are obtained.