An efficient and fast synthesis of 4-aryl-3,4-dihydrocoumarins by (CF3SO3)3Y catalysis under microwave irradiation

A new and efficient synthesis of eleven 4-aryl-3,4-dihydrocoumarins, in which six are new compounds, was performed using (CF3SO3)3Y as catalyst under microwave irradiation. The target compounds were obtained in good yields (68–80%) and remarkable time (7–20 min) when compared to the literature reports (1–40 h).