Abstract
An efficient catalyst-free synthesis of α,α-bis(4-hydroxycoumarin-3-yl)toluene was performed by the reaction of 4-hydroxycoumarin with aromatic aldehydes in aqueous media under microwave irradiation. The reaction was completed in short reaction time of 8–10 min with high yields of 76–94, was environmental benign, and had easy workup. Their structures were confirmed by IR spectra, 1H NMR, 13C NMR, and elemental analysis.
ACKNOWLEDGMENT
We thank the Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials for financial support.
Notes
a Microwave power: 150 W; reactive temperature: 150 °C.
b Yields of the isolated products.