Environmentally benign and one-pot synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes catalyzed by acyclic Brønsted acidic ionic liquid [H-NMP][HSO4] under green conditions

A convenient and efficient direct protocol for the preparation of 14-aryl-14H-dibenzo[a,j]-xanthenes was described. The condensation of 2-naphthol with various aromatic aldehydes in the presence of a catalytic amount of [H-NMP][HSO4] as a Brønsted acidic ionic liquid under solvent-free conditions at 110 °C was described. This method has the following advantages: the reaction workup is very easy, and the catalyst is smoothly recycled to catalyze the preparation of 14-aryl-14H-dibenzo[a,j]xanthenes with high yields through a green and one-pot procedure. The corresponding products have been obtained in excellent yields, with high purity, and in short reaction times.

A convenient and efficient direct protocol for the preparation of 14-aryl-14H-dibenzo[a,j]xanthenes was described. The condensation of β-naphthol with various aromatic aldehydes in the presence of a catalytic amount of [HNMP][HSO4] as a Brønsted acidic ionic liquid under solvent-free conditions at 110 °C was described. The corresponding products have been obtained in excellent yields, with high purity, and in short reaction times.Figure optionsDownload as PowerPoint slide