Convenient Synthesis of 14-Aryl-14-H-dibenzo[a,J]xanthenes Catalyzed by Acyclic Bronsted Acidic Ionic Liquid [H-NMP]~+[HSO_4]~- under Microwave Irradiation

摘要

Efficient method for direct preparation of 14-aryl-14-H-dibenzo[a,j]xanthenes through condensation of β-naphthol with various aromatic aldehydes in the presence of the catalytic amount of [H-NMP]~+[HSO_4]~-under microwave irradiation was described. This method has the advantages such as; very easy reaction workup, absolute separation of catalyst from the reaction mixture and smooth recyclability of catalyst. In this reaction 14-aryl-14-H-dibenzo[a,j]xanthenes were obtained as desired products in excellent yields and short reaction times via green and one-pot procedure.