Efficient synthesis of 12-Aryl-8, 9, 10, 12-tetrahydrobenzo[a]-xanthen-11-ones using ionic liquid pyrazinium di(hydrogen sulfate) {Py(HSO4)2} as a novel, green and homogeneous catalyst

Abstract

An efficient and simple solvent-free procedure for the synthesis of 12-aryl-8, 9, 10, 12-tetrahydrobenzo[a]-xanthen-11-one de-rivatives via the one-pot multi-component condensation of dimedone with aromatic aldehydes and β-naphthol in the presence of protic acidic ionic liquid pyrazinium di(hydrogen sulfate) {Py(HSO4)2} as a green and homogeneous catalyst is described. All reactions proceed efficiently, and the title compounds are produced in high yields and in short reaction times. © 2012, Sociedad Química de México.