efficient production of 2-amino-4h-chromenes and 14-aryl-14h-dibenzo[a, j]xanthenes catalyzed by n, n-diethyl-n-sulfoethanaminium hydrogen sulfate

In this study, acidic ionic liquid n, n-diethyl-n-sulfoethanaminium hydrogen sulfate {[et3n-so3h]hso4} was utilized to promote two classes of useful organic transformations under solvent-free conditions including, i) the condensation of arylaldehydes with malononitrile and 1-naphthol, leading to 2-amino-4h-chromenes, and ii) the condensation reaction of arylaldehydes with 2-naphthol to give 14-aryl-14h-dibenzo[a, j]xanthenes. the ionic liquid efficiently catalyzed the reactions, and the products were obtained in excellent yields (94-98%) within short reaction times (8-30 min).