Ultrasound-promoted regio and chemoselective synthesis of pyridazinones and phthalazinones catalyzed by ionic liquid [bmim]Br/AlCl3

Abstract The first ultrasound-promoted multicomponent synthesis of pyridazinones and phthalazinones from arenes, cyclic anhydrides and ArNHNH 2 in the presence of an efficient recyclable catalyst, [bmim]Br/AlCl 3 , in high yield and short reaction time is reported.