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

The first ultrasound-promoted multicomponent synthesis of pyridazinones and phthalazinones from arenes, cyclic anhydrides and ArNHNH2 in the presence of an efficient recyclable catalyst, [bmim]Br/AlCl3, in high yield and short reaction time is reported.

► The first ultrasound-promoted multicomponent synthesis of pyridazinones and phthalazinones is reported.
► All of synthesized compound were characterized by IR, 1H NMR, 13C NMR and elemental analyses.
► This is the first report for application of ionic liquid as solvent for the synthesis of pyridazinone and phethalazinone.