3-BROMOIMIDAZO[1,2-B]PYRIDAZINE

766-55-2

18087-73-5

Imidazo[1,2-b]pyridazine (6.0 g, 50.4 mmol) was used as starting material, and N-bromosuccinimide (NBS, 6.0 g, 75.6 mmol) and a catalytic amount of azobisisobutyronitrile (AIBN) were added in 50 mL of chloroform. The reaction mixture was heated and refluxed for 2 h, during which the progress of the reaction was monitored by thin layer chromatography (TLC). Upon completion of the reaction, the mixture was cooled to room temperature and subsequently stirred under ice bath conditions to promote precipitation. The precipitate was separated by filtration and the filtrate was concentrated to afford the target product 3-bromoimidazo[1,2-b]pyridazine as a pale yellow solid in 75% yield.