N-bromobutanimide → 3-Bromo-2-(3-fluoro-phenyl)-6-methoxy-pyrazolo[1,5-b]pyridazine

Participants

Reaction Steps

To a stirred solution of 2-(3-fluoro-phenyl)-6-methoxy-pyrazolo[1,5-b]pyridazine-3-carboxylic acid (2.0 g) in anhydrous DMF (20 ml) was added n-bromosuccinimide (1.78 g) and the resulting solution stirred at ambient temperature for 3 hours. The reaction mixture was diluted with ethyl acetate (800 ml) and washed sequentially with water (10×100 ml) and sat. brine (25 ml), dried (Na2SO4), and concentrated to give the title compound as a buff solid (2.19, 93%).

Provenance & Evidence