Formic Acid → 6-Bromo-4H-imidazo[4,5-b]pyridine

Participants

Reaction Steps

2,3-Diamino-5-bromopyridine (4.10 g, 21.8 mmol) in formic acid (25 mL) was stirred at 100° C. for 4 hours. The reaction mixture was allowed to cool to room temperature and concentrated under reduced pressure, and the resulting residue was mixed with water and adjusted to pH 8 or above with saturated aqueous sodium hydrogen carbonate. The precipitated solid was collected by filtration, washed with water and chloroform and dried under reduced pressure to give the title compound as a dark brown solid (4.13 g, yield 96%).

Provenance & Evidence