6-Bromoimidazo[1,2-a]pyridine

107-20-0

1072-97-5

6188-23-4

(1) Preparation of 6-bromoimidazo[1,2-a]pyridine (4): 2.00 g of 2-amino-5-bromopyridine (3) was dissolved in 35 mL of ethanol, and 2.52 mL of 6.1 mol/L aqueous chloroacetaldehyde solution was added. The reaction mixture was heated to reflux for 3 hours. After completion of the reaction, the reaction mixture was concentrated and saturated aqueous NaHCO3 solution was added to the residue and extracted with ethyl acetate. After conventional post-treatment, 2.30 g of 6-bromoimidazo[1,2-a]pyridine was obtained as a brown powder (yield: 100%).LCMS (ESI) m/z (M + H)+: 368.93.