Ammonium Chloride → 1-[8-Amino-2-(4-fluorophenyl)imidazo[1,2-a)pyridin-3-yl]ethanone

Participants

Reaction Steps

A solution of 1-[2-(4-fluorophenyl)-8-nitroimidazo[1,2-α]pyridin-3-yl]ethanone (100 mg, 0.33 mmol) in methanol (3 mL) was added to a suspension of iron (93 mg, 1.7 mmol) and ammonium chloride (149 mg, 2.8 mmol) in aqueous methanol. This reaction mixture was heated to reflux for 10 hours. The reaction mixture was filtered and the filtrate concentrated under reduced pressure to a solid. This solid was purified by silica gel chromatography (5% methanol in dichloromethane) to give 63 mg (70%) of 1-[8-amino-2-(4-fluorophenyl)imidazo[1,2-α]pyridin-3-yl]ethanone as a foam. 1H NMR (CDCl3): δ 9.21 (d, 1H), 7.61 (m, 2H), 7.25 (m, 2H), 6.94 (t, 1H) 6.72 (d, 1H), 4.63 (broad s, 2H), 2.19 (s, 3H); MS m/z 270 (M+1).

Provenance & Evidence