反应详情

N-bromosuccinimide (5.84 g, 32.8 mmol) was added to a room temperature solution of 4-(5-chloropyridin-3-yl)-3-[(trans-4-methylcyclohexyl)methyl]-3H-imidazo[4,5-c]pyridine-6-carbonitrile (4 g, 10.9 mmol) stirring in degassed chloroform (54.7 mL). The reaction was heated to reflux for 1 hour. The mixture was cooled to room temperature, diluted with dichloromethane, and washed with saturated aqueous sodium thiosulfate (2×) and brine. The organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by silica gel chromatography (0-100% ethyl acetate/hexanes, linear gradient) to afford 2-bromo-4-(5-chloropyridin-3-yl)-3-[(trans-4-methylcyclohexyl)methyl]-3H-imidazo[4,5-c]pyridine-6-carbonitrile. MS ESI calc'd. for C20H19BrClN5 [M+H]+ 444. found 444. 1H NMR (500 MHz, DMSO-d6) δ 8.87 (s, 1H), 8.84 (s, 1H), 8.57 (s, 1H), 8.40 (s, 1H), 3.86 (d, J=6.1, 2H), 1.44 (d, J=12.1, 2H), 1.15-1.05 (broad, 1H), 1.00-0.85 (broad, 1H), 0.85-0.73 (m, 4H), 0.72 (d, J=6.1, 3H), 0.56-0.43 (m 2H).

1. temperatureThe reaction was heated
2. temperatureto reflux for 1 hour
3. washwashed with saturated aqueous sodium thiosulfate (2×) and brine
4. dry with materialThe organic layer was dried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by silica gel chromatography (0-100% ethyl acetate/hexanes, linear gradient)