反应详情

1-(Bromomethyl)-4-(trifluoromethyl)benzene (6.36 g, 26.6 mmol) was added to a stirred solution of 4,6-dichloro-3H-imidazo[4,5-c]pyridine (5.0 g, 26.6 mmol) and cesium carbonate (10.40 g, 31.9 mmol) in DMA (30.0 ml) at room temperature and was stirred for 2 h. Water was added, and the solids were filtered and dried overnight. Crude 1H NMR showed ˜4:1 ratio of undesired 4,6-dichloro-1-(4-(trifluoromethyl)benzyl)-1H-imidazo[4,5-c]pyridine:desired 4,6-dichloro-3-(4-(trifluoromethyl)benzyl)-3H-imidazo[4,5-c]pyridine. The crude residue was purified by silica gel chromatography (EtOAc/DCM, 0% to 20%) to afford the desired 4,6-dichloro-3-(4-(trifluoromethyl)benzyl)-3H-imidazo[4,5-c]pyridine (fraction 1) and the undesired 4,6-dichloro-1-(4-(trifluoromethyl)benzyl)-1H-imidazo[4,5-c]pyridine (fraction 2). 4,6-dichloro-3-(4-(trifluoromethyl)benzyl)-3H-imidazo[4,5-c]pyridine: MS ESI calc'd for C14H8Cl2F3N3 [M+H]+ 346. found 346.

1. filtrationthe solids were filtered
2. customdried overnight
3. customThe crude residue was purified by silica gel chromatography (EtOAc/DCM, 0% to 20%)