2-(3-Bromoimidazo[1,2-a]pyrimidin-7-yl)propan-2-ol → 2-[3-(2,4-Difluoro-3-(pyridin-3-yl)phenyl)imidazo[1,2-alpha]pyrimidin-7-yl]propan-2-ol

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-(3-bromoimidazo[1,2-α]pyrimidin-7-yl)propan-2-ol (256 mg, 1.0 mmol) and 2,4-difluoro-3-(pyridin-3-yl)benzeneboronic acid (352 mg, 1.5 mmol) in tetrahydrofuran (3 ml) and sodium carbonate (1.25 ml of a 2M solution in water, 2.5 mmol) was degassed with nitrogen for 10 min. Tetrakis(triphenylphosphine)palladium(0) (58 mg, 0.05 mmol) was added and this mixture was heated at 65° C. for 24 h. The reaction was cooled to ambient temperature then partitioned between dichloromethane and saturated aqueous sodium hydrogencarbonate. The organics were dried over anhydrous magnesium sulfate, filtered and pre-adsorbed onto silica. Purification by chromatography on silica gel eluting with dichloromethane (containing 1% conc. ammonia) on a gradient of methanol (1-5%) gave 2-[3-(2,4-difluoro-3-(pyridin-3-yl)phenyl)imidazo[1,2-α]pyrimidin-7-yl]propan-2-ol as a pale yellow oil which solidified on standing (200 mg, 44%). Bis-hydrochloride salt (from ethyl acetate/ethanol): δH (360 MHz, d6-DMSO) 1.56 (6H, s), 7.62 (1H, t, J 9), 7.79-7.84 (1H, m), 7.86 (1H, s), 7.88 (1H, s), 8.32 (1H, d, J 8), 8.54 (1H, s), 8.80 (1H, d, J 5), 8.98 (1H, s), 9.27 (1H, dd, J 7 and 3).

Provenance & Evidence