54127-30-9

41667-95-2

54127-30-9

The general procedure for the synthesis of 5,6-dichloro-3-pyrimidinemethanol from 5,6-dichloropyridine-3-carboxylic acid was as follows: 859 mL (859 mmol) of a tetrahydrofuran solution of 1 M borane/tetrahydrofuran complex was slowly added dropwise to 110 g (573 mmol) of 5,6-dichloronicotinic acid in 250 mL of a tetrahydrofuran solution at 0 °C. The reaction mixture was gradually warmed to room temperature and stirred continuously at that temperature for 3 hours. Upon completion of the reaction, the mixture was cooled to 0°C and subsequently adjusted to alkaline with saturated aqueous potassium carbonate solution. Most of the tetrahydrofuran was removed on a rotary evaporator and the residue was extracted several times with ethyl acetate. The organic phases were combined, washed sequentially with water and saturated aqueous sodium chloride, and then dried over sodium sulfate. The organic phases were concentrated under reduced pressure and the resulting residue was purified by silica gel column chromatography (silica gel 60-Merck, particle size: 0.04 to 0.063 mm) with ethyl acetate:cyclohexane (1:2) as the mobile phase, resulting in 62 g (61% yield) of (5,6-dichloropyridin-3-yl)methanol. The product was characterized by 1H-NMR (CD3CN): δ[ppm] = 3.31 (t, 1H), 4.60 (d, 2H), 7.85 (s, 1H), 8.26 (s, 1H).