5-Bromo-2,4-dichloropyrimidine → (2,4-Dichloro-pyrimidin-5-yl)-(2,3-difluoro-6-methoxy-phenyl)-methanol

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Reaction Conditions

Reaction Steps

A solution of 5-bromo-2,4-dichloropyrimidine (18.8 g, 82.5 mmol, Aldrich) in tetrahydrofuran (50 mL) was chilled to −30° C. and isopropylmagnesium chloride (41.25 mL, 82.5 mmol, 2M in tetrahydrofuran, Aldrich) was added. The mixture was stirred at −30° C. for 20 minutes and a solution of 2,3-difluoro-6-methoxybenzaldehyde (12.91 g, 75 mmol, Apollo) in tetrahydrofuran (40 mL) was added slowly at this temperature. The mixture was then stirred at 0° C. for one hour and quenched with aqueous ammonium chloride. Extraction with ethyl acetate and crystallization from ethyl ether/hexanes gave 20.5 g of rac-(2,4-dichloro-pyrimidin-5-yl)-(2,3-difluoro-6-methoxy-phenyl)-methanol as a light yellow solid, MP 99-101° C. MS(ES) MH+322

Provenance & Evidence