Water → 2-(4-(3-Fluoro-4-trifluoromethoxyphenyl)-3,5-difluorophenyl)-5-pentylpyrimidine

Participants

Reaction Conditions

Reaction Steps

In 80 ml of THF was dissolved 8.0 g (30 mmol) of the 2-(3,5-difluorophenyl)-5-pentylpyrimidine described above, and cooled down to −60° C. under nitrogen gas atmosphere. To this solution was added dropwise 20 ml of 1.60 M solution of n-butyl lithium (32 mmol) in hexane while maintaining the condition that the temperature of the solution did not exceed −50° C., and then stirred at the same temperature for 1 hour. Subsequently, 64 ml of 0.5 M solution of zinc chloride (32 mmol) in THF was added dropwise to the reaction solution while maintaining the condition that the temperature of the solution did not exceed −50° C., warmed up to room temperature, and then stirred for 30 min. To this solution were added 0.5 g of tetrakistriphenylphosphine palladium and 8.3 g of 3-fluoro-4-trifluoromethoxybromobenzene, and heated to reflux for 3 hours. To the reaction solution was added 100 ml of water, and the product was extracted with toluene. The extract was washed with 3N-hydrochloric acid, saturated aqueous solution of sodium bicarbonate, and saturated aqueous solution of sodium chloride in turn, and dried over anhydrous magnesium sulfate. The solvent was distilled off. The residue was purified by silica gel column chromatography (eluent: heptane/toluene=1/1), and then recrystallized twice from heptane/ethyl acetate=1/1 to obtain 0.09 g (0.2 mmol) of 2-(4-(3-fluoro-4-trifluoromethoxyphenyl)-3,5-difluorophenyl)-5-pentylpyrimidine. Yield of this product from 2-(3,5-difluorophenyl)-5-pentylpyrimidine was 0.7%.

Provenance & Evidence