Bromine → 5-bromo-6-(trifluoromethyl)-1H-pyrimidin-4-one

Beteiligte Stoffe

Reaktionsschritte

77.5 g (945.0 mmoles) of anhydrous sodium acetate was added, at room temperature, to a solution of 49.2 g (300.0 mmoles) of 4-hydroxy-6-trifluoromethylpyrimidine dissolved in 600 ml of acetic acid. Thereto was gradually added 50.3 g (315 mmoles) of bromine at 45° C. The resulting mixture was stirred at the same temperature for 3 hours to give rise to a reaction. After confirmation of the completion of the reaction, the reaction mixture was subjected to vacuum distillation to remove the solvent contained therein. The residue was poured into water, followed by extraction with ethyl acetate. The resulting organic layer was washed with water and an aqueous sodium chloride solution in this order and then dried over anhydrous magnesium sulfate. The resulting solution was subjected to vacuum distillation to remove the solvent contained therein. The residue was washed with n-hexane to obtain 38.9 g (yield: 53.4%) of 5-bromo-4-hydroxy-6-trifluoromethylpyrimidine.

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