Sodium Bicarbonate → 2-Bromo-1-(3-cyclopropylmethoxy-4-difluoromethoxyphenyl)ethanone

Participants

Reaction Steps

To 250 ml of isopropanol solution containing 10.8 g (42.3 mmol) of 1-(3-cyclopropylmethoxy-4-difluoromethoxyphenyl)ethanone (see WO 9206963) was added 36.5 g (97.1 mmol) of trimethylphenylammonium tribromide at room temperature, and the mixture was stirred at room temperature for 5 hours. After completion of the reaction, a saturated aqueous solution of sodium hydrogencarbonate was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer after separation was washed with a saturated aqueous solution of sodium chloride, dried over anhydrous magnesium sulfate, and then, concentrated under reduced pressure to obtain 16.5 g of the title compound as a pale yellowish solid substantially quantitatively.

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