Boron tribromide → 2-(2,3-Difluoro-4-hydroxyphenyl)acetic acid

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A solution of boron tribromide (1M in DCM, 13.4 mL) was added dropwise to suspension of 2-(2,3-difluoro-4-methoxyphenyl)acetic acid (1.18 g) in DCM (5 mL) at −78° C. The reaction was allowed to warm to RT and stirred overnight. The reaction was cooled to −78° C. and a solution of boron tribromide (1M in DCM, 13.4 mL) was added. The reaction was allowed to warm to RT and stirred for 1 h. The reaction was poured onto ice. The resulting aqueous solution was extracted with DCM (5×50 mL). The aqueous phase was then extracted with ethyl acetate (3×100 mL). The organic solutions were combined, washed with brine (50 mL), dried over magnesium sulphate, filtered and evaporated to give the subtitled compound as a tan solid. Yield 1.09 g.

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