Boron tribromide → 2-(2,4-Dichlorophenyl)benzoxazol-5-ol

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Reaction Steps

2-(2,4-dichlorophenyl)-5-methoxybenzoxazole (0.5 g, 1.7 mmol) was dissolved in 25 mL of dichloromethane. To the solution was added BBr3 (8 mmol) and the mixture was stirred at room temperature for 48 hours. The mixture was then diluted with 25 mL dichloromethane, and washed sequentially with saturated NaHCO3 (2×25 mL) and brine. The organic layer was separated, dried over MgSO4 and filtered. The solvent was removed, to provide 2-(2,4-dichlorophenyl)benzoxazol-5-ol, a compound of formula (g), which was purified using flash chromatography.

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