N-bromobutanimide → 2-Amino-5-bromo-3-fluorobenzoic acid

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A solution of 2-amino-3-fluorobenzoic acid (10.85 g, 70 mmol) in dichloromethane (175 mL) was added N-bromosuccinimide (12.46 g, 70 mmol), and the mixture was stirred at room temperature for 2 hours. The precipitate was filtered and washed with dichloromethane (100 mL*3) to give the title compound (12.7 g, 78%) as a grey solid, which was directly used in the next step without further purification. MS (ES+) C7H5BrFNO2 requires: 233, 235, found: 232, 234 [M+H]+.

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