General procedure for the synthesis of 2-bromo-3-fluoroaniline from 2-bromo-3-fluoro nitrobenzene: 2-bromo-1-fluoro-3-nitrobenzene (1.0 g, 5.0 mmol) was dissolved in methanol (50 mL) at 0 °C, and NiCl? (2.2 g, 10 mmol) and NaBH? (0.50 g, 14 mmol) were added sequentially. After the addition was completed, the reaction mixture was stirred at 0 °C for 5 min. Subsequently, the reaction was quenched by the addition of water (20 mL) and extracted with ethyl acetate (20 mL x 3). The organic layers were combined, dried over anhydrous Na?SO? and concentrated under reduced pressure to afford 2-bromo-3-fluoroaniline (600 mg, 70% yield). The product was characterized by 1H NMR (400 MHz, CDCl?): δ 7.07-7.02 (m, 1H), 6.55-6.49 (m, 1H), 4.22 (br s, 2H).
