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0 °C

To a solution of methyl 4-(2-aminopyridin-3-yl)-2-fluorobenzoate (5.64 g, 22.90 mmol) in acetonitrile (229 mL) was added NBS (4.16 g, 23.36 mmol) in two portions at 0° C. The reaction mixture was stirred at 0° C. for 20 min. After quenched with sat Na2S2O3 and NaHCO3, and stir for 30 min. The reaction mixture was extracted with EtOAc 3 times, the organic washed by sat NaHCO3, water and brine. Dried and concentrated. The crude material was triturated with ether to provide 7.05 g of methyl 4-(2-amino-5-bromopyridin-3-yl)-2-fluorobenzoate in 95% yield. LCMS (m/z): 327.1 (MH+), 0.66 min.

1. customAfter quenched with sat Na2S2O3 and NaHCO3
2. stirringstir for 30 min
3. extractionThe reaction mixture was extracted with EtOAc 3 times
4. washthe organic washed
5. customDried
6. concentrationconcentrated
7. customThe crude material was triturated with ether