Bromine → 4-Amino-3-bromo-5-nitropyridine

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A mixture of 3-nitropyridin-4-amine (LXVIII) (10 g, 71.88 mmol) and acetic acid (100 ml) was added to a sealed tube followed by addition of NaOAc (29.50 g, 359 mmol) and dropwise addition of bromine (4.43 ml 86.3 mmol) under stirring. The sealed tube was heated at 100° C. for overnight. The reaction mixture was concentrated under vacuum to obtain a solid which was dissolved in water, basified with saturated aqueous NaHCO3 and extracted with DCM. The combined organic extracts were dried and concentrated to produce 3-bromo-5-nitropyridin-4-amine (LXIX) as a yellow solid (13.7 g, 62.8 mmol, 87% yield). 1H NMR (DMSO-d6, 500 MHz) δ ppm 8.58 (s, 1H), 9.19 (s, 1H); ESIMS found for C5H4BrN3O2 m/z 218.1 (M+H).

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