30766-11-1

5-Bromopyridine-2-carboxylic acid is used as a pharmaceutical intermediate. Store in cool, dry place in a well sealed container. Store away from oxidizing agents.

3430-13-5

30766-11-1

4.1.7 Synthesis of 5-bromopyridine-2-carboxylic acid (11): In a 250 mL three-necked flask assembled with a stirrer, thermometer, and condenser tube, add 150 mL of water and 5-bromo-2-methylpyridine (10) (6.0 g, 35 mmol). After turning on the stirring and heating to 80 °C, potassium permanganate (KMnO4) (24.8 g, 157 mmol) was added in three batches at 1 h intervals. The reaction temperature was maintained at 80 °C and stirring was continued for 3-4 hours. Upon completion of the reaction, filtration was carried out to obtain a clarified filtrate. The pH of the filtrate was adjusted to 4-5 with concentrated hydrochloric acid, at which point a white solid precipitated. The filtrate was filtered to collect a small amount of product (11). The filtrate was concentrated under vacuum and an appropriate amount of ethanol was added to the residue to dissolve compound (11), at which time a large amount of white solid precipitated, the filtrate was again withdrawn and the solid discarded. Finally, the filtrate was concentrated under vacuum to give a light yellow solid product (11) (3.0 g, 39% yield).