How is 5-Bromo-2-(methylsulfanyl)-4-pyrimidinecarboxylic acid (CAS: 50593-92-5) typically synthesized?

5-Bromo-2-(methylsulfanyl)-4-pyrimidinecarboxylic acid is typically synthesized through the bromination of 2-(methylthio)-4-pyrimidinecarboxylic acid. This process often involves the use of bromine in an appropriate solvent, such as acetic anhydride, under anhydrous conditions. The reaction is highly selective and yields the desired product with good efficiency. Post-synthesis purification is usually achieved by recrystallization from an appropriate solvent.