How is 5-Bromo-2-chloro-3-fluoropyridine (CAS: 831203-13-5) typically synthesized?

5-Bromo-2-chloro-3-fluoropyridine (CAS: 831203-13-5) is commonly synthesized through a multistep process involving the introduction of bromine, chlorine, and fluorine functionalities onto pyridine. Typical methods include the use of bromination and chlorination of 3-fluoropyridine followed by further functionalization. Catalysts such as fuming sulfuric acid are often employed to control the reaction selectivity and yield.