How is 5-bromo-7-fluoro-1H-indole (CAS: 883500-73-0) typically synthesized?

5-Bromo-7-fluoro-1H-indole can be synthesized via a multistep process involving bromination and fluorination of 1H-indole. Commonly, the bromination is carried out using bromine in the presence of a Lewis acid catalyst like aluminum bromide. The fluorination step typically utilizes hydrogen fluoride or trifluoroacetic anhydride. The overall yield and selectivity depend on the specific reaction conditions and catalysts used.