Used as an intermediate in the synthesis of biologically active compounds, particularly in pharmaceutical research. It serves as a building block for developing isoquinoline-based drugs, which are important in central nervous system therapies, including treatments for neurological and psychiatric disorders. The bromo functional group allows for further cross-coupling reactions, enabling the introduction of diverse substituents for structure-activity relationship studies. Commonly employed in the development of receptor ligands and enzyme inhibitors due to the isoquinoline core’s affinity for various biological targets.