Used primarily as an intermediate in the synthesis of pharmaceuticals and biologically active compounds. Its halogen substituents allow for selective cross-coupling reactions, making it valuable in the development of kinase inhibitors and other targeted therapies. Commonly employed in medicinal chemistry for constructing isoquinoline-based scaffolds with potential antitumor, anti-inflammatory, or antimicrobial activity. Also utilized in research settings to prepare fluorescent probes and functionalized heterocycles for drug discovery.