Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of central nervous system agents. It serves as a building block for compounds with potential antihypertensive, analgesic, and neuroactive properties. Commonly employed in research for creating novel isoquinoline-based derivatives targeting neurological disorders such as Parkinson’s disease and depression. Also utilized in the preparation of selective receptor ligands for dopamine and serotonin receptors. Its chloro-substituted structure enhances reactivity in cross-coupling reactions, making it valuable in medicinal chemistry for drug discovery.