Used as an intermediate in organic synthesis, particularly in the preparation of pharmaceuticals and bioactive compounds. Its structure allows for functionalization at multiple sites, making it valuable in the development of nitrogen-containing heterocyclic systems. Commonly employed in research settings to construct complex isoquinoline derivatives with potential antitumor, antimicrobial, or anti-inflammatory properties. Also utilized in cross-coupling reactions and nitro-group transformations to generate amines or other substituted derivatives for drug discovery and medicinal chemistry applications.