Used in organic synthesis as an intermediate for pharmaceuticals and bioactive compounds. Serves as a building block in the development of nitrogen-containing heterocyclic systems, which are common in medicinal chemistry. Applied in research for potential antimicrobial, antitumor, and anti-inflammatory agents due to the isoquinoline scaffold’s biological relevance. Also utilized in the preparation of fluorescent dyes and optoelectronic materials where extended conjugation and electron-donating groups enhance photophysical properties. Commonly employed in catalysis studies and ligand design for metal complexes in homogeneous catalysis.