Used in organic synthesis and pharmaceutical research, particularly as a building block for complex heterocyclic compounds. Its alkyne functionality allows participation in click chemistry reactions, such as copper-catalyzed azide-alkyne cycloaddition (CuAAC), enabling efficient molecular assembly. Commonly applied in the development of bioactive molecules, including potential kinase inhibitors and anticancer agents. Also serves as a ligand or intermediate in catalysis and medicinal chemistry due to its rigid isoquinoline scaffold and reactivity profile.