Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and anticancer agents. Its structure allows for selective functionalization, making it valuable in medicinal chemistry for constructing complex heterocyclic systems. Commonly employed in cross-coupling reactions such as Suzuki or Buchwald-Hartwig aminations to introduce aryl or amino groups, enabling the optimization of biological activity in drug candidates. Also utilized in research settings for the preparation of isoquinoline-based compounds with potential neurological or anti-inflammatory effects.