Used in organic synthesis as an intermediate for pharmaceuticals and bioactive compounds. The iodo group allows for cross-coupling reactions such as Suzuki or Heck reactions, enabling the construction of complex isoquinoline derivatives. The methoxy substituent enhances electron density, influencing reactivity and selectivity in ring transformations. Commonly applied in the development of kinase inhibitors, antimicrobial agents, and fluorescent probes due to the isoquinoline core’s affinity for biological targets. Also serves as a building block in materials science for designing electron-transport materials in optoelectronic devices.