Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and other biologically active compounds. Its structure allows for selective functionalization, making it valuable in drug discovery for building complex heterocyclic systems. Commonly employed in cross-coupling reactions such as Suzuki and Buchwald-Hartwig aminations to form carbon-carbon and carbon-nitrogen bonds. Also utilized in the preparation of organic semiconductors and materials for optoelectronic applications due to the electron-rich nature of the thienopyridine core.