Used as a key intermediate in the synthesis of nitrogen-containing heterocyclic compounds, particularly in the production of indoles and their derivatives, which are important in pharmaceuticals and agrochemicals. It participates in cyclization reactions, such as transition-metal-catalyzed or acid-mediated processes, to form bioactive molecule scaffolds. Commonly applied in research and development of drugs targeting inflammation, cancer, and central nervous system disorders. Also utilized in materials science for constructing conjugated organic systems and functional polymers.