Used as a key intermediate in organic synthesis, particularly in pharmaceutical and agrochemical industries. It serves as a protected form of 2-ethynylaniline, enabling selective reactions in multi-step syntheses. The tert-butyloxycarbonyl (Boc) group allows for easy deprotection under mild acidic conditions, making it ideal for constructing complex molecules. Commonly employed in the preparation of heterocyclic compounds, including indoles and other nitrogen-containing rings, which are prevalent in bioactive molecules. Its alkyne functionality also enables use in click chemistry, especially copper-catalyzed azide-alkyne cycloaddition (CuAAC), for efficient molecular assembly in drug discovery and materials science.