Used in organic synthesis as a protected building block for pyrazole-based compounds, particularly in pharmaceutical and agrochemical research. The Boc-protected nitrogen allows selective reactivity at the ethynyl group, enabling click chemistry or cross-coupling reactions. Commonly employed in the development of bioactive molecules, including kinase inhibitors and antiviral agents, due to the pyrazole core’s prevalence in drug design. The alkyne functionality supports conjugation via Sonogashira coupling or copper-catalyzed azide-alkyne cycloaddition (CuAAC), making it valuable in combinatorial chemistry and library synthesis.