Used as a key intermediate in organic synthesis, particularly in the preparation of pharmaceutical compounds. It serves as a protected amine building block in the construction of complex molecules, especially in the development of bioactive agents and drug candidates. The tert-butyl carbamate (Boc) group provides stability during reactions while allowing selective deprotection under mild acidic conditions. The ethynyl functionality enables further derivatization via click chemistry or coupling reactions, making it valuable in medicinal chemistry for creating libraries of compounds for biological screening. Commonly employed in the synthesis of protease inhibitors and receptor modulators.