Used in pharmaceutical synthesis as a protected intermediate for constructing bioactive molecules, particularly in the development of protease inhibitors and central nervous system agents. The Boc-protected hydroxyl-ethynyl pyrrolidine scaffold allows for selective functionalization via click chemistry or cross-coupling reactions, enabling efficient assembly of complex heterocyclic compounds. Its structural features support conformational control and hydrogen bonding, making it valuable in medicinal chemistry for optimizing potency and metabolic stability.