Used as a chiral intermediate in the synthesis of pharmaceutical compounds, particularly in the development of bioactive molecules requiring stereochemical control. Its piperazine backbone is common in drugs targeting central nervous system disorders, and the tert-butoxycarbonyl (Boc) protection allows for selective functionalization in multi-step syntheses. Commonly employed in medicinal chemistry for constructing peptidomimetics and receptor ligands where the (S)-configuration is critical for biological activity.