Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) requiring high enantiomeric purity. Its protected amine and chiral pyrrolidine structure make it valuable in asymmetric synthesis and medicinal chemistry, especially for drugs targeting central nervous system disorders and enzyme inhibitors. Commonly employed in the preparation of protease inhibitors and receptor agonists/antagonists due to its favorable stereochemistry and functional group compatibility.