Used as a chiral building block in the synthesis of pharmaceuticals, particularly in the development of active pharmaceutical ingredients (APIs) where stereochemistry plays a critical role. Its strained aziridine ring undergoes regioselective and stereospecific ring-opening reactions with nucleophiles, enabling efficient construction of complex amine-containing molecules. Commonly employed in the preparation of protease inhibitors, antiviral agents, and other bioactive compounds requiring enantiopure intermediates. Also utilized in the synthesis of chiral ligands for asymmetric catalysis, supporting the production of single-enantiomer drugs.