Used as a chiral auxiliary in asymmetric synthesis, enabling the selective formation of enantiomerically enriched amines and amino acid derivatives. Its structure facilitates high stereocontrol in nucleophilic addition reactions, particularly in the synthesis of biologically active molecules such as pharmaceuticals and agrochemicals. Commonly employed in the preparation of chiral intermediates via Ellman’s sulfinimine chemistry, allowing efficient access to primary and secondary amines with excellent enantiomeric purity. Widely applied in medicinal chemistry for the development of optically active drugs, including protease inhibitors and central nervous system agents.