Used as a chiral auxiliary in asymmetric synthesis, particularly in the preparation of enantiomerically pure amines and amino acids. Its structure allows for high stereoselectivity during nucleophilic addition reactions, making it valuable in pharmaceutical synthesis where specific enantiomers are required for optimal biological activity. The sulfinyl group can be easily removed or modified after the desired transformation, enabling versatile use in multi-step synthetic routes. Commonly employed in the development of active pharmaceutical ingredients (APIs) due to its reliability in controlling stereochemistry.