Used as a chiral auxiliary in asymmetric synthesis, particularly in the preparation of enantiomerically pure β-amino acids and peptides. Its sulfinyl group enables stereocontrol during key bond-forming reactions, making it valuable in pharmaceutical synthesis where precise stereochemistry is critical. Commonly employed in aldol reactions and alkylations to achieve high diastereoselectivity. After serving its role, the auxiliary can be cleaved under mild conditions, leaving the desired chiral product intact.