Used as a chiral auxiliary in asymmetric synthesis, particularly in the preparation of enantiomerically pure amino acids and amines. Its rigid cyclic structure and stereoselective reactivity make it valuable for controlling stereochemistry during carbon–carbon bond formation. Commonly employed in alkylation and Michael addition reactions, where it directs facial selectivity. After serving its role, the auxiliary can be cleaved under mild conditions, leaving the desired chiral amine or amino acid derivative intact. Its sulfonamide group enhances stability and facilitates crystallization, aiding in purification.