Used as a chiral auxiliary in asymmetric synthesis, particularly in the preparation of enantiomerically pure sulfonamides and β-amino acids. Its rigid cyclic structure and stereochemical stability allow for high diastereoselectivity in alkylation and acylation reactions. Commonly employed in pharmaceutical intermediates where control of stereochemistry is critical, such as in the synthesis of protease inhibitors or bioactive molecules with sulfur-containing functional groups. The tert-butyl carbamate (Boc) protection offers compatibility with various reaction conditions and facilitates easy deprotection when needed.