Used as a chiral auxiliary in asymmetric synthesis, particularly in the preparation of enantiomerically pure sulfonamides and sulfoxides. Its rigid cyclic structure and stereochemical stability make it valuable for controlling stereochemistry during carbon–carbon bond formation. Commonly employed in pharmaceutical intermediates where high enantioselectivity is required. The tert-butyl ester group allows for easy introduction and subsequent removal under mild acidic conditions, making it suitable for multi-step synthetic routes. Its sulfonamide functionality also serves as a directing group in metal-catalyzed transformations.