Used as a chiral auxiliary in asymmetric synthesis, enabling the selective formation of stereoisomers in pharmaceutical intermediates. Its rigid structure and ability to coordinate with metal catalysts make it valuable in enantioselective reactions, particularly in the production of beta-lactam antibiotics and other bioactive molecules. Commonly employed in alkylation, aldol, and Diels-Alder reactions to control stereochemistry. After serving its role, it can be cleaved under mild conditions without racemization, preserving the desired chirality in the final product.