Used as a chiral auxiliary in asymmetric synthesis, particularly in the preparation of enantiomerically pure β-amino acids and other nitrogen-containing compounds. Its rigid cyclic structure and stereogenic center enable high diastereoselectivity during alkylation or acylation reactions. After serving its role in controlling stereochemistry, the auxiliary can be cleaved under mild conditions, leaving the desired chiral product intact. Commonly employed in pharmaceutical synthesis where stereochemical purity is critical.