Used as a chiral auxiliary or intermediate in asymmetric synthesis, particularly in the pharmaceutical industry for the preparation of enantiomerically pure compounds. Its rigid oxazolidine ring structure helps control stereochemistry during key bond-forming reactions, such as alkylations, aldol additions, or reductions. The tert-butoxycarbonyl and tert-butyl groups provide steric bulk and stability, facilitating high diastereoselectivity. After serving its purpose, the auxiliary can be cleaved under mild acidic conditions, leaving the desired chiral product intact. Commonly employed in the synthesis of complex bioactive molecules, including protease inhibitors and other therapeutic agents.