Used in peptide synthesis and pharmaceutical intermediates, Boc-L-phenylalaninol serves as a chiral building block in the development of active pharmaceutical ingredients. Its protected amine group allows for selective reactions, making it valuable in solid-phase and solution-phase synthesis. It is commonly employed in the preparation of protease inhibitors and other bioactive molecules where stereochemistry is critical. Additionally, it acts as a precursor in synthesizing peptidomimetics and enzyme inhibitors used in research and drug discovery.