Thiomorpholine-2-carboxylic acid hydrochloride is primarily utilized in the field of pharmaceutical research and development. It serves as a key intermediate in the synthesis of various bioactive compounds, particularly those targeting neurological and metabolic disorders. Its structural properties make it valuable for designing molecules with potential therapeutic effects, such as enzyme inhibitors or receptor modulators. Additionally, it is employed in the preparation of peptide analogs and other small molecules for drug discovery programs. Its applications extend to materials science, where it is used in the development of specialized polymers and coatings with unique properties.