L-Homophenylalanine tert-Butyl Ester Hydrochloride is primarily used in the synthesis of peptides and pharmaceutical intermediates. It serves as a protected form of L-homophenylalanine, enabling controlled reactions in peptide bond formation. This compound is particularly valuable in the development of drugs targeting neurological disorders, as homophenylalanine derivatives are known to interact with neurotransmitter systems. Additionally, it is employed in research to study enzyme inhibition and receptor binding, aiding in the discovery of new therapeutic agents. Its tert-butyl ester group provides stability during synthesis, making it a reliable building block in organic and medicinal chemistry.