L-Homophenylalanine tert-Butyl Ester Hydrochloride is primarily used in the synthesis of peptides and pharmaceutical intermediates. It serves as a building block in organic chemistry, particularly in the development of bioactive compounds and drug candidates. The tert-butyl ester group provides protection for the carboxylic acid functionality during peptide synthesis, allowing for selective reactions to occur. This compound is also employed in research settings to study enzyme inhibitors and receptor ligands, contributing to advancements in medicinal chemistry. Its stability and reactivity make it a valuable reagent in the production of complex molecules for therapeutic applications.