L-Homophenylalanine ethyl ester hydrochloride is primarily used in the synthesis of peptides and pharmaceutical compounds. It serves as a key intermediate in the production of chiral molecules, particularly in the development of drugs targeting neurological and cardiovascular diseases. Its ethyl ester group enhances solubility, making it suitable for various organic reactions. Additionally, it is utilized in research for studying enzyme mechanisms and as a building block in medicinal chemistry for designing biologically active compounds. Its chiral nature also makes it valuable in asymmetric synthesis, contributing to the creation of enantiomerically pure substances.