N-Benzoyl-L-leucine is primarily used in the field of peptide synthesis as a protecting group for the amino acid leucine. It helps in preventing unwanted reactions at the leucine site during the synthesis process, ensuring the correct sequence of amino acids in the peptide chain. This compound is also utilized in biochemical research to study enzyme interactions and mechanisms, particularly those involving leucine. Additionally, it serves as an intermediate in the production of various pharmaceuticals, contributing to the development of drugs that target specific biological pathways. Its role in organic synthesis further extends to the creation of complex molecules for use in medicinal chemistry and material science.