N-Carbobenzoxy-DL-norleucine is primarily used in peptide synthesis as a protecting group for amino acids. It helps in preventing unwanted reactions during the formation of peptide bonds, ensuring the correct sequence and structure of the peptide. This compound is particularly valuable in organic chemistry and biochemistry research, where precise control over peptide synthesis is crucial. Additionally, it finds application in the development of pharmaceuticals, enabling the production of complex peptides with high purity and specificity. Its role in protecting the amino group during chemical reactions makes it a key reagent in the synthesis of biologically active peptides and proteins.