N-Carbobenzyloxy-L-leucine is primarily used in peptide synthesis as a protecting group for the amino group of leucine. It helps prevent unwanted reactions during the formation of peptide bonds, ensuring the synthesis proceeds accurately. This compound is particularly valuable in the production of complex peptides and proteins, where selective protection and deprotection of amino acids are crucial. Additionally, it finds applications in the development of pharmaceuticals, especially in the creation of peptide-based drugs, where precise control over molecular structure is essential for efficacy and safety. Its role in organic synthesis also extends to the preparation of intermediates for various bioactive compounds.