Used in organic synthesis, particularly in peptide coupling reactions, where it serves as a protected form of L-isoleucine. The allyl ester group allows for selective deprotection under mild conditions, making it valuable in the stepwise construction of peptides. It is also employed in the preparation of amino acid derivatives for pharmaceutical research, aiding in the development of bioactive compounds and drug candidates. Additionally, its p-toluenesulfonate salt form enhances solubility and stability, facilitating its use in various chemical processes.