L-Leucine tert-butyl ester hydrochloride is a chemical compound with the molecular formula C10H20ClNO2. It is a derivative of the naturally occurring amino acid L-Leucine, featuring a tert-butyl ester group and a hydrochloride salt. L-Leucine tert-butyl ester hydrochloride is commonly used in organic synthesis, particularly in peptide synthesis, as a protecting group for the carboxylic acid function of L-Leucine. The tert-butyl ester group provides a stable and easily removable protecting group, which is crucial for the selective synthesis of complex peptides and other biomolecules. The hydrochloride salt form enhances the solubility and stability of the compound in various reaction conditions. L-Leucine tert-butyl ester hydrochloride is an essential building block in the field of medicinal chemistry and biotechnology, contributing to the development of new drugs and therapeutic agents.