DL-3-(t-Butoxy)alanine t-butyl ester hydrochloride is a protected derivative of the amino acid alanine. It features both the amino group and the carboxylic acid group protected as the tert-butyl ester and tert-butyl ether, respectively, making it a versatile chiral building block in organic synthesis. The hydrochloride salt form enhances its stability and handling properties. This compound is primarily employed as a key chiral intermediate in the synthesis of complex pharmaceutical molecules. Its protected serine-like structure makes it valuable for constructing peptide mimetics and other bioactive compounds where the introduction of a β-alkoxy alanine moiety is required. It is particularly useful in medicinal chemistry for the development of protease inhibitors and other therapeutic agents. As a protected amino acid derivative, it serves as a crucial synthon in solid-phase peptide synthesis (SPPS) and solution-phase methodologies. The tert-butyl protecting groups are orthogonal to many other common protecting groups and can be cleaved under relatively mild acidic conditions, allowing for selective deprotection in multi-step syntheses.