O-tert-Butyl-L-threonine is a protected derivative of the naturally occurring amino acid L-threonine. It features a tert-butyl ether group protecting the hydroxyl side chain, making it a valuable chiral building block in organic synthesis, particularly for peptide chemistry and medicinal chemistry. Its primary application is as a key intermediate in the synthesis of complex pharmaceutical compounds. The tert-butyl protecting group enhances solubility in organic solvents and prevents unwanted side reactions during peptide coupling steps, allowing for the controlled introduction of the threonine moiety into target molecules. It is frequently employed in the research and development of peptide-based drugs and bioactive molecules. This compound is a specialty chemical used in laboratory-scale synthesis and process development. Handling requires standard precautions for amino acid derivatives, and it should be stored in a cool, dry place.