Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and other bioactive molecules. Its spirocyclic structure and protected functional groups allow selective deprotection and coupling reactions, making it valuable in medicinal chemistry for building complex nitrogen-containing heterocycles. Commonly employed in solid-phase and solution-phase peptide-like synthesis due to the orthogonal protection of its amines. Also utilized in the preparation of protease inhibitors and receptor modulators where precise stereochemical arrangement is required.