Used as a key intermediate in the synthesis of pharmaceutical compounds, particularly in the development of bioactive molecules and drug candidates. Its spirocyclic structure and functional groups make it valuable for constructing complex heterocyclic systems found in medicinal chemistry. Commonly employed in peptide mimetics and protease inhibitor design due to its conformational rigidity and ability to mimic amino acid frameworks. Also utilized in solid-phase and solution-phase synthesis where the Boc-protected amine allows for controlled deprotection and coupling steps.