Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and other bioactive molecules. Its spirocyclic structure provides structural rigidity, which enhances selectivity and metabolic stability in drug candidates. The Boc-protected amine and carboxylic acid functionalities allow for straightforward coupling and deprotection steps in multi-step organic syntheses. Commonly employed in medicinal chemistry for constructing complex heterocyclic systems targeting central nervous system disorders and cancer therapeutics.