Used in pharmaceutical synthesis as a key building block for developing bioactive molecules, particularly in the design of kinase inhibitors and CNS-targeted drugs. Its spirocyclic structure and protected amine functionality make it valuable for constructing complex heterocycles with improved metabolic stability. Commonly employed in medicinal chemistry for scaffold diversification and optimization of drug candidates. Also utilized in the preparation of PROTACs (proteolysis-targeting chimeras) due to its favorable linker properties and spatial geometry.