Used as an intermediate in the synthesis of pharmaceutical compounds, particularly in the development of kinase inhibitors and other biologically active molecules. Its spirocyclic structure and protected functional groups make it valuable in medicinal chemistry for constructing complex heterocyclic systems. Commonly employed in research settings to build drug candidates targeting cancer, inflammation, and central nervous system disorders. The tert-butyl ester group allows for selective deprotection, enabling stepwise synthesis in multi-stage reactions.