Used as a key intermediate in the synthesis of biologically active compounds, particularly in pharmaceutical research. Its spirocyclic structure and functional groups make it valuable for constructing complex molecules, especially those targeting central nervous system disorders. The methylsulfonyloxy group acts as a leaving group, enabling nucleophilic substitution reactions to introduce various substituents. The tert-butoxycarbonyl (Boc) group protects the nitrogen, allowing selective deprotection and further derivatization in multi-step syntheses. Commonly employed in the development of kinase inhibitors and neuroactive agents.