Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors for cancer treatment. Its spirocyclic structure and functional groups make it valuable in medicinal chemistry for enhancing selectivity and metabolic stability in drug candidates. Commonly employed in research settings to construct complex heterocyclic systems with biological activity. Also utilized in the preparation of protease inhibitors and central nervous system agents due to its ability to mimic peptide bonds and interact with enzyme active sites.