N-tert-butyloxycarbonyl-3-azabicyclo[3.3.0]octane is a Boc-protected bicyclic secondary amine used as a building block in organic synthesis. The tert-butyloxycarbonyl (Boc) group shields the nitrogen functionality during chemical reactions, preventing unwanted side reactions. This protection strategy is particularly useful in multi-step syntheses such as peptide synthesis and peptidomimetics, where selective deprotection allows for controlled assembly of complex molecules. The compound is widely applied in pharmaceutical development as a key intermediate for biologically active compounds, providing precise control over modifications. Its stability across diverse reaction conditions and rigid bicyclic scaffold make it invaluable in medicinal chemistry and drug discovery.