Primarily utilized in organic synthesis, 6-azaspiro[3.5]nonan-5-one serves as a key intermediate in the development of complex molecules, particularly in pharmaceuticals. Its spirocyclic structure is valuable for constructing biologically active compounds, often used in drug discovery for targeting neurological disorders and other therapeutic areas. Additionally, it is employed in the synthesis of ligands and catalysts for various chemical reactions. Its unique ring system also makes it a useful scaffold in material science for designing advanced polymers and functional materials.