1-Phenyl-1,6-diazaspiro[3.3]heptane is primarily utilized in the field of medicinal chemistry as a key intermediate or building block in the synthesis of various pharmaceutical compounds. Its unique spirocyclic structure makes it valuable for designing molecules with specific biological activities, particularly in the development of central nervous system (CNS) drugs. It is often employed in research targeting neurological disorders, such as anxiety, depression, and cognitive impairments, due to its ability to interact with neurotransmitter systems. Additionally, its structural features are explored in the creation of novel ligands for receptors and enzymes, aiding in drug discovery and optimization processes.