Used in pharmaceutical research, 2-Azaspiro[3.5]nonane hydrochloride serves as a key intermediate in the synthesis of various bioactive compounds. It is particularly valuable in the development of drugs targeting neurological disorders, such as Alzheimer's disease and depression, due to its spirocyclic structure, which can mimic natural neurotransmitters. Additionally, it is employed in the creation of ligands for receptor studies, aiding in the understanding of complex biochemical pathways. Its versatility also extends to organic synthesis, where it is utilized to build complex molecular frameworks for further chemical exploration.