2-Azaspiro[5.5]undecane-2,9-dicarboxylic acid 2-tert-butyl ester is primarily used in organic synthesis as a key intermediate in the development of complex molecules. Its spirocyclic structure makes it valuable in the design and synthesis of pharmaceuticals, particularly in the creation of compounds with potential therapeutic effects. The tert-butyl ester group provides stability during synthetic processes, allowing for selective reactions at other functional sites. This compound is often utilized in medicinal chemistry to build frameworks for drug candidates targeting neurological disorders, as its rigid structure can mimic certain biological molecules. Additionally, it serves as a precursor in the preparation of ligands for catalysis, aiding in the development of efficient catalytic systems for industrial applications.