9-Oxa-2,6-diazaspiro[4.5]decane-2-carboxylic Acid 1,1-Dimethylethyl Ester is a useful chemical reactant, used in the production of PRMT5 inhibitors. PRMT5 inhibitors have potential use in the treatment or prevention of a wide array of conditions ranging from metabolic disorders, autoimmune disorders, cancer, inflammatory diseases, cardiovascular diseases, neurodegenerative diseases, pancreatitis, multiorgan failure, kidney diseases, platelet aggregation, sperm motility, transplantation rejection, graft rejection, and lung injuries.