tert-Butyl 2,6-diazaspiro[3.4]octane-2-carboxylate can be used to synthesize ketohexokinase (KHK) inhibitors that have potential medical uses for treating diabetes and obesity.tert-Butyl 2,6-diazaspiro[3.4]octane-2-carboxylate is also a useful reagent for the synthesis of dihydroisoindolecarboxamide derivatives asNicotinamide Phosphoribosyltransferase (NAMPT) andRho-associated protein kinase (ROCK)inhibitors.