4-(1,4-Dioxaspiro[4.5]dec-8-yl)morpholine is an intermediate in the synthesis of 4-[4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)cyclohex-3-en-1-yl]morpholine (T3026350), a reactant used in the preparation of azaindole derivatives as c-Jun N-terminal kinase inhibitors.