[O:1]1[C:5]2([CH2:10][CH2:9][CH:8](CN)[CH2:7][CH2:6]2)[O:4][CH2:3][CH2:2]1.[C:13]([O:19]C(=O)C(C)(C)C)(=O)[C:14]([CH3:17])([CH3:16])[CH3:15].[N:26]1C=CC=C[CH:27]=1>CN(C)C1C=CN=CC=1>[O:4]1[C:5]2([CH2:6][CH2:7][CH:8]([N:26]([CH3:27])[C:13](=[O:19])[C:14]([CH3:17])([CH3:16])[CH3:15])[CH2:9][CH2:10]2)[O:1][CH2:2][CH2:3]1To a solution of (1,4-dioxaspiro[4,5]dec-8-yl)methylamine (11.0 g) in pyridine (64 ml) were added 4-dimethylaminopyridine (catalyst quantity) and pivalic acid anhydride (26.0 ml), and stirred at 90° C. for 2 hours. After completion of the reaction, the solvent was evaporated, ethyl acetate was added thereto, and sequentially washed with 1 N hydrochloric acid aqueous solution, 1 N aqueous solution of sodium hydroxide, and saturated brine. The organic layer was dried over sodium sulfate, then the solvent was evaporated, and the obtained residue was purified with silica gel column chromatography (n-hexane/ethyl acetate) to give the titled compound (12.9 g) as a pale brown oil. MS (ESI) m/z: 256 (M+H)+.
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