[CH:1]1([CH2:7][CH:8]2[CH:13]([OH:14])[CH2:12][C:11]([CH3:16])([CH3:15])[NH:10][C:9]2([CH3:18])[CH3:17])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.[CH:19](O)=O.C=O.[OH-].[Na+]>O1CCOCC1>[CH:1]1([CH2:7][CH:8]2[CH:13]([OH:14])[CH2:12][C:11]([CH3:16])([CH3:15])[N:10]([CH3:19])[C:9]2([CH3:18])[CH3:17])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1Into a 100 ml-flask equipped with a thermometer, a cooling tube, a dropping funnel and a magnetic stirrer were introduced 3.8 g (15 mmol) of 3-cyclohexylmethyl-2,2,6,6-tetramethyl-4-piperidinol prepared in Example B1, 70 ml of dioxane and 0.78 g (17 mmol) of formic acid, and the content of the flask was heated to 80° C. When the temperature of the content of the flask was constant, 2.44 g (30 mmol) of 37% aqueous formaldehyde dissolved in 20 ml of dioxane was added gradually through the dropping funnel, followed by heating at the temperature for 10 hours. The content of the flask was cooled to room temperature, and 5% aqueous NaOH was added so that the pH became 8, followed by extraction with 200 ml of diethylether. The extract obtained was washed with 30 ml of water 3 times, 10 g of magnesium sulfate was added and, after it was kept standing for ca. 2 hours, the solution was filtered and concentrated to give 3.95 g (yield: 98%) of the title compound as a white solid product.
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