C[O:2][CH:3](OC)[CH2:4][N:5]1[CH2:10][CH2:9][CH2:8][CH2:7][C:6]1=[O:11]>O1CCCC1>[O:11]=[C:6]1[CH2:7][CH2:8][CH2:9][CH2:10][N:5]1[CH2:4][CH:3]=[O:2]A mixture of 1-(2,2-dimethoxyethyl)-piperidin-2-one (1.06 g, 5.67 mmole) in 5% aqueous tetrahydrofuran (20 mL) was heated under reflux for 1 hour. The mixture was dried with anhydrous magnesium sulfate, filtered, and concentrated to give (2-oxo-piperidin-1-yl)-acetaldehyde (0.69 g) as a pale yellow oil.
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