反应详情

23.5 g (167 mmol) of 1-acetyl-4-piperidone (Aldrich Chemical Co., Milwaukee, Wis.) and 12.5 g (179 mol) of hydroxylamine hydrochloride were placed in a 250 mL flask with 200 mL of methanol. To the resulting mixture was added 19.0 g (180 mmol) of sodium carbonate, and the resulting mixture was allowed to stir at room temperature for 12-14 h. The reaction mixture was concentrated in vacuo to afford 23.5 g of 1-acetyl-4-hydroxyiminopiperidine as a white solid: 1H NMR (300 MHz, CDCl3) δ3.72 (dd, 2H, J=11.0, 6.0 Hz), 3.59 (ddd, 2H, J=13.8, 6.2, 6.2 Hz), 2.68 (ddd, 2H, J=10.6, 6.2, 6.2 Hz), 2.42 (ddd. 2H, J=12.2, 6.1, 6.1 Hz), 2.17 (d, 3H, J=3.9 Hz); 13C NMR (75 MHz, CDCl3) δ169.39, 169.29, 156.07, 155.78, 45.95, 44.31, 41.68, 39.65, 31.27, 30.46, 25.04, 24.42, 21.47, 21.44.

1. concentrationThe reaction mixture was concentrated in vacuo