反应详情

To a solution of 4-N-benzylpiperidone (5.69 g, 29.5 mmol) in ethanol (4.2 ml) cooled in an ice bath was added ethylamine hydrochloride (2.69 g, 32.3 mmol) in water (3 ml), keeping the internal temperature of the reaction below 10° C. A solution of KCN (2.04 g, 31.3 mmol) in water (7 ml) was added to reaction solution over 10 minutes keeping the internal temperature below 10° C. The reaction was then warmed to room temperature and stirred 18 hr. Isopropanol (10 ml) was added to the reaction mixture to give two distinct layers: lower colorless aqueous layer and an orange organic upper layer. The organic layer was separated and stirred with water (30 ml) for 30 minutes. The organic layer was separated (orange organic layer now the bottom layer) and the orange oil was diluted in CH2Cl2 (30 ml). The organic layer was washed with brine, dried (Na2SO4), filtered and concentrated, in vacuo, to give I-(7A-80)d as an orange oil (6.05 g, 84%): +APCI MS (M+1) 244.2; 1H NMR (400 MHz, CD2Cl2) δ 7.32 (d, J=4.1 Hz, 4H), 7.29–7.23 (m, 1H), 3.54 (s, 2H), 2.81–2.76 (m, 2H), 2.75 (q, J=7.1 Hz, 2H), 2.35–2.29 (m, 2H), 2.01–1.98 (m, 2H), 1.74–1.68 (m, 2H), 1.14 (t, J=7.1 Hz, 3H).

1. customthe internal temperature of the reaction below 10° C
2. customthe internal temperature below 10° C
3. customto give two distinct layers
4. customThe organic layer was separated
5. stirringstirred with water (30 ml) for 30 minutes
6. customThe organic layer was separated (orange organic layer now the bottom layer) and the orange oil
7. additionwas diluted in CH2Cl2 (30 ml)
8. washThe organic layer was washed with brine
9. dry with materialdried (Na2SO4)
10. filtrationfiltered
11. concentrationconcentrated, in vacuo