反应详情

To a solution of 1-carbobenzyloxy-4-(3-pyridyl)piperidin-4-ol (described in example 87d) (3.17 g, 10.2 mmol) in ethanol (100 mL) was added 10% palladium on carbon (2.0 g). This was followed by cyclohexene (50 mL) in large excess. The reaction was heated to reflux under nitrogen for 2 h. The suspension was cooled, filtered and the catalyst rinsed with fresh ethanol The filtrate was reduced in vacuo to yield 1.70 g (94%) of an off-white solid which did not require any additional purification. 1H NMR (D6 -DMSO, 300 MHz) 8.68 (d, J=2.0 Hz, 1H), 8.42 (dd, J=1.5, 4.6 Hz, 1H), 7.83 (ddd, J=1.9, 2.1, 4.0 Hz, 1H), 7.35 (dd, J=4.8, 8.0 Hz, 1H), 2.97 (ddd, J=2.3, 12.2 Hz, 2H), 2.78 (m, 2H), 1.86 (ddd, J=4.5, 12.9 Hz, 2H), 1.56 (m, 2H), 2.50 (m, 1H) MS (CI, CH4) m/z 179 (M+1,100), 207 (M+29,16), 161 (39)

1. temperatureThe reaction was heated
2. temperatureto reflux under nitrogen for 2 h
3. temperatureThe suspension was cooled
4. filtrationfiltered
5. washthe catalyst rinsed with fresh ethanol The filtrate