反应详情

A mixture of 1-(4-nitro-phenyl)-piperidine-4-one (Synthesis 1981, 606) (4.0 g, 18 mmol) and 500 mg of 10% Pd/C in 75 mL of methylene chloride was hydrogenated under H2 (5˜10 psi) for 1 hour. The catalyst was then removed by filtering through a short pad of silica gel. The filtrate was treated with hydrogen chloride gas and the precipitate was collected to give 2 g of the title compound as a tan solid; 1H NMR (300 MHz, DMSO-d6) δ 2.44 (t, J=6.0 Hz, 4H), 3.65 (t, J=6.0 Hz, 4H), 7.14 (d, J=9.0 Hz, 2H), 7.25 (d, J=9.0 Hz, 2H); MS (ES) m/z: 190.9 (MH+); HRMS Calcd. for C11H15N2O (MH+): 190.1106. Found: 190.1096.

1. customThe catalyst was then removed
2. filtrationby filtering through a short pad of silica gel
3. additionThe filtrate was treated with hydrogen chloride gas
4. customthe precipitate was collected