反应详情

温度

200 °C

To 4-(3-cyanopropyl)-1-piperidinecarboxaldehyde (10 g, 0.055M), there was added ethylenediamine p-toluenesulfonate (30 g, 0.129M) and the mixture was heated at 200° C. for 41/2 hours. The reaction mixture was dissolved in ethanol (100 ml), basified with MeONa (0.26M), filtered and stripped to dryness. The residue was distilled at 170° C., 0.025 mmHg to give 4-[3-(4,5-dihydro-1H-imidazol-2-yl)propyl]piperidine (7.86 g, 72% yield).

1. filtrationfiltered
2. distillationThe residue was distilled at 170° C.