反应详情

温度

23 °C

To tert-butyl 4-(2-methyl-4-(methylcarbamoyl)phenyl)piperazine-1-carboxylate (1.90 g, 5.70 mmol) was added Hydrochloric acid solution (17.10 mL, 68.4 mmol) in dioxane at 23° C. The reaction was stirred at 23° C. for 30 min. The resulting suspension was diluted with Et2O (20 mL), filtered, rinsed with Et2O (3×10 mL), and the resulting solid was dried in vacuo to provide N,3-dimethyl-4-(piperazin-1-yl)benzamide dihydrochloride (1.70 g, 5.55 mmol, 97% yield) as an off-white, hygroscopic solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 2.28 (s, 3 H) 2.72-2.79 (m, 3 H) 3.05-3.14 (m, 4 H) 3.17-3.28 (m, 4 H) 7.06 (d, J=8.34 Hz, 1 H) 7.64-7.68 (m, 1 H) 7.68-7.70 (m, 1 H) 8.29-8.39 (m, 1 H) 9.36 (br. s., 2 H). ESI-MS: m/z 234.2 (M+H)+.

1. filtrationfiltered
2. washrinsed with Et2O (3×10 mL)
3. customthe resulting solid was dried in vacuo