反应详情

To a solution of 5-isopropyl-4-nitropyrazol-3-carboxamide (2.57 g; 12.97 mmol), methanol (20 mL) and water (5 mL) was added 0.7 g Raney Ni (W5). The mixture was stirred under hydrogen atmosphere (760 torr) for four hours. The reaction mixture was filtered, the filtrate was concentrated to dryness in vacuo and the residue was recrystallized from ethyl acetate to yield 1.94 g (89%) of the product. The product was purified by chromatography on silica gel, the mixture of chloroform/methanol (97/3) was used as mobile phase. Yield 95%; mp=178-179° C.; MS (ES+): 169.1 (100%, M+H+). 1H NMR (CD3OD; 400 MHz): 1.31 d (6H; J=7.5 Hz), 3.06 sept (1H; J=7.5 Hz), 4.83 s (2H).

1. filtrationThe reaction mixture was filtered
2. concentrationthe filtrate was concentrated to dryness in vacuo
3. customthe residue was recrystallized from ethyl acetate