反应详情

A solution of 2-ethyl-2H-pyrazole-3-carboxylic, di-iso-propylethylamine, and N,O-dimethylhydroxylamine hydrochloride in N,N-dimethylformamide was stirred at 0° C. (Benzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate was added and the reaction mixture was slowly warmed to room temperature. The reaction was stirred for 18 hours. The mixture was concentrated, and 20% 2-propanol in dichloromethane added. The mixture was washed with a saturated aqueous solution of sodium bicarbonate, dried over sodium sulfate, and concentrated. The crude material was purified by flash chromatography to give 2-ethyl-2H-pyrazole-3-carboxylic acid methoxy-methyl-amide. 1H NMR (250 MHz, CDCl3) δ 7.47 (d, J=2 Hz, 1H), 6.71 (d, J=2 Hz, 1H), 4.48 (quart, J=7.3 Hz, 2H), 3.62 (s, 3H), 3.34 (s, 3H), 1.42 (t, J=7.0 Hz, 3H).

1. additionwas added
2. concentrationThe mixture was concentrated
3. addition20% 2-propanol in dichloromethane added
4. washThe mixture was washed with a saturated aqueous solution of sodium bicarbonate
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated
7. customThe crude material was purified by flash chromatography