反应详情

温度

0 °C

To 1-methyl-4-nitropyrazole-3-carboxylic acid (2.0 g) in THF (30 ml) was charged carbonyl-1,1′-diimidazole (1.9 g) over 1 hour at room temperature. The reaction was stirred overnight before cooling to 0° C. A solution of dimethylamine in THF (12 ml of a 2M solution) was added and the reaction stirred for 1 hour. The THF layer was separated and concentrated in vacuo. The crude product was purified by column chromatography on silica (30 g), eluting with 100% EtOAc (300 ml) to give N,N,1-trimethyl-4-nitropyrazole-3-carboxamide, 1235 mg.

1. stirringthe reaction stirred for 1 hour
2. customThe THF layer was separated
3. concentrationconcentrated in vacuo
4. customThe crude product was purified by column chromatography on silica (30 g)
5. washeluting with 100% EtOAc (300 ml)