反应详情

4-iodo-1H-pyrazole (0.95 g, 4.94 mmol) and 2-bromo-N,N-dimethylacetamide (Preparation 98, 0.82 g, 4.94 mmol) were dissolved in dry DMF (10 ml). To the stirred solution was added potassium carbonate (1 g, 7.35 mmol) and the reaction mixture was stirred for 24 hours. The solid was filtered and the solution was diluted with dichloromethane (50 ml) and water (30 ml). The organic solution was collected, dried and concentrated in vacuum. The crude was purified by silica gel column chromatography eluting with neat ethyl acetate to afford the title compound as a white crystalline solid (1.1 g, 80%). 1H-NMR (500 MHz, CDCl3): δ 3 (s, 3H), 3.09 (s, 3H), 5 (s, 2H), 7.54 (s, 1H), 7.6 (s, 1H).

1. filtrationThe solid was filtered
2. additionthe solution was diluted with dichloromethane (50 ml) and water (30 ml)
3. customThe organic solution was collected
4. customdried
5. concentrationconcentrated in vacuum
6. customThe crude was purified by silica gel column chromatography
7. washeluting with neat ethyl acetate