反应详情

温度

60 °C

4-Ethynyl-1-methyl-1H-pyrazole (20) (4.11 g, 38.7 mmole) was dissolved in DMF (95 mL) and N-(2-bromo-5-iodopyridin-4-yl)methanesulfonamide 8 (12.18 g 32.3 mmole) was added. To the solution was added triethylamine (19.6 mL, 14.1 g 139 mmole) and copper(I) iodide (214 mg 1.12 mmole). The reaction was sealed and flushed with nitrogen. Bis(triphenylphosphine)palladium dichloride (797 mg 1.13 mmole) was added and the reaction was again flushed with nitrogen and heated at 60° C. for 105 minutes. Most of the DMF was evaporated and the residue taken up in ethyl acetate (350 ml). The solution was washed with water (3×100 mL) and brine. Each aqueous fraction was backwashed with the same 100 mL portion of ethyl acetate. The combined organics were dried and evaporated. The residue was flash chromatographed (silica) eluting with dichloromethane, 1:4 ethyl acetate:dichloromethane, 1:1 ethyl acetate:dichloromethane and ethyl acetate to give the title compound (5.19 g 45.9%). 1H-NMR (CDCl3, 500 MHz): δ 2.98 (s, 3H), 4.01 (s, 3H), 6.69 (d, J=0.95 Hz, 1H), 7.73 (s, 1H), 7.78 (s, 1H), 8.25 (t, J=0.95 Hz, 1H), 8.64 (d, J=0.95 Hz, 1H).

1. customThe reaction was sealed
2. customflushed with nitrogen
3. customthe reaction was again flushed with nitrogen
4. customMost of the DMF was evaporated
5. washThe solution was washed with water (3×100 mL) and brine
6. customThe combined organics were dried
7. customevaporated
8. customchromatographed (silica)
9. washeluting with dichloromethane, 1:4 ethyl acetate