反应详情

Into a 25 mL flask was weighed 1.52 g (4.48 mmol) of 5-bromomethyl-1-(2-chlorophenyl)-3-trifluoromethyl-1H-pyrazole, 854 mg of 4-bromophenol, 584 mg of sodium carbonate, then 5 mL of DMF, and 5 mL of acetonitrile were added. The resulting suspension was stirred and heated at 80-850C for 20 h then was washed into a separatory funnel with ethyl acetate and water. The ethyl acetate was separated, washed with brine, dried (Na2SO4), and concentrated in vacuo. The residue was purified by silica gel flash chromatography (Biotage, 80 g Silica gel, gradient elution from 100% hexanes to 40% ethyl acetate over 30 minutes). Appropriate fractions were combined and concentrated in vacuo to afford the product as a colorless solid, yield: 1.917 g (99%); 1H NMR (400 MHz, DMSO-d6): δ 7.82 (m, 2H), 7.70 (dt, J=1.5, 7.5 Hz, 1H), 7.62 (dt, J=1.5, 7.5 Hz, 1H), 7.49 (d, J=9 Hz, 2H), 7.27 (s, 1H), 6.92 (d, J=9 Hz, 2H), 5.12 (s, 2H); MS (ES): 431 [M+H]+.

1. customInto a 25 mL flask was weighed
2. temperatureheated at 80-850C for 20 h
3. washthen was washed into a separatory funnel with ethyl acetate and water
4. customThe ethyl acetate was separated
5. washwashed with brine
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated in vacuo
8. customThe residue was purified by silica gel flash chromatography (Biotage, 80 g Silica gel, gradient elution from 100% hexanes to 40% ethyl acetate over 30 minutes)
9. concentrationconcentrated in vacuo