Water → HCID 17862447, compound

Participants

Reaction Steps

N-Bromosuccinimide (0.64 g, 3.6 mmol) was added to a solution of N-ethyl-3-(3-chloro-5-trifluoromethylpyridin-2-yloxy)-5-methylpyrazole-1-carboxamide (1.05 g, 3.0 mmol) in dichloromethane (20 ml), and the mixture was stirred at room temperature for 6 hours. After completion of the reaction, water was added to the reaction mixture, and the mixture was extracted with ethyl acetate (10 ml×3). An organic layer was washed with water, dried over anhydrous magnesium sulfate and filtered to remove a desiccant. The solvent was distilled off from the filtrate under reduced pressure. The resultant crude product was purified with a silica gel column (ethyl acetate/hexane=1/7), to give a white solid of N-ethyl-4-bromo-3-(3-chloro-5-trifluoromethylpyridin-2-yloxy)-5-methylpyrazole-1-carboxamide (0.86 g, yield: 67.0%). mp: 123-125° C.; 1H-NMR (CDCl3, TMS, ppm): δ 1.23 (t, J=7.3 Hz, 3H), 2.67 (s, 3H), 3.40 (dq, J=5.9 and 7.3 Hz, 2H), 6.90-7.10 (m, 1H), 8.04 (d, J=2.0 Hz, 1H), 8.32 (m, 1H).

Provenance & Evidence