Water → 5-{4-(3-chloro-5-trifluoromethylpyridin-2-yloxy)-alpha-fluorobenzyl}-3-(2-chloro-6-fluorophenyl)-1 methyl-1H-1,2,4-triazole

Participants

Reaction Steps

To a solution of 0.9 g of 5-{4-(3-chloro-5-trifluoromethylpyridin-2-yloxy)-α-hydroxybenzyl}-3-(2-chloro-6-fluorophenyl)-1-methyl-1H-1,2,4-triazole in 10 ml of benzene at room temperature, were added 0.85 g of diethylaminosulfur trifluoride (DAST). After stirring at room temperature for 1 hour, the reaction mixture was poured into iced water and extracted with ethyl acetate. The ethyl acetate layer was washed with a saturated aqueous sodium hydrogen carbonate and then with water, dried over magnesium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel chromatography to afford 0.8 g of 5-{4-(3-chloro-5-trifluoromethylpyridin-2-yloxy)-α-fluorobenzyl}-3-(2-chloro-6-fluorophenyl)-1 methyl-1H-1,2,4-triazole.

Provenance & Evidence