5-Trifluoromethylthiophene-3-one → 4-methyl-2-[4-(trifluoromethyl)phenyl]-5-[[5-(trifluoromethyl)-3-thienyl]oxy]-2H-1,2,3-triazole

Participants

Reaction Conditions

Reaction Steps

Potassium tert-butoxide (0.30 g, 2.6 mmol) and 5-trifluoromethylthiophene-3-one (0.44 g, 2.6 mmol) were dissolved in acetonitrile (4 mL). A solution of crude 1-methoxy-4-methyl-2-[4-(trifluoromethyl)phenyl]-2H-1,2,3-triazolium tetrafluoroborate (1:1) (i.e., the product of Example 1, Step B, 0.70 g, 2.0 mmol) in acetonitrile (4 mL) was added at once. The reaction mixture was stirred at 23° C. for 27 h. The reaction mixture was diluted with water (20 mL) and extracted with diethyl ether (2×25 mL). The organic layer was dried (MgSO4) and concentrated under reduced pressure. The crude residue was purified by chromatography on silica gel eluting with 0 to 5% ethyl acetate in hexanes to afford the title compound (0.105 g) as a colorless solid.

Provenance & Evidence