Potassium Carbonate → Methyl 5-cyclopropyl-3-(2-(trifluoromethoxy)phenyl)isoxazole-4-carboxylate

Participants

Reaction Steps

Potassium carbonate (11 g, 79.7 mmol, 1.09 equiv) was suspended in THF (100 mL) and the mixture was stirred. A solution of methyl 3-cyclopropyl-3-oxopropanoate (11 g, 77.5 mmol, 1.06 equiv) in 50 ml THF was added to the above stirred mixture and stirred fo(30 min at −10°C. To this reaction mixture was added a solution of (Z)-2-(trifluoromethoxy)benzoyl chloride oxime (17.6 g, 73.3 mmol, 1.00 equiv) in THF (50 mL) at −5°C. and then allowed to stir fo(6 h at 35°C. The reaction mixture was diluted with 200 mL of H2O, extracted with ethyl acetate (2×300 mL). The organic layer was washed with brine (2×200 mL), dried over anhydrous sodium sulfate, concentrated under vacuum, and then purified by silica gel column chromatography using ethyl acetate/petroleum ether (1:100-1:20) eluent to afford methyl 5-cyclopropyl-3-(2-(trifluoromethoxy)phenyl)isoxazole-4-carboxylate as a white solid.

Provenance & Evidence