反应详情

Sodium carbonate (1.35 g, 13 mmol) and dimethyl sulfate (2.17 g, 17 mmol) were added to a solution of 4-hydroxy-6-trifluoromethylpyran-2-one (3.0 g, 17 mmol) in acetone (50 mL). The mixture was heated under reflux for 3 hours and, after cooling, filtered. Concentration of the filtrate resulted in 2.9 g of crude product as a brown oil. It was possible to obtain 4-methoxy-6-trifluoromethylpyran-2-one (2.74 g, 14 mmol, 83%) as colorless needles with a melting point of 61° C. by crystallization from hexane.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 3 hours
3. temperatureafter cooling
4. filtrationfiltered
5. customConcentration of the filtrate resulted in 2.9 g of crude product as a brown oil