Hydrochloric Acid → 4-[4-(5-Trifluoromethylpyridin-2-yloxy)-2-ethylphenyl]-2,2,6,6-tetramethylpyran-3,5-dione

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

4-(2-Ethyl-4-hydroxyphenyl)-2,2,6,6-tetramethylpyran-3,5-dione (0.100 g, 0.34 mmol) is added to a mixture of 2-fluoro-5-trifluoromethylpyridine (0.061 g, 0.41 mmol) and potassium carbonate (0.110 g, 0.69 mmol) in N,N-dimethylformamide (2 ml), and the mixture is heated at 140° C. under microwave irradiation for 1 hour. The mixture is cooled to room temperature, then acidified by addition of 2M aqueous hydrochloric acid. The mixture is diluted with dichloromethane and passed through a phase separation cartridge. The organic phase is concentrated to around 2 ml, and purified by preparative reverse phase HPLC to give 4-[4-(5-trifluoromethylpyridin-2-yloxy)-2-ethylphenyl]-2,2,6,6-tetramethylpyran-3,5-dione.

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