Diethyl Ether → 1-(3,5-Dichloro-2-pyridyl)-3-trifluoromethylpropane-1,3-dione

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Reaction Steps

15.8 g of 3,5-dichloro-2-acetylpyridine are introduced together with 12.0 ml of trifluoroethyl acetate into 125 ml of absolute ether. With stirring, the mixture is cooled using an ice-bath and 46.6 ml of, a 21% sodium ethanolate solution in ethanol are added dropwise. The ice-bath is then removed and the mixture is subsequently stirred overnight at 25° C. After cooling the reaction mixture in an ice-bath and adding dropwise 7.5 ml of glacial acetic acid, the mixture is concentrated in vacuo. 39.0 g of 1-(3,5-dichloro-2-pyridyl)-3-trifluoromethylpropane-1,3-dione are obtained, which can be used directly for the following cyclisation step.

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