Methanol → 4,4,4-Trifluoro-1-(4-pyrazol-1-yl-phenyl)-butane-1,3-dione

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A 5.4 N solution of sodium methoxide in methanol (3.0 mL, 16.2 mmol) was added drop wise over 10 min to a solution of ethyl trifluoro-acetate (1.81 mL, 15.2 mmol) in 2-ethoxy-2-methyl-propane (20 mL) at 20° C. followed by the addition of a suspension of 1-(4-pyrazol-1-yl-phenyl)-ethanone (2.57 g, 13.8 mmol) in 2-ethoxy-2-methyl-propane (10 mL). The reaction mixture was stirred for 22 h at 20° C. and then poured onto ice-water (50 mL). The mixture was extracted with ethyl acetate and the organic layer was washed with brine, dried over sodium sulfate and evaporated under reduced pressure. The remaining solid was recrystallized from ethyl acetate/heptane to give the title compound (2.47 g, 63%) as off-white solid. Mp 96° C.

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