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The title compound was prepared by a similar method to that of Preparation 9 using 1,1,1-trifluorohexane-2,4-dione and 3,5-dichlorobenzaldehyde. The crude product was purified by flash chromatography on silica gel eluting with a solvent gradient of pentane gradually changing to pentane:ethyl acetate (5:1, by volume). The product was further purified by flash chromatography eluting with dichloromethane:pentane (1:10, by volume) to afford a mixture of the title compounds (500 mg) as a yellow oil.

1. customThe crude product was purified by flash chromatography on silica gel eluting with a solvent gradient of pentane
2. customThe product was further purified by flash chromatography
3. washeluting with dichloromethane:pentane (1:10, by volume)
4. customto afford