Dimethyl Sulfide → 5-[4-(4-Trifluoromethylphenoxy)phenoxy]-2,4-hexanedione

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Reaction Steps

To a stirred solution of N-chlorosuccinimide (0.40 g, 3 mmol) in toluene (10 ml) at -10° under argon is added dimethylsulfide (0.3 ml, 4 mmol). The mixture is cooled to -25°, and 4-hydroxy-5-[4-(4-trifluoromethylphenoxy)phenoxy]-2-hexanone (2 mmol) in several ml of toluene is added dropwise. After 2 hours at -25°, the mixture is cooled to -60°, and a solution of 0.31 g (3 mmol) of triethylamine in several ml of toluene is added dropwise. The reaction mixture is allowed to slowly warm to RT and is quenched by the addition of 5 ml of water. The mixture is poured into ether, and the organic fraction is then separated, washed with 5% HCl, water and brine, and dried over sodium sulfate. Solvent is removed and the residue is purified by prep. TLC to give 5-[4-(4-trifluoromethylphenoxy)phenoxy]-2,4-hexanedione (IX; Z is trifluoromethyl, Y is hydrogen, W is oxygen, R1 is methyl and R2 is methyl).

Provenance & Evidence