Benzene, 1-iodo-3-(trifluoromethyl)- → 2,2-Difluoro-1-[3-(trifluoromethyl)phenyl]-1-propanone

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A solution of 2-propylmagnesium chloride in THF (1.3 M, 7.5 ml) was cooled to −15° C. and admixed with 1-iodo-3-(trifluoromethyl)benzene (2.80 g, 10.2 mmol). The reaction mixture was stirred at −15° C. for 1 h, warmed to room temperature and admixed dropwise with a solution of 2,2-difluoro-N-methoxy-N-methylpropanamide (1.43 g, 9.35 mmol: prepared according to Synth. Comm. 2008 (38), 1940-1945), and stirred at room temperature overnight. Then the mixture was added to ice-cold dilute hydrochloric acid and extracted with ethyl acetate. The combined organic phases were dried over sodium sulphate and concentrated under reduced pressure. The residue was purified by means of silica gel chromatography with the eluent cyclohexane/ethyl acetate (EA) (0% FA to 30% EA).

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