Br[C:2]1[CH:7]=[CH:6][C:5]([O:8][C:9]([F:12])([F:11])[F:10])=[C:4]([F:13])[CH:3]=1.[Cu][C:15]#[N:16].[Cu](C#N)C#N>CC(N(C)C)=O>[F:10][C:9]([F:12])([F:11])[O:8][C:5]1[CH:6]=[CH:7][C:2]([C:15]#[N:16])=[CH:3][C:4]=1[F:13]49 g 1-Bromo-3-fluoro-4-trifluoromethoxybenzene was stirred into 100 mL dimethylacetamide together with 20 g copper(I)cyanide at 140° C. overnight. Additional 10 g copper cyanide was added and heating was continued at 150° C. for 4 h. Further 12 g copper cyanide was added and stirring continued at 150° C. overnight. After cooling, the mixture was filtered through Celite/Cellulose and washed with ethyl acetate. The filtrate was added to ice water and filtered again through Celite/Cellulose. The filtrate was extracted with ethyl acetate (×3), dried over magnesium sulfate and concentrated to provide a brown oil which was distilled at 7 mbar and 60° C. to yield two product fractions with 23.5 g and 12 g (content 80%) yield.
Wird geladen…
