[F:1][C:2]1[CH:9]=[C:8]([O:10][CH2:11][C:12]2[CH:17]=[CH:16][C:15]([Cl:18])=[C:14]([C:19]([F:22])([F:21])[F:20])[CH:13]=2)[C:7]([F:23])=[CH:6][C:3]=1[C:4]#[N:5].C(=O)([O-])[O-:25].[K+].[K+].OO.O>CS(C)=O>[F:1][C:2]1[CH:9]=[C:8]([O:10][CH2:11][C:12]2[CH:17]=[CH:16][C:15]([Cl:18])=[C:14]([C:19]([F:20])([F:22])[F:21])[CH:13]=2)[C:7]([F:23])=[CH:6][C:3]=1[C:4]([NH2:5])=[O:25]To a suspension of 2,5-difluoro-4-[4-chloro-3-(trifluoromethyl)phenylmethoxy]-benzonitrile (Preparation 61, 0.2 g, 0.5 mmol) and potassium carbonate (0.39 g, 2.5 mmol) in DMSO (3 mL), was added hydrogen peroxide (30% solution in water, 0.6 mL, 5 mmol) at room temperature. The resulting mixture was stirred for 3 hours at room temperature. Water (30 mL) was then added and the precipitate formed was filtered. The filtrate was extracted twice with EtOAc and combined with the solid. The resulting organic solution was dried over magnesium sulphate, filtered and evaporated to afford the title compound as a white solid (160 mg, 76%).
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