[F:1][C:2]1[C:10]([N+:11]([O-:13])=[O:12])=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]([CH3:16])([CH3:15])[C:5](=[O:14])[NH:6]2.FC(F)(F)S(O[CH2:23][C:24]([F:27])([F:26])[F:25])(=O)=O.C(=O)([O-])[O-].[K+].[K+].CN(C=O)C>O>[F:1][C:2]1[C:10]([N+:11]([O-:13])=[O:12])=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]([CH3:16])([CH3:15])[C:5](=[O:14])[N:6]2[CH2:23][C:24]([F:27])([F:26])[F:25]A suspension of 4-fluoro-3,3-dimethyl-5-nitro-1,3-dihydro-2H-indol-2-one (0.10 g), 2,2,2-trifluoroethyl trifluoromethanesulfonate (0.16 g), potassium carbonate (0.12 g) and DMF (2 mL) was stirred at room temperature for 1 hr. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (2.2 g).
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