[OH:1][C:2]1[CH:14]=[CH:13][C:5]2[C:6](=[O:12])[O:7][C:8]([CH3:11])([CH3:10])[O:9][C:4]=2[CH:3]=1.[F:15][C:16]1[CH:17]=[C:18]([CH:21]=[CH:22][C:23]=1F)[CH:19]=[O:20].C(=O)([O-])[O-].[K+].[K+].O>CN(C)C=O>[CH3:11][C:8]1([CH3:10])[O:7][C:6](=[O:12])[C:5]2[CH:13]=[CH:14][C:2]([O:1][C:23]3[CH:22]=[CH:21][C:18]([CH:19]=[O:20])=[CH:17][C:16]=3[F:15])=[CH:3][C:4]=2[O:9]17-Hydroxy-2,2-dimethyl-benzo[1,3]dioxin-4-one (I-1a: 12.9 g), 3,4-difluorobenzaldehyde (9.45 g) and potassium carbonate (27.6 g) were combined in dimethylformamide (100 mL) and stirred as the reaction mixture was heated to 80° C. After 24 hours, the reaction mixture was cooled to ambient temperature, combined with water, and extracted with ethyl acetate. The combined organic phases were dried over magnesium sulfate, filtered, and evaporated. The residue was purified by column chromatography on silica gel eluting with 10-15% ethyl acetate in heptane to give the title compound (I-1b-1).
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