[NH2:1][C:2]1[C:7]([F:8])=[CH:6][C:5]([OH:9])=[CH:4][C:3]=1[F:10].N1C=CN=C1.[Cl-].[CH:17]([SiH:20]([CH:24]([CH3:26])[CH3:25])[CH:21]([CH3:23])[CH3:22])([CH3:19])[CH3:18]>CN(C=O)C>[F:8][C:7]1[CH:6]=[C:5]([O:9][Si:20]([CH:24]([CH3:26])[CH3:25])([CH:21]([CH3:23])[CH3:22])[CH:17]([CH3:19])[CH3:18])[CH:4]=[C:3]([F:10])[C:2]=1[NH2:1]A mixture of 4-amino-3,5-difluorophenol (580 mg), imidazole (354 mg), triisopropylsilane chloride (848 mg) and DMF (12 mL) was stirred at room temperature overnight. The solvent was evaporated under reduced pressure, water was added to the residue, and the mixture was extracted with ethyl acetate. The separated aqueous layer was extracted again with ethyl acetate. The combined organic layer was washed with saturated brine, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give the title compound as a pale-brown oil (1.0 g).
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