Br[C:2]1[CH:3]=[CH:4][C:5]([F:10])=[C:6]([CH:9]=1)[CH:7]=[O:8].[CH2:11]([O:13][C:14]1[CH:19]=[CH:18][C:17](OB(O)O)=[CH:16][CH:15]=1)[CH3:12].C(=O)([O-])[O-].[Na+].[Na+].C1(C)C=CC=CC=1>COCCOC>[CH2:11]([O:13][C:14]1[CH:19]=[CH:18][C:17]([C:2]2[CH:3]=[CH:4][C:5]([F:10])=[C:6]([CH:9]=2)[CH:7]=[O:8])=[CH:16][CH:15]=1)[CH3:12]
Under an argon atmosphere, tetrakistriphenylphosphine palladium (69 mg) was added to 5 ml of 1,2-dimethoxyethane. A mixture resulting from dissolving 5-bromo-2-fluorobenzaldehyde (406 mg) in 5 ml of 1,2-dimethoxyethane was added. A mixture resulting from dissolving 4-ethoxyphenylboric acid (398 mg) in 1.5 ml of 1,2-dimethoxyethane was added. Two milliliter of 2M sodium carbonate solution was added. Stirring was conducted for one hour and ten minutes under reflux. After cooling to room temperature, 20 ml of toluene was added and was washed with 10 ml of water twice, 10 ml of a 2N sodium hydroxide solution twice and 10 ml of water twice. After drying with anhydrous sodium sulfate, the mixture was concentrated. The concentrated matter was purified by silica gel chromatography (hexane/ethyl acetate=4/1). The resulting effective fractions were concentrated to yield 5-(4-ethoxyphenyl)-2-fluorobenzaldehyde (369 mg, Yield 76%).
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