[C:1]1([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH:6]=[CH:5][C:4]([C:7]2[CH:11]=[CH:10][O:9][CH:8]=2)=[CH:3][CH:2]=1.[C:18]([O-:21])([O-:20])=O.[Na+].[Na+].BrBr.[CH:26]1C=CC=CC=1>CO.CCOC(C)=O>[C:1]1([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH:6]=[CH:5][C:4]([C:7]2[CH:8]([O:9][CH3:10])[O:20][CH:18]([O:21][CH3:26])[CH:11]=2)=[CH:3][CH:2]=1
To a slurry of 3-(biphenyl-4-yl)furan (100 mg, 0.450 mmol) and Na2CO3 (48 mg, 0.45 mmol) in benzene (1 mL) and MeOH (1 mL) at −10° C. was added bromine (22 μL, 0.43 mmol) dropwise via syringe. After 30 minutes at −10° C., the mixture was diluted with EtOAc and filtered twice. The filtrate was concentrated to give a crude solid which was purified via flash column chromatography with a 0-1% EtOAc/CH2Cl2 gradient eluant to provide 90 mg (74%) of a diasteromeric mixture of 3-(biphenyl-4-yl)-2,5-dihydro-2,5-dimethoxyfuran as a colorless oil.
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