C(=O)([O-])[O-].[K+].[K+].Br[C:8]1[CH:13]=[CH:12][C:11]([Br:14])=[CH:10][C:9]=1I.[C:16]([O:22][CH3:23])(=[O:21])[CH2:17][C:18]([CH3:20])=[O:19]>C1COCC1.CCOC(C)=O.[Cu]I>[CH3:23][O:22][C:16]([C:17]1[C:9]2[CH:10]=[C:11]([Br:14])[CH:12]=[CH:13][C:8]=2[O:19][C:18]=1[CH3:20])=[O:21]To a stirred mixture of 100 mg (0.525 mmol) copper(I)iodide and 1.90 g (13.7 mmol) potassium carbonate in 10 mL THF was added 1.75 g (4.84 mmol) 1,4-dibromo-2-iodo-benzene and 520 μL methyl acetoacetate under argon atmosphere. Then the mixture was stirred at 100° C. for 5 h under reflux. The reaction mixture was diluted with EtOAc and extracted with water. The combined organic phases were dried over sodium sulfate, filtered and concentrated in vacuo. The crude material was purified by flash chromatography (PE/EtOAc=9/1).
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