Br[C:2]1[C:3]([CH3:14])=[CH:4][C:5]([O:12][CH3:13])=[C:6]([CH:11]=1)[C:7]([O:9][CH3:10])=[O:8].[F:15][C:16]([F:21])([F:20])C([O-])=O.[K+].C1(C)C=CC=CC=1>CN(C)C=O.[Cu]I>[CH3:14][C:3]1[C:2]([C:16]([F:21])([F:20])[F:15])=[CH:11][C:6]([C:7]([O:9][CH3:10])=[O:8])=[C:5]([O:12][CH3:13])[CH:4]=1
To a mixture of methyl 5-bromo-4-methyl-2-(methyloxy)benzoate (may be prepared as described in Description 43; 2.5 g, 9.65 mmol) in N,N-dimethylformamide (40 ml) was added copper (I) iodide (4.04 g, 21.23 mmol) and potassium trifluoroacetate (2.94 g, 19.30 mmol). Toluene (10 ml) was added and the mixture heated in Dean Stark apparatus at 170° C. for 45 minutes. The toluene was removed via the Dean Stark trap and the resulting mixture was heated for 18 hours at 170° C. The mixture was diluted with water (10 ml) and ethyl acetate (20 ml) and the solid was removed using Celite. The filtrate was taken and the organic layer separated, dried (MgSO4) and the solvent removed in vacuo. The residue was purified by column chromatography (SiO2, 50% Cyclohexane/diethyl ether) to yield the title compound as a white solid. 1.76 g.
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