[CH3:1][C:2]([C:6]1[CH:7]=[C:8]([CH:12]=[CH:13][CH:14]=1)[C:9]([OH:11])=[O:10])([CH3:5])[CH:3]=[O:4].[C:15](=O)([O-])[O-].[K+].[K+].CI>CC(C)=O>[CH3:5][C:2]([C:6]1[CH:7]=[C:8]([CH:12]=[CH:13][CH:14]=1)[C:9]([O:11][CH3:15])=[O:10])([CH3:1])[CH:3]=[O:4]To a solution of 3-(l,l-dimethyl-2-oxoethyl)benzoic acid in acetone (60 mL) were added potassium carbonate (3.78 g, 27.3 mmol) and methyl iodide (3.40 mL, 54.6 mmol), and the mixture was stirred at 60° C. for 5 hr. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. To the obtained residue was added saturated aqueous sodium hydrogen carbonate solution (50 mL), and the mixture was extracted with ethyl acetate (100 mL, 30 mL). The combined organic layer was washed with saturated brine (20 mL), and dried over anhydrous magnesium sulfate. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure to give methyl 3-(1,1-dimethyl-2-oxoethyl)benzoate as a yellow oil.
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