Br[C:2]1[CH:7]=[C:6]([Cl:8])[C:5]([CH3:9])=[CH:4][C:3]=1[F:10].C([Mg]Cl)(C)C.[C:16](=[O:18])=[O:17]>C1COCC1>[Cl:8][C:6]1[C:5]([CH3:9])=[CH:4][C:3]([F:10])=[C:2]([CH:7]=1)[C:16]([OH:18])=[O:17]To a solution of 1-bromo-5-chloro-2-fluoro-4-methylbenzene (11.3 g, 50 mmol) in dry THF (100 mL) was added isopropylmagnesium chloride (30 mL, 2 M) dropwise. After stirring at room temperature for 30 min, dry CO2 was added and the mixture was stirred at room temperature for additional 30 min. The reaction was quenched by sat. NH4Cl and extracted with EtOAc (100 mL×3). The combined organic layers were washed with water (50 mL×3), dried over anhydrous Na2SO4, filtered and concentrated to give the desired product (4.7 g, 49%). LCMS (ESI) m/z: 187.0 [M−H]−.
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