[Br:1][C:2]1[C:7]([CH3:8])=[CH:6][C:5]([OH:9])=[CH:4][C:3]=1[CH3:10].C([O-])([O-])=O.[K+].[K+].Br[CH2:18][CH:19]1[CH2:23][CH2:22][O:21][CH2:20]1>CN(C)C=O>[Br:1][C:2]1[C:7]([CH3:8])=[CH:6][C:5]([O:9][CH2:18][CH:19]2[CH2:23][CH2:22][O:21][CH2:20]2)=[CH:4][C:3]=1[CH3:10]To a solution of 4-bromo-3,5-dimethylphenol (1.5 g) and K2CO3 (3.2 g) in N,N-dimethylformamide (12 mL) is added 3-(bromomethyl)tetrahydrofuran (3.6 g). The mixture is stirred for 16 hours at 80° C. and then partitioned between water and ethyl acetate. The organic phase is washed with brine and dried (MgSO4). The solvent is evaporated and the residue is chromatographed on silica gel (cyclohexane/ethyl acetate 99:1→70:30) to give the title compound. Yield: 1.72 g; LC (method 1): tR=1.37 min; Mass spectrum (ESI+): m/z=285 [M+H]+.
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