C(=O)([O-])[O-].[Cs+].[Cs+].[OH:7][CH2:8][CH2:9][C:10]1[CH:15]=[CH:14][C:13]([OH:16])=[CH:12][CH:11]=1.Br[CH2:18][CH:19]([O:23][CH2:24][CH3:25])[O:20][CH2:21][CH3:22].O>CN(C=O)C>[CH3:13][CH2:12][CH2:11][CH:10]([CH3:15])[CH3:9].[CH2:21]([O:20][CH:19]([O:23][CH2:24][CH3:25])[CH2:18][O:16][C:13]1[CH:14]=[CH:15][C:10]([CH2:9][CH2:8][OH:7])=[CH:11][CH:12]=1)[CH3:22]Cesium carbonate (28.3 g) was added to a solution of 4-(2-hydroxyethyl)phenol (10 g) and 2-bromo-1,1-diethoxyethane (11.8 mL) in DMF (150 mL). The resulting suspension was heated at 90° C. for 16 h. The reaction was poured into water (500 mL). The aqueous phase was extracted with ethyl acetate (3×200 mL). The combined organic solutions were washed with water (200 mL) and brine (200 mL), then dried over magnesium sulfate, filtered and evaporated in vacuo. Purification was by silica gel chromatography eluting with isohexane to 1:1 ethyl acetate:isohexane gradient to give the subtitled compound as a yellow oil. Yield 10 g.
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