To a solution of (S)-4-hydroxymethyl-4-[2-(4-hydroxy-phenyl)-ethyl]-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester (100 mg, 0.28 mmol) in DMF (5 ml) is added CsCO3 (120.5 mg, 0.37 mmol, 1.3 eq) and 1-(2-bromo-ethoxy)-3-fluoro-benzene (80.7 mg, 0.37 mmol, 1.3 eq). The reaction mixture is stirred at 85° C. for 4 hours. Ethyl acetate and water are then added, the organic layer is separated and the aqueous phase is extracted with ethylacetate (3×50 ml). The combined organic extracts are washed with brine, dried over MgSO4, and evaporated to dryness. Purification by flash chromatography (AcOEt/Hx 9:1) affords (S)-4-(2-{4-[2-(3-fluoro-phenoxy)-ethoxy]-phenyl}-ethyl)-4-hydroxymethyl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester as colorless oil.
