Phosphate → (5R)-3-[6-(2-([tert-butyl(dimethyl)silyl]oxy}ethoxy)hexyl]-5-(2,2-dimethyl-4H-1,3-benzodioxin-6-yl)-1,3-oxazolidin-2-one

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A solution of (5R)-5-(2,2-dimethyl-4H-1,3-benzodioxin-6-yl)-1,3-oxazolidin-2-one (0.83 g) in DMF (20 ml) was treated with sodium hydride (60% dispersion in mineral oil, 0.20 g) and the mixture stirred under nitrogen at 20° C. for 30 min. A solution of {2-[(6-bromohexyl)oxy]ethoxy}tert-butyl)dimethylsilane (1.47 g) in DMF (4 ml) was added and the mixture stirred at 20° C. for 90 min. Phosphate buffer (20 ml, pH6.5) was added, before partitioning between EtOAc (50 ml) and water (50 ml). The layers were separated and the aqueous layer re-extracted with EtOAc (3×30 ml). The combined organic layer was washed with water (3×50 ml) and dried over Na2SO4 before filtering. Solvent evaporation in vacuo gave a residue which was purified by flash chromatography on silica. Elution with EtOAc-cyclohexane (1:1) followed by solvent evaporation in vacuo gave the title compound (0.84 g). LCMS RT=4.11 min, ES+ve 507 (MH)+.

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