Phosphate → (5R)-5-(2,2-Dimethyl-4H-1,3-benzodioxin-6-yl)-3-{6-[2-{(3-nitrophenyl)-methoxy}ethoxy]hexyl}-1,3-oxazolidin-2-one

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A solution of (5R)-5-(2,2-dimethyl-4H-1,3-benzodioxin-6-yl)-3-[6-(2-hydroxyethoxy)hexyl]-1,3-oxazolidin-2-one (0.20 g) in DMF (5 ml) was treated with sodium hydride (60% dispersion in mineral oil, 0.030 g) and the mixture stirred under nitrogen at 20° C. for 15 min. 3-nitrobenzylbromide (0.111 g) was added, and the mixture stirred at 20° C. for a further 3 h. Phosphate buffer (20 ml, pH6.5) was added and the mixture was stirred for 5 min before extracting with EtOAc (3×20 ml). The organic layer was washed with water (3×20 ml), dried over Na2SO4 and filtered. Solvent evaporation gave the crude product which was purified by flash chromatography on silica. Elution with EtOAc-cyclohexane (7:3) followed by solvent evaporation in vacuo gave the title compound (0.10 g). LCMS RT=3.61 min, ES+ve 529 (MH)+.

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