[CH2:1]([OH:4])[CH2:2][OH:3].[H-].[Na+].[Si:7](Cl)([C:10]([CH3:13])([CH3:12])[CH3:11])([CH3:9])[CH3:8].P([O-])([O-])([O-])=O>C1COCC1>[Si:7]([O:3][CH2:2][CH2:1][OH:4])([C:10]([CH3:13])([CH3:12])[CH3:11])([CH3:9])[CH3:8]Ethylene glycol (2.00 g) in anhydrous THF (60 ml) under nitrogen was treated portionwise with sodium hydride (60% dispersion in mineral oil, 1.29 g) and the mixture stirred at 20° C. for 45 min. Tert-butyl dimethylsilyl chloride (4.86 g) was added and the mixture stirred at 20° C. for 45 min. Phosphate buffer (60 ml, pH6.5) was added and the mixture stirred for 20 min before extracting with ether (60 ml). The organic layer was then washed with water (60 ml) and brine (60 ml), before drying over Na2SO4, filtering, and removing the solvent in vacuo. This was purified by flash chromatography on silica. Elution with 1:4 EtOAc/cyclohexane followed by solvent evaporation in vacuo gave the title compound (3.82 g). TSP+ve 194 MNH4+.
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