Water → 2-(2,2,2-Trifluoroethoxy)ethyl p-toluenesulfonate

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Reaction Steps

To a suspension of LAH (750 mg, 19.7 mmol) in ether (40 ml) was added crude t-butyl-2,2,2-trifluoroethoxyacetate (2.0 g, 9.3 mmol) in ether (10 ml) at 0° C. The mixture was stirred for 45 minutes at 0° C. Then, the mixture was poured into ice-water and extracted with ether. The organic layer was dried over anhydrous magnesium sulfate and concentrated to give crude 2-(2,2,2-trifluoroethoxy)ethanol (1.09 g, 81%). To a solution of crude 2-(2,2,2-trifluoroethoxy)ethanol (150 mg, 11.0 mmol) in dichloromethane (3 ml) was added triethylamine (110 mg, 1.1 mmol) and p-toluenesulfonylchloride (200 mg, 1.1 mmol). The mixture was stirred at room temperature for 2 days. The mixture was poured into water and extracted with chloroform. The organic layer was dried over anhydrous magnesium sulfate. After concentration, silica gel column chromatography (n-hexane/ethyl acetate=5/1) gave 2-(2,2,2-trifluoroethoxy)ethyl p-toluenesulfonate (188 mg, 63%)

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