Water → 2-Methyl-propane-2-sulfinic acid [1-benzyl-4-(2-phenyl-chroman-6-yloxy)-cyclohexyl]-amide

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To a solution of 352 mg of 4-(2-phenyl-chroman-6-yloxy)-cyclohexanone (1.1 mmol) in 10 ml of tetrahydrofuran at room temperature 0.46 ml of titanium(IV) ethoxide (2.18 mmol) and 139 mg of tert-butylsulfinamide (1.15 mmol) were added and the resulting solution heated to reflux for 16 h. The solution was cooled to 0° C. and 1.09 ml of benzylmagnesium chloride (2M in tetrahydrofuran, 2.18 mmol) were added. The mixture was stirred at room temperature for 16 h and additional 1.09 ml of benzylmagnesium chloride solution were added. After additional 16 h of stirring the reaction was stopped by careful addition of water. The suspension was filtered and the filter cake washed with dichloromethane. The aqueous layer was extracted with dichloromethane. The combined organic layers were dried over sodium sulfate and filtered, and the solvent removed by evaporation. The resulting oil was purified by chromatography over silica gel using a heptane/ethyl acetate gradient (0% ethyl acetate to 25% ethyl acetate). 248 mg of 2-methyl-propane-2-sulfinic acid [1-benzyl-4-(2-phenyl-chroman-6-yloxy)-cyclohexyl]-amide were isolated as a mixture of diastereomers (44%).

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