After stirring at 0 °C for 30 minutes, the reaction mixture was diluted with sat. aq. NH4Cl (5 mL). The reaction mixture was diluted with Et2O (5 mL) and the organic phase was separated. The aqueous phase was extracted with Et2O (2 x 5 mL) and the combined organic extracts were washed with brine (15 mL), dried with Na2SO4, filtered, and concentrated under reduced pressure by rotary evaporation. Purification by flash column chromatography on silica gel (5% Et2O/hexanes) afforded 6-6 (174.5 mg, 87%) as a colorless oil and a 1.4:1 mixture of diastereomers.