After stirring at room temperature for 30 minutes, sat. aq. NaHCO3 (10 mL) was added dropwise to the reaction mixture and the layers were separated. The aqueous layer was extracted with CH2Cl2 (3 x 15 mL). The combined organic extracts were washed with brine (15 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure by rotary evaporation to give a yellow viscous oil. Purification by flash column chromatography on silica gel (hexanes/EtOAc 4:1) afforded SI-3 (680 mg, 48% over two steps) as a yellow solid.