was added in portions to the reaction mixture over a period of 5 minutes and the resulting solution was stirred overnight at room temperature. After completion of the reaction (monitored by TLC), the mixture was quenched with a 1N HCl and extracted with CH2Cl2 (2 x 5 mL). The combined organic layers were then washed with water (2 x 10 ml), dried over anhydrous MgSO4, concentrated under vacuum and the crude mixture was further purified by flash column chromatography Isolated yield: 72% (263.7 mg, white solid).