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CH2C12 (4 mL) was cooled to -78 °C, and DMSO (0.30 mL, 4.4 mmol) in CH2C12 (1 mL) was added slowly. The mixture was stirred at -78 °C for 2 min, and a solution of the alcohol (0.53 g, 1.8 mmol) in CH2C12 (5 mL) was added rapidly. The resulting mixture was stirred at -78 °C for 30 min, and triethylamine (1.4 mL, 1.0 g 10 mmol) was added. The mixture was stirred at -78 °C for 5 min and brought to 20 °C. Water (10 mL) was added, and the aqueous phase was extracted with CH2C12 (10 mL). The organic phases were dried (Na2S04) and concentrated to give 0.64 g of an oil, which was purified by flash chromatography23 (CH2C12, 10% EtOAc) to afford 0.47 g (89%) of 10: mp 102-103 °C; IR (CHC13 cast) 1775 cm"1;

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