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To a solution of cis and trans-5-t-butyldimethylsilyloxymethyl-2-(diethyloxyphosphinoyl)-1,3-oxathiolane (example 25) (4.00 g, 10.8 mmol) in MeOH (30 mL) was added a few drops of acetyl chloride (200 μL) at 0° C. The mixture was stirred at 0° C. for 1 hr. and at room temperature for 18 hr. A few drops of ammonium chloride was added and the solvent was evaporated under reduced pressure. The crude material was purified by several flash chromatography with a mixture of dichloromethane and methanol (96:4) to give 382 mg of the cis isomer, 1.19 g of the trans isomer and 332 mg of the mixture in a total yield of 80% after the first purification. ##STR52##

1. waitand at room temperature for 18 hr
2. customthe solvent was evaporated under reduced pressure
3. customThe crude material was purified by several flash chromatography with a mixture of dichloromethane and methanol (96:4)