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0 °C

(S)-1-(4-Chloro-3-fluorophenyl)propane-1,3-diol (10.5 g, 51.3 mmol) was dissolved in dichloromethane (200 mL), and imidazole (8.73 g, 128 mmol) was added. The mixture was then cooled to 0° C., and tert-butyldimethylsilyl chloride (9.67 g, 64.1 mmol) was added. The mixture was agitated for 1 hour, diluted with dichloromethane to 250 mL and washed with water, sodium bicarbonate solution, dried and evaporated. Purified by chromatography on silica gel, eluted with 5-10% ethyl acetate/hexanes to give (S)-3-(tert-butyldimethylsilyloxy)-1-(4-chloro-3-fluorophenyl)propan-1-ol (8.40 g, 26.3 mmol, 51.3% yield) as an oil.

1. washwashed with water, sodium bicarbonate solution
2. customdried
3. customevaporated
4. customPurified by chromatography on silica gel
5. washeluted with 5-10% ethyl acetate/hexanes