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温度

0 °C

((2R,3R)-3-(4-Chloro-3-fluorophenyl)oxiran-2-yl)methanol (10.55 g, 52.07 mmol) was dissolved in 1,2-dimethoxyethane (150 mL) and cooled to 0° C. Sodium bis(2-methohyethoxy) aluminum hydride (“Red-Al”) (17.46 mL, 57.28 mmol) was added dropwise. The mixture was agitated for 3 hours at room temperature, diluted with ether (250 mL) and quenched with HCl solution (20 mL, 6M HCl+60 mL water). After agitating for 30 minutes, the aqueous phase was separated and extracted twice with ethyl acetate. The combined organics were washed with brine, dried with MgSO4, and evaporated to give (S)-1-(4-chloro-3-fluorophenyl)propane-1,3-diol (10.5 g, 51.31 mmol, 98.55% yield) as thick oil.

1. customquenched with HCl solution (20 mL, 6M HCl+60 mL water)
2. stirringAfter agitating for 30 minutes
3. customthe aqueous phase was separated
4. extractionextracted twice with ethyl acetate
5. washThe combined organics were washed with brine
6. dry with materialdried with MgSO4
7. customevaporated