Hydrochloric Acid → (S)-1-(4-Chlorophenyl)propane-1,3-diol

Temperature

20 °C

500 ml of a dimethoxyethane solution of 15.0 g of (2S,3R)-3-(4-chlorophenyl)-2,3-epoxy-1-propanol was cooled to -25° C., and 25.1 ml of a red-Al solution (3.4 mol/l toluene solution) was added dropwise over 0.5 hour. After stirred at 20° C. for 2 hours, the mixture was brought to 0° C. over 1 hour, and 300 ml of diethyl ether was added thereto. While the mixture was kept below 5° C., 100 ml of 2N hydrochloric acid was added dropwise. After stirring for 15 minutes, the mixture was filtered through celite. Then, 100 ml of ethyl acetate was added, and the resulting mixture was allowed to separate. The aqueous layer was extracted again with ethyl acetate. The organic layers were combined, dried over sodium sulfate and filtered through celite. The solvent was distilled off the filtrate, and the resulting residue was purified by silica gel column chromatography (eluent; methanol/chloroform=5/95). It was crystallized to obtain 14.56 g of the title compound as white crystals.

1. waitthe mixture was brought to 0° C. over 1 hour
2. customwas kept below 5° C.
3. stirringAfter stirring for 15 minutes
4. filtrationthe mixture was filtered through celite
5. additionThen, 100 ml of ethyl acetate was added
6. customto separate
7. extractionThe aqueous layer was extracted again with ethyl acetate
8. dry with materialdried over sodium sulfate
9. filtrationfiltered through celite
10. distillationThe solvent was distilled off the filtrate
11. customthe resulting residue was purified by silica gel column chromatography (eluent; methanol/chloroform=5/95)
12. customIt was crystallized

ORD record

ord-b0414e452bad4022bac15da398f5cf6b

Source dataset

uspto-grants-1998_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05750523