Hydrochloric Acid → (1R)-1-[(2R)-2-(2,4-difluorophenyl)-2-oxiranyl]ethanol

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Reaction Steps

[(1R)-1-[(2R)-2-(2,4-Difluorophenyl)-2-oxiranyl]ethyl] 3,5-dinitrobenzoate (50 g) was dissolved in methanol (2 lit.), to which 1N-sodium hydroxide (255 ml) was added dropwise at room temperature. The mixture was stirred at room temperature for 1 hour and neutralized by an addition of 1 N-hydrochloric acid (127 ml) thereto. The resultant was concentrated under reduced pressure, to which ethyl acetate (1 lit.) and water (200 ml) were added. The mixture was extracted with ethyl acetate. The organic layer was washed with a saturated aqueous solution of sodium chloride (200 ml), dried over magnesium sulfate and distilled under reduced pressure to remove the solvent. The residue was purified by silica gel chromatography (eluent:ethyl acetate/hexane=1/3) to give (1R)-1-[(2R)-2-(2,4-difluorophenyl)-2-oxiranyl]ethanol (25 g) as a pale yellow oily substance.

Provenance & Evidence