Hydrochloric Acid → (2S,3R)-3-(2,4-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butyronitrile

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To a solution with 5 g (20.0 mmol) of optically active (2R,3S)-2-(2,4-difluorophenyl)-3-methyl-2-(1H-1,2,4-triazol-1-yl)methyloxirane dissolved in 40 ml of toluene, were added 80 ml of diethylaluminum cyanide (1.0M toluene solution) in a nitrogen atmosphere. The mixture was heated at 50° C. for 12 hours, and 10 ml of water and 120 ml of 1N HCl were successively added dropwise thereto. The resulting mixture was stirred for 2 hours at room temperature, filtered through a Florisil pad and then subjected to extraction with ethyl acetate. The resultant organic layer was washed 4 times with a liquid obtained by mixing water and saturated saline at a ratio of 1:1, and finally with saturated saline. After the solvent was distilled out under reduced pressure, the residue was washed with diisopropyl ether, thereby obtaining 3.15 g (56.6%) of optically active (2S,3R)-3-(2,4-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butyronitrile. Physical properties of this product are described below.

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