Hydrochloric Acid → 2-(2,4-difluorophenyl)-3-mercapto-1-(1H-1,2,4-triazol-1-yl)propan-2-ol

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Reaction Steps

To a dimethylformamide (160 ml) solution of 2-(2,4-difluorophenyl)-2-(1H-1,2,4-triazol-1-yl-methyl)oxirane (8.0 g) and methyl ester of 3-mercaptopropionic acid was added, under ice-cooling, 60% sodium hydride (4.0 g). The mixture was stirred for 15 minutes, to which was added dropwise a 1N aqueous solution of hydrochloric acid (101 ml) to adjust the pH to 7, followed by distilling off dimethylformamide and water. To the residue was added water (20 ml), which was extracted with ethyl acetate (50 ml×3). The extract was washed with a saturated aqueous sodium chloride solution, then dried over anhydrous sodium sulfate, followed by distilling off the solvent. The residue was subjected to a silica gel chromatography (6.0×9.0 cm), followed by elution with ethyl acetate-hexane (3:1). The object fraction was concentrated, to which was added diethyl ether to afford 2-(2,4-difluorophenyl)-3-mercapto-1-(1H-1,2,4-triazol-1-yl)propan-2-ol (6.44 g) as colorless needles, m.p. 112°-113° C.

Provenance & Evidence