Water → (3R)-2-(2,4-difluorophenyl)-3-(3,4,5,6-tetrahydro-2H-pyran-2-yl)oxy-1-(1H-1,2,4-triazol-1-yl)-2-butanol

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Reaction Steps

In dimethylformamide (50 ml) was dispersed 60% sodium hydride (2.64 g) in mineral oil, to which was added, under ice-cooling, triazole (6.84 g), and the mixture was stirred for 15 minutes. To the mixture was added a dimethylformamide solution (10 ml) of 2-[(1R)-1-(3,4,5,6-tetrahydro-2H-pyran-2-yloxy)ethyl]-2-(2,4-difluorophenyl)oxirane (4.7 g). The resultant mixture was heated for 3 hours at 80° C. The reaction mixture was cooled, which was then poured into cold water (200 ml), followed by extraction with ethyl acetate (150 ml) three times. Ethyl acetate layers were combined, washed with water (100 ml×3) and a saturated aqueous solution (100 ml) of sodium chloride successively, and dried over anhydrous sodium sulfate, followed by distilling off the solvent. The residue was purified by means of a silica gel chromatography (eluent: dichloromethane-ethyl acetate-acetone=6:1:1) to afford (3R)-2-(2,4-difluorophenyl)-3-(3,4,5,6-tetrahydro-2H-pyran-2-yloxy)-1-(1H- 1,2,4-triazol-1-yl)-2-butanol (4.4 g) as a colorless viscous oil.

Provenance & Evidence