反应详情

Molecular sieve 4A (3 g) was added to a mixture of 4-formyl-4′-(2,2,3,3-tetrafluoropropoxy)benzanilide (300 mg, 0.84 mmol) obtained in example 1 (1), (2R,3R)-2-(2,4-difluorophenyl)-3-[[1-(hydroxymethyl)-2-hydroxyethyl]thio]-1-(1H-1,2,4-triazol-1-yl)-2-butanol (disclosed in Japanese Patent Application Publication No. Hei-8-333350; 253 mg, 0.70 mmol), p-toluenesulfonic acid monohydrate (160 mg, 0.84 mmol) in anhydrous tetrahydrofuran (10 ml) and anhydrous dichloromethane (5 ml). The resulting mixture was stirred at room temperature for two days. Aqueous sodium hydrogencarbonate solution was added to the reaction mixture at 0° C., and the mixture was filtered to remove the molecular sieve. The filtrate was partitioned between ethyl acetate and water. The organic layer was washed with saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The resulting oily residue was chromatographed on a silica gel column using ethyl acetate-hexane (2:1) as the eluant to afford the trans isomer of the title compound (87 mg, yield 18%) as a white solid and then using ethyl acetate-hexane (4:1) as the eluant to give the cis isomer (55 mg, yield 11%) as a colorless oil. The trans isomer was recrystallized from ethyl acetate-isopropyl ether to give white powdery crystals.

1. filtrationthe mixture was filtered
2. customto remove the molecular sieve
3. customThe filtrate was partitioned between ethyl acetate and water
4. washThe organic layer was washed with saturated aqueous sodium chloride solution
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe resulting oily residue was chromatographed on a silica gel column