Dimethylformamide → 2-[(1R,2R)-2-(2,4-difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]-4-[4-[2-oxo-3-[4-(2,2,3,3-tetrafluoropropoxy)-phenyl]-1H,3H-imidazol-1-yl]phenyl]-3(2H,4H)-1,2,4-triazolone

Participants

Reaction Conditions

Reaction Steps

(2R,3S)-2-(2,4-Difluorophenyl)-3-methyl-2-(1H-1,2,4-triazol-1-yl)methyloxirane (1.2 g), 4-[4-[2-oxo-3-[4-(2,2,3,3-tetrafluoropropoxy)phenyl]-1H,3H-imidazol-1-yl]phenyl]-3(2H,4H)-1,2,4-triazolone (2.2 g) and potassium carbonate (powder: 3.5 g) were added to N,N-dimethylformamide (50 ml), and the mixture was heated with stirring at 90° C. for 42 hours. After cooling, the resultant was diluted with ethyl acetate (150 ml) and tetrahydrofuran (50 ml). Ice water (150 ml) was added thereto to separate the ethyl acetate layer. The aqueous layer was extracted with ethyl acetate (100 ml). The ethyl acetate layers were combined and washed with 0.5N-sodium hydroxide (100 ml), 1N-hydrochloric acid (100 ml) and a saturated aqueous solution of sodium chloride (100 ml) successively. The ethyl acetate layer was dried over anhydrous magnesium sulfate and distilled under reduced pressure to remove the solvent. The residue was purified by silica gel chromatography (elute:ethyl acetate/acetone=10/1) and crystallized from tetrahydrofuran-diisopropyl ether to give 2-[(1R,2R)-2-(2,4-difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]-4-[4-[2-oxo-3-[4-(2,2,3,3-tetrafluoropropoxy)-phenyl]-1H,3H-imidazol-1-yl]phenyl]-3(2H,4H)-1,2,4-triazolone (Compound 2; 0.26 g) as a colorless crystalline powder.

Provenance & Evidence