Dimethylformamide → 1-[(1R,2R)-2-(2,4-Difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]-3-[4-(1H-1,2,4-triazol-1-yl)phenyl]-2(1H,3H)-imidazolone

Participants

Reaction Conditions

Reaction Steps

(2R,3S)-2-(2,4-Difluorophenyl)-3-methyl-2-(1H-1,2,4-triazol-1-yl)methyloxirane (2.5 g), 1-[4-(1H-1,2,4-triazol-1-yl)phenyl]-2(1H,3H)-imidazolone (2.72 g) and cesium carbonate (powder: 9.7 g) were added to N,N-dimethylformamide (150 ml), and the mixture was heated at 80° C. with stirring for 9.5 hours. After cooling, the reaction mixture was diluted with ethyl acetate (400 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×2) and a saturated aqueous solution of sodium chloride (50 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 (eluent: ethyl acetate/acetone=2/1) to give 1-[((1R,2R)-2-(2,4-difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]-3-[4-(1H-1,2,4-triazol-1-yl)phenyl]-2(1H,3H)-imidazolone (Compound 9; 1.03 g) as a pale yellow powder.

Provenance & Evidence