Chloroform → 4-(2,4-dichlorophenyl)-5-(4-fluorophenyl)-2-oxo-4-(1H-1,2,4-triazol-1-yl)methyl-1,3-dioxolane

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Reaction Steps

A mixture of 500 mg of 2-(2,4-dichlorophenyl)-1-(4-fluorophenyl)-3-(1H-1,2,4-triazol-1-yl)-1,2-propanediol, 530 mg of 1,1'-carbonyldiimidazole and 10 ml of dry chloroform is heated under reflux for 1 hour. Water is added to the reaction mixture, and the chloroform layer is separated, dried over anhydrous sodium sulfate, and concentrated. The residue is chromatographed on a column of silica-gel and eluted with a mixture of methylene chloride and methanol (100:0-98:2 v/v). The eluate is concentrated, and the residue is crystallized from ethyl acetate-isopropyl ether to give 420 mg of 4-(2,4-dichlorophenyl)-5-(4-fluorophenyl)-2-oxo-4-(1H-1,2,4-triazol-1-yl)methyl-1,3-dioxolane as crystals. m.p. 191°-192° C. Yield: 78.7%

Provenance & Evidence