1H-1,2,4-Triazole → 3,3-Dimethyl-2-{2-[4-(1,3-dioxolan-2-yl)-phenyl]-ethenyl}-1-(1,2,4-triazol-1-yl)-2-butanol

Participants

Reaction Conditions

Reaction Steps

25.6 g (0.093 mol) of 2-{2-[4-(1,3-dioxolan-2-yl)-phenyl]-ethenyl}-2-tert.-butyl-oxirane in 47 ml of absolute dimethylformamide are added dropwise, at room temperature, to a solution of sodium triazolide, prepared by slowly introducing 12.9 g (0.187 mol) of 1,2,4-triazole into a suspension of 5.6 g (0.187 mol) of sodium hydride (80% strength in paraffin oil) in 187 ml of absolute dimethylformamide. The reaction mixture is stirred at 80° C. for 4 hours and left to stand overnight at room temperature. Thereafter, the reaction mixture is poured onto ice water and extracted several times with ethyl acetate. The combined ethyl acetate phases are washed twice with water and once with saturated sodium chloride solution, dried over sodium sulphate and concentrated. The residue is chromatographed over a silica gel column (methylene chloride/ethyl acetate=2:1) and the product is recrystallized from n-hexane/ethyl acetate. 7.75 g (24% of theory) of 3,3-dimethyl-2-{2-[4-(1,3-dioxolan-2-yl)-phenyl]-ethenyl}-1-(1,2,4-triazol-1-yl)-2-butanol of melting point 109.5°-110° C. are obtained.

Provenance & Evidence