Allyl bromide → Ethyl 2-[2-methyl-4-(trifluoromethyl)-5-vinyl-imidazol-1-yl]pent-4-enoate

Participants

Reaction Conditions

Reaction Steps

To a cooled (−78° C.) solution of ethyl 2-[2-methyl-4-(trifluoromethyl)-5-vinyl-imidazol-1-yl]acetate (790 mg, 3.01 mmol) in THF (6 mL) under nitrogen atmosphere was added LDA (2 M, 3 mL, 6.03 mmol) drop wise. After stirring the reaction mixture at −78° C. for 15 min, allyl bromide (521 μL, 6.03 mmol) was added slowly and the reaction mixture was allowed to warm to room temperature and stirred for 2 h. A saturated NH4Cl solution (20 mL) was added to the reaction mixture at 0° C. and the mixture was then extracted with EtOAc (2×100 mL). The combined EtOAc layers were then washed with brine (50 mL), dried (MgSO4), concentrated in vacuo, and purified by flash chromatography (SiO2, 80% EtOAc/hexanes) to obtain ethyl 2-[2-methyl-4-(trifluoromethyl)-5-vinyl-imidazol-1-yl]pent-4-enoate (127 mg, 0.42 mmol, 14% yield).

Provenance & Evidence