Ethyl Acetate → 4-Bromo-2-ethoxy-5-methyl-1-[3-(trifluoromethyl)phenyl]-1H-imidazole

Participants

Reaction Steps

A solution of NBS (5.16 g, 29 mmol) in MeCN (60 mL) was added to a stirred solution of 2-ethoxy-5-methyl-1-[3-(trifluoromethyl)phenyl]-1H-imidazole (7.92 g, 29 mmol) in MeCN (115 mL) at such a rate that the internal temperature of the mixture did not exceed 25° C. (a RT cooling bath was used). After 0.5 h the mixture was diluted with water (50 mL) and saturated sodium carbonate (aq) (50 mL). Ethyl acetate (50 mL) was added. The mixture was stirred vigorously then the phases were separated. The organic phase was washed with saturated brine (50 mL), dried (sodium sulfate) and concentrated in vacuo. The residue was taken into dichloromethane and filtered through a 25 g Si II SPE cartridge. The cartridge was washed with DCM and 10% EtOAc in DCM.

Provenance & Evidence