Phenol → 2-Bromoimidazo[5,1-b]thiazole

Participants

Reaction Conditions

Reaction Steps

A solution of 2-bromoimidazo[5,1-b]thiazole-7-carboxylic acid (31 mg, 0.12 mmol) and phenol (12 mg, 0.12 mmol) dissolved in 1,2,4-trichlorobenzene (1 ml) was stirred at 180° C. for 24 hr. The reaction solution was allowed to cool to room temperature, was diluted with hexane, and was extracted with 1 M hydrochloric acid (3 ml×3). The aqueous layer was neutralized with a 2 M aqueous solution of sodium hydroxide and was extracted with ethyl acetate (5 ml×3). The organic layer was washed with saturated brine and was dried over anhydrous sodium sulfate. The solvent was removed by distillation under the reduced pressure. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=1:1) to give 2-bromoimidazo[5,1-b]thiazole (13 mg, 50%) as a white solid.

Provenance & Evidence