N-bromobutanimide → HCID 178431881, compound

Participants

Reaction Steps

(5-Fluoro-1H-benzimidazol-2-yl)-(4-methylthiophene-3-yl)amine (300 mg) (example 1) was dissolved in glacial acetic acid (50 ml). At room temperature, N-bromosuccinimide (207 mg) dissolved in glacial acetic acid (10 ml), was slowly added dropwise, with vigorous stirring. After the addition had ended, stirring was continued for another 10 min and the glacial acetic acid was then distilled off under reduced pressure, and the residue was dissolved in ethyl acetate and washed with saturated potassium carbonate solution. The organic phase was dried over magnesium sulfate, filtered and concentrated. The residue was purified by preparative chromatography and the product-containing fractions were combined, freed from acetonitrile, made basic and extracted three times with ethyl acetate. The organic phases were combined, dried (MgSO4) and filtered. Following removal of the solvent under reduced pressure, water and 2N hydrochloric acid were added to the residue and the mixture was freeze-dried. This gave 245 mg of the desired product.

Provenance & Evidence