Benzoyl Peroxide → 4-Bromo-3-(4-fluoro-phenyl)-7-hydroxy-thieno[3,2-c]pyridine-6-carboxylic acid methyl ester

Participants

Reaction Steps

A suspension of 3-(4-fluoro-phenyl)-7-hydroxy-thieno[3,2-c]pyridine-6-carboxylic acid methyl ester (100 mg, 0.33 mmol), example 31-f, N-bromosuccinimide (61.6 mg, 0.346 mmol), and benzoyl peroxide (8.0 mg, 0.033 mmol) in 0.83 mL of carbon tetrachloride was heated at reflux temperature for 5 hours. The reaction mixture was washed successively with saturated sodium bicarbonate, brine, saturated ammonium chloride solution, and brine. The organic solution was dried, filtered, and concentrated. The crude product was purified by flash chromatography eluting from silica gel with a gradient of 0-50% ethyl acetate in methylene chloride to produce 77.9 mg of a light yellow solid. MS: (−) m/z 380.3, 382.1 (M−1, 79Br/81Br).

Provenance & Evidence