反应详情

To a solution of 1.4 g (3.7 mmol) of methyl-4-[(E)-2-(5,5,8,8-tetramethyl-3-methyl-6-oxo-5,6,7,8-tetrahydro-naphthalen-2-yl)vinyl]-benzoic acid and 0.86 g (4.8 mmol) of N-bromosuccinimide in 50 ml carbon tetrachloride was added 45 mg (0.19 mmol) of benzoyl peroxide and the reaction was heated to reflux temperature. After 1 h, added additional 45 mg of benzoyl peroxide and 25 ml carbon tetrachloride. After 3 h total added 0.2 g N-bromosuccinimide. After 6 h total, cooled to room temperature, washed with 10% aqueous sodium bisulfite and brine, dried over sodium sulfate and adsorbed onto silica gel. Purified by flash chromatography (hexane-8% ethyl acetate/hexane) to give 1.0 g (59%) of methyl-4-[(E)-2-(5,5,8,8-tetramethyl-3-bromomethyl-6-oxo -5,6,7,8-tetrahydro-naphthalen-2-yl)vinyl]-benzoic acid.

1. temperaturethe reaction was heated
2. temperatureto reflux temperature
3. waitAfter 6 h total
4. washwashed with 10% aqueous sodium bisulfite and brine
5. dry with materialdried over sodium sulfate
6. customPurified by flash chromatography (hexane-8% ethyl acetate/hexane)