反应详情

With no precautions to maintain a dry atmosphere, methyl 5-fluoro-2-methylbenzoate (Maybridge, 5 g, 29.7 mmole) was dissolved in CCl4 (50 mL). N-bromosuccinimide (5.82 g, 32.7 mmol) and benzoyl peroxide (0.36 g, 1.48 mmole) were added and the reaction brought to reflux overnight. An additional 0.3 eq of NBS and 0.01 eq of benzoyl peroxide was added and the reaction refluxed for 4 hrs, then cooled, filtered and concentrated. The residue was chromatographed on silica eluting with a gradient of 0-10% EtOAc/Hexanes. The fractions were collected to give the product, which was a mixture of mono and bis-brominated materials, as a clear oil.

1. temperatureto reflux overnight
2. temperaturethe reaction refluxed for 4 hrs
3. temperaturecooled
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue was chromatographed on silica eluting with a gradient of 0-10% EtOAc/Hexanes
7. customThe fractions were collected
8. customto give the product, which
9. additiona mixture of mono and bis-brominated materials