反应详情

To a solution of methyl 3,5-dibromo-4-methylbenzoate (150.0 g, 0.487 mol) in 2 L anhydrous CCl4 under a nitrogen atmosphere was added N-bromosuccinimide (125.7 g, 0.706 mol) and benzoyl peroxide (12.98 g, 0.054 mol). The solution was then heated to reflux. Once the solution reached reflux it was irradiated with a 250 W sun lamp. After 6 h the solution was cooled to RT and filtered. The precipitate (succinimde) was washed with DCM and the filtrate concentrated. The residue (ca. 246 g) was purified by silica gel chromatography (3 Kg SiO2) using 5 to 25% DCM/hexanes as the eluent to give methyl-4-bromomethyl-3,5-dibromo-benzoate. 1H NMR(CDCl3, 500 MHz): δ 3.93 (s, 3H), 4.84 (s, 2H), 8.21 (s, 2H). MS(ES) 385 (M+1); LC 1: 3.93 min.

1. temperatureThe solution was then heated to reflux
2. temperatureOnce the solution reached reflux it
3. customwas irradiated with a 250 W sun lamp
4. filtrationfiltered
5. washThe precipitate (succinimde) was washed with DCM
6. concentrationthe filtrate concentrated
7. customThe residue (ca. 246 g) was purified by silica gel chromatography (3 Kg SiO2)