反应详情

A mixture of 2-chloro-5-iodo-toluene (0.5 g, 1.98 mmol), N-bromosuccinimide (0.422 g, 2.35 mmol) and benzoyl peroxide (21.5 mg, 0.089 mmol) in dry CCl4 (5 mL) was stirred and heated to reflux for 3 h. After cooling, the mixture-was filtered, and the red filtrate was washed with a saturated solution of sodium thiosulfate (2×10 mL). The organic phase was washed with brine, dried over Na2SO4, filtered and concentrated. The residue was purified by flash chromatography on silica gel (petroleum ether), to give 60 as a white solid (361 mg, 55%). 1H NMR (CDCl3, 300 MHz) δ 7.76 (d, J=2.4 Hz, 1H), 7.56 (dd, J=8.7, 2.1 Hz, 1H), 7.12 (d, J=8.4 Hz, 1H), 4.49 (s, 2H). MS (m/e) (positive FAB) 332.1 (M+H)+, m.p. 94-95° C.

1. temperatureheated
2. temperatureto reflux for 3 h
3. temperatureAfter cooling
4. filtrationthe mixture-was filtered
5. washthe red filtrate was washed with a saturated solution of sodium thiosulfate (2×10 mL)
6. washThe organic phase was washed with brine
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated
10. customThe residue was purified by flash chromatography on silica gel (petroleum ether)