反应详情

To a solution of 3-bromo-4-chlorobenzoic acid (5.0 g, 21 mmol) in 150 mL absolute ethanol was added 15 mL of 4N HCl/dioxane. The mixture was heated to reflux for 24 hours then cooled to ambient temperature and concentrated under reduced pressure. The residue was partitioned between ethyl acetate and H2O, and the separated organic phase was washed sequentially with saturated NaHCO3 solution, brine, dried (Na2SO4), filtered and concentrated under reduced pressure to provide the title compound. 1H NMR (DMSO-d6) δ 8.22 (d, 1H), 7.94 (dd, 1H), 7.80 (d, 1H), 4.33 (q, 2H), 1.33 (t, 3H); MS (DCI+) m/z 263 (M+H)+.

1. temperatureThe mixture was heated
2. temperatureto reflux for 24 hours
3. concentrationconcentrated under reduced pressure
4. customThe residue was partitioned between ethyl acetate and H2O
5. washthe separated organic phase was washed sequentially with saturated NaHCO3 solution, brine
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure