反应详情

3-bromo-2,5-dichlorophenol (8.0 g, 33 mmol) and 2,3-dichloronitrobenzene (6.4 g, 33 mmol) were dissolved in NMP (30 mL), followed by the addition of potassium carbonate (5.5 g, 40 mmol). The resulting suspension was placed in an oil bath at 120° C. for 7 hours, after which the reaction mixture was diluted with water (150 mL) and extracted with ethyl acetate (2×00 mL). The combined organic fractions were washed with water (3×100 mL), dried (MgSO4), filtered and the solvent was evaporated under reduced pressure. The resulting residue was purified by column chromatography on silica gel (330 g) eluting with 0-20% CH2Cl2/hexanes to afford the title compound. 1H NMR (CDCl3) δ 7.98 (dd, J=8.2 Hz, J=1.6 Hz, 1H), 7.79 (dd, J=8.2 Hz, J=1.6 Hz, 1H), 7.44 (dd, J=8.2 Hz, J=8.2 Hz, 1H), 7.40 (d, J=2.2 Hz, 1H), 6.54 (d, J=2.2 Hz, 1H).

1. extractionextracted with ethyl acetate (2×00 mL)
2. washThe combined organic fractions were washed with water (3×100 mL)
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. customthe solvent was evaporated under reduced pressure
6. customThe resulting residue was purified by column chromatography on silica gel (330 g)
7. washeluting with 0-20% CH2Cl2/hexanes