反应详情

Cu(II) oxide (2.1 g, 26 mmol, 2.5 eq) was added to a mixture of 3-bromobenzonitrile (3.8 g, 21 mmol, 2.0 eq), 3-hydroxypyridine (1.0 g, 10 mmol, 1.0 eq), K2CO3 (3.0 g, 22 mmol, 2.1 eq) and pyridine (35 mL) at 80° C. The mixture was refluxed vigorously for 20 h and cooled to rt. CH2Cl2 was added and the mixture was filtered through celite. Pyridine was removed in vacuo and the residue dissolved in EtOAc and washed with 1N HCl (1×), 1N NaOH (1×), brine (1×), dried (MgSO4), filtered and concentrated in vacuo. Purification by flash chromatography on silica gel afforded 1.5 g (73%) of the title compound as a white solid: 1H NMR (400 MHz, DMSO-d6) δ 8.15 (dd, J=4.9, 1.6 Hz, 1H), 7.89 (td, J=7.6, 2.0 Hz, 1H), 7.69-7.67 (m, 2H), 7.61 (t, J=8.0 Hz, 1H), 7.51-7.49 (m, 1H), 7.17 (dd, J=7.0, 5.1 Hz, 1H), 7.12 (d, J=8.3 Hz, 1H); ES-MS [M+1]+: 197.2.

1. temperatureThe mixture was refluxed vigorously for 20 h
2. filtrationthe mixture was filtered through celite
3. customPyridine was removed in vacuo
4. dissolutionthe residue dissolved in EtOAc
5. washwashed with 1N HCl (1×), 1N NaOH (1×), brine (1×)
6. dry with materialdried (MgSO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customPurification by flash chromatography on silica gel