反应详情

A solution of ethylamine in THF (2 M, 13.8 mL, 27.6 mmol) was added slowly to a solution of 2,6-dichloro-3-nitrobenzonitrile (3.0 g, 13.8 mmol) in THF (30 mL) at −5° C. After 1.5 h, the solution was diluted with EtOAc (150 mL) and washed with 0.5 N HCl and brine. Organics were dried (MgSO4) and concentrated in vacuo. Purification by silica gel chromatography (8:1:1 hexanes/CHCl3/EtOAc) gave 2.57 g (82%) of the title compound as an orange solid. 1H NMR (400 MHz, CDCl3): δ 8.51 (br s, 1H), 8.30 (d, 1H, J=8.8 Hz), 6.78 (d, 1H, J=8.4 Hz), 3.89-3.97 (m, 2H), 1.41 (t, 3H, J=7.2 Hz). MS (ES) [m+H] calc'd for C9H8N3O2Cl, 226, 228; found 226, 228.

1. washwashed with 0.5 N HCl and brine
2. dry with materialOrganics were dried (MgSO4)
3. concentrationconcentrated in vacuo
4. customPurification by silica gel chromatography (8:1:1 hexanes/CHCl3/EtOAc)