反应详情

To a stirred mixture of AcOH (650 mL) and EtOH (500 mL) was suspended 3-(2,6-dichloro-benzyloxy)-2-nitro-pyridine (37.4 g, 0.11 mol) and iron chips (69.4 g, 0.11 mol). The reaction was heated slowly to reflux and allowed to stir for 1 hr. The reaction was cooled to room temperature then filtered through a pad of celite. The resulting filtrate was neutralized with conc. NH4OH (600 mL) and then extracted with EtOAc (3×500 mL). The combined organic extracts were washed with saturated NaHCO3 (2×100 mL), H2O (2×100 mL) and brine (1×100 mL) then dried (Na2SO4), filtered and concentrated to dryness under vacuum to yield 3-(2,6-dichloro-benzyloxy)-pyridin-2-ylamine (32.4 g, 0.11 mol, 99%) as a light yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 7.56 (m, 3H), 7.46 (dd, 2H), 7.36 (d, 1H), 6.62 (dd, 1H), 6.18 (br s, 2H, NH2), 5.24 (s, 2H); MS m/z 270 [M+1].

1. temperatureThe reaction was heated slowly
2. temperatureto reflux
3. filtrationthen filtered through a pad of celite
4. extractionextracted with EtOAc (3×500 mL)
5. washThe combined organic extracts were washed with saturated NaHCO3 (2×100 mL), H2O (2×100 mL) and brine (1×100 mL)
6. dry with materialthen dried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated to dryness under vacuum