反应详情

5-Nitro-2-(2-pyrrolidin-1-yl-ethyl)-2H-indazole (0.325 g, 1.18 mmol), iron powder (0.659 g, 11.8 mmol) and ammonium chloride (0.0317 g, 0.592 mmol) was suspended in a 4:1 ethanol/H2O solution and heated to reflux for 3 hours. The mixture was cooled to room temperature, the solvent were removed in vacuo and the residue stirred in triethylamine/ethyl acetate (1/4, 30 mL) for 15 minutes. The mixture was filtered through a plug of silica gel, rinsed with triethylamine/ethyl acetate (1/4) and the filtrate was concentrated to afford the title product. 1H NMR (300 MHz, DMSO-d6) ppm 1.31–1.52 (m, 6H) 2.40 (m, 4H), 2.78 (m, 2H), 4.38 (t, 2H, J=6.78), 4.79 (s, 2H), 6.55 (m, 1H), 6.72 (m, 1H), 7.29 (s, 1H), 7.89 (s, 1H); MS (DCI/NH3) m/z 245 [M+H]+.

1. temperatureheated
2. temperatureto reflux for 3 hours
3. customthe solvent were removed in vacuo
4. filtrationThe mixture was filtered through a plug of silica gel
5. washrinsed with triethylamine/ethyl acetate (1/4)
6. concentrationthe filtrate was concentrated