反应详情

A mixture of 5-Nitro-2-(2-pyrrolidin-1-yl-ethyl)-2H-indazole (0.250 g, 0.961 mmol), iron powder (0.536 g, 9.60 mmol) and ammonium chloride (0.0257 g, 0.480 mmol) in a 4:1 ethanol/H2O solution was heated to reflux for 3 hours and then cooled to room temperature. The solvent was removed under vacuo and the residue stirred in triethylamine/ethyl acetate (1/4, 30 mL) for 15 minutes and then filtered through a plug of silica gel. After rinsing with triethylamine/ethyl acetate (1/4), the filtrate was concentrated unde vacuo to provide the title product. 1H NMR (300 MHz, DMSO-d6) ppm 1.79 (s, 4H), 2.48 (m, 4H), 2.88 (s, 2H), 3.26 (m, 2H), 4.58 (m, 2H), 6.57 (m, 1H), 6.76 (m, 1H), 7.34 (m, 1H), 7.96 (s, 1H); MS (DCI/NH3) m/z 231 [M+H]+.

1. temperaturewas heated
2. temperatureto reflux for 3 hours
3. customThe solvent was removed under vacuo
4. filtrationfiltered through a plug of silica gel
5. washAfter rinsing with triethylamine/ethyl acetate (1/4)
6. concentrationthe filtrate was concentrated unde vacuo