反应详情

A mixture of dimethyl-[2-(5-nitro-indazol-1-yl)-ethyl]-amine (1 g, 4.3 mmol), iron powder (1.9 g, 34 mmol), and ammonium chloride (120 mg, 2.2 mmol) in a 4:1 ethanol/H2O solution (20 mL) was heated to reflux for 3 hours, cooled to room temperature and concentrated under reduced pressure. The residue was stirred in triethylamine/ethyl acetate (1/4, 10 mL) for 15 minutes and then filtered through a plug of silica gel which was rinsed with triethylamine/ethyl acetate (1/4). The filtrate was concentrated under reduced pressure to provide the title compound (0.80 g, 92%). 1H NMR (300 MHz, DMSO-d6) ppm 2.15 (s, 6H), 2.64 (t, J=6.44, 2H), 4.34 (t, J=6.44, 2H), 4.77 (s, 2H), 6.72 (m, 1H), 6.79 (m, 1H), 7.35 (m, 1H), 7.67 (m, 1H); MS (DCI/NH3) m/z 205 [M+H]+.

1. temperaturewas heated
2. temperatureto reflux for 3 hours
3. concentrationconcentrated under reduced pressure
4. filtrationfiltered through a plug of silica gel which
5. washwas rinsed with triethylamine/ethyl acetate (1/4)
6. concentrationThe filtrate was concentrated under reduced pressure