反应详情

A mixture of 5-Nitro-1-(2-pyrrolidin-1-yl-ethyl)-1H-indazole (3.00 g, 11.5 mmol), iron powder (6.50 g, 116 mmol), and ammonium chloride (310 mg, 5.85 mmol) in a 4:1 mixture of ethanol/H2O was heated to reflux for 3 hours, cooled to room temperature and concentrated under reduced pressure. The residue was taken up and stirred in triethylamine/ethyl acetate (1/4, 30 mL) for 15 minutes, 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. 1H NMR (300 MHz, DMSO-d6) δ ppm 1.62 (m, 4H), 2.44 (m, 4H), 2.81 (t, 2H, J=6.78), 4.36 (t, 2H, J=6.78), 4.77 (s, 2H), 6.72 (m, 1H), 6.79 (m, 1H), 7.35 (m, 1H), 7.68 (s, 1H); MS (DCI/NH3) m/z 231 [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