Potassium Carbonate → 6-nitro-1-(2-pyrrolidin-1-yl-ethyl)-1H-indazole

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 6-nitroindazole (2.00 g, 12.3 mmol) and potassium carbonate (5.10 g 37.0 mmol) in DMF (40 mL) was stirred for 30 minutes, after which 1-(2-chloro-ethyl)-pyrrolidine hydrochloride (3.20 g 18.9 mmol) was added. The mixture was heated to 60° C. for 6 hours, cooled to room temperature, filtered through a plug of silica gel and rinsed with triethylamine/ethyl acetate (1/4). The filtrate was concentrated under reduced pressure and purified by flash chromatography (silica gel, triethylamine/ethyl acetate 1/30) to provide the title compound. 1H NMR (300 MHz, DMSO-d6) δ ppm 1.61 (m, 4H), 2.47 (m, 4H), 2.90 (t, 2H, J=6.45), 4.68 (t, 2H, J=6.44), 7.94 (m, 1H), 8.00 (m, 1H), 8.31 (s, 1H), 8.77 (s, 1H); MS (DCI/NH3) m/z 261 [M+H]+.

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