Potassium Carbonate → 3-chloro-4-nitro-1-(2-pyrrolidin-1-yl-ethyl)-1H-indazole

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 3-chloro-4-nitro-1H-indazole (0.550 g, 2.79 mmol) was treated with potassium carbonate (1.20 g 8.70 mmol) in DMF (10 mL) for 30 minutes, after which 1-(2-chloro-ethyl)-pyrrolidine hydrochloride (0.710 g, 4.20 mmol) was added. The mixture was heated to 50° C. for 6 hours, cooled to room temperature and filtered through a plug of silica gel which was rinsed with triethylamine/ethyl acetate (1/4). The combined 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 1.60 (m, 4H), 2.46 (m, 4H), 2.90 (t, 2H, J=6.44), 4.61 (t, 2H, J=6.44), 7.66 (m, 1H), 7.98 (m, 1H), 8.25 (m, 1H); MS (DCI/NH3) m/z 261 [M+H]+.

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