Potassium Carbonate → 5-Nitro-2-(2-piperidin-1-yl-ethyl)-2H-indazole

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A mixture of 5-Nitroindazole (1.00 g, 6.13 mmol) and and potassium carbonate (2.50 g, 18.1 mmol) in 20 mL of N,N-dimethylformamide was stirred for 30 minutes and then 1-(2-chloro-ethyl)-piperidine hydrochloride (1.74 g 9.45 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 vacuo and the residue purified by flash chromatography (silica gel, triethylamine/ethyl acetate 1/30). 1H NMR (300 MHz, DMSO-d6) ppm 1.13–1.15 (m, 6H) 2.40 (m, 4H), 2.82 (t, 2H, J=6.44) 4.61 (t, 2H, J=6.44), 7.78 (m, 1H), 8.00 (m, 1H), 8.81 (s, 1H), 8.90 (d, 1H); MS (DCI/NH3) m/z 275 [M+H]+.

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