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

Participants

Reaction Conditions

Reaction Steps

4-Nitroindazole (3.00 g, 18.4 mmol) and potassium carbonate (7.50 g, 54.4 mmol) in 60 mL of DMF was stirred for 30 minutes after which 1-(2-chloro-ethyl)-pyrrolidine hydrochloride (4.80 g 28.4 mmol) was added. The mixture was heated to 60° C. for 6 hours, cooled to room temperature and filtered through a plug of silica gel. The silica gel was rinsed with triethylamine/ethyl acetate (1/4), the combined filtrate was concentrated under reduced pressure and the residue purified by flash chromatography (silica gel, triethylamine/ethyl acetate 1/30). 1H NMR (300 MHz, DMSO-d6) δ ppm 1.60 (m, 4H), 2.45 (m, 4H), 2.92 (t, 2H, J=6.45), 4.65 (t, 2H, J=6.45), 7.65 (m, 1H), 8.10 (m, 1H), 8.30 (m, 1H), 8.52 (s, 1H); MS (DCI/NH3) m/z 261 [M+H]+.

Provenance & Evidence