Potassium tert-butoxide → 5-nitro-2-(pyridin-2-yl)-1H-indole

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To the solution of 4-nitro-2-(pyridin-2-ylethynyl)aniline (1.5 g, 6.3 mmol) in DMF (50 mL) was added t-BuOK (1.5 g, 13 mmol). The reaction mixture was stirred at 90° C. for 2 h. The mixture was diluted with water and extracted with dichloromethane (3×50 mL). The combined organic layers were washed with brine, dried over anhydrous Na2SO4 and concentrated in vacuum. The residue was purified by chromatography on silica gel (5-10% ethyl acetate/petroleum ether) to afford 5-nitro-2-(pyridin-2-yl)-1H-indole (1.0 g, 67% yield). 1H NMR (300 MHz, d-DMSO) δ 12.40 (s, 1H), 8.66 (d, J=2.1 Hz, 1H), 8.58 (d, J=1.8 Hz, 1H), 8.07-7.91 (m, 3H), 7.59 (d, J=6.6 Hz, 1H), 7.42-7.37 (m, 2H).

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