Water → 2-tert-butyl-5-nitro-1H-indole-4-carbonitrile

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Reaction Conditions

Reaction Steps

To a solution of 2-tert-butyl-4-fluoro-5-nitro-1H-indole (4.0 g, 17 mmol) in DMSO (30 mL) was added KCN (3.4 g, 51 mmol). The mixture was stirred at 70° C. for 3 hours, and poured into water (80 mL) and extracted with ethyl acetate (50 mL×3). The combined organic layers were washed with brine, dried over anhydrous Na2SO4 and concentrated under vacuum. The residue was purified by column chromatography on silica gel (7% EtOAc in petroleum ether) to afford 2-tert-butyl-5-nitro-1H-indole-4-carbonitrile (2.2 g, 53%). 1H NMR (DMSO, 300 MHz) δ 12.23 (br s, 1H), 8.09 (d, J=9.0 Hz, 1H), 7.75 (d, J=9.0 Hz, 1H), 6.50 (s, 1H), 1.38 (s, 9H). MS (ESI) m/z: 244.2 [M-41].

Provenance & Evidence