Tetrabutylammonium Fluoride → 2-tert-Butyl-1-methyl-5-nitro-1H-indole

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Reaction Steps

A solution of [2-(3,3-dimethyl-but-1-ynyl)-4-nitro-phenyl]-methyl-amine (5.0 g, 22.9 mmol) and TBAF (23.9 g, 91.6 mmol) in THF (50 mL) was heated at reflux overnight. The solvent was removed by evaporation under vacuum and the residue was dissolved in brine (100 mL) and EtOAc (100 mL). The organic phase was separated, dried over Na2SO4 and evaporated under vacuum to give 2-tert-butyl-1-methyl-5-nitro-1H-indole (5.0 g, 99%), which was used in the next step without further purification. 1H NMR (CDCl3, 400 MHz) δ 8.47 (d, J=2.4 Hz, 1H), 8.07 (dd, J=2.4, 9.2 Hz, 1H), 7.26-7.28 (m, 1H), 6.47 (s, 1H), 3.94 (s, 3H), 1.50 (s, 9H).

Provenance & Evidence