Pentanenitrile, 4,4-dimethyl-3-oxo- → 3-(tert-Butyl)-1-(quinolin-6-yl)-1H-pyrazol-5-amine

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A mixture of 1-(quinolin-6-yl)hydrazine hydrochloride (4.0 g, 20.5 mmol) and 4,4-dimethyl-3-oxo-pentanenitrile (3.6 g, 30 mol) in EtOH (50 mL) and conc. HCl (5 mL) was heated at reflux overnight. After removal of the solvent, the residue was purified by column chromatography to yield 3-t-butyl-1-(quinolin-6-yl)-1H-pyrazol-5-amine (2.8 g, 51% yield). 1H NMR (300 MHz, DMSO-d6): δ 8.84 (d, J=4.2 Hz, 1H), 8.37 (d, J=7.5 Hz, 1H), 8.09 (s, 1H), 8.04 (s, 2H), 7.52 (m, 1H), 5.46 (s, 1H), 5.40 (brs, 2H), 1.29 (s, 9H).

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