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

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A black solution of 3,4-dimethylphenyl hydrazine hydrochloride (Apollo, 1.73 g, 10.0 mmol) and 4,4-dimethyl-3-oxopentanenitrile (1.38 g, 11.0 mmol) in EtOH (20 mL) was stirred at reflux for 5 h. The cooled solution was concentrated in vacuo, redissolved in diethyl ether (20 mL) and washed with aqueous NaOH solution (1M, 20 mL). The aqueous was extracted with diethyl ether (2×20 mL), then the combined organics washed with brine (20 mL), dried (Na2SO4), filtered and concentrated in vacuo to leave the title compound (2.18 g, 90%). LCMS (Method 3): Rt 2.75 min, m/z 244 [MH+].

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