Sodium Hydroxide → 5-amino-3-[(dibutylamino)methyl]-1-(phenylmethyl)-1H-pyrazole

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A solution of 4-dibutylamino-2-butynenitrile in ethanol (10 mL) was added to a stirring solution of benzylhydrazine dihydrochloride (3.0 g, 15.4 mmol) and 3.0 N NaOH (5.00 mL, 15.4 mmol) in ethanol (50 mL). The resulting solution as stirred (2 hours, 25° C.), then concentrated. The residue was taken up in ethyl acetate (250 mL), washed with brine (3×90 mL), then dried (MgSO4) and concentrated in vacuo. The resulting oil was chromatographed on silica (80:20 hexane:ethyl acetate) to yield 0.70 g (14.5%) of 5-amino-3-[(dibutylamino)methyl]-1-(phenylmethyl)-1H-pyrazole as an orange oil. 1H NMR (250 MHz, CDCl3 δ 7.22 (m, 6H), 4.56 (s, 2H), 4.00 (br s, 2H), 2.30 (m, 4H), 1.34 (m, 8H), 0.90 (t, 6H).

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