(Methoxymethylene)malononitrile → 5-amino-1-(2-methoxyphenyl)-1H-pyrazole-4-carbonitrile

Participants

Reaction Steps

To a solution of 1-(2-methoxyphenyl)hydrazine hydrogen chloride (3 g, 0.017 mol) in ethanol (50 mL) was added 2-(methoxymethylene)malononitrile (1.89 g, 0.9 eq.) and sodium methoxide (1.92 g, 2.1 eq). The reaction mixture was heated at reflux for 18 h and concentrated. The reaction mixture was partitioned between brine and ethyl acetate. The organic layer was separated, dried with magnesium sulfate, filtered and concentrated. MPLC Biotage chromatography eluting with 20-60% ethyl acetate/hexanes afforded the title compound in 53% yield (1.9 g). 400 MHz 1H NMR (CDCl3) δ 7.64 (m, 1 H), 7.40 (m, 2H), 7.08 (m,2H), 4.51 (bs, 2H), 3.87 (s, 3 H); MS: (M+H m/z=215.2).

Provenance & Evidence