Hydrazine hydrate (1:1) → 4-(5-methyl-4-phenyl-1H-pyrazol-3-yl)benzene-1,3-diol

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Reaction Steps

This compounds was synthesised in the same manner as described above. 7-Hydroxy-2-methyl-3-phenyl-chromen-4-one (0.5 g, 1.70 mmol), hydrazine hydrate (5 ml), ethanol (10 ml). The quenched solution was extracted into ethyl acetate, washed (water), dried (MgSO4), and the solvent removed under vacuum to give a yellow oil which was purified by column chromatography to give 4-(5-Methyl-4-phenyl-1H-pyrazol-3-yl)-benzene-1,3-diol as an off white solid (0.37 g, 88%); Rf 0.7 Cf SM 0.8 ethyl acetate/hexane (80/20).

Provenance & Evidence