SYNTHESIS OF INDAZOLE DERIVATIVES FROM 3,5-DIARYL-6-ETHOXYCARBONYL-2-CYCLOHEXEN-1-ONES

) 4H), 8.2 (d, J = 8.0 Hz, 2H), 11 (br, 1H) 135.8, 139.4, 139.8, 140.5,143.0, 148.4, 158.1In summary, we have described a convenient method for the preparation of 4,6-diaryl-3-hydroxyindazoles from the reaction of 3,5-diaryl-6-ethoxycarbonyl-2-cyclohexen-1-ones withhydrazine hydrate or phenylhydrazine. Compared to the previous report, using a 1:2 ratio ofstarting materials in our procedure produces 3-hydroxyindazole tautomers which are assigned byIR and NMR spectroscopy.