Synthesis of 3-R2-4-R1-acetyl-(ethoxycarbonyl)-6-hydroxy-6-methylindazoles

It was discovered that functionally substituted tetrahydroindazoles can be aromatized by the action of sulfur. Previously unknown 3-R²-4-R¹-5-acetyl(ethoxycarbonyl)-6-methylindazoles were obtained. The products from aromatization cannot be obtained if a nitro group is introduced or one heteroatom in the substrate is replaced by oxygen.N. G. Chernyshevskii Saratov State University, Saratov, Russia. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 757–759, June, 1999.