544676-41-7Relevant articles and documents
Synthesis of 3-substituted 1-aryl-4,6-dinitro-1H-indazoles based on picrylacetaldehyde and their behavior in nucleophilic substitution reactions
Starosotnikov,Kachala,Lobach,Vinogradov,Shevelev
, p. 1782 - 1790 (2007/10/03)
A method for the synthesis of 1-aryl-3-formyl-4,6-dinitro-1H-indazoles by the reaction of picrylacetaldehyde with aryldiazonium salts followed by intramolecular cyclization of the resulting picrylglyoxal monoarylhydrazones was developed. Various 4,6-dinitro-1-phenyl-1H-indazoles substituted in position 3 were prepared via transformations involving the formyl group of 3-formyl-4,6-dinitro-1-phenyl-1H-indazole. 3-R-4,6-Dinitro-1-phenyl-1H- indazoles (R = CHO, CN, 1,3-dioxolan-2-yl) react regiospecifically with anionic O-, S-, and N-nucleophiles, in particular, with replacement of only the 4-NO2 group. Thus previously unknown 3-R-4-Nu-6-nitro-1-phenyl-1H- indazoles were synthesized (Nu is a nucleophile residue).
Synthesis and reactions of 1-aryl-3-formyl-4,6-dinitro-1H-indazoles
Vinogradov, Vasilii M.,Starosotnikov, Aleksei M.,Shevelev, Svyatoslav A.
, p. 198 - 200 (2007/10/03)
The title compounds were prepared by the reactions of picrylacetaldehyde with aryldiazonium salts followed by the intramolecular cyclization of the resulting picrylglyoxal monoarylhydrazones, and the regiospecific substitution for the nitro group at the 4-position under the action of anionic N-, O- and S-nucleophiles was found.
