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Synthesis of 4-nitro-γ-carbolines by Graebe–Ullmann reaction

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Chemistry of Heterocyclic Compounds Aims and scope

Graebe–Ullmann reaction was used to synthesize 3-aryl(methyl)-1-methyl(cyclopropyl)-4-nitro-5Н-pyrido[4,3-b]indoles containing substituents in the pyridine ring. A new scheme was developed for the synthesis of the starting 1-[6-aryl(methyl)-2-methyl(cyclopropyl)- 3-nitropyridin-4-yl]-1Н-1,2,3-benzotriazoles: 1) ammonolysis of 3-nitroisonicotinic acid ethyl esters, 2) a modified Hofmann reaction of 3-nitroisonicotinamides, 3) cleavage of ethyl (2-aryl-3-nitropyridin-4-yl)carbamates, 4) synthesis of 4-chloro-3-nitropyridines by diazotation reaction of 4-amino-3-nitropyridines, followed by nucleophilic substitution of diazo group in 4-pyridyldiazonium salts with a chlorine atom.

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This work received financial support from the Russian Foundation for Basic Research (grant 16-43-550144r_a) and from the Ministry of Education of the Omsk region.

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Correspondence to Galina P. Sagitullina.

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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2019, 55(9), 844–850

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Shuvalov, V.Y., Shestakov, A.N., Kulakova, L.A. et al. Synthesis of 4-nitro-γ-carbolines by Graebe–Ullmann reaction. Chem Heterocycl Comp 55, 844–850 (2019). https://doi.org/10.1007/s10593-019-02547-w

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  • DOI: https://doi.org/10.1007/s10593-019-02547-w

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