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Stereoselective addition of ethyl 3-morpholino(piperidino)-crotonates to 2-trihalomethyl-3-nitro-2H-chromenes. Synthesis of 4-acetonyl-3-nitrochromans

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Chemistry of Heterocyclic Compounds Aims and scope

Tertiary enamines of acetoacetic ester, obtained with morpholine and piperidine, add to 2-R1-3-nitro-2Н-chromenes (R1 = CF3, CCl3, Ph) via the vinylogue β-methyl group and give the respective cis,trans-2,3,4-trisubstituted chromans, the stereoconfiguration of which was established by X-ray structural analysis. Acidic hydrolysis of these compounds was accompanied by decarboxylation and produced 4-acetonyl-3-nitrochromans with retention of configuration.

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The results of this work were obtained within the framework of fulfilling the State Assignment of the Ministry of Education and Science of Russia, with partial financial support from the Russian Foundation for Basic Research (project No. 14-03-00179).

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Correspondence to Vyacheslav Ya. Sosnovskikh.

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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2015, 51(5), 440–446

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Korotaev, V.Y., Kutyashev, I.B., Barkov, A.Y. et al. Stereoselective addition of ethyl 3-morpholino(piperidino)-crotonates to 2-trihalomethyl-3-nitro-2H-chromenes. Synthesis of 4-acetonyl-3-nitrochromans. Chem Heterocycl Comp 51, 440–446 (2015). https://doi.org/10.1007/s10593-015-1718-1

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