Abstract
The substituted piperidines, N-(piperidin-3-en-4-yl)-N-(1,2-dimethoxycarbonyl-etheno)arylamine and 1-aryl-3,4,5,6-tetramethoxycarbonyl-1,2-dihydrospiro[cyclo-[pyridine-2,4′-piperidine], were synthesized by the condensation of acetylenedicarboxylic ester with an azomethine, obtained from a γ-piperidone. It was found that the amounts of 1∶1 and 1∶2 addition compounds obtained depends on the ratio of starting reagents. Compounds isomeric at the vinyl group were examined in the case of one of the 1∶1 addition compounds. N-(1,2,5-trimethylpiperidin-4-yl)-N-(1,2-dimethoxycarbonyletheno)aniline was prepared by two methods.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 943–946, July, 1986.
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Kuznetsov, V.V., Gaivoronskaya, L.A., Murugova, L.A. et al. Condensation of N-(piperidylidene-4)arylamines with acetylenedicarboxylic esters. Chem Heterocycl Compd 22, 755–758 (1986). https://doi.org/10.1007/BF00522736
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DOI: https://doi.org/10.1007/BF00522736