The condensation of 3-[(alkylsulfanyl)methyl]pentane-2,4-diones with aniline in the presence of catalytic amounts of acetic acid led to the formation of 1,1',1''-(6-methyl-1-phenyl-1,2,3,4-tetrahydropyridine-3,3,5-triyl)triethanone. The reaction is presumably a tandem process, incorporating the formation of β-enaminone, elimination of the alkanethiol molecule from the β-enaminone and the starting pentane-2,4-dione, and a subsequent [4+2] cycloaddition of the resulting intermediates. The mechanism of the conversion may also involve intramolecular cyclization of the Michael addition products of 3-[(alkylsulfanyl)methyl]pentane-2,4-dione to 3-(imidoyl)but-3-en-2-one, formed from β-enaminones during the elimination of alkanethiols.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2024, 60(1/2), 107–110
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Baeva, L.A., Gataullin, R.R. & Nugumanov, R.M. A synthesis of triacetyl-substituted 1,2,3,4-tetrahydropyridine by the reaction of 3-[(alkylsulfanyl)methyl]pentane-2,4-diones with aniline. Chem Heterocycl Comp 60, 107–110 (2024). https://doi.org/10.1007/s10593-024-03301-7
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DOI: https://doi.org/10.1007/s10593-024-03301-7