The reaction of chromone-3-carboxylic acid with indoles in boiling ethanol proceeds as a 1,4-nucleophilic addition with successive opening of the pyrone ring and decarboxylation to afford a series of previously unknown trans-indolyl chalcones in 27–60% yields.
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Kornev, M. Yu.; Moshkin, V. S.; Sosnovskikh, V. Ya. Mendeleev Commun., in press.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2015, 51(9), 858–860
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Kornev, M.Y., Moshkin, V.S. & Sosnovskikh, V.Y. A novel synthesis of (E)-1-(2-hydroxyphenyl)-3-(1Н-indol-3-yl)- prop-2-en-1-ones from chromone-3-carboxylic acid and indoles. Chem Heterocycl Comp 51, 858–860 (2015). https://doi.org/10.1007/s10593-015-1786-2
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DOI: https://doi.org/10.1007/s10593-015-1786-2