An efficient and simple method for the synthesis of new 5-oxo-5H-chromeno[4,3-b]pyridine derivatives via Michael addition of 4-aminocoumarin to arylidenemalononitrile for 20 min at 150°C without any solvent is proposed. The advantages of this procedure are mild reaction conditions, high yields of products, and operational simplicity.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1963-1967, December, 2012.
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Motamedi, R. Solvent-free synthesis of novel 5-oxo-5H-chromeno[4,3-b]pyridine derivatives. Chem Heterocycl Comp 48, 1839–1843 (2013). https://doi.org/10.1007/s10593-013-1217-1
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DOI: https://doi.org/10.1007/s10593-013-1217-1