Abstract
The reaction of malononitrile with 3-thiocarbamoylchromones was accompanied by rearrangement, resulting in the formation of 2,5-dihydro-1H-chromeno[2,3-b]pyridine-3-carbonitriles or 2-imino-5-oxo-1-phenyl-2,5-dihydro-1H-chromeno[2,3-b]pyridine-3-carbothioamides, depending on the nature of the substituents in the thiocarbamoyl moiety. This reaction sharply differs from the reaction of malononitrile with 3-carbamoylchromones, which gives coumarino-pyridines.
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