4‐Hydroxy‐7‐methoxy‐2‐methyl‐5H‐1‐benzopyrano[4,3‐b]pyridin‐5‐one |
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Authors: | Viktor Kettmann,Jan Sv tlí k,Christoph Kratky |
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Affiliation: | Viktor Kettmann,Jan Světlík,Christoph Kratky |
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Abstract: | The title compound, C14H11NO4, consists of a methoxy‐substituted coumarin skeleton fused to a 2‐methyl‐4‐pyridone ring. The ring system of the molecule is approximately planar and the methoxy group is roughly coplanar with the ring plane. The 4‐pyridone ring exists in a 4‐hydroxy tautomeric form and is stabilized by an intramolecular hydrogen bond between the O—H and C=O groups. Comparison of the results with those found for other structures containing the 4‐pyridone substructure reveals a substantial effect of the nature of the substituents bonded to the pyridine ring on the keto–enol tautomerism. |
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