Abstract
AbstractReactions between 4‐ylideneoxazolin‐5‐ones and enaminocarbonyl compounds do not lead to 4,7‐dihydrooxazolopyridines. These reactions yield, by cleavage of the five‐membered ring, monocyclic derivatives whose structures are elucidated.Thus, starting from 4‐arylideneoxazolin‐5‐ones, mixtures of cis and trans dihydro‐α‐pyridones are formed but, in most cases, only the cis isomers can be isolated.Starting from 2‐phenyl‐4‐ethoxymethyleneoxazolin‐5‐one, reactions proceed, in addition, by loss of ethanol and α‐pyridones are obtained.
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