The reaction of thebainone-A enol methyl ether with benzoquinone involves a novel closure of the oxide bridge to give codeinone p-hydroxyphenyl methyl acetal. Hydrolysis of this adduct and of its dihydro-derivative gave codeinone and dihydrocodeinone respectively.
J. B. Taylor, J. Chem. Soc. C, 1968, 1506 DOI: 10.1039/J39680001506
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