Oxidation of 1,2,3,4-tetrahydro-7-hydroxy-1-(2-hydroxy-4-methoxyphenethyl)-6-methoxy-2-methylisoquinoline (III) and its methoxy-analogue (IV) with ferric chloride gave ortho-dienone-type homoproaporphines [(Va) and (VIa), respectively]. The mass spectral patterns of the ortho-dienones [(Va) and (VIa)] are also discussed.
T. Kametani, K. Fukumoto, T. Hayasaka, F. Satoh and K. Kigasawa, J. Chem. Soc. C, 1969, 4 DOI: 10.1039/J39690000004
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