Phenolic oxidation of 1,2,3,4-tetrahydro-7-hydroxy-1-(3-hydroxy-4,5-dimethoxybenzyl)-6-methoxy-2-methyl-isoquinoline (III) unexpectedly afforded 3-hydroxy-4,5-dimethoxybenzaldehyde (XVII) and a cyclopent[ij]isoquinolinone (XVIII), whose structures were elucidated by spectral determinations.
T. Kametani and I. Noguchi, J. Chem. Soc. C, 1968, 447 DOI: 10.1039/J39680000447
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