(±)-Thaliporphine (VI) was readily oxidized with lead tetraacetate in acetic acid to give amorphous (±)-4β-acetoxythaliporphine (VIII), which was con-verted into (±)-cataline (V) in 86·5% overall yield.
O. Hoshino, H. Hara, M. Ogawa and B. Umezawa, J. Chem. Soc., Chem. Commun., 1975, 306 DOI: 10.1039/C39750000306
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