5,6,13,13a-Tetrahydro-1,9-dihydroxy-2,3,10-trimethoxy-8H-dibenzo[a, g]quinolizine (I), formerly thought to be capaurimine, has been synthesized, but was not identical with natural capaurimine. The 3,9-dihydroxy-1,2,10-trimethoxy-isomer (II) was also synthesized but was not identical with natural capaurimine. The previous assignment of the position of the substituents in capaurimine is therefore incorrect.
T. Kametani, K. Fukumoto, H. Yagi, H. Iida and T. Kikuchi, J. Chem. Soc. C, 1968, 1178 DOI: 10.1039/J39680001178
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