A new synthetic route to erythrinan alkaloids was developed, via the cis-c/D-ring fused 15-methoxy-16-hydroxydioxoerythrinan-2,8-dione (III) as the key intermediate, from the enol methyl derivative (II) which was obtained by Birch reduction of the benzyl amide (I).
M. Haruna and K. Ito, J. Chem. Soc., Chem. Commun., 1976, 345 DOI: 10.1039/C39760000345
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