A ready and direct synthesis of the dibenzazonine (7), via VOF3 oxidation of (±)-N-trifluoroacetyl-norprotosinomenine (3) to the (±)-spirodienone (5), and high-yield conversion of (5) into (7) is reported.
S. M. Kupchan, C. Kim and J. T. Lynn, J. Chem. Soc., Chem. Commun., 1976, 86a DOI: 10.1039/C3976000086A
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