The pentacyclic ketone (6), a direct precursor of vindorosine (1b), has been synthesised with an overall yield of 41%, by a six-step sequence involving a Diels–Alder reaction, stereospecific alkylation, and Pummerer rearrangement coupled with electrophilic cyclisation.
R. Z. Andriamialisoa, N. Langlois and Y. Langlois, J. Chem. Soc., Chem. Commun., 1982, 1118 DOI: 10.1039/C39820001118
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