Synthesis of lupane and 19β,28-epoxy-18α-oleanane 2,3-seco-derivatives based on betulin

@article{Tolmacheva2008SynthesisOL,
  title={Synthesis of lupane and 19$\beta$,28-epoxy-18$\alpha$-oleanane 2,3-seco-derivatives based on betulin},
  author={I. A. Tolmacheva and A. V. Nazarov and O. Maiorova and V. V. Grishko},
  journal={Chemistry of Natural Compounds},
  year={2008},
  volume={44},
  pages={606-611}
}
The α-hydroxyoximes of methyl betulonate and allobetulone were synthesized. Beckmann fragmentation of them produced the lupane and 19β,28-epoxy-18α-oleanane 2,3-seco-derivatives. 

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