Betuline is what i want to use. Reaction below is what i found in some literature. That is interesting idea. So are you suggesting to use SeO2, T-BuOOH and PPh3 at once?
I have some idea too. How i normally do this reaction is: Disolve betuline in 2-metoxyethanol, add 2 eq. SeO2 and reflux for 4h.
What if i add Fehling's solution to this reaction?