K. Sugita et al., SYNTHETIC STUDIES TOWARDS PHORBOLS - SYNTHESIS OF B OR C RING-SUBSTITUTED PHORBOL SKELETONS IN THE NATURALLY-OCCURRING FORM, Synlett, (5), 1994, pp. 325-329
The optically active phorbol skeletons with an allylic alcohol moiety
in B ring 2 or a hydroxyl group in C ring 3 have been constructed in a
stereocontrolled manner starting with (+)-3-carene.