Tetrahedron p. 805 - 810 (1984)
Update date:2022-08-03
Topics:
Gunatilaka, A. A. Leslie
Nanayakkara, N. P. Dhammika
The two D:A-friedo-oleanane triterpenes kokzeylanonol isolated from the inner bark of Kokoona zeylanica have been characterized as 6β,27-dihydroxy-D:A-friedo-olean-3-one and 6β,27-dihydroxy-D:A-friedo-olean-3,21-dione, respectively, by the deoxygenation of their 27-acetoxy derivatives using lithium-ethylenediamine reduction coupled with spectroscopic and irradiation methods.Kokzeylanonol represents the first tetra-oxygenated D:A-friedo-oleanane triterpene obtained from a natural source.Significance of some of these D:A-friedo-oleananes in the biosynthesis of quinonoid triterpenes in Celastraceae is discussed.
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