90702-18-4Relevant academic research and scientific papers
STUDIES ON TERPENOIDS AND STEROIDS-2; STRUCTURES OF TWO NEW TRI- AND TETRA-OXYGENATED D:A-FRIEDO-OLEANAN TRITERPENES FROM KOKOONA ZEYLANICA
Gunatilaka, A. A. Leslie,Nanayakkara, N. P. Dhammika
, p. 805 - 810 (2007/10/02)
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.
STRUCTURES OF KOKZEYLANOL AND KOKZEYLANONOL
Gunatilaka, Leslei A. A.,Nanayakkara, Dhammika, N. P.,Sultanbawa, Uvais, M.
, p. 1425 - 1428 (2007/10/02)
Kokzeylanol and kokzeylanonol obtained from Kokoona zeylanica have been shown to be 6β,27-dihydroxy-D:A-friedo-olean-3-one (1) and 6β,27-dihydroxy-D:A-friedo-oleana-3,21-dione (2), respectively by the deoxygenation of their 27-acetoxy derivatives using Lithium-ethylene diamine reduction coupled with spectroscopic and irradiation methods.Kokzeylanonol represents the first tetraoxygenated C:A-friedo-oleanoane isolated from a natural source.
