Abstract Three triterpenes obtained from the inner bark of Kokoonazeylanica have been identified as friedelin, D:A-friedo-olean-3, 21-dione and 21α-hydroxy- D:A-friedo-olean-3-one by spectroscopic properties and chemical interconversions. Their chemotaxonomic significance is emphasized.
The twoD:A-friedo-oleanane triterpenes kokzeylanol and 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
Abstract Carbon-13NMR has been used to detect the position of angular methyl oxygenation and determine the structure of 21α,26-dihydroxy-D:A-friedooleanan-3-one, a new trioxygenated friedooleanane from Salacia reticulata var. diandra and the assignment has been confirmed chemically.
Gunatilaka, A. A. Leslie; Nanayakkara, N. P. Dhammika; Sultanbawa, M. Uvais S., Journal of the Chemical Society. Perkin transactions I, 1983, # 10, p. 2459 - 2469
作者:Gunatilaka, A. A. Leslie、Nanayakkara, N. P. Dhammika、Sultanbawa, M. Uvais S.
DOI:——
日期:——
414. Triterpenes of the friedelane series. Part I. Ketones