23-oxo-isopristimerin III: A new natural phenolic (9+8)-24-nor-d:a-friedo-oleanan triterpene

✍ Scribed by G.M. Kamal; B. Gunaherath; A.A. Leslie Gunatilaka

• Book ID: 104221379
• Publisher: Elsevier Science
• Year: 1983
• Tongue: French
• Weight: 108 KB
• Volume: 24
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(00)88027-2

✦ Synopsis

The structure of a new natural phenolic I9+61-24-nor-O:A-friedo-oleanan triterpene isolated from IL?koona zeylanica has been established as 23-oxo-isopristimerin III. Recently we reported the structure of the first phenolic triterpene, zeylasterone, obtained from K. zeyZanica'. We now wish to report a minor triterpane present in this plant whose structure has been established as 23-oxo-isopristimerin III [II, based on the following data. 2 The IR(KBr) spectrum of 23-oxo-isopristimerin III, C3DH360r, m-p. 157-60°, showed the presence of OH (3500-32001brlcm-1 I, saturated ester CO (1722 cm-l1 and aB-unsaturated aldehyde CD [I642 cm-l]. The UV spectrum [A max [EtOH,log ~1 263c3.151, 277sh(3.1711 suggested the absence of both pristimerin [Sl and zeylasterone type chromophoresl