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Three New Highly Oxygenated Diterpenoids from Excoecaria cochinchinensis Lour.

✍ Scribed by Jing-Hua Yang; Shi-De Luo; Jing-Feng Zhao; Yun-song Wang; Rong Huang; Hong-Bin Zhang; Liang Li

Publisher
John Wiley and Sons
Year
2005
Tongue
German
Weight
195 KB
Volume
88
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Chemical examination of the AcOEt extract of the leaves and twigs of Excoecaria cochinchinensis Lour. collected from Xishuangbanna resulted in the isolation of the three new highly oxygenated diterpenoids 1–3. The structures of the new diterpenoids were elucidated by a study of their physical and spectra data as (2__β__,3__β__,5__α__,6__α__)‐2,3‐bis(acetyloxy)‐8,13‐epoxy‐6,9‐dihydroxylabd‐14‐en‐11‐one (=excolabdone A; 1), (1__α__,5__α__,6__β__,7__β__)‐1,6‐bis(acetyloxy)‐8,13‐epoxy‐7,9‐dihydroxylabd‐14‐en‐11‐one (=excolabdone B; 2), and (1__α__,5__α__,6__β__,7__β__)‐6‐(acetyloxy)‐8,13‐epoxy‐1,7,9‐trihydroxylabd‐14‐en‐11‐one (=excolabdone C; 3).

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