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Three New, 1-Oxygenated ent-8,9-Secokaurane Diterpenes from Croton kongensis

✍ Scribed by Wei Chen; Xiao-Dong Yang; Jing-Feng Zhao; Jing-Hua Yang; Hong-Bin Zhang; Zi-Yan Li; Liang Li

Publisher
John Wiley and Sons
Year
2006
Tongue
German
Weight
72 KB
Volume
89
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Three new ent‐8,9‐secokaurane diterpenes, kongensins A–C (1–3), were isolated from the aerial parts of Croton kongensis, together with two known compounds, rabdoumbrosanin (4) and (7__α__,14__β__)‐7,14‐dihydroxy‐ent‐kaur‐16‐en‐15‐one (5). The structures of the new compounds were elucidated by HR‐MS as well as in‐depth 1D‐ and 2D‐NMR analyses. Compounds 1–3 showed an unusual oxygenation pattern, with an AcO or OH group at C(1), in combination with a Δ^8(14)^ unsaturation (1) or an 8,14‐epoxide function (2, 3).

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## Abstract One new __ent__‐8,9‐secokaurane diterpene, kongensin D (**1**), and one new __ent__‐kaurane diterpene, kongensin E (**2**), along with one known compound, (7__α__)‐7,18‐dihydroxy‐__ent__‐kaur‐16‐en‐15‐one 18‐acetate (**3**), were isolated from the aerial parts of __Croton kongensis.__ T