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Verticillane and Norverticillane Diterpenoids from the Formosan Soft Coral Cespitularia hypotentaculata

✍ Scribed by Jiun-Yang Chang; Mohamed H. Abd El-Razek; Ya-Ching Shen

Publisher
John Wiley and Sons
Year
2009
Tongue
German
Weight
258 KB
Volume
92
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Five new diterpenes, cespihypotins W–Z (1–4, resp.) and cespihypotone (5) have been isolated from the AcOEt‐soluble fraction of the Formosan soft coral Cespitularia hypotentaculata. Two of them having the norverticillane skeleton, i.e., 1 and 2, and the other three, 3–5, possessing a verticillane skeleton. The structures were established as (+)‐(1__β__H,7__E__)‐6__β__,11__β__‐dihydroxynorverticilla‐4(18),7‐diene‐10,12‐dione (1), (+)‐(1__β__H,7__E__)‐6__β__‐acetoxy‐11__β__‐hydroxynorverticilla‐4(18),7‐diene‐10,12‐dione (2), (−)‐(1__β__H,7__E__)‐6__β__‐acetoxyverticilla‐4(18),7,11‐triene‐10,12‐γ‐lactone (3), (+)‐(1__β__H,7__E__)‐6__β__‐acetoxy‐10‐hydroxyverticilla‐4(18),7,11‐triene‐10,12‐γ‐lactone (4), and (+)‐(1__β__H,3__Z__)‐10__β__‐hydroxy‐6‐oxoverticilla‐3,11‐diene‐10,12‐γ‐lactone (5), respectively, on the basis of 1D‐ and 2D‐NMR spectroscopic analyses.

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