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Structure elucidation of casbane diterpenes from Croton argyrophyllus

✍ Scribed by Francisco Artur e Silva-Filho; Raimundo Braz-Filho; Edilberto Rocha Silveira; Mary Anne Sousa Lima

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
100 KB
Volume
49
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Two novel casbane diterpenes 1‐hydroxy‐(2__E__,6__Z__,12__E__)‐casba‐2,6,12‐triene‐4,5‐dione (1) and 6__E__,12__E__‐casba‐1,3,6,12‐tetraen‐1,4‐epoxy‐5‐one (2) were isolated from the ethanol extract of the stems of Croton argyrophyllus. Structural characterization including the relative stereochemistry of all compounds was established on the basis of spectroscopic methods, mainly 1D and 2D NMR, and HRESIMS. Copyright Β© 2011 John Wiley & Sons, Ltd.

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The known diterpenes junceic acid (1) and the stress metabolite derivatives 2È4 were isolated from the hexane extracts of the roots of Croton sarcopetalus Muell. The complete 13C NMR chemical shift assignments of these compounds were achieved with the aid of DEPT and HETCOR experiments.