Dehydrobrachylaenolide : an eudesmanetype sesquiterpene lactone

Rademeyer, Melanie; Van Heerden, Fanie R.; Van der Merwe, Marina M.

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Dehydrobrachylaenolide : an eudesmanetype sesquiterpene lactone

Rademeyer, Melanie; Van Heerden, Fanie R.; Van der Merwe, Marina M.

URI: http://hdl.handle.net/2263/12038

Date: 2009

Abstract:

The three-ring eudesmanolide, C15H16O3, is a natural product isolated from Dicoma anomala Sond. (Asteraceae). The compound contains an endo–exo cross conjugated methylenecyclohexenone ring with an envelope conformation transfused with cyclohexane and trans-annelated with an - methylene -lactone. The absolute structure was assigned by optical rotation measurements compared to those from the synthetic compound with known stereochemistry. The crystal packing is consolidated by C—H...O interactions.

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