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  • Title: Chiral resolution and absolute configuration of a pair of rare racemic spirodienone sesquineolignans from Xanthium sibiricum.
    Author: Shi Y, Liu Y, Li Y, Li L, Qu J, Ma S, Yu S.
    Journal: Org Lett; 2014 Oct 17; 16(20):5406-9. PubMed ID: 25275854.
    Abstract:
    A pair of racemic spirodienone neolignan enantiomers, (±)-sibiricumin A, were isolated from the extract of the fruits of Xanthium sibiricum. The resolution of (+)- and (-)-sibiricumin A was achieved by chiral HPLC. The absolute configurations of the racemes were assigned by X-ray and by electronic circular dichroism (ECD). This experiment is the first unambiguous determination of the absolute configuration of spirodienone neolignan.
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