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New bicyclic [3.2.1] octane neolignan derivative from . | LitMetric
bicyclic [3.2.1] octane neolignans have garnered increasing interest, because of their unique structural features and biological activities. This study describes the isolation and identification of a new bicyclic octane neolignan obtained through fractionation of the crude extract of the stem of (Lauraceae family). The structure of bicyclic octane neolignan was determined through NMR analysis and mass spectrometry data.
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The ability of nature to produce structurally complex molecules makes the determination of the absolute configuration of natural products a challenging task. Although extensive NMR analysis generally allows for the reliable assignment of relative configurations, the assignments of absolute stereochemistry are commonly performed by empirical comparisons of optical rotation (OR) and/or electronic circular dichroism (ECD) data obtained for related molecules. Such an approach, however, may lead to misassignments and consequent error propagations.
Yunnan Normal University , Kunming, 650050, P. R. China.
Seven lignans were isolated from 70 % aqueous acetone extracts of the twigs and leaves of Horsfieldia kingii. Among these, new compounds 1-3 were identified by spectroscopic techniques, with horsfielenigans A and B (1 and 2) being particularly noteworthy for their rare β-benzylnaphthalene skeleton, where compound 1 contains an oxabicyclo[3,2,1]octane moiety. In vitro evaluation of bioactivity against nitric oxide (NO) production in LPS-activated RAW264.
The phytochemical investigation of the stem bark crude extract of (Lauraceae) led to the isolation of undescribed bicyclic [3.2.1] octane neolignans, and , characterized by unusual bicyclic patterns and two other known bicyclic neolignans and .
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