Abstract
Five new clerodane diterpenoids along with ten known compounds were isolated from the underground parts of Solidago altissima L. Compounds 1–4 were rare ent-neo-clerodanes with the cis A/B ring and a trans-configuration between the methyl groups at C-8 and C-9. Compound 5 was identified as trans-neo-clerodane. Revised stereochemical configurations for two known compounds were proposed. Additionally, the stereochemical configurations of the four stereogenic carbons in the 6/6 fused A/B rings of the clerodane diterpenoids were elucidated via 13C NMR spectral analysis. This analysis validated the proposed structural revisions and suggested the reassignments of other clerodane diterpenoids.
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