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Labdane diterpenes of
Leonurus sibiricus.
Boalino DM, McLean S, Reynolds
WF, Tinto WF.
Laboratory of Bioorganic Chemistry, Department
of Biological and Chemical Sciences, University of the West Indies, Cave
Hill Campus, Bridgetown, Barbados.
Seven new labdane diterpenes,
sibiricinones A-E (1-4, 6) and 15-epi-sibiricinones D and E (5 and 7),
and the flavone genkwanin were isolated from the aerial parts of
Leonurus sibiricus. Sibiricinone D (4) and 15-epi-sibiricinone D (5),
and sibiricinone E (6) and 15-epi-sibiricinone E (7), respectively, were
isolated as C-15 epimeric pairs. These secondary metabolites were
identified on the basis of 1D and 2D NMR including (1)H-(1)H COSY, HSQC,
and HMBC spectroscopic techniques. The stereochemical configurations of
compounds 4-7 were assigned through 2D T-ROESY and selective NOE
experiments.
PMID: 15104513 [PubMed - indexed for MEDLINE]
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