Riaz M, Krohn K, Malik A, Flörke U. Limbetazulone: a New‘Decahydro-8-oxanaphtho[2,1-f]azulen-7-one’ Diterpenoid from
Ballota limbeta, and Occurence of Two Conformational Isomers in the Crystal.
Chem Biodivers 2004;
1:458-62. [PMID:
17191859 DOI:
10.1002/cbdv.200490038]
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Abstract
A new diterpenoid, limbetazulone (= (3S,4S,4aR,12bS)-1,2,3,4,4a,5,6,11,12,12b-decahydro-3-hydroxy-4-(hydroxymethyl)naphtho[1',2': 5,6]cyclohepta[1,2-b]furan-7(7H)-one; 1), with the very rare 'naphtho[2,1-f]azulene-7-one' skeleton, was isolated from the aerial parts of the Asian medicinal plant Ballota limbeta. Its structure was established by extensive spectroscopic investigations, especially 1D and 2D NMR. X-Ray diffraction studies showed the presence of two conformational isomers (1a and 1b) in the crystal.
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