Abstract
From the aerial parts of Vanclevea stylosa, 19 new kolavane diterpenoids were isolated as their methyl ester derivatives and two were also isolated as the free acids. Their structures were elucidated from the NMR and mass spectra and a few chemical transformations. All the compounds are kolavenol derivatives having a succinyloxy group either at C-17 or C-18, with widely differing C-9 side chains; in four cases carbons have been lost from this side chain. Three known flavonoids, identified as kaempferol 3,7,4′-trimethyl ether, quercetin 3,7,3′,4′-tetramethyl ether (retusine) and quercetin 3,3′-dimethyl ether, were also isolated.
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