Abstract
Three new sesquiterpenoids, 7- epi-debneyol, 1-hydroxydebneyol and 8-hydroxydebneyol have been isolated, along with the phytoalexins capsidiol and debneyol, from cellulase-treated cell suspension cultures of Nicotiana tabacum. The identity of the new compounds was confirmed by 1H NMR analysis of a series of chemical derivatives and by chemical means. It is proposed that the hydrocarbon 4- epi-eremophila-9,11-diene is a common intermediate in the biosynthesis of all the named compounds and further that 8-hydroxydebneyol is the direct precursor of the phytoalexin cyclodebneyol.
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