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Antifeedant neo-clerodanes from Teucrium tomentosum Heyne. (Labiatae)
G N Krishna Kumari1, S Aravind, J Balachandran
1T. R. Govindachari Centre for Natural Products, SPIC Science Foundation, 88, Mount Road, Chennai-600 032, India. gnkrishna@hotmail.com
Phytochemistry
|October 22, 2003
Abstract:
From the acetone extract of Teucrium tomentosum, a new antifeedant neo-clerodane diterpenoid teuctosin (1) was isolated along with teuflin (2), teucrin-H(2) (3), 6beta-hydroxyteuscordin (4), 6beta-acetylteuscordin (5) and montanin-D (6). The structure of the new compound was elucidated comprehensively using 1D and 2D NMR methods and confirmed by X-ray crystallography. All the compounds showed effective antifeedancy against Plutella xylostella and Spodoptera litura at 10 mug/cm(2) of leaf area.