Antifeedant neo-clerodanes from Teucrium tomentosum Heyne. (Labiatae).
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.
T. R. Govindachari Centre for Natural Products, SPIC Science Foundation, 88, Mount Road, Chennai-600 032, India. gnkrishna@hotmail.com
G N
GN
Krishna Kumari
S
S
Aravind
J
J
Balachandran
M R
MR
Ganesh
S
S
Soundarya Devi
S S
SS
Rajan
R
R
Malathi
K
K
Ravikumar
D000818:Animals; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D045785:Diterpenes, Clerodane; D005247:Feeding Behavior / Q000187:drug effects; D007306:Insecticides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D015394:Molecular Structure; D009036:Moths / Q000187:drug effects; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry; D018411:Spodoptera / Q000187:drug effects; D031367:Teucrium / Q000737:chemistry*
D004224:Diterpenes; D045785:Diterpenes, Clerodane; D007306:Insecticides; D010936:Plant Extracts