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Bioactive N-isobutylamides from the flower buds of Spilanthes acmella
R S Ramsewak1, A J Erickson, M G Nair
1Department of Horticulture, Michigan State University, East Lansing 48824, USA.
Phytochemistry
|July 2, 1999
Abstract:
The hexane extract of dried flower buds of Spilanthes acmella afforded three N-isobutyl amides: spilanthol, undeca-2E,7Z,9E-trienoic acid isobutylamide and undeca-2E-en-8,10-diynoic acid isobutylamide. Their structures were determined by 1H and 13C NMR, MS and GC-MS spectroscopic methods. All were active against Aedes aegyptii larvae and Helicoverpa zea neonates at 12.5 and 250 micrograms/mL concentrations, respectively.