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New skeletal sesquiterpenoids, caprariolides A-D, from Capraria biflora and their insecticidal activity
D O Collins1, W A Gallimore, W F Reynolds
1Department of Chemistry, University of the West Indies, Mona, Kingston 7, Jamaica, West Indies.
Journal of Natural Products
|November 23, 2000
Abstract:
Four structurally novel isomeric sesquiterpenes have been isolated from the aerial parts of Capraria biflora. Caprariolides A (1), B (2), C (3), and D (4) have been determined by NMR spectroscopy experiments to be the (3S,5S,9R), (3R,5S,9R), (3R,5R,9R), and (3S,5R, 9R) isomers of 7-(furan-3'-yl)-3,9-dimethyl-1-oxaspiro[4. 5]dec-6-en-2-one, respectively. Both 1 and 2 were found to exhibit insecticidal activity against adult Cylas formicarius elegantulus, one of the most destructive insect pests of the sweet potato, Ipomoea sp.