Details

Autor(en) / Beteiligte

• Macías, Francisco A
• Fernández, Adriana
• Varela, Rosa M
• Molinillo, José M. G
• Torres, Ascensión
• Alves, Pedro L. C. A

Titel

Sesquiterpene Lactones as Allelochemicals

Ist Teil von

• Journal of natural products (Washington, D.C.), 2006-05, Vol.69 (5), p.795-800

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

2006

Quelle

MEDLINE

Beschreibungen/Notizen

• Six new sesquiterpene lactones, annuolide H (3), helivypolides F, H−J (4, 11−13), and helieudesmanolide A (6), together with known compounds, were isolated from polar bioactive fractions of Helianthus annuus cv. SH-222 and Stella fresh leaf water extracts. Spectroscopic analysis of the new data for 1,2-anhydroniveusin A and 1-methoxy-4,5-dihydroniveusin A corrects some previous assignments. The compounds were tested using the etiolated wheat coleoptile bioassay, and the most active compounds were assayed in standard target species (STS) (Lepidium sativum, Allium cepa, Lactuca sativa, Lycopersicon esculentum, and Triticum aestivum) from 5 × 10-4 to 10-5 M. The most phytotoxic compounds were helivypolide F and 15-hydroxy-3-dehydrodeoxyfruticin, both of which have a carbonyl group at C-3 conjugated with two double bonds.