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guaianolide/helianthus
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4 results
Sesquiterpene lactones and flavonoids from Helianthus species.
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From the leaves and the flowers of Helianthus glaucophyllus and Helianthus microcephalus, three new guaianolides were isolated. H. microcephalus afforded another two new guaianolides, the highly unsaturated guaianolide, the flavane, the flavone, and three flavonols. Structures of all the compounds
New chemical clues for broomrape-sunflower host-parasite interactions: synthesis of guaianestrigolactones.
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A comparative structure-activity relationship (SAR) study has been conducted with several guaianolide sesquiterpene lactones (SLs) as inducers of the germination of sunflower broomrape (Orobanche cumana) seeds. Compounds were selected and synthesized to study the influence of the
Dehydrocostus lactone is exuded from sunflower roots and stimulates germination of the root parasite Orobanche cumana.
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The germination of the obligate root parasites of the Orobanchaceae depends on the perception of chemical stimuli from host roots. Several compounds, collectively termed strigolactones, stimulate the germination of the various Orobanche species, but do not significantly elicit germination of
Heliaquanoids A-E, Five Sesquiterpenoid Dimers from Inula helianthus-aquatica.
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Heliaquanoid A (1), the first exo-2,4-linked Diels-Alder adduct between a pseudoguaianolide dienophile and a guaianolide diene, and heliaquanoids B-E (2-5), four new 2,4-linked Diels-Alder adducts between a xanthanolide dienophile and a guaianolide diene, were isolated from stems and leaves of Inula
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