Results 221 to 230 of about 7,068 (252)
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Limonoids from Turraea floribunda
Phytochemistry, 1995Abstract Extracts of the root bark of Turraea floribunda have yielded four new limonoids of the havanensin class: 28-nor-4α-carbomethoxy-11β-acetoxy-12α-(2-methylbutanoyloxy)-14,15-deoxyhavanensin-1,7-diacetate; 28-nor-4α-carbomethoxy-11β-hydroxy-12α-(2-methylbutanoyloxy)-14,15-deoxyhavanensin-1,7-diacetate; 18-nor-4α-carbomethoxy-11β-acetoxy-12α ...
Hassanali, Ahmed +6 more
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Limonoids from Ekebergia capensis
Phytochemistry, 1998Abstract The hexane extract of the seed of Ekebergia capensis (Meliaceae) yielded the novel limonoids, capensolactones 1–3 and the previously isolated methyl 3α-hydroxy-3-deoxyangolensate. Structures were determined by 2D NMR, mass spectroscopy and chemical methods.
Dulcie A. Mulholland, Serge E. Iourine
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Limonoids from Aphanamixis polystacha
Phytochemistry, 1999The hexane extract of the seed of Aphanamixis polystacha (Meliaceae) has yielded kihadalactone A and three novel limonoids, rohituka-12, rohituka-13 and rohituka-14. The substitution at C-1 of polystachin has been re-assigned as α.
Dulcie A. Mulholland, Nesan Naidoo
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Limonoids from Trichilia hirta
Phytochemistry, 1992Abstract From the fruits and leaves of Trichilia hirta were isolated, besides sitosterol and sitostenone, two novel limonoids: methyl 11β-acetoxy-6-hydroxy-12α-(2-methylpropionyloxy)-3,7-dioxo-1,5,14,20,22-meliacapentaen-29-oate and methyl 11β-acetoxy-6,23-dihydroxy-12α-(2-methylpropionyloxy)-3,7,21-trioxo-1,5,14,20-meliacatetraen-29-oate.
Diógenes A.G. Cortez +4 more
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Meliaceous Limonoids: Chemistry and Biological Activities
Chemical Reviews, 2011Natural Science Foundation of China[30000213, 30370160, 30670214]; National Basic Research Program of China (973 Program)[2009CB522300]; Chinese Academy of ...
Qin-Gang, Tan, Xiao-Dong, Luo
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Limonoids from Trichilia havanensis
Phytochemistry, 1990Abstract The limonoids of the seeds of Trichilia havanensis were studied in two ripening stages. From the unripened seeds azadirone, havanensin triacetate and three new limonoids were isolated. The mature seeds contained havanesin triacetate and its hydroxy lactone derivative.
Carlos Arenas, Lydia Rodriguez-Hahn
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Tetrahedron, 1981
Abstract Five new limonoids were isolated from calamondin seeds: methyl deacetylnomilinate (7), calamin (9), retrocalamin (10), cyclocalamin (11), and methyl isoobacunoate diosphenol (13). Structures were assigned on the basis of 1H and 13CNMR spectra, and chemical conversions of 9 to 10, 11, and 13. These reactions are also biogenetically plausible.
R.D. Bennett, S. Hasegawa
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Abstract Five new limonoids were isolated from calamondin seeds: methyl deacetylnomilinate (7), calamin (9), retrocalamin (10), cyclocalamin (11), and methyl isoobacunoate diosphenol (13). Structures were assigned on the basis of 1H and 13CNMR spectra, and chemical conversions of 9 to 10, 11, and 13. These reactions are also biogenetically plausible.
R.D. Bennett, S. Hasegawa
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Journal of Chemical Crystallography, 1996
Chloroform/Methanol extraction of the bark ofCedrela salvadorensis (Meliaceae), followed by chromatography afforded the crystalline C28H34O7 terpene. The structure first proposed by spectroscopy is confirmed by this X-ray analysis as 7α-acetyloxy-14,15:21,23-diepoxy-4,4,8-trimethyl-d-homo-24-nor-17-oxachola-1,20,22-triene-3,16,-dione.
Rubén A. Toscano +3 more
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Chloroform/Methanol extraction of the bark ofCedrela salvadorensis (Meliaceae), followed by chromatography afforded the crystalline C28H34O7 terpene. The structure first proposed by spectroscopy is confirmed by this X-ray analysis as 7α-acetyloxy-14,15:21,23-diepoxy-4,4,8-trimethyl-d-homo-24-nor-17-oxachola-1,20,22-triene-3,16,-dione.
Rubén A. Toscano +3 more
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Eight New Limonoids from Turraea pubescens.
ChemInform, 2007AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Xiao-Ning Wang +5 more
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1968
The limonoid bitter principles are a class of C26 degraded triterpenes believed to arise as oxidation products of tetracyclic triterpenes. A second group of related bitter principles, the simaroubolides, occur as further breakdown products in this series (30, 55, 97).
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The limonoid bitter principles are a class of C26 degraded triterpenes believed to arise as oxidation products of tetracyclic triterpenes. A second group of related bitter principles, the simaroubolides, occur as further breakdown products in this series (30, 55, 97).
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