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Publikationen - Natur- und Wirkstoffchemie

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Publikation

Thuy, T. T.; Ripperger, H.; Porzel, A.; Sung, T. V.; Adam, G.; Counlarins, limonoids and an alkaloid from Clausena excavata Phytochemistry 52, 511-516, (1999) DOI: 10.1016/S0031-9422(99)00122-3

In addition to a known alkaloid, some limonoids and coumarins, the new coumarins excavatins A–M have been isolated from Clausena excavata. Their structures have been assigned by NMR and CD investigations.
Publikation

Thuy, T. T.; Porzel, A.; Ripperger, H.; Sung, T. V.; Adam, G.; Bishordeninyl terpene alkaloids from Zanthoxylum avicennae Phytochemistry 50, 903-907, (1999) DOI: 10.1016/S0031-9422(98)00612-8

In addition to (−)-culantraramine and (−)-culantraraminol the bishordeninyl terpene alkaloids, (−)-culantraramine N-oxide, (−)-culantraraminol N-oxide and avicennamine, have been isolated from the leaves of Zanthoxylum avicennae. Their structures have been assigned by MS and especially by NMR investigations.
Publikation

Lien, T. P.; Ripperger, H.; Porzel, A.; Merzweiler, K.; Sung, T. V.; Adam, G.; Indole alkaloids from tabernaemontana bovina Phytochemistry 49, 1457-1461, (1998) DOI: 10.1016/S0031-9422(98)00127-7

In addition to (-)-mehranine, hecubine, ibogaine, ibogaline, 19R-epi voacristine, 20-hydroxyconopharyngine and pedunculine the novel indole alkaloids 3-oxomehranine and 14α,15β-dihydroxy-N-methylaspidospermine have been isolated from the leaves and stems of Tabernaemontana bovina. The structure of 3-oxomehranine has been assigned by NMR investigations, the structure of 14α,15β-dihydroxy-N-methylaspidospermine by X-ray analysis and their absolute configurations by circular dichroism.
Publikation

Lien, T. P.; Ripperger, H.; Porzel, A.; Sung, T. V.; Adam, G.; Constituents of Artocarpus tonkinensis Pharmazie 53, 353, (1998)

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Publikation

Thuy, T. T.; Porzel, A.; Ripperger, H.; Sung, T. V.; Adam, G.; Chalcones and ecdysteroids from Vitex leptobotrys Phytochemistry 49, 2603-2605, (1998) DOI: 10.1016/S0031-9422(98)00411-7

In addition to some known chalcones and ecdysteroids three new chalcones have been isolated from aerial parts of Vitex leptobotrys, the structures of which have been identified as 2′,4′-dihydroxy-4,6′-dimethoxychalcone, 4′-hydroxy-4,2′,6′-trimethoxychalcone and 4,2′,4′,β-tetrahydroxy-6′-methoxy-α,β-dihydrochalcone, respectively.
Publikation

Quan, T. D.; Porzel, A.; Ripperger, H.; Sung, T. V.; Adam, G.; Photochemistry of Artemisinin Derivatives Nat. Prod. Lett. 12, 151-159, (1998) DOI: 10.1080/10575639808048285

Photochemical reactivity of some oxoalkyl derivatives of dihydroartemisinin as well as the reaction of dihydroartemisinin with lead tetraacetate/iodine under visible light have been studied.
Publikation

Ripperger, H.; Porzel, A.; Steroidal alkaloid glycosides from Solanum suaveolens Phytochemistry 46, 1279-1282, (1997) DOI: 10.1016/S0031-9422(97)80027-1

In addition to khasianine, solamargine, xylosylsolamargine and solasonine, three steroidal alkaloid glycosides, solasuaveoline, dihydrosolasuaveoline and isosolasuaveoline, have been isolated from aerial parts of Solanum suaveolens. The structures have been assigned by NMR investigations as (25R)-3β-{O-β-d-glucopyranosyl-(1 → 2)-O-β-d-glucopyranosyl-(1 → 4)-[O-α-l-rhamnopyranosyl-(1 → 2)]-β-d-galactopyranosyloxy}-22αN-spirosol-5-ene, (25R)-3β-{O-β-d-glucopyranosyl-(1 → 2)-O-β-d-glucopyranosyl-(1 → 4)-[O-α-l-rhamnopyranosyl-(1 → 2)]-β-d-galactopyranosyloxy}-5α,22αN-spirosolane and (25R)-3β-{O-β-d-glucopyranosyl-(1 → 6)-O-β-d-glucopyranosyl-(1 → 3)-[O-α-l-rhamnopyranosyl-(1 → 2)]-β-d-galactopyranosyloxy}-22αN-spirosol-5-ene, respectively.
Publikation

Anh, N. H.; Ripperger, H.; Porzel, A.; Sung, T. V.; Adam, G.; Tetralones from Ancistrocladus cochinchinensis Phytochemistry 44, 549-551, (1997) DOI: 10.1016/S0031-9422(96)00510-9

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Publikation

Anh, N. H.; Ripperger, H.; Porzel, A.; Sung, T. V.; Adam, G.; Neolignans from Caryodaphnopsis baviensis Phytochemistry 46, 569-571, (1997) DOI: 10.1016/S0031-9422(97)00209-4

Besides the eupomatenoids 1, 3, 5 and 6, 5-(erythro-1,2-dihydroxypropyl)-2-(4-hydroxyphenyl)-3-methylbenzo[b]furan, 5-(erythro-1,2-dihydroxypropyl)-2-(4-hydroxy-3-methoxyphenyl)-3-methylbenzo[b]furan, (2R,3R)-2,3-dihydro-2-(4-hydroxyphenyl)-3-methyl-5-[(E)-1-propenyl]benzo[b]furan, erythro-1-(3,4-methylenedioxyphenyl)-2-{4-[(E)-1-propenyl]phenoxy}propan-1-ol, (+)-sesamin, isolinderanolide and icariside D1, two new neolignans have been isolated from Caryodaphnopsis baviensis. Their structures were elucidated as 3-methyl-2-(3,4-methylenedioxyphenyl)-5-[(E)-3-oxo-1-propenyl]benzo[b]furan and 4-hydroxy-α-{4-[(E)-1-propenyl]phenoxy}propiophenone.
Publikation

Anh, N. H.; Porzel, A.; Ripperger, H.; Bringmann, G.; Schäffer, M.; God, R.; Van Sung, T.; Adam, G.; Naphthylisoquinoline alkaloids from Ancistrocladus cochinchinensis Phytochemistry 45, 1287-1291, (1997) DOI: 10.1016/S0031-9422(97)00110-6

From the leaves of Ancistrocladus cochinchinensis, besides the already known ancistrocladinine, the new naturally occurring alkaloids, 6-O-methylhamateine, hamatinine, 6-O-methylhamatinine, 6-O-demethyl-7-epi-ancistrobrevine D, 7-epi- ancistrobrevine D and 6-O-demethyl-8-O-methyl-7-epi-ancistrobrevine D have been isolated and their structures elucidated from spectroscopic data and chemical degradation.
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