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Bringmann G, Dreyer M, Kopff H, Rischer H, Wohlfarth M, Hadi HA, Brun R, Meimberg H, Heubl G. ent-Dioncophylleine A and related dehydrogenated naphthylisoquinoline alkaloids, the first Asian dioncophyllaceae-type alkaloids, from the "new"plant species Ancistrocladus benomensis. J Nat Prod 2005; 68:686-90. [PMID: 15921410 DOI: 10.1021/np049626j] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Three new fully dehydrogenated naphthylisoquinoline alkaloids, the 7,1'-coupled ent-dioncophylleine A (3a), the likewise 7,1'-coupled 5'-O-demethyl-ent-dioncophylleine A (4), and the 7,8'-linked dioncophylleine D (5), have been isolated from the leaves of the recently described Malaysian highland liana Ancistrocladusbenomensis. All of them lack an oxygen function at C-6; this so-called Dioncophyllaceae-type structural subclass had previously been found only in naphthylisoquinoline alkaloids from West and Central African plants. Moreover, compounds 3a and 4 are the first fully dehydrogenated, i.e., only axially chiral, naphthylisoquinoline alkaloids of this type that are optically active; compound 5, by contrast, is fully racemic, due to its configurationally unstable biaryl axis. The structural elucidation was achieved by spectroscopic and chiroptical methods. Biological activities of these alkaloids against different protozoan parasites are described.
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Affiliation(s)
- Gerhard Bringmann
- Institut für Organische Chemie der Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Bringmann G, Dreyer M, Rischer H, Wolf K, Hadi HA, Brun R, Meimberg H, Heubl G. Ancistrobenomine a, the first naphthylisoquinoline oxygenated at Me-3, and related 5,1'-coupled alkaloids, from the "new" plant species ancistrocladusbenomensis. J Nat Prod 2004; 67:2058-2062. [PMID: 15620251 DOI: 10.1021/np0497651] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Three new 5,1'-coupled naphthylisoquinoline alkaloids, ancistrobenomine A (1), 6-O-demethylancistrobenomine A (2), and 5'-O-demethylancistrocline (3), have been isolated from the stem bark of a botanically as yet undescribed highland liana Ancistrocladus sp., proposed to be named "A. benomensis" according to the region in Peninsular Malaysia where it has been discovered on the mountain of Gunung Benom. Two of the compounds possess an unprecedented structure with a novel hydroxymethylene group at C-3 of the fully dehydrogenated isoquinoline moiety. The structural elucidation was achieved by chemical, spectroscopic, and chiroptical methods. As typical of the so-called Ancistrocladaceae type, all of the compounds isolated bear an oxygen at C-6. Biological activities of these alkaloids against different protozoic pathogens are described.
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Affiliation(s)
- Gerhard Bringmann
- Institut für Organische Chemie der Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Häkkinen ST, Rischer H, Laakso I, Maaheimo H, Seppänen-Laakso T, Oksman-Caldentey KM. Anatalline and other methyl jasmonate-inducible nicotine alkaloids from Nicotiana tabacum cv. By-2 cell cultures. Planta Med 2004; 70:936-41. [PMID: 15490322 DOI: 10.1055/s-2004-832620] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Anatalline [2,4-di(3-pyridyl)piperidine] accumulation was shown to be induced by methyl jasmonate in Nicotiana tabacum cv. BY-2 cell cultures. Beside anatabine, anatalline represented the most abundant alkaloid, moreover, it was always present in two isomeric forms occurring always in similar concentrations. Both isomers could be completely separated by GC-MS. For structural analysis, the isolation of both isomers was performed using a semi-preparative HPLC system. The structures of anatalline [cis-2,4-di(3-pyridyl)piperidine] and its stereoisomer trans-2,4-di(3-pyridyl)piperidine were confirmed by MS and 1D and 2D NMR spectral data. The biosynthetic origin of anatalline was studied by feeding alkaloid precursors to BY-2 cell cultures.
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Bringmann G, Wohlfarth M, Rischer H, Schlauer J, Brun R. Extract screening by HPLC coupled to MS-MS, NMR, and CD: a dimeric and three monomeric naphthylisoquinoline alkaloids from Ancistrocladus griffithii. Phytochemistry 2002; 61:195-204. [PMID: 12169315 DOI: 10.1016/s0031-9422(02)00217-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Three new monomeric naphthylisoquinoline alkaloids, ancistrogriffines A, B, and C, and the first dimer of a 7,8'-coupled naphthylisoquinoline, ancistrogriffithine A, have been detected by phytochemical online screening of plant extracts of Ancistrocladus griffithii, using the analytical 'triad' HPLC-MS/MS, HPLC-NMR, and HPLC-CD. Ancistrogriffithine A, as well as ancistrogriffines A and C, were structurally completely assigned (including the absolute configuration) right from the extract, without previous isolation. Furthermore, two related, but known alkaloids, ancistrocladine and hamatine, were identified. Except for ancistrogriffine B, which occurs in trace quantities only, all new alkaloids were then isolated preparatively and the initial assignments were fully confirmed by conventional offline methods. Of particular interest is the constitutionally and configurationally unprecedented structure of ancistrogriffithine A, which is simultaneously the first dimeric naphthylisoquinoline alkaloid from an Asian Ancistrocladus species. Ancistrogriffithine A and ancistrogriffine A are active against Plasmodium falciparum. Furthermore, the latter compound shows good activity against Leishmania donovani. The results demonstrate the ability of modern online methods like HPLC-NMR, -MS/MS, and -CD to serve as powerful tools for the reliable structural elucidation of even complex structures of trace compounds in crude biological matrices.
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Affiliation(s)
- Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074, Würzburg, Germany.
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Rischer H, Hamm A, Bringmann G. Nepenthes insignis uses a C2-portion of the carbon skeleton of L-alanine acquired via its carnivorous organs, to build up the allelochemical plumbagin. Phytochemistry 2002; 59:603-609. [PMID: 11867092 DOI: 10.1016/s0031-9422(02)00003-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Tropical pitcher plants (Nepenthes) catch animals in their specialized cup-shaped leaves, digest the prey by secreting enzymes, and actively take up the resulting compounds. The benefit of this behaviour is the ability to grow and compete in nutrient-poor habitats. Our present in vitro study shows that not only the nitrogen of alanine fed to the carnivorous organs is used by the plant but that in addition intact C2-units derived from C-2 and C-3 of stable isotope labelled L-alanine serve as building blocks, here exemplarily for the synthesis of the secondary metabolite plumbagin, a potent allelochemical. This result adds a new facet to the benefit of carnivory for plants. The availability of plumbagin by a de novo synthesis probably enhances the plants' fitness in their defence against phytophagous and pathogenic organisms. A missing specific uptake or CoA activation mechanism might be the reason that acetate fed to the pitchers was not incorporated into the naphthoquinone plumbagin. The dihydronaphthoquinone glucosides rossoliside and plumbaside A, here isolated for the first time from Nepenthes, by contrast, showed no incorporation after feeding of any of the two precursors, suggesting these compounds to be storage forms with probably very low turnover rates.
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Affiliation(s)
- Heiko Rischer
- Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
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Bringmann G, Wohlfarth M, Rischer H, Heubes M, Saeb W, Diem S, Herderich M, Schlauer J. A photometric screening method for dimeric naphthylisoquinoline alkaloids and complete on-line structural elucidation of a dimer in crude plant extracts, by the LC-MS/LC-NMR/LC-CD triad. Anal Chem 2001; 73:2571-7. [PMID: 11403302 DOI: 10.1021/ac001503q] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient evaluation procedure for the chemical screening and on-line structural elucidation of dimeric naphthylisoquinoline alkaloids has been developed. The method is based on the lead tetraacetate oxidation of the central binaphthalene core of the alkaloids. UV spectra of the extracts after addition of the oxidant show, in the presence of naphthylisoquinoline dimers, the appearance of a characteristic long-wavelength absorption indicative of dinaphthoquinones. The efficiency and relevance of the method has been demonstrated in the discovery of a constitutionally and configurationally new dimeric naphthylisoquinoline alkaloid, named ancistrogriffithine A (4), from the previously uninvestigated Asian liana Ancistrocladus griffithii. After verification of this screening result by LC-ESI-MS/MS, the constitution and the relative configuration of the compound were elucidated on line, by LC-NMR and LC-CD on the extract. Using an LC-NMR-WET-ROESY experiment, itwas possible for the first time to determine the relative axial configuration of a natural biaryl compound on line, by observing long-range ROE interactions. Finally, an oxidative degradation right on the extract delivered the absolute configuration of 4, without isolation of the alkaloid. Ancistrogriffithine A is the as yet only dimeric naphthylisoquinoline from an Asian Ancistrocladaceae plant.
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Affiliation(s)
- G Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, Germany.
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Bringmann G, Rischer H, Wohlfarth M, Schlauer J. Biosynthesis of Antidesmone in Cell Cultures of Antidesma membranaceum (Euphorbiaceae): An Unprecedented Class of Glycine-Derived Alkaloids. J Am Chem Soc 2000. [DOI: 10.1021/ja001391k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Gerhard Bringmann
- Contribution from the Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Heiko Rischer
- Contribution from the Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Michael Wohlfarth
- Contribution from the Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Jan Schlauer
- Contribution from the Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
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Bringmann G, Schlauer J, Rischer H, Wohlfarth M, Mühlbacher J, Buske A, Porzel A, Schmidt J, Adam G. Revised Structure of Antidesmone, an Unusual Alkaloid from Tropical Antidesma Plants (Euphorbiaceae). Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00289-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Bringmann G, Wohlfarth M, Rischer H, Grüne M, Schlauer J. A New Biosynthetic Pathway to Alkaloids in Plants: Acetogenic Isoquinolines We thank Dr. D. Marek and Dr. D. Moskau (Bruker AG, Fällanden, Switzerland), who made the cryoprobe technique available to us, Prof. L. Aké Assi (Centre National de Floristique, Abidjan Ivory Coast) for a long and fruitful collaboration on Dioncophyllaceae and Ancistrocladaceae plants, and Dr. D. Scheutzow (Universität Würzburg) for valuable advice. This work was supported by the Deutsche Forschungsgemeinschaft (SFB 251 and Graduiertenkolleg "NMR in vivo und in vitro"), by the Fonds der Chemischen Industrie, and by the Max-Buchner-Stiftung. Angew Chem Int Ed Engl 2000. [PMID: 10777643 DOI: 10.1002/(sici)1521-3773(20000417)39:83.0.co;2-#] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Affiliation(s)
- G Bringmann
- Institut für Organische Chemie Universität Würzburg Am Hubland, 97074 Würzburg (Germany)
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Bringmann G, Wohlfarth M, Rischer H, Grüne M, Schlauer J. A New Biosynthetic Pathway to Alkaloids in Plants: Acetogenic Isoquinolines We thank Dr. D. Marek and Dr. D. Moskau (Bruker AG, Fällanden, Switzerland), who made the cryoprobe technique available to us, Prof. L. Aké Assi (Centre National de Floristique, Abidjan Ivory Coast) for a long and fruitful collaboration on Dioncophyllaceae and Ancistrocladaceae plants, and Dr. D. Scheutzow (Universität Würzburg) for valuable advice. This work was supported by the Deutsche Forschungsgemeinschaft (SFB 251 and Graduiertenkolleg "NMR in vivo und in vitro"), by the Fonds der Chemischen Industrie, and by the Max-Buchner-Stiftung. Angew Chem Int Ed Engl 2000; 39:1464-1466. [PMID: 10777643 DOI: 10.1002/(sici)1521-3773(20000417)39:8<1464::aid-anie1464>3.0.co;2-#] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- G Bringmann
- Institut für Organische Chemie Universität Würzburg Am Hubland, 97074 Würzburg (Germany)
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Bringmann G, Rischer H, Wohlfarth M, Schlauer J, Assi LA. Droserone from cell cultures of Triphyophyllum peltatum (Dioncophyllaceae) and its biosynthetic origin. Phytochemistry 2000; 53:339-343. [PMID: 10703054 DOI: 10.1016/s0031-9422(99)00543-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The growth and droserone content of callus cultures of Triphyophyllum peltatum grown in liquid 1/5 Linsmaier and Skoog medium was studied. During a lag phase in growth, droserone concentrations in the medium reached a value of 2.1 mg g-1 fr. wt. After this maximum value the concentration decreased slightly to 1.8 mg g-1 fr. wt., while the growth of the calli was enhanced (25% increase in fr. wt. within 7 days). Plumbagin and isoshinanolone were likewise present in the medium. By feeding 13C2-labelled acetate to the cultures the biosynthesis of droserone was elucidated. The incorporation of whole C2-units unambiguously shows its acetogenic origin and fits well in the biosynthetic scheme suggested for the structurally--and biogenetically--related naphthylisoquinoline alkaloids.
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Affiliation(s)
- G Bringmann
- Institut für Organische Chemie der Universität, Universität Würzburg, Germany.
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Bringmann G, Wohlfarth M, Rischer H, Rückert M, Schlauer J. The polyketide folding mode in the biogenesis of isoshinanolone and plumbagin from Ancistrocladus heyneanus (Ancistrocladaceae). Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)01935-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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