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Feineis D, Bringmann G. Structural variety and pharmacological potential of naphthylisoquinoline alkaloids. THE ALKALOIDS. CHEMISTRY AND BIOLOGY 2024; 91:1-410. [PMID: 38811064 DOI: 10.1016/bs.alkal.2024.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2024]
Abstract
Naphthylisoquinoline alkaloids are a fascinating class of natural biaryl compounds. They show characteristic mono- and dimeric scaffolds, with chiral axes and stereogenic centers. Since the appearance of the last comprehensive overview on these secondary plant metabolites in this series in 1995, the number of discovered representatives has tremendously increased to more than 280 examples known today. Many novel-type compounds have meanwhile been discovered, among them naphthylisoquinoline-related follow-up products like e.g., the first seco-type (i.e., ring-opened) and ring-contracted analogues. As highlighted in this review, the knowledge on the broad structural chemodiversity of naphthylisoquinoline alkaloids has been decisively driven forward by extensive phytochemical studies on the metabolite pattern of Ancistrocladus abbreviatus from Coastal West Africa, which is a particularly "creative" plant. These investigations furnished a considerable number of more than 80-mostly new-natural products from this single species, with promising antiplasmodial activities and with pronounced cytotoxic effects against human leukemia, pancreatic, cervical, and breast cancer cells. Another unique feature of naphthylisoquinoline alkaloids is their unprecedented biosynthetic origin from polyketidic precursors and not, as usual for isoquinoline alkaloids, from aromatic amino acids-a striking example of biosynthetic convergence in nature. Furthermore, remarkable botanical results are presented on the natural producers of naphthylisoquinoline alkaloids, the paleotropical Dioncophyllaceae and Ancistrocladaceae lianas, including first investigations on the chemoecological role of these plant metabolites and their storage and accumulation in particular plant organs.
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Affiliation(s)
- Doris Feineis
- Institute of Organic Chemistry, University of Würzburg, Würzburg, Germany
| | - Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg, Würzburg, Germany.
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Feineis D, Bringmann G. Asian Ancistrocladus Lianas as Creative Producers of Naphthylisoquinoline Alkaloids. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2023; 119:1-335. [PMID: 36587292 DOI: 10.1007/978-3-031-10457-2_1] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
This book describes a unique class of secondary metabolites, the mono- and dimeric naphthylisoquinoline alkaloids. They occur in lianas of the paleotropical Ancistrocladaceae and Dioncophyllaceae families, exclusively. Their unprecedented structures include stereogenic centers and rotationally hindered, and thus likewise stereogenic, axes. Extended recent investigations on six Ancistrocladus species from Asia, as reported in this review, shed light on their fascinating phytochemical productivity, with over 100 such intriguing natural products. This high chemodiversity arises from a likewise unique biosynthesis from acetate-malonate units, following a novel polyketidic pathway to plant-derived isoquinoline alkaloids. Some of the compounds show most promising antiparasitic activities. Likewise presented are strategies for the regio- and stereoselective total synthesis of the alkaloids, including the directed construction of the chiral axis.
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Affiliation(s)
- Doris Feineis
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074, Würzburg, Germany.
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NMR-Based Chromatography Readouts: Indispensable Tools to “Translate” Analytical Features into Molecular Structures. Cells 2022; 11:cells11213526. [DOI: 10.3390/cells11213526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 10/29/2022] [Accepted: 11/04/2022] [Indexed: 11/09/2022] Open
Abstract
Gaining structural information is a must to allow the unequivocal structural characterization of analytes from natural sources. In liquid state, NMR spectroscopy is almost the only possible alternative to HPLC-MS and hyphenating the effluent of an analyte separation device to the probe head of an NMR spectrometer has therefore been pursued for more than three decades. The purpose of this review article was to demonstrate that, while it is possible to use mass spectrometry and similar methods to differentiate, group, and often assign the differentiating variables to entities that can be recognized as single molecules, the structural characterization of these putative biomarkers usually requires the use of NMR spectroscopy.
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Tajuddeen N, Bringmann G. N, C-Coupled naphthylisoquinoline alkaloids: a versatile new class of axially chiral natural products. Nat Prod Rep 2021; 38:2154-2186. [PMID: 34212956 DOI: 10.1039/d1np00020a] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Covering: up to April 2021During the past decades, a plethora of natural products with restricted rotation about a biaryl axis have been discovered, among them the naphthylisoquinoline (NIQ) alkaloids, mostly C,C-coupled and having remarkable bioactivities. Within this fascinating class of naturally occurring biaryl compounds, NIQ alkaloids bearing an N,C-heterobiaryl axis have attracted particular attention. They are structurally and biosynthetically unprecedented, with interesting stereochemical implications and biological activities. In contrast to existing articles and reviews about axially chiral - yet C,C-coupled - natural products, this is the first, comprehensive review on the new subclass of N,C-coupled NIQs, their isolation and structural elucidation, their N,C-axial chirality, their biosynthetic origin, their promising antiparasitic and antileukemic activities, and their total synthesis.
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Affiliation(s)
- Nasir Tajuddeen
- Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria
| | - Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Salem MA, Perez de Souza L, Serag A, Fernie AR, Farag MA, Ezzat SM, Alseekh S. Metabolomics in the Context of Plant Natural Products Research: From Sample Preparation to Metabolite Analysis. Metabolites 2020; 10:E37. [PMID: 31952212 PMCID: PMC7023240 DOI: 10.3390/metabo10010037] [Citation(s) in RCA: 119] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 12/25/2019] [Accepted: 01/11/2020] [Indexed: 12/22/2022] Open
Abstract
Plant-derived natural products have long been considered a valuable source of lead compounds for drug development. Natural extracts are usually composed of hundreds to thousands of metabolites, whereby the bioactivity of natural extracts can be represented by synergism between several metabolites. However, isolating every single compound from a natural extract is not always possible due to the complex chemistry and presence of most secondary metabolites at very low levels. Metabolomics has emerged in recent years as an indispensable tool for the analysis of thousands of metabolites from crude natural extracts, leading to a paradigm shift in natural products drug research. Analytical methods such as mass spectrometry (MS) and nuclear magnetic resonance (NMR) are used to comprehensively annotate the constituents of plant natural products for screening, drug discovery as well as for quality control purposes such as those required for phytomedicine. In this review, the current advancements in plant sample preparation, sample measurements, and data analysis are presented alongside a few case studies of the successful applications of these processes in plant natural product drug discovery.
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Affiliation(s)
- Mohamed A. Salem
- Department of Pharmacognosy, Faculty of Pharmacy, Menoufia University, Gamal Abd El Nasr st., Shibin Elkom, Menoufia 32511, Egypt
| | - Leonardo Perez de Souza
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany; (L.P.d.S.); (A.R.F.)
| | - Ahmed Serag
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Al-Azhar University, Cairo 11751, Egypt;
| | - Alisdair R. Fernie
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany; (L.P.d.S.); (A.R.F.)
- Center of Plant Systems Biology and Biotechnology (CPSBB), Plovdiv 4000, Bulgaria
| | - Mohamed A. Farag
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt; (M.A.F.); (S.M.E.)
- Chemistry Department, School of Sciences & Engineering, The American University in Cairo, New Cairo 11835, Egypt
| | - Shahira M. Ezzat
- Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt; (M.A.F.); (S.M.E.)
- Department of Pharmacognosy, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), Giza 11787, Egypt
| | - Saleh Alseekh
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany; (L.P.d.S.); (A.R.F.)
- Center of Plant Systems Biology and Biotechnology (CPSBB), Plovdiv 4000, Bulgaria
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Fayez S, Li J, Feineis D, Aké Assi L, Kaiser M, Brun R, Anany MA, Wajant H, Bringmann G. A Near-Complete Series of Four Atropisomeric Jozimine A 2-Type Naphthylisoquinoline Dimers with Antiplasmodial and Cytotoxic Activities and Related Alkaloids from Ancistrocladus abbreviatus. JOURNAL OF NATURAL PRODUCTS 2019; 82:3033-3046. [PMID: 31642313 DOI: 10.1021/acs.jnatprod.9b00589] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Three new naphthylisoquinoline dimers, jozibrevines A-C (1a-c), were isolated from the West African shrub Ancistrocladus abbreviatus, along with the known dimer jozimine A2 (1d). The two molecular moieties of 1a-d are coupled via the sterically constrained 3',3″-positions of their two naphthalene units, so that the central biaryl linkage is rotationally hindered. With the two outer axes also being chiral, 1a-d possess three consecutive stereogenic axes. The four isolated dimers all have the same constitutions and identical absolute configurations at the four stereogenic centers, but differ by their axial chirality. They belong to the extremely small class of Dioncophyllaceae-type naphthylisoquinoline dimers, i.e., being devoid of oxygen functions at C-6 and bearing the R-configuration at C-3 in their isoquinoline portions. Besides these dimers, the plant produces predominantly typical Ancistrocladaceae-type monomeric compounds, i.e., with the S-configuration at C-3 and an oxygen function at C-6, such as the new ancistrobrevines K (5) and L (6). Furthermore, a new hybrid-type (i.e., mixed Ancistrocladaceae/Dioncophyllaceae-type) alkaloid was identified, named ancistrobrevine M (7), which is 3R-configured and 6-oxygenated. Remarkable was the discovery of its "inverse hybrid-type" counterpart, dioncoline A (8). It is the as yet only known 3S-configured naphthylisoquinoline lacking an O-functionality at C-6. The new jozibrevines A-C (1a-c) exhibited pronounced antiplasmodial activities in the submicromolar range, with 1a being the most potent compound (IC50, 0.012 μM). Furthermore, jozimine A2 (1d) showed cytotoxicity against human colon carcinoma (HT-29), fibrosarcoma (HT1080), and multiple myeloma (MM.1S) cancer cells, displaying IC50 values of 12.0, 9.0, and 5.0 μM, respectively, whereas jozibrevines A (1a) and B (1b) were nontoxic in this concentration range.
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Affiliation(s)
- Shaimaa Fayez
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
- Department of Pharmacognosy, Faculty of Pharmacy , Ain-Shams University , Organization of African Unity Street 1 , 11566 Cairo , Egypt
| | - Jun Li
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
- State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization and Key Laboratory of Plant Resources and Chemistry of Arid Zone, Xinjiang Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Urumqi , 830011 , People's Republic of China
| | - Doris Feineis
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
| | - Laurent Aké Assi
- Centre National de Floristique, Conservatoire et Jardin Botaniques , Université d' Abidjan , Abidjan 08, Ivory Coast
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute , Socinstrasse 57 , CH-4002 Basel , Switzerland
- University of Basel , Petersplatz 1 , CH-4003 Basel , Switzerland
| | - Reto Brun
- Swiss Tropical and Public Health Institute , Socinstrasse 57 , CH-4002 Basel , Switzerland
- University of Basel , Petersplatz 1 , CH-4003 Basel , Switzerland
| | - Mohamed A Anany
- Division of Molecular Internal Medicine, Department of Internal Medicine II , University Hospital Würzburg , Grombühlstraße 12 , D-97080 Würzburg , Germany
- Division of Genetic Engineering and Biotechnology, Department of Microbial Biotechnology , National Research Centre , El Buhouth Street, Dokki , 12622 Giza , Egypt
| | - Harald Wajant
- Division of Molecular Internal Medicine, Department of Internal Medicine II , University Hospital Würzburg , Grombühlstraße 12 , D-97080 Würzburg , Germany
| | - Gerhard Bringmann
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
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Tshitenge DT, Bruhn T, Feineis D, Schmidt D, Mudogo V, Kaiser M, Brun R, Würthner F, Awale S, Bringmann G. Ealamines A-H, a Series of Naphthylisoquinolines with the Rare 7,8'-Coupling Site, from the Congolese Liana Ancistrocladus ealaensis, Targeting Pancreatic Cancer Cells. JOURNAL OF NATURAL PRODUCTS 2019; 82:3150-3164. [PMID: 31630523 DOI: 10.1021/acs.jnatprod.9b00755] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
From the twigs and leaves of the Central African liana Ancistrocladus ealaensis (Ancistrocladaceae), a series of ten 7,8'-coupled naphthylisoquinoline alkaloids were isolated, comprising eight new compounds, named ealamines A-H (4a, 4b, 5-10), and two known ones, 6-O-demethylancistrobrevine A (11) and yaoundamine A (12), which had previously been found in related African Ancistrocladus species. Only one of the new compounds within this series, ealamine H (10), is a typical Ancistrocladaceae-type alkaloid, with 3S-configuration at C-3 and an oxygen function at C-6, whereas seven of the new alkaloids are the first 7,8'-linked "hybrid-type" naphthylisoquinoline alkaloids, i.e., 3R-configured and 6-oxygenated in the tetrahydroisoquinoline part. The discovery of such a broad series of 7,8'-coupled naphthyltetrahydroisoquinolines is unprecedented, because representatives of this subclass of alkaloids are normally found in Nature quite rarely. The stereostructures of the new ealamines were assigned by HRESIMS, 1D and 2D NMR, oxidative degradation, and experimental and quantum-chemical ECD investigations, and-in the case of ealamine A (4a)-also confirmed by X-ray diffraction analysis. Ealamines A-D exhibited distinct-and specific-antiplasmodial activities, and they displayed pronounced preferential cytotoxic effects toward PANC-1 human pancreatic cancer cells in nutrient-deprived medium, without causing toxicity under normal, nutrient-rich conditions, with ealamine C (5) as the most potent agent.
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Affiliation(s)
- Dieudonné Tshitenge Tshitenge
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
- Faculty of Pharmaceutical Sciences , University of Kinshasa , B.P. 212 Kinshasa XI, Democratic Republic of the Congo
- Medicinal Chemistry , Bayer AG, Pharmaceuticals , Aprather Weg 18a , D-42096 Wuppertal , Germany
| | - Torsten Bruhn
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
- Federal Institute for Risk Assessment , Max-Dohrn-Straße 8-10 , D-10589 Berlin , Germany
| | - Doris Feineis
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
| | - David Schmidt
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
| | - Virima Mudogo
- Faculté des Sciences , Université de Kinshasa , B.P. 202 , Kinshasa XI, Democratic Republic of the Congo
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute , Socinstrasse 57 , CH-4002 Basel , Switzerland
- University of Basel , Petersplatz 1 , CH-4003 Basel , Switzerland
| | - Reto Brun
- Swiss Tropical and Public Health Institute , Socinstrasse 57 , CH-4002 Basel , Switzerland
- University of Basel , Petersplatz 1 , CH-4003 Basel , Switzerland
| | - Frank Würthner
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
| | - Suresh Awale
- Division of Natural Drug Discovery, Institute of Natural Medicine , University of Toyama , 2630 Sugitani , Toyama 930-0194 , Japan
| | - Gerhard Bringmann
- Institute of Organic Chemistry , University of Würzburg , Am Hubland , D-97074 Würzburg , Germany
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Lombe BK, Feineis D, Bringmann G. Dimeric naphthylisoquinoline alkaloids: polyketide-derived axially chiral bioactive quateraryls. Nat Prod Rep 2019; 36:1513-1545. [DOI: 10.1039/c9np00024k] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This is the first review on dimeric naphthylisoquinolines, a group of structurally intriguing, biosynthetically unique, and pharmacologically promising alkaloids.
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Affiliation(s)
- Blaise Kimbadi Lombe
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
- Faculté des Sciences
| | - Doris Feineis
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Gerhard Bringmann
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
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Li J, Seupel R, Bruhn T, Feineis D, Kaiser M, Brun R, Mudogo V, Awale S, Bringmann G. Jozilebomines A and B, Naphthylisoquinoline Dimers from the Congolese Liana Ancistrocladus ileboensis, with Antiausterity Activities against the PANC-1 Human Pancreatic Cancer Cell Line. JOURNAL OF NATURAL PRODUCTS 2017; 80:2807-2817. [PMID: 29043798 DOI: 10.1021/acs.jnatprod.7b00650] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Two new naphthylisoquinoline dimers, jozilebomines A (1a) and B (1b), were isolated from the roots of the Congolese plant Ancistrocladus ileboensis, along with the known dimer jozimine A2 (2). These compounds are Dioncophyllaceae-type metabolites, i.e., lacking oxygen functions at C-6 and with an R-configuration at C-3 in their tetrahydroisoquinoline moieties. The dimers 1a and 1b consist of two 7,1'-coupled naphthylisoquinoline monomers linked through an unprecedented 3',6″-coupling in the binaphthalene core and not, as in 2, via the C-3-positions of the two naphthalene units. Thus, different from the C2-symmetric jozimine A2 (2), the new jozilebomines are constitutionally unsymmetric. The central biaryl axis of each of the three dimers is rotationally hindered, so that 1a, 1b, and 2 possess three consecutive chiral axes. The two jozilebomines have identical constitutions and the same absolute configurations at all four stereogenic centers, but differ from each other in their axial chirality. Their structural elucidation was achieved by HRESIMS, 1D and 2D NMR, oxidative degradation, and experimental and calculated ECD data. They exhibited distinct and specific antiplasmodial activities. All dimers showed potent cytotoxicity against HeLa human cervical cancer cells and preferential cytotoxicity against PANC-1 human pancreatic cancer cells under nutrition-deprived conditions. Furthermore, these dimers significantly inhibited the colony formation of PANC-1 cells, even when exposed to noncytotoxic concentration for a short time. Jozilebomines A (1a) and B (1b) and jozimine A2 (2) represent novel potential candidates for future drug development against pancreatic cancer.
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Affiliation(s)
- Jun Li
- Institute of Organic Chemistry, University of Würzburg , Am Hubland, D-97074 Würzburg, Germany
- State Key Laboratory Basis of Xinjiang Indigenous Medicinal Plants Resource Utilization, and Key Laboratory of Plant Resources and Chemistry of Arid Zone, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Urumqi, 830011, People's Republic of China
| | - Raina Seupel
- Institute of Organic Chemistry, University of Würzburg , Am Hubland, D-97074 Würzburg, Germany
| | - Torsten Bruhn
- Institute of Organic Chemistry, University of Würzburg , Am Hubland, D-97074 Würzburg, Germany
- Federal Institute for Risk Assessment , Max-Dohrn-Straße 8-10, D-10589 Berlin, Germany
| | - Doris Feineis
- Institute of Organic Chemistry, University of Würzburg , Am Hubland, D-97074 Würzburg, Germany
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute , Socinstrasse 57, CH-4002 Basel, Switzerland
- University of Basel , Petersplatz 1, CH-4003 Basel, Switzerland
| | - Reto Brun
- Swiss Tropical and Public Health Institute , Socinstrasse 57, CH-4002 Basel, Switzerland
- University of Basel , Petersplatz 1, CH-4003 Basel, Switzerland
| | - Virima Mudogo
- Faculté des Sciences, Université de Kinshasa , B.P. 202, Kinshasa XI, Democratic Republic of the Congo
| | - Suresh Awale
- Division of Natural Drug Discovery, Institute of Natural Medicine, University of Toyama , 2630 Sugitani, Toyama 930-0194, Japan
| | - Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg , Am Hubland, D-97074 Würzburg, Germany
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Tshitenge DT, Feineis D, Mudogo V, Kaiser M, Brun R, Bringmann G. Antiplasmodial Ealapasamines A-C,'Mixed' Naphthylisoquinoline Dimers from the Central African Liana Ancistrocladus ealaensis. Sci Rep 2017; 7:5767. [PMID: 28720905 PMCID: PMC5515985 DOI: 10.1038/s41598-017-05719-w] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 06/01/2017] [Indexed: 11/10/2022] Open
Abstract
Three unusual heterodimeric naphthylisoquinoline alkaloids, named ealapasamines A-C (1-3), were isolated from the leaves of the tropical plant Ancistrocladus ealaensis J. Léonard. These 'mixed', constitutionally unsymmetric dimers are the first stereochemically fully assigned cross-coupling products of a 5,8'- and a 7,8'-coupled naphthylisoquinoline linked via C-6' in both naphthalene portions. So far, only two other West and Central Ancistrocladus species were known to produce dimers with a central 6,6″-axis, yet, in contrast to the ealapasamines, usually consisting of two 5,8'-coupled monomers, like e.g., in michellamine B. The new dimers 1-3 contain six elements of chirality, four stereogenic centers and the two outer axes, while the central biaryl axis is configurationally unstable. The elucidation of the complete stereostructures of the ealapasamines was achieved by the interplay of spectroscopic methods including HRESIMS, 1D and 2D NMR (in particular ROESY measurements), in combination with chemical (oxidative degradation) and chiroptical (electronic circular dichroism) investigations. The ealapasamines A-C display high antiplasmodial activities with excellent half-maximum inhibition concentration values in the low nanomolar range.
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Affiliation(s)
- Dieudonné Tshitenge Tshitenge
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074, Würzburg, Germany
- Faculty of Pharmaceutical Sciences, University of Kinshasa, B.P. 212, Kinshasa XI, Democratic Republic of the Congo
| | - Doris Feineis
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Virima Mudogo
- Faculty of Sciences, University of Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002, Basel, Switzerland
- University of Basel, Petersplatz 1, CH-4003, Basel, Switzerland
| | - Reto Brun
- Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002, Basel, Switzerland
- University of Basel, Petersplatz 1, CH-4003, Basel, Switzerland
| | - Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074, Würzburg, Germany.
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Bringmann G, Steinert C, Feineis D, Mudogo V, Betzin J, Scheller C. HIV-inhibitory michellamine-type dimeric naphthylisoquinoline alkaloids from the Central African liana Ancistrocladus congolensis. PHYTOCHEMISTRY 2016; 128:71-81. [PMID: 27137461 DOI: 10.1016/j.phytochem.2016.04.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 04/15/2016] [Accepted: 04/22/2016] [Indexed: 06/05/2023]
Abstract
Five michellamine-type dimeric naphthylisoquinoline alkaloids (NIQs), named michellamines A2, A3, A4, B2, and B3, have been isolated from the root bark of the Central African liana Ancistrocladus congolensisJ. Léonard (Ancistrocladaceae), along with their two known parent compounds, the michellamines A and B, which had so far only been detected in the Cameroonian species Ancistrocladus korupensis. Five monomeric representatives, viz., korupensamine D, ancistrobrevine B, hamatine, 5'-O-demethylhamatine, and 6-O-methylhamatine, already known from related Ancistrocladus species, have likewise been identified. The structure elucidation was achieved by spectroscopic analysis including HRESIMS, 1D and 2D NMR, and by chemical and chiroptical methods. The michellamines A2, A3, B3, and A4 were evaluated for their cytotoxic and anti-HIV activities at a concentration range of 0-100 μM against the HIV reference strain IIIB/LAI in A3.01 T lymphoblast cell cultures, and their effects were compared to the ones displayed by the known michellamines A and B. Inhibitory activities for HIV replication were monitored for the michellamines A2 (IC50 = 29.6 μM), A3 (IC50 = 15.2 μM), A4 (IC50 = 35.9 μM), and B (IC50 = 20.4 μM). The michellamines A and B3, by contrast, did not inhibit HIV replication. No cytotoxicity was observed. Furthermore, the chemotaxonomic significance of the previously undescribed michellamines is discussed.
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Affiliation(s)
- Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
| | - Claudia Steinert
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Doris Feineis
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Virima Mudogo
- Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, The Democratic Republic of the Congo
| | - Julia Betzin
- Institute of Virology and Immunology, University of Würzburg, Versbacher Straße 7, D-97078 Würzburg, Germany
| | - Carsten Scheller
- Institute of Virology and Immunology, University of Würzburg, Versbacher Straße 7, D-97078 Würzburg, Germany
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Hemberger Y, Zhang G, Brun R, Kaiser M, Bringmann G. Highly antiplasmodial non-natural oxidative products of dioncophylline A: synthesis, absolute configuration, and conformational stability. Chemistry 2015; 21:14507-18. [PMID: 26272344 DOI: 10.1002/chem.201501657] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Indexed: 11/11/2022]
Abstract
Four new compounds, the monomeric dioncotetralones A (6 a) and B (6 b) and the dimeric compounds jozimine A3 (7) and jozimine A4 (9), were semi-synthesized from the natural product dioncophylline A (4) and its 5'-O-demethylated derivative (5), respectively, under phenol oxidative reaction conditions. Dioncotetralones A (6 a) and B (6 b) possess an unprecedented Z-configured double bond, in contrast to the classic biaryl axis that is present in the precursor dioncophylline A (4), and an additional stereogenic center at the C2' atom was generated due to the dearomatization. The resulting steric repulsion forced the expected planar double bond into a helical distorted conformation. The homocoupling of 5 yielded compounds 7 and 9, the latter of which is the first sp(3) -sp(2) coupled product of a monomeric naphthylisoquinoline with a reduced one and, thus, contains a newly generated stereogenic center. The full stereostructures of 6 a, 6 b, 7, and 9 were successfully elucidated by the interplay of spectroscopic methods (1D/2D NMR and electronic circular-dichroism spectroscopy) in combination with quantum-chemical calculations. In addition, compounds 6 a and 7 exhibited high antiplasmodial activities with excellent half-maximal inhibitory concentration values.
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Affiliation(s)
- Yasmin Hemberger
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg (Germany)
| | - Guoliang Zhang
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg (Germany)
| | - Reto Brun
- Swiss Tropical and Public Health Institute, Socinstrasse 57, 4002 Basel (Switzerland) and University of Basel, Petersplatz 1, 4003 Basel (Switzerland)
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute, Socinstrasse 57, 4002 Basel (Switzerland) and University of Basel, Petersplatz 1, 4003 Basel (Switzerland)
| | - Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg (Germany).
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Seger C, Sturm S, Stuppner H. Mass spectrometry and NMR spectroscopy: modern high-end detectors for high resolution separation techniques--state of the art in natural product HPLC-MS, HPLC-NMR, and CE-MS hyphenations. Nat Prod Rep 2013; 30:970-87. [PMID: 23739842 DOI: 10.1039/c3np70015a] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Current natural product research is unthinkable without the use of high resolution separation techniques as high performance liquid chromatography or capillary electrophoresis (HPLC or CE respectively) combined with mass spectrometers (MS) or nuclear magnetic resonance (NMR) spectrometers. These hyphenated instrumental analysis platforms (CE-MS, HPLC-MS or HPLC-NMR) are valuable tools for natural product de novo identification, as well as the authentication, distribution, and quantification of constituents in biogenic raw materials, natural medicines and biological materials obtained from model organisms, animals and humans. Moreover, metabolic profiling and metabolic fingerprinting applications can be addressed as well as pharmacodynamic and pharmacokinetic issues. This review provides an overview of latest technological developments, discusses the assets and drawbacks of the available hyphenation techniques, and describes typical analytical workflows.
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Affiliation(s)
- Christoph Seger
- Institute of Pharmacy/Pharmacognosy, CCB-Centrum of Chemistry and Biomedicine, University of Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria
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Bringmann G, Lombe BK, Steinert C, Ioset KN, Brun R, Turini F, Heubl G, Mudogo V. Mbandakamines A and B, Unsymmetrically Coupled Dimeric Naphthylisoquinoline Alkaloids, from a Congolese Ancistrocladus Species. Org Lett 2013; 15:2590-3. [DOI: 10.1021/ol4005883] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gerhard Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo, Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland, and Department of Biology I, Biodiversity Research, Section Systematic Botany, Ludwig-Maximilians University Munich, Menzinger Strasse 67, D-80638 München,
| | - Blaise Kimbadi Lombe
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo, Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland, and Department of Biology I, Biodiversity Research, Section Systematic Botany, Ludwig-Maximilians University Munich, Menzinger Strasse 67, D-80638 München,
| | - Claudia Steinert
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo, Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland, and Department of Biology I, Biodiversity Research, Section Systematic Botany, Ludwig-Maximilians University Munich, Menzinger Strasse 67, D-80638 München,
| | - Karine Ndjoko Ioset
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo, Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland, and Department of Biology I, Biodiversity Research, Section Systematic Botany, Ludwig-Maximilians University Munich, Menzinger Strasse 67, D-80638 München,
| | - Reto Brun
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo, Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland, and Department of Biology I, Biodiversity Research, Section Systematic Botany, Ludwig-Maximilians University Munich, Menzinger Strasse 67, D-80638 München,
| | - Florian Turini
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo, Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland, and Department of Biology I, Biodiversity Research, Section Systematic Botany, Ludwig-Maximilians University Munich, Menzinger Strasse 67, D-80638 München,
| | - Günther Heubl
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo, Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland, and Department of Biology I, Biodiversity Research, Section Systematic Botany, Ludwig-Maximilians University Munich, Menzinger Strasse 67, D-80638 München,
| | - Virima Mudogo
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, Faculté des Sciences, Université de Kinshasa, B.P. 202, Kinshasa XI, Democratic Republic of the Congo, Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002 Basel, Switzerland, University of Basel, Petersplatz 1, CH-4003 Basel, Switzerland, and Department of Biology I, Biodiversity Research, Section Systematic Botany, Ludwig-Maximilians University Munich, Menzinger Strasse 67, D-80638 München,
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Sturm S, Seger C. Liquid chromatography-nuclear magnetic resonance coupling as alternative to liquid chromatography-mass spectrometry hyphenations: curious option or powerful and complementary routine tool? J Chromatogr A 2012; 1259:50-61. [PMID: 22658656 DOI: 10.1016/j.chroma.2012.05.032] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Revised: 05/06/2012] [Accepted: 05/08/2012] [Indexed: 01/22/2023]
Abstract
Combining the most powerful separation techniques, i.e. liquid chromatography (LC) or capillary electrophoresis (CE) with a information rich detection system - the mass spectrometer or the nuclear magnetic resonance (NMR) spectrometer - has been pursued for more than three decades. This compilation shall provide an overview of the advantages and limitations of the LC-NMR hyphenation in the light of its most valued application-the unequivocal analyte identification. Especially the post LC trapping of analytes with an in-line solid phase extraction (SPE) device prior to transferring the analyte of interest to the NMR spectrometer (LC-SPE-NMR) proved to be a robust installation allowing a significant cut-down of the amount of analyte needed for the generation of high quality heteronuclear NMR shift correlation data. Different available technical realizations will be discussed and typical application examples from natural product research and from industrial settings will be given.
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Affiliation(s)
- Sonja Sturm
- Institute of Pharmacy/Pharmacognosy, CCB - Center of Chemistry and Biomedicine, Leopold Franzens University Innsbruck, Innsbruck, Austria
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Xu M, Bruhn T, Hertlein B, Brun R, Stich A, Wu J, Bringmann G. Shuangancistrotectorines A-E, Dimeric Naphthylisoquinoline Alkaloids with Three Chiral Biaryl Axes from the Chinese PlantAncistrocladus tectorius. Chemistry 2010; 16:4206-16. [DOI: 10.1002/chem.200903247] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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New Approaches to Identification and Direct Isolation of Novel Bioactive Compounds from Natural Products. Chin J Nat Med 2009. [DOI: 10.3724/sp.j.1009.2008.00006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pimentel-Elardo SM, Gulder TA, Hentschel U, Bringmann G. Cebulactams A1 and A2, new macrolactams isolated from Saccharopolyspora cebuensis, the first obligate marine strain of the genus Saccharopolyspora. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.09.094] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Iwasa K, Takahashi T, Nishiyama Y, Moriyasu M, Sugiura M, Takeuchi A, Tode C, Tokuda H, Takeda K. Online structural elucidation of alkaloids and other constituents in crude extracts and cultured cells of Nandina domestica by combination of LC-MS/MS, LC-NMR, and LC-CD analyses. JOURNAL OF NATURAL PRODUCTS 2008; 71:1376-1385. [PMID: 18671433 DOI: 10.1021/np8001496] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The combination of NMR, MS, and CD data permitted the structural elucidation including the absolute configuration of the known alkaloids and unknown components in the extract matrix solution of Nandina domestica without isolation and sample purification prior to the coupling experiments. Unstable natural stereoisomers were identified by LC-NMR and LC-MS. Five known alkaloids, (S)-isoboldine, (S)-domesticine, (S)-nantenine, sinoacutine, and menispermine, were identified from N. domestica. O-Methylpallidine and (E, E)-, (E, Z)-, and (Z, Z)-terrestribisamide were also characterized for the first time from this plant. Known jatrorrhizine, palmatine, and berberine and unknown (R)-carnegine and (E, E)-, (E, Z)-, and (Z, Z)-terrestribisamide were identified in the callus of N. domestica.
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Affiliation(s)
- Kinuko Iwasa
- Kobe Pharmaceutical University, 4-19-1 Motoyamakita, Higashinada-ku, Kobe-shi 658-8558, Japan.
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20
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Sprogøe K, Staek D, Ziegler HL, Jensen TH, Holm-Møller SB, Jaroszewski JW. Combining HPLC-PDA-MS-SPE-NMR with circular dichroism for complete natural product characterization in crude extracts: levorotatory gossypol in Thespesia danis. JOURNAL OF NATURAL PRODUCTS 2008; 71:516-519. [PMID: 18290629 DOI: 10.1021/np800010r] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Despite recent demonstration of the power of HPLC-PDA-MS-SPE-NMR (high-performance liquid chromatography-photodiode-array detection-mass spectrometry-solid-phase extraction-nuclear magnetic resonance) in structure determination of natural products directly from minute amounts of crude extracts, this technique leaves chirality of the compounds uncharacterized. In this work we demonstrate that postcolumn SPE is a useful method of analyte concentration and accumulation not only for NMR but also for CD (circular dichroism) spectroscopy. Thus, use of HPLC-PDA-MS-SPE-NMR in combination with CD allowed rapid detection of ( R)-(-)-gossypol [( R)- 1] in Thespesia danis, providing a very rare example of the predominance of the levorotatory enantiomer of gossypol. Enantioselectivity of the in vitro antiplasmodial activity of gossypol was also demonstrated; the IC50 value of ( R)- 1 was 4.5 +/- 0.2 microM, with the eudismic ratio of about 2.5. No gossypol was detected in Gossypioides kirkii.
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Affiliation(s)
- Kennett Sprogøe
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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Bringmann G, Gulder TA, Reichert M, Gulder T. The online assignment of the absolute configuration of natural products: HPLC-CD in combination with quantum chemical CD calculations. Chirality 2008; 20:628-42. [DOI: 10.1002/chir.20557] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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22
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Pham LH, Vater J, Rotard W, Mügge C. Identification of secondary metabolites from Streptomyces violaceoruber TU22 by means of on-flow LC-NMR and LC-DAD-MS. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:710-23. [PMID: 16049955 DOI: 10.1002/mrc.1633] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
For rapid screening of natural products from Actinomycetes, a combination of on-line couplings LC-NMR, LC-DAD-MS and HPLC-PDA, as well as MALDI-TOF-MS is particularly suitable. Simultaneous use of these coupling techniques provides considerable advantages for the rapid identification of natural compounds in mixtures. The results of our present investigation on secondary metabolite products of Streptomyces violaceoruber TU 22 showed that more than 50% of the identified metabolites are new compounds. The structures of four new polyketides (granaticin C, metenaticin A, B and C) as well as four known ones (granaticin A, granatomycin E, daidzein and genistein) have been elucidated using LC-NMR, LC-MS/MS and -MS(n) techniques in combination with two-dimensional NMR spectroscopy.
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Affiliation(s)
- L H Pham
- Inst. f. Chemie, AG Biochemie u. Molekulare Biologie, Technische Universität Berlin, Germany
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Exarchou V, Krucker M, van Beek TA, Vervoort J, Gerothanassis IP, Albert K. LC-NMR coupling technology: recent advancements and applications in natural products analysis. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:681-7. [PMID: 16049952 DOI: 10.1002/mrc.1632] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
An overview of recent advances in nuclear magnetic resonance (NMR) coupled with separation technologies and their application in natural product analysis is given and discussed. The different modes of LC-NMR operation are described, as well as how technical improvements assist in establishing LC-NMR as an important tool in the analysis of plant-derived compounds. On-flow, stopped-flow and loop-storage procedures are mentioned, together with the new LC-SPE-NMR configuration. The implementation of mass spectrometry in LC-NMR is also useful on account of the molecular weight and fragmentation information that it provides, especially when new plant species are studied. Cryogenic technology and capillary LC-NMR are the other important recent developments. Since the plant kingdom is endless in producing potential drug candidates, development and optimization of LC-NMR techniques convert the study of natural products to a less-time-consuming task, speeding up identification.
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Seger C, Godejohann M, Tseng LH, Spraul M, Girtler A, Sturm S, Stuppner H. LC-DAD-MS/SPE-NMR Hyphenation. A Tool for the Analysis of Pharmaceutically Used Plant Extracts: Identification of Isobaric Iridoid Glycoside Regioisomers from Harpagophytum procumbens. Anal Chem 2004; 77:878-85. [PMID: 15679357 DOI: 10.1021/ac048772r] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
LC-DAD-MS monitored fractionation of a Harpagophytum procumbens DC. (Pedaliaceae) root extract was combined with a hyphenated LC-DAD-MS/SPE-NMR technique, thus providing the spectral data needed for structure elucidation. This approach allowed the characterization of isobaric iridoid glycoside regioisomers present only as minor constituents. The analytes were identified as the (E/Z) pairs of 6'-O-(p-coumaroyl)harpagide (6'-PCHG) and 8-O-(p-coumaroyl)-harpagide (8-PCHG). The fact that 8-(Z)-PCHG constitutes a new natural product underlines the analytical power of this combined approach. Furthermore, derivatives 6'-(Z)- and 6'-(E)-PCHG are new constituents for H. procumbens.
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Affiliation(s)
- Christoph Seger
- Institute of Pharmacy, Department of Pharmacognosy, Leopold Franzens University Innsbruck, Innrain 52, A-6020 Innsbruck, Austria
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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. JOURNAL OF NATURAL PRODUCTS 2004; 67:2058-2062. [PMID: 15620251 DOI: 10.1021/np0497651] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [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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Exarchou V, Godejohann M, van Beek TA, Gerothanassis IP, Vervoort J. LC-UV-solid-phase extraction-NMR-MS combined with a cryogenic flow probe and its application to the identification of compounds present in Greek oregano. Anal Chem 2004; 75:6288-94. [PMID: 14616013 DOI: 10.1021/ac0347819] [Citation(s) in RCA: 189] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Structure elucidation of natural products usually relies on a combination of NMR spectroscopy with mass spectrometry whereby NMR trails MS in terms of the minimum sample amount required. In the present study, the usefulness of on-line solid-phase extraction (SPE) in LC-NMR for peak storage after the LC separation prior to NMR analysis is demonstrated. The SPE unit allows the use of normal protonated solvents for the LC separation and fully deuterated solvents for flushing the trapped compounds to the NMR probe. Thus, solvent suppression is no longer necessary. Multiple trapping of the same analyte from repeated LC injections was utilized to solve the problem of low concentration and to obtain 2D heteronuclear NMR spectra. In addition, a combination of the SPE unit with a recently developed cryoflow NMR probe and an MS was evaluated. This on-line LC-UV-SPE-NMR-MS system was used for the automated analysis of a Greek oregano extract. Combining the data provided by the UV, MS, and NMR spectra, the flavonoids taxifolin, aromadendrin, eriodictyol, naringenin, and apigenin, the phenolic acid rosmarinic acid, and the monoterpene carvacrol were identified. This automated technique is very useful for natural product analysis, and the large sensitivity improvement leads to significantly reduced NMR acquisition times.
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Affiliation(s)
- Vassiliki Exarchou
- Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands.
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Advantages and disadvantages of nuclear magnetic resonance spectroscopy as a hyphenated technique. Anal Chim Acta 2003. [DOI: 10.1016/j.aca.2003.08.048] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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28
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Karagianis G, Viljoen A, Waterman PG. Identification of major metabolites in Aloe littoralis by high-performance liquid chromatography-nuclear magnetic resonance spectroscopy. PHYTOCHEMICAL ANALYSIS : PCA 2003; 14:275-280. [PMID: 14515998 DOI: 10.1002/pca.714] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Examination of the leaf exudate of the South African species Aloe littoralis by reversed-phase HPLC revealed the presence of two major metabolites. The identification of the two compounds without isolation was attempted by HPLC-NMR based on separation using a C18 column eluting with a deuterium oxide:acetonitrile solvent gradient and an inverse HPLC-NMR probe. For each compound, one-dimensional proton spectra, and two-dimensional homonuclear COSY and TOCSY, and heteronuclear HSQC and HMBC, spectra were collected. On the basis of the data obtained, the metabolites were characterised as 10-hydroxyaloin B and deacetyllittoraloin.
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Affiliation(s)
- Gloria Karagianis
- Centre for Phytochemistry, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia.
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Bringmann G, Gulden KP, Busemann S. Calculation of circular dichroism spectra of michellamines A and C, based on a complete conformational analysis. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00032-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Biomedical applications of directly-coupled chromatography–nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS). ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1567-7192(03)80011-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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31
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Bringmann G, Lang G. Full absolute stereostructures of natural products directly from crude extracts: The HPLC-MS/ MS-NMR-CD 'triad'. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2003; 37:89-116. [PMID: 15825641 DOI: 10.1007/978-3-642-55519-0_4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
This chapter deals with an efficient methodology available in our Center of Excellence, BIOTECmarin: the novel analytical 'triad' HPLC-MS/MS-NMR-CD. By this method, which was, in this complemented form, first introduced into phytochemical research by our group, we can not only rapidly identify known structures, but can also investigate new metabolites and establish their full absolute stereostructures online, directly from crude extracts, without the necessity of first isolating the compounds. The LC-CD option, which we have been using for the first time in natural products analysis, becomes even more valuable by the possibility of interpreting the online CD spectra by their simulation or prediction through quantum chemical calculation, thus avoiding the usual, often risky, empirical comparison with the CD spectra of (sometimes not so related) compounds of known absolute stereostructure or the application of (sometimes not really applicable) likewise empirical CD rules. The hyphenated analytical methods are additionally complemented by our synthetic expertise, again involving new concepts and strategies developed in our group. The methods and their application will first be explained and exemplified for plant-derived ('terrestrial') natural products, for which they were initially developed, and will then be applied to the online structural elucidation of novel natural products from marine organisms.
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Affiliation(s)
- G Bringmann
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
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Bringmann G, Rummey C. 3D QSAR investigations on antimalarial naphthylisoquinoline alkaloids by comparative molecular similarity indices analysis (CoMSIA), based on different alignment approaches. JOURNAL OF CHEMICAL INFORMATION AND COMPUTER SCIENCES 2003; 43:304-16. [PMID: 12546566 DOI: 10.1021/ci025570s] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
3D QSAR models based on the CoMSIA descriptor fields were established using a diverse data set of 53 antimalarial biaryl compounds (tested in vitro against a chloroquine-resistant strain of Plasmodium falciparum), consisting mainly of naphthylisoquinoline alkaloids, but also including phenylanthraquinone structures and naphthylindenes. For the alignment, two commercially available automated approaches, FLEXS and GASP, were compared; initially none of them succeeded in treating the important phenomenon of axial chirality correctly, but after some manual refinement of the alignments initially obtained, the best overall model, based on a modified FLEXS alignment, showed a q(2) (cross-validated r(2)) of 0.818 (eight components), using only the hydrophobic and the H-bond donor and acceptor fields. Using a test set of five compounds the model showed a squared multiple correlation coefficient for the test set (predictive r(2)) of 0.578. The analysis of the 3D contour maps permitted interesting conclusions about the effects of particular functional groups on the biological activity and will now guide the design of novel, hopefully even more active compounds.
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Affiliation(s)
- Gerhard Bringmann
- Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Setzer WN, Vogler B, Bates RB, Schmidt JM, Dicus CW, Nakkiew P, Haber WA. HPLC-NMR/HPLC-MS analysis of the bark extract of Stauranthus perforatus. PHYTOCHEMICAL ANALYSIS : PCA 2003; 14:54-59. [PMID: 12597256 DOI: 10.1002/pca.687] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A combination of HPLC-MS and HPLC-NMR techniques has been used to analyse the cytotoxic fractions of the dichloromethane extract of bark of Stauranthus perforatus. Six furanocoumarins (byakangelicol, heraclenin, heraclenol, imperatorin, isopimpinellin and xanthotoxin) and nine quinoline alkaloids (two known compounds, veprisine and 5-hydroxy-1-methyl-2-phenyl-4-quinolone, along with seven novel compounds, stauranthine, 3',4'-dihydroxy-3',4'-dihydroveprisine, 3',4'-dihydroxy-3',4'-dihydrostauranthine, 3',6'-dihydroxy-3',6'-dihydroveprisine, 3',6'-dihydroxy-3',6'-dihydrostauranthine, 6'-hydroxy-3'-ketoveprisine and 6'-hydroxy-3'-ketostauranthine) have been identified in the fractions.
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Affiliation(s)
- William N Setzer
- Department of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USA.
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Bringmann G, Günther C, Ochse M, Schupp O, Tasler S. Biaryls in nature: a multi-facetted class of stereochemically, biosynthetically, and pharmacologically intriguing secondary metabolites. FORTSCHRITTE DER CHEMIE ORGANISCHER NATURSTOFFE = PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS. PROGRES DANS LA CHIMIE DES SUBSTANCES ORGANIQUES NATURELLES 2002; 82:1-249. [PMID: 11892255 DOI: 10.1007/978-3-7091-6227-9_1] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Affiliation(s)
- G Bringmann
- Institut für Organische Chemie, Universität Würzburg, Germany.
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Bibliography. Current literature in mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2001; 36:1164-1171. [PMID: 11747111 DOI: 10.1002/jms.97] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Current awareness in phytochemical analysis. PHYTOCHEMICAL ANALYSIS : PCA 2001; 12:347-354. [PMID: 11708298 DOI: 10.1002/pca.557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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