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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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2
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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: 1] [Impact Index Per Article: 1.0] [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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3
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Urgoitia G, Herrero MT, Churruca F, Conde N, SanMartin R. Direct Arylation in the Presence of Palladium Pincer Complexes. Molecules 2021; 26:4385. [PMID: 34299661 PMCID: PMC8305722 DOI: 10.3390/molecules26144385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 07/14/2021] [Accepted: 07/16/2021] [Indexed: 12/02/2022] Open
Abstract
Direct arylation is an atom-economical alternative to more established procedures such as Stille, Suzuki or Negishi arylation reactions. In comparison with other palladium sources and ligands, the use of palladium pincer complexes as catalysts or pre-catalysts for direct arylation has resulted in improved efficiency, higher reaction yields, and advantageous reaction conditions. In addition to a revision of the literature concerning intra- and intermolecular direct arylation reactions performed in the presence of palladium pincer complexes, the role of these remarkably active catalysts will also be discussed.
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Affiliation(s)
| | | | | | | | - Raul SanMartin
- Department of Organic and Inorganic Chemistry, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain; (G.U.); (M.T.H.); (F.C.); (N.C.)
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Li Q, Deng AJ, Ji M, Li ZH, Chen XG, Qin HL. Racemic 3,4-dihydro-4-naphthyl-naphthalen-1(2H)-ones from Juglans regia flowers. Fitoterapia 2019; 139:104401. [PMID: 31669964 DOI: 10.1016/j.fitote.2019.104401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 10/21/2019] [Accepted: 10/21/2019] [Indexed: 10/25/2022]
Abstract
Three previously undescribed (±)-3,4-dihydro-4-naphthyl-naphthalen-1(2H)-one derivatives were isolated from Juglans regia flowers. Elucidation of the 2D structures of these first-reported compounds was completed via regular spectroscopic methods. The assignment of racemic nature of these compounds was achieved using the examination of their chiral HPLC profiles. (±)-2,3-Dihydro-4',8,8'-trihydroxy-(1,1'-binaphthalen)-4(1H)-one, (±)-2,3-dihydro-4',5,8,8'-tetrahydroxy-(1,1'-binaphthalen)-4(1H)-one, and (±)-2,3-dihydro-1',5,5',8-tetrahydroxy-(1,2'-binaphthalen)-4(1H)-one were the structures of these racemic compounds, all taking on central chirality. The resolution of all the racemic compounds was conducted and achieved using a chiral HPLC procedure. The absolute configurations of the three isolated pairs of enantiomers were assigned via time-dependent density functional theory calculations from the electronic circular dichroism data. The findings in this paper demonstrated that the relevant biochemical reactions for the construction of these 3,4-dihydro-4-naphthyl-naphthalen-1(2H)-one derivatives in the test plant are nonselective. The (±)-2,3-dihydro-4',8,8'-trihydroxy-(1,1'-binaphthalen)-4(1H)-one showed selective inhibitory activity on tumor cells growth, preliminarily supporting the application of Juglans regia flowers to protect against cancers in a few Chinese folk areas.
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Affiliation(s)
- Qian Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China; College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, China
| | - An-Jun Deng
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
| | - Ming Ji
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Zhi-Hong Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Xiao-Guang Chen
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Hai-Lin Qin
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.
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Tshitenge DT, Bruhn T, Feineis D, Mudogo V, Kaiser M, Brun R, Bringmann G. An Unusually Broad Series of Seven Cyclombandakamines, Bridged Dimeric Naphthylisoquinoline Alkaloids from the Congolese Liana Ancistrocladus ealaensis. Sci Rep 2019; 9:9812. [PMID: 31285489 PMCID: PMC6614417 DOI: 10.1038/s41598-019-46336-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 06/26/2019] [Indexed: 11/17/2022] Open
Abstract
A series of seven unusual dimeric naphthylisoquinoline alkaloids was isolated from the leaves of the tropical liana Ancistrocladus ealaensis J. Léonard, named cyclombandakamine A (1), 1-epi-cyclombandakamine A (2), and cyclombandakamines A3–7 (3–7). These alkaloids have a chemically thrilling structural array consisting of a twisted dihydrofuran-cyclohexenone-isochromene system. The 1′″-epimer of 4, cyclombandakamine A1 (8), had previously been discovered in an unidentified Ancistrocladus species related to A. ealaensis. Both lianas produce the potential parent precursor, mbandakamine A (9), but only A. ealaensis synthesizes the corresponding cyclized form, along with a broad series of slightly modified analogs. The challenging isolation required, besides multi-dimensional chromatography, the use of a pentafluorophenyl stationary phase. Featuring up to six stereocenters and two types of chiral axes, their structures were elucidated by means of 1D and 2D NMR, HRESIMS, in combination with oxidative chemical degradation experiments as well as chiroptical (electronic circular dichroism spectroscopy) and quantum chemical calculations. Compared to the ‘open-chain’ parent compound 9, these dimers displayed rather moderate antiplasmodial activities.
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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
| | - Torsten Bruhn
- 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
| | - 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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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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Zhou C, Fang F, Cheng Y, Li Y, Liu H, Zhou Y. Rhodium(III)-Catalyzed C-H Activation of Benzoylacetonitriles and Cyclization with Sulfoxonium Ylides to Naphthols. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800362] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Chaofan Zhou
- Nano Science and Technology Institute; University of Science and Technology of China; 166 Ren Ai Road Suzhou 215123 People's Republic of China
- Key Laboratory of Receptor Research, S; hanghai Institute of Materia Medica; Chinese Academy of Sciences; 555 Zu Chong Zhi Road Shanghai 201203 People's Republic of China
| | - Feifei Fang
- Key Laboratory of Receptor Research, S; hanghai Institute of Materia Medica; Chinese Academy of Sciences; 555 Zu Chong Zhi Road Shanghai 201203 People's Republic of China
| | - Yilang Cheng
- Key Laboratory of Receptor Research, S; hanghai Institute of Materia Medica; Chinese Academy of Sciences; 555 Zu Chong Zhi Road Shanghai 201203 People's Republic of China
| | - Yazhou Li
- Key Laboratory of Receptor Research, S; hanghai Institute of Materia Medica; Chinese Academy of Sciences; 555 Zu Chong Zhi Road Shanghai 201203 People's Republic of China
| | - Hong Liu
- Key Laboratory of Receptor Research, S; hanghai Institute of Materia Medica; Chinese Academy of Sciences; 555 Zu Chong Zhi Road Shanghai 201203 People's Republic of China
| | - Yu Zhou
- Key Laboratory of Receptor Research, S; hanghai Institute of Materia Medica; Chinese Academy of Sciences; 555 Zu Chong Zhi Road Shanghai 201203 People's Republic of China
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Seupel R, Hemberger Y, Feineis D, Xu M, Seo EJ, Efferth T, Bringmann G. Ancistrocyclinones A and B, unprecedented pentacyclic N,C-coupled naphthylisoquinoline alkaloids, from the Chinese liana Ancistrocladus tectorius. Org Biomol Chem 2018; 16:1581-1590. [DOI: 10.1039/c7ob03092d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The pentacyclic berberine-like ancistrocyclinones A and B represent a new subtype of naphthylisoquinoline alkaloids, with an intriguing helical 3D structure.
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Affiliation(s)
- Raina Seupel
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Yasmin Hemberger
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Doris Feineis
- Institute of Organic Chemistry
- University of Würzburg
- D-97074 Würzburg
- Germany
| | - Minjuan Xu
- Key Laboratory of Systems Biomedicine
- Shanghai Center for Systems Biomedicine
- Shanghai Jia Tong University
- Shanghai 200240
- P.R. China
| | - Ean-Jeong Seo
- Institute of Pharmacy and Biochemistry
- Department of Pharmaceutical Biology
- University of Mainz
- D-55128 Mainz
- Germany
| | - Thomas Efferth
- Institute of Pharmacy and Biochemistry
- Department of Pharmaceutical Biology
- University of Mainz
- D-55128 Mainz
- 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: 23] [Impact Index Per Article: 3.3] [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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11
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Lombe BK, Bruhn T, Feineis D, Mudogo V, Brun R, Bringmann G. Cyclombandakamines A1 and A2, Oxygen-Bridged Naphthylisoquinoline Dimers from a Congolese Ancistrocladus Liana. Org Lett 2017; 19:1342-1345. [DOI: 10.1021/acs.orglett.7b00209] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- 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
| | - 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
| | - Virima Mudogo
- Faculté
des Sciences, Université de Kinshasa, B.P. 202 Kinshasa XI, Democratic Republic of the Congo
| | - 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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12
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Górecki M, Roszkowski P, Błachut D, Maurin JK, Budzianowski A, Frelek J, Czarnocki Z. Atropoisomerism in Mono- and Diaryl-Substituted 4-Amino-2,6-lutidines. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600456] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Marcin Górecki
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Piotr Roszkowski
- Faculty of Chemistry; University of Warsaw; Pasteura 1 02-093 Warsaw Poland
| | - Dariusz Błachut
- Forensic Laboratory; Internal Security Agency; 1 Sierpnia 30A 02-134 Warsaw Poland
| | - Jan K. Maurin
- National Medicines Institute; Chełmska 30/34 00-725 Warsaw Poland
- National Centre for Nuclear Research; Andrzeja Sołtana 7 05-400 Otwock-Świerk Poland
| | - Armand Budzianowski
- National Centre for Nuclear Research; Andrzeja Sołtana 7 05-400 Otwock-Świerk Poland
| | - Jadwiga Frelek
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Zbigniew Czarnocki
- Faculty of Chemistry; University of Warsaw; Pasteura 1 02-093 Warsaw Poland
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