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Dai M, Yuan X, Kang J, Zhu ZJ, Yue RC, Yuan H, Chen BY, Zhang WD, Liu RH, Sun QY. Synthesis and biological evaluation of phenyl substituted polyoxygenated xanthone derivatives as anti-hepatoma agents. Eur J Med Chem 2013; 69:159-66. [DOI: 10.1016/j.ejmech.2013.08.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2013] [Revised: 08/08/2013] [Accepted: 08/12/2013] [Indexed: 12/01/2022]
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52
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Ramani T, Umadevi P, Prasanth KL, Sreedhar B. Synthesis ofortho-Hydroxybenzophenones Catalyzed by Magnetically Retrievable Fe3O4Nanoparticles under Ligand-Free Conditions. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300909] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Sun RR, Miao FP, Zhang J, Wang G, Yin XL, Ji NY. Three new xanthone derivatives from an algicolous isolate of Aspergillus wentii. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2013; 51:65-68. [PMID: 23172582 DOI: 10.1002/mrc.3903] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 10/25/2012] [Accepted: 11/06/2012] [Indexed: 06/01/2023]
Abstract
Three new xanthone derivatives, yicathin A (1), yicathin B (2), and yicathin C (3), and three known anthraquinone derivatives, alatinone (4), 1,5-dihydroxy-3-methoxy-7-methylanthraquinone (5), and 5-hydroxy-1,3-dimethoxy-7-methylanthraquinone (6), were isolated from the cultures of Aspergillus wentii pt-1, an endophytic fungus isolated from the marine red alga Gymnogongrus flabelliformis. Their structures were unambiguously elucidated by NMR and mass spectroscopic methods as well as quantum chemical calculations. Compound 2 was active against Escherichia coli, and 3 could inhibit E. coli, Staphylococcus aureus, and Colletotrichum lagenarium.
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Schätzle MA, Husain SM, Ferlaino S, Müller M. Tautomers of Anthrahydroquinones: Enzymatic Reduction and Implications for Chrysophanol, Monodictyphenone, and Related Xanthone Biosyntheses. J Am Chem Soc 2012; 134:14742-5. [DOI: 10.1021/ja307151x] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Michael A. Schätzle
- Institut
für Pharmazeutische Wissenschaften, Albert-Ludwigs-Universität Freiburg, Albertstr.
25, 79104 Freiburg, Germany
| | - Syed Masood Husain
- Institut
für Pharmazeutische Wissenschaften, Albert-Ludwigs-Universität Freiburg, Albertstr.
25, 79104 Freiburg, Germany
| | - Sascha Ferlaino
- Institut
für Pharmazeutische Wissenschaften, Albert-Ludwigs-Universität Freiburg, Albertstr.
25, 79104 Freiburg, Germany
| | - Michael Müller
- Institut
für Pharmazeutische Wissenschaften, Albert-Ludwigs-Universität Freiburg, Albertstr.
25, 79104 Freiburg, Germany
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Meister AC, Nieger M, Bräse S. Synthesis of 4-Hydroxy-5-methyl- and 4-Hydroxy-6-methylcyclohexenones by PdII-Catalyzed Oxidation and Lipase-Catalyzed Hydrolysis. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200704] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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56
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Masters KS, Bräse S. Xanthones from fungi, lichens, and bacteria: the natural products and their synthesis. Chem Rev 2012; 112:3717-76. [PMID: 22617028 DOI: 10.1021/cr100446h] [Citation(s) in RCA: 291] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Kye-Simeon Masters
- Institute for Organic Chemistry, Karlsruhe Institute of Technology, Germany.
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Zhang F, Li L, Niu S, Si Y, Guo L, Jiang X, Che Y. A thiopyranchromenone and other chromone derivatives from an Endolichenic fungus, Preussia africana. JOURNAL OF NATURAL PRODUCTS 2012; 75:230-237. [PMID: 22324636 DOI: 10.1021/np2009362] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The first example of a naturally occurring thiopyranchromenone, preussochromone A (1), and five other new chromone derivatives, preussochromones B-F (2-6), were isolated from solid cultures of an endolichenic fungus, Preussia africana. The structures of 1-6 were established primarily by NMR experiments, and 2 and 4 were further confirmed by X-ray crystallography. The absolute configurations of 1 and 2 were determined by the application of electronic circular dichroism (ECD), whereas those of C-5 in 3, C-6 in 4, and the 6,7-diol in 5 were deduced via the CD data of the in situ formed [Rh₂(OCOCF₃)₄] complex, the modified Mosher method, and Snatzke's method, respectively. Compounds 1 and 3 showed significant cytotoxicity against A549 cells.
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Affiliation(s)
- Fan Zhang
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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58
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Mayer AMS, Rodríguez AD, Berlinck RGS, Fusetani N. Marine pharmacology in 2007-8: Marine compounds with antibacterial, anticoagulant, antifungal, anti-inflammatory, antimalarial, antiprotozoal, antituberculosis, and antiviral activities; affecting the immune and nervous system, and other miscellaneous mechanisms of action. Comp Biochem Physiol C Toxicol Pharmacol 2011; 153:191-222. [PMID: 20826228 PMCID: PMC7110230 DOI: 10.1016/j.cbpc.2010.08.008] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Revised: 08/25/2010] [Accepted: 08/25/2010] [Indexed: 11/23/2022]
Abstract
The peer-reviewed marine pharmacology literature in 2007-8 is covered in this review, which follows a similar format to the previous 1998-2006 reviews of this series. The preclinical pharmacology of structurally characterized marine compounds isolated from marine animals, algae, fungi and bacteria is discussed in a comprehensive manner. Antibacterial, anticoagulant, antifungal, antimalarial, antiprotozoal, antituberculosis and antiviral activities were reported for 74 marine natural products. Additionally, 59 marine compounds were reported to affect the cardiovascular, immune and nervous systems as well as to possess anti-inflammatory effects. Finally, 65 marine metabolites were shown to bind to a variety of receptors and miscellaneous molecular targets, and thus upon further completion of mechanism of action studies, will contribute to several pharmacological classes. Marine pharmacology research during 2007-8 remained a global enterprise, with researchers from 26 countries, and the United States, contributing to the preclinical pharmacology of 197 marine compounds which are part of the preclinical marine pharmaceuticals pipeline. Sustained preclinical research with marine natural products demonstrating novel pharmacological activities, will probably result in the expansion of the current marine pharmaceutical clinical pipeline, which currently consists of 13 marine natural products, analogs or derivatives targeting a limited number of disease categories.
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Affiliation(s)
- Alejandro M S Mayer
- Department of Pharmacology, Chicago College of Osteopathic Medicine, Midwestern University, 555 31st Street, Downers Grove, IL 60515, USA.
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59
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60
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Yang H, Mahapatra S, Cheong PHY, Carter RG. Highly stereoselective and scalable anti-aldol reactions using N-(p-dodecylphenylsulfonyl)-2-pyrrolidinecarboxamide: scope and origins of stereoselectivities. J Org Chem 2010; 75:7279-90. [PMID: 20932013 PMCID: PMC2966945 DOI: 10.1021/jo1015008] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly enantio- and diastereoselective anti-aldol process (up to >99% ee, >99:1 dr) catalyzed by a proline mimetic-N-(p-dodecylphenylsulfonyl)-2-pyrrolidinecarboxamide-has been developed. Catalyst loading as low as 2 mol % can be employed. Use of industry-friendly solvents for this transformation as well as neat reaction conditions have been demonstrated. The scope of this transformation on a range of aldehydes and ketones is explored. Density functional theory computations reveal that the origins of enhanced diastereoselectivity are due to the presence of nonclassical hydrogen bonds between the sulfonamide, the electrophile, and the catalyst enamine that favor the major anti-Re aldol TS in the Houk-List model.
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Affiliation(s)
- Hua Yang
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331
| | | | | | - Rich G. Carter
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331
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Lölsberg W, Ye S, Schmalz H. Enantioselective Copper‐Catalysed Allylic Alkylation of Cinnamyl Chlorides by Grignard Reagents using Chiral Phosphine‐Phosphite Ligands. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000213] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Wibke Lölsberg
- Department für Chemie, Universität zu Köln, Greinstraße 4, 50939 Köln, Germany, Fax: (+49)‐221‐470‐3064; phone: (+49)‐221‐470‐3063
| | - Shute Ye
- Department für Chemie, Universität zu Köln, Greinstraße 4, 50939 Köln, Germany, Fax: (+49)‐221‐470‐3064; phone: (+49)‐221‐470‐3063
| | - Hans‐Günther Schmalz
- Department für Chemie, Universität zu Köln, Greinstraße 4, 50939 Köln, Germany, Fax: (+49)‐221‐470‐3064; phone: (+49)‐221‐470‐3063
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63
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Su QG, Liu Y, Cai YC, Sun YL, Wang B, Xian LJ. Anti-tumour effects of xanthone derivatives and the possible mechanisms of action. Invest New Drugs 2010; 29:1230-40. [DOI: 10.1007/s10637-010-9468-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2010] [Accepted: 05/26/2010] [Indexed: 11/27/2022]
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Pescitelli G, Kurtán T, Flörke U, Krohn K. Absolute structural elucidation of natural products--a focus on quantum-mechanical calculations of solid-state CD spectra. Chirality 2010; 21 Suppl 1:E181-201. [PMID: 19902530 DOI: 10.1002/chir.20795] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In this review article we examine state-of-the-art techniques for the structural elucidation of organic compounds isolated from natural sources. In particular, we focus on the determination of absolute configuration (AC), perhaps the most challenging but inevitable step in the whole process, especially when newly isolated compounds are screened for biological activity. Among the many methods employed for AC assignment that we review, special attention is paid to electronic circular dichroism (CD) and to the modern tools available for quantum-mechanics CD predictions, including TDDFT. In this context, we stress that conformational flexibility often poses a limit to practical CD calculations of solution CD spectra. Many crystalline natural products suitable for X-ray analysis do not contain heavy atoms for a confidential AC assignment by resonant scattering. However, their CD spectra can be recorded in the solid state, for example with the KCl pellet technique, and analyzed possibly by nonempirical means to provide stereochemical information. In particular, solid-state CD spectra can be compared with those calculated with TDDFT or other high-level methods, using the X-ray geometry as input. The solid-state CD/TDDFT approach, described in detail, represents a quick and reliable tool for AC assignment of natural products.
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, University of Pisa, Pisa, Italy.
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65
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Wang Y, Zheng Z, Liu S, Zhang H, Li E, Guo L, Che Y. Oxepinochromenones, furochromenone, and their putative precursors from the endolichenic fungus Coniochaeta sp. JOURNAL OF NATURAL PRODUCTS 2010; 73:920-4. [PMID: 20405881 DOI: 10.1021/np100071z] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Six new polyketides including four oxepinochromenones, conioxepinols A-D (1-4), one furochromenone, coniofurol A (5), and one xanthone, conioxanthone A (6), have been isolated from the crude extract of the endolichenic fungus Coniochaeta sp. The absolute configurations of C-7 in 1 and the 7,8-diol moiety in 3 were assigned using the modified Mosher's and Snatzke's method, respectively, whereas that of C-8 in 5 was deduced via the circular dichroism data of the [Rh(2)(OCOCF(3))(4)] complex. Compounds 2-4 showed modest cytotoxicity against a small panel of human tumor cell lines.
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Affiliation(s)
- Yinchao Wang
- Key Laboratory of Systematic Mycology & Lichenology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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66
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Lin J, Liu S, Sun B, Niu S, Li E, Liu X, Che Y. Polyketides from the ascomycete fungus Leptosphaeria sp. JOURNAL OF NATURAL PRODUCTS 2010; 73:905-910. [PMID: 20408555 DOI: 10.1021/np1000335] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The new polyketides leptosphaerins A-G (1-7) and the known compounds monodictysin B (8), 2-(2,6-dihydroxybenzoyl)-3-hydroxy-5-methylbenzoic acid (9), and 2-(2,6-dihydroxy-4-methylbenzoyl)-6-hydroxybenzoic acid (10) have been isolated from solid cultures of the ascomycete fungus Leptosphaeria sp. The absolute configurations of compounds 1, 2, and 6 were assigned using the modified Mosher method, whereas that of C-2 in 3 was determined via the circular dichroism data of the [Rh(2)(OCOCF(3))(4)] complex. Compound 7 showed antifungal activity against Aspergillus flavus.
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Affiliation(s)
- Jie Lin
- Key Laboratory of Systematic Mycology & Lichenology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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67
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68
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Direct C–H bond arylation of 2-hydroxybenzaldehydes with arylboronic acids via ligand-free palladium catalysis. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.02.166] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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69
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Abstract
Abstract
Objectives
Xanthones are simple three-membered ring compounds that are mainly found as secondary metabolites in higher plants and microorganisms. Xanthones have very diverse biological profiles, including antihypertensive, antioxidative, antithrombotic and anticancer activity, depending on their diverse structures, which are modified by substituents on the ring system. Although several reviews have already been published on xanthone compounds, few of them have focused on the anticancer activity of xanthone derivatives. In this review we briefly summarize natural and synthetic xanthone compounds which have potential as anticancer drugs.
Key findings
The interesting structural scaffold and pharmacological importance of xanthone derivatives have led many scientists to isolate or synthesize these compounds as novel drug candidates. In the past, extensive research has been conducted to obtain xanthone derivatives from natural resources as well as through synthetic chemistry. Xanthones interact with various pharmacological targets based on the different substituents on the core ring. The anticancer activities of xanthones are also dramatically altered by the ring substituents and their positions.
Summary
The biological activities of synthetic xanthone derivatives depend on the various substituents and their position. Study of the biological mechanism of action of xanthone analogues, however, has not been conducted extensively compared to the diversity of xanthone compounds. Elucidation of the exact biological target of xanthone compounds will provide better opportunities for these compounds to be developed as potent anticancer drugs. At the same time, modification of natural xanthone derivatives aimed at specific targets is capable of expanding the biological spectrum of xanthone compounds.
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Affiliation(s)
- Younghwa Na
- College of Pharmacy, Catholic University of Daegu, Gyeongsan, Gyeongbuk, Korea
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70
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Bok JW, Chiang YM, Szewczyk E, Reyes-Dominguez Y, Davidson AD, Sanchez JF, Lo HC, Watanabe K, Strauss J, Oakley BR, Wang CCC, Keller NP. Chromatin-level regulation of biosynthetic gene clusters. Nat Chem Biol 2009; 5:462-4. [PMID: 19448638 DOI: 10.1038/nchembio.177] [Citation(s) in RCA: 289] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2008] [Accepted: 03/12/2009] [Indexed: 01/15/2023]
Abstract
Loss-of-function Aspergillus nidulans CclA, a Bre2 ortholog involved in histone H3 lysine 4 methylation, activated the expression of cryptic secondary metabolite clusters in A. nidulans. One new cluster generated monodictyphenone, emodin and emodin derivatives, whereas a second encoded two anti-osteoporosis polyketides, F9775A and F9775B. Modification of the chromatin landscape in fungal secondary metabolite clusters allows for a simple technological means to express silent fungal secondary metabolite gene clusters.
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Affiliation(s)
- Jin Woo Bok
- Department of Medical Microbiology and Immunology (formerly Department of Plant Pathology), University of Wisconsin-Madison, Madison, Wisconsin, USA
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Krohn K, Kouam S, Kuigoua G, Hussain H, Cludius-Brandt S, Flörke U, Kurtán T, Pescitelli G, Di Bari L, Draeger S, Schulz B. Xanthones and Oxepino[2, 3-b]chromones from Three Endophytic Fungi. Chemistry 2009; 15:12121-32. [DOI: 10.1002/chem.200900749] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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72
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Pettit GR, Knight JC, Herald DL, Pettit RK, Hogan F, Mukku VJRV, Hamblin JS, Dodson MJ, Chapuis JC. Antineoplastic agents. 570. Isolation and structure elucidation of bacillistatins 1 and 2 from a marine Bacillus silvestris. JOURNAL OF NATURAL PRODUCTS 2009; 72:366-371. [PMID: 19226154 PMCID: PMC2765486 DOI: 10.1021/np800603u] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Two new cyclodepsipeptides designated bacillistatins 1 (1) and 2 (2) have been isolated from cultures of a sample of Bacillus silvestris that was obtained from a Pacific Ocean (southern Chile) crab. Each 12-unit cyclodepsipeptide strongly inhibited growth of a human cancer cell line panel, with GI(50)'s of 10(-4)-10(-5) microg/mL, and each compound was active against antibiotic-resistant Streptococcus pneumoniae. The structures were elucidated by a combination of X-ray diffraction and mass and 2D NMR spectroscopic analyses, together with chemical degradation.
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Affiliation(s)
- George R Pettit
- Cancer Research Institute and Department of Chemistry and Biochemistry, Arizona State University, P.O. Box 871604, Tempe, Arizona 85287-1604, USA.
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73
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Pontius A, Krick A, Kehraus S, Foegen SE, Müller M, Klimo K, Gerhäuser C, König GM. Noduliprevenone: a novel heterodimeric chromanone with cancer chemopreventive potential. Chemistry 2009; 14:9860-3. [PMID: 18830975 DOI: 10.1002/chem.200801574] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alexander Pontius
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, 53115 Bonn, Germany
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74
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Blunt JW, Copp BR, Hu WP, Munro MHG, Northcote PT, Prinsep MR. Marine natural products. Nat Prod Rep 2009; 26:170-244. [PMID: 19177222 DOI: 10.1039/b805113p] [Citation(s) in RCA: 408] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This review covers the literature published in 2007 for marine natural products, with 948 citations(627 for the period January to December 2007) referring to compounds isolated from marine microorganisms and phytoplankton, green algae, brown algae, red algae, sponges, cnidarians,bryozoans, molluscs, tunicates, echinoderms and true mangrove plants. The emphasis is on new compounds (961 for 2007), together with the relevant biological activities, source organisms and country of origin. Biosynthetic studies, first syntheses, and syntheses that lead to the revision of structures or stereochemistries, have been included.1 Introduction, 2 Reviews, 3 Marine microorganisms and phytoplankton, 4 Green algae, 5 Brown algae, 6 Red algae, 7 Sponges, 8 Cnidarians, 9 Bryozoans, 10 Molluscs, 11 Tunicates (ascidians),12 Echinoderms, 13 Miscellaneous, 14 Conclusion, 15 References.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
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75
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Pontius A, Krick A, Mesry R, Kehraus S, Foegen SE, Müller M, Klimo K, Gerhäuser C, König GM. Monodictyochromes A and B, dimeric xanthone derivatives from the marine algicolous fungus Monodictys putredinis. JOURNAL OF NATURAL PRODUCTS 2008; 71:1793-1799. [PMID: 18939864 DOI: 10.1021/np800392w] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Investigations of the marine-derived fungus Monodictys putredinis led to the isolation of two novel dimeric chromanones (1, 2) that consist of two uniquely modified xanthone-derived units. The structures were elucidated by extensive spectroscopic measurements including NOE experiments and CD analysis to deduce the configuration. The compounds (1, 2) were examined for their cancer chemopreventive potential and shown to inhibit cytochrome P450 1A activity with IC(50) values of 5.3 and 7.5 μM, respectively. In addition, both compounds displayed moderate activity as inducers of NAD(P)H:quinone reductase (QR) in cultured mouse Hepa 1c1c7 cells, with CD values (concentration required to double the specific activity of QR) of 22.1 and 24.8 μM, respectively. Compound 1 was slightly less potent than compound 2 in inhibiting aromatase activity, with IC(50) values of 24.4 and 16.5 μM.
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Affiliation(s)
- Alexander Pontius
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, 53115 Bonn, Germany
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76
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A tropical marine microbial natural products geobibliography as an example of desktop exploration of current research using web visualisation tools. Mar Drugs 2008; 6:550-77. [PMID: 19172194 PMCID: PMC2630847 DOI: 10.3390/md20080028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2008] [Revised: 10/09/2008] [Accepted: 10/09/2008] [Indexed: 11/17/2022] Open
Abstract
Microbial marine biodiscovery is a recent scientific endeavour developing at a time when information and other technologies are also undergoing great technical strides. Global visualisation of datasets is now becoming available to the world through powerful and readily available software such as Worldwind, ArcGIS Explorer and Google Earth. Overlaying custom information upon these tools is within the hands of every scientist and more and more scientific organisations are making data available that can also be integrated into these global visualisation tools. The integrated global view that these tools enable provides a powerful desktop exploration tool. Here we demonstrate the value of this approach to marine microbial biodiscovery by developing a geobibliography that incorporates citations on tropical and near-tropical marine microbial natural products research with Google Earth and additional ancillary global data sets. The tools and software used are all readily available and the reader is able to use and install the material described in this article.
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Greve H, Schupp PJ, Eguereva E, Kehraus S, Kelter G, Maier A, Fiebig HH, König GM. Apralactone A and a New Stereochemical Class of Curvularins from the Marine-Derived Fungus Curvularia sp. European J Org Chem 2008; 2008:10.1002/ejoc.200800522. [PMID: 24260014 PMCID: PMC3831275 DOI: 10.1002/ejoc.200800522] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2008] [Indexed: 11/06/2022]
Abstract
Chemical investigations of the cytotoxic extract of the marine-derived fungus Curvularia sp. (strain no. 768), isolated from the red alga Acanthophora spicifera, yielded the novel macrolide apralactone A (1), as well as the antipodes of curvularin macrolides 2-7. Compound 8, a dimeric curvularin was recognised as an artefact. The structures of 1-8 were elucidated by interpretation of their spectroscopic data (1D and 2D NMR, CD, MS, UV and IR). Apralactone A (1) is a 14-membered phenyl acetic acid macrolactone, and the first such compound with a 4-chromanone substructure. Compounds 1, 2, 4, 5 and 6 were found to be cytotoxic towards human tumor cell lines with mean IC50 values in the range of 1.25 to 30.06 µM.
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Affiliation(s)
- Hendrik Greve
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, D-53115 Bonn, Germany
| | - Peter J. Schupp
- Marine Laboratory, University of Guam, Mangilao, Guam, 96923 USA
| | - Ekaterina Eguereva
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, D-53115 Bonn, Germany
| | - Stefan Kehraus
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, D-53115 Bonn, Germany
| | - Gerhard Kelter
- Oncotest GmbH, Institute of Experimental Oncology, Am Flughafen 12-14, D-79108 Freiburg, Germany
| | - Armin Maier
- Oncotest GmbH, Institute of Experimental Oncology, Am Flughafen 12-14, D-79108 Freiburg, Germany
| | - Heinz-Herbert Fiebig
- Oncotest GmbH, Institute of Experimental Oncology, Am Flughafen 12-14, D-79108 Freiburg, Germany
| | - Gabriele M. König
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, D-53115 Bonn, Germany
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M. C. Gérard E, Bräse S. Modular Syntheses of Diversonol-Type Tetrahydroxanthone Mycotoxins: Blennolide C (epi-Hemirugulotrosin A) and Analogues. Chemistry 2008; 14:8086-9. [DOI: 10.1002/chem.200801507] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Pescitelli G, Sreerama N, Salvadori P, Nakanishi K, Berova N, Woody RW. Inherent Chirality Dominates the Visible/Near-Ultraviolet CD Spectrum of Rhodopsin. J Am Chem Soc 2008; 130:6170-81. [DOI: 10.1021/ja711009y] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via Risorgimento 35, I-56126 Pisa, Italy, Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523, and Department of Chemistry, Columbia University, 3000 Broadway, MC 3114, New York 10027
| | - Narasimha Sreerama
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via Risorgimento 35, I-56126 Pisa, Italy, Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523, and Department of Chemistry, Columbia University, 3000 Broadway, MC 3114, New York 10027
| | - Piero Salvadori
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via Risorgimento 35, I-56126 Pisa, Italy, Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523, and Department of Chemistry, Columbia University, 3000 Broadway, MC 3114, New York 10027
| | - Koji Nakanishi
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via Risorgimento 35, I-56126 Pisa, Italy, Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523, and Department of Chemistry, Columbia University, 3000 Broadway, MC 3114, New York 10027
| | - Nina Berova
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via Risorgimento 35, I-56126 Pisa, Italy, Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523, and Department of Chemistry, Columbia University, 3000 Broadway, MC 3114, New York 10027
| | - Robert W. Woody
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Pisa, via Risorgimento 35, I-56126 Pisa, Italy, Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523, and Department of Chemistry, Columbia University, 3000 Broadway, MC 3114, New York 10027
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Application of Zinc(II)–Binol for the Formal Aza-Diels–Alder Reaction ofN-Arylimines with Danishefsky's Diene: CD-Based Absolute Stereochemistry Determination, Origin of Asymmetric Induction and Mechanistic Considerations. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700731] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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81
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El-Beih AA, Kawabata T, Koimaru K, Ohta T, Tsukamoto S. Monodictyquinone A: a New Antimicrobial Anthraquinone from a Sea Urchin-Derived Fungus Monodictys sp. Chem Pharm Bull (Tokyo) 2007; 55:1097-8. [PMID: 17603212 DOI: 10.1248/cpb.55.1097] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A new antimicrobial anthraquinone, 1,8-dihydroxy-2-methoxy-6-methylanthraquinone, monodictyquinone A (1), was isolated from a culture of a marine-derived fungus of the genus Monodictys which was isolated from the sea urchin, Anthocidaris crassispina, along with three known compounds, pachybasin (2), chrysophanol (3), and emodin (4).
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Affiliation(s)
- Ahmed Atef El-Beih
- Graduate School of Natural Science and Technology, Kanazawa University, Japan
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