1
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Kallifidas D, Dhakal D, Chen M, Chen QY, Kokkaliari S, Colon Rosa NA, Ratnayake R, Bruner SD, Paul VJ, Ding Y, Luesch H. Biosynthesis of Dolastatin 10 in Marine Cyanobacteria, a Prototype for Multiple Approved Cancer Drugs. Org Lett 2024; 26:1321-1325. [PMID: 38330916 PMCID: PMC10915760 DOI: 10.1021/acs.orglett.3c04083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
Dolastatin 10, a potent tubulin-targeting marine anticancer natural product, provided the basis for the development of six FDA-approved antibody-drug conjugates. Through the screening of cyanobacterial Caldora penicillata environmental DNA libraries and metagenome sequencing, we identified its biosynthetic gene cluster. Functional prediction of 10 enzymes encoded in the 39 kb cluster supports the dolastatin 10 biosynthesis. The nonheme diiron monooxygenase DolJ was biochemically characterized to mediate the terminal thiazole formation in dolastatin 10.
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Affiliation(s)
- Dimitris Kallifidas
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL 32610, United States
| | - Dipesh Dhakal
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL 32610, United States
| | - Manyun Chen
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL 32610, United States
| | - Qi-Yin Chen
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL 32610, United States
| | - Sofia Kokkaliari
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL 32610, United States
| | - Nicole A. Colon Rosa
- Department of Chemistry, University of Florida, Gainesville, FL 32611, United States
| | - Ranjala Ratnayake
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL 32610, United States
| | - Steven D. Bruner
- Department of Chemistry, University of Florida, Gainesville, FL 32611, United States
| | - Valerie J. Paul
- Smithsonian Marine Station, Fort Pierce, FL 34949, United States
| | - Yousong Ding
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL 32610, United States
| | - Hendrik Luesch
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL 32610, United States
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2
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Elsadek LA, Ellis EK, Seabra G, Paul VJ, Luesch H. Chlorinated Enyne Fatty Acid Amides from a Marine Cyanobacterium: Discovery of Taveuniamides L-M and Pharmacological Characterization of Taveuniamide F as a GPCR Antagonist with CNR1 Selectivity. Mar Drugs 2023; 22:28. [PMID: 38248654 PMCID: PMC10817531 DOI: 10.3390/md22010028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 12/07/2023] [Accepted: 12/19/2023] [Indexed: 01/23/2024] Open
Abstract
NMR and MS/MS-based metabolomics of a cyanobacterial extract from Piti Bomb Holes, Guam, indicated the presence of unique enyne-containing halogenated fatty acid amides. We isolated three new compounds of this class, taveuniamides L-N (1-3), along with the previously reported taveuniamide F (4), which was the most abundant analog. The planar structures of the new compounds were established using 1D and 2D NMR as well as mass spectrometry. We established the configuration of this chemical class to be R at C-8 via Mosher's analysis of 4 after reduction of the carboxamide group. Our biological investigations with 4 revealed that the compound binds to the cannabinoid receptor CNR1, acting as an antagonist/inverse agonist in the canonical G-protein signaling pathways. In selectivity profiling against 168 GPCR targets using the β-arrestin functional assay, we found that 4 antagonizes GPR119, NPSR1b, CCR9, CHRM4, GPR120, HTR2A, and GPR103, in addition to CNR1. Interestingly, 4 showed a 6.8-fold selectivity for CNR1 over CNR2. The binding mode of 4 to CNR1 was investigated using docking and molecular dynamics simulations with both natural and unnatural stereoisomers, revealing important CNR1 residues for the interaction and also providing a possible reasoning for the observed CNR1/CNR2 selectivity.
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Affiliation(s)
- Lobna A. Elsadek
- Department of Medicinal Chemistry, University of Florida, 1345 Center Drive, Gainesville, FL 32610, USA; (L.A.E.); (E.K.E.); (G.S.)
- Center for Natural Products, Drug Discovery and Development (CNPD3), 1345 Center Drive, University of Florida, Gainesville, FL 32610, USA
| | - Emma K. Ellis
- Department of Medicinal Chemistry, University of Florida, 1345 Center Drive, Gainesville, FL 32610, USA; (L.A.E.); (E.K.E.); (G.S.)
- Center for Natural Products, Drug Discovery and Development (CNPD3), 1345 Center Drive, University of Florida, Gainesville, FL 32610, USA
| | - Gustavo Seabra
- Department of Medicinal Chemistry, University of Florida, 1345 Center Drive, Gainesville, FL 32610, USA; (L.A.E.); (E.K.E.); (G.S.)
- Center for Natural Products, Drug Discovery and Development (CNPD3), 1345 Center Drive, University of Florida, Gainesville, FL 32610, USA
| | - Valerie J. Paul
- Smithsonian Marine Station, 701 Seaway Drive, Fort Pierce, FL 34949, USA;
| | - Hendrik Luesch
- Department of Medicinal Chemistry, University of Florida, 1345 Center Drive, Gainesville, FL 32610, USA; (L.A.E.); (E.K.E.); (G.S.)
- Center for Natural Products, Drug Discovery and Development (CNPD3), 1345 Center Drive, University of Florida, Gainesville, FL 32610, USA
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3
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Molyneux S, Goss RJM. Fully Aqueous and Air-Compatible Cross-Coupling of Primary Alkyl Halides with Aryl Boronic Species: A Possible and Facile Method. ACS Catal 2023; 13:6365-6374. [PMID: 37180963 PMCID: PMC10167655 DOI: 10.1021/acscatal.3c00252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 04/04/2023] [Indexed: 05/16/2023]
Abstract
Aqueous transformations confer many advantages, including decreased environmental impact and increased opportunity for biomolecule modulation. Although several studies have been conducted to enable the cross-coupling of aryl halides in aqueous conditions, until now a process for the cross-coupling of primary alkyl halides in aqueous conditions was missing from the catalytic toolbox and considered impossible. Alkyl halide coupling in water suffers from severe problems. The reasons for this include the strong propensity for β-hydride elimination, the need for highly air- and water-sensitive catalysts and reagents, and the intolerance of many hydrophilic groups to cross-coupling conditions. Here, we report a broadly applicable and readily accessible process for the cross-coupling of water-soluble alkyl halides in water and air by using simple and commercially available bench-stable reagents. The trisulfonated aryl phosphine TXPTS in combination with a water-soluble palladium salt Na2PdCl4 allowed for the Suzuki-Miyaura coupling of water-soluble alkyl halides with aryl boronic acids, boronic esters, and borofluorate salts in mild, fully aqueous conditions. Multiple challenging functionalities, including unprotected amino acids, an unnatural halogenated amino acid within a peptide, and herbicides can be diversified in water. Structurally complex natural products were used as testbeds to showcase the late-stage tagging methodology of marine natural products to enable liquid chromatography-mass spectrometry (LC-MS) detection. This enabling methodology therefore provides a general method for the environmentally friendly and biocompatible derivatization of sp3 alkyl halide bonds.
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Affiliation(s)
- Samuel Molyneux
- School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, U.K.
| | - Rebecca J. M. Goss
- School of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY16 9ST, U.K.
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4
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Zhang Y, Guo H, Wu Q, Bi X, Shi E, Xiao J. Stereoselective synthesis of ( E)-α,β-unsaturated esters: triethylamine-catalyzed allylic rearrangement of enol phosphates. RSC Adv 2023; 13:13511-13515. [PMID: 37181505 PMCID: PMC10173029 DOI: 10.1039/d3ra02430j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 04/27/2023] [Indexed: 05/16/2023] Open
Abstract
α,β-Unsaturated esters are key structural motifs widely distributed in various biologically active molecules, and their Z/E-stereoselective synthesis has always been considered highly attractive in organic synthesis. Herein, we present a >99% (E)-stereoselective one-pot synthetic approach towards β-phosphoroxylated α,β-unsaturated esters via a mild trimethylamine-catalyzed 1,3-hydrogen migration of the corresponding unconjugated intermediates derived from the solvent-free Perkow reaction between low-cost 4-chloroacetoacetates and phosphites. Versatile β,β-disubstituted (E)-α,β-unsaturated esters were thus afforded with full (E)-stereoretentivity by cleavage of the phosphoenol linkage via Negishi cross-coupling. Moreover, a stereoretentive (E)-rich mixture of a α,β-unsaturated ester derived from 2-chloroacetoacetate was obtained and both isomers were easily afforded in one operation.
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Affiliation(s)
- Yulong Zhang
- State Key Laboratory of NBC Protection for Civilian Beijing 102205 P. R. China
| | - Huichuang Guo
- State Key Laboratory of NBC Protection for Civilian Beijing 102205 P. R. China
| | - Qian Wu
- State Key Laboratory of NBC Protection for Civilian Beijing 102205 P. R. China
| | - Xiaojing Bi
- State Key Laboratory of NBC Protection for Civilian Beijing 102205 P. R. China
| | - Enxue Shi
- State Key Laboratory of NBC Protection for Civilian Beijing 102205 P. R. China
| | - Junhua Xiao
- State Key Laboratory of NBC Protection for Civilian Beijing 102205 P. R. China
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5
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Huo L, Li X, Zhao Y, Li L, Chu L. Site- and Stereoselective Synthesis of Alkenyl Chlorides by Dual Functionalization of Internal Alkynes via Photoredox/Nickel Catalysis. J Am Chem Soc 2023; 145:9876-9885. [PMID: 37072001 DOI: 10.1021/jacs.3c02748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2023]
Abstract
Herein, we report a redox-neutral and atom-economical protocol to synthesize valuable alkenyl chlorides from unactivated internal alkynes and abundant organochlorides via photoredox and nickel catalysis. This protocol enables the site- and stereoselective addition of organochlorides to alkynes via chlorine photoelimination-initiated sequential hydrochlorination/remote C-H functionalization. The protocol is compatible with a wide range of medicinally relevant heteroaryl, aryl, acid, and alkyl chlorides for efficiently producing γ-functionalized alkenyl chlorides, exhibiting excellent regioselectivities and stereoselectivities. Late-stage modifications and synthetic manipulations of the products and preliminary mechanistic studies are also presented.
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Affiliation(s)
- Liping Huo
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai 201620, China
| | - Xiaofang Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai 201620, China
| | - Yaheng Zhao
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai 201620, China
| | - Ling Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai 201620, China
| | - Lingling Chu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai 201620, China
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6
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Gribble GW. Naturally Occurring Organohalogen Compounds-A Comprehensive Review. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2023; 121:1-546. [PMID: 37488466 DOI: 10.1007/978-3-031-26629-4_1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
The present volume is the third in a trilogy that documents naturally occurring organohalogen compounds, bringing the total number-from fewer than 25 in 1968-to approximately 8000 compounds to date. Nearly all of these natural products contain chlorine or bromine, with a few containing iodine and, fewer still, fluorine. Produced by ubiquitous marine (algae, sponges, corals, bryozoa, nudibranchs, fungi, bacteria) and terrestrial organisms (plants, fungi, bacteria, insects, higher animals) and universal abiotic processes (volcanos, forest fires, geothermal events), organohalogens pervade the global ecosystem. Newly identified extraterrestrial sources are also documented. In addition to chemical structures, biological activity, biohalogenation, biodegradation, natural function, and future outlook are presented.
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Affiliation(s)
- Gordon W Gribble
- Department of Chemistry, Dartmouth College, Hanover, NH, 03755, USA.
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7
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Azzi E, Ghigo G, Sarasino L, Parisotto S, Moro R, Renzi P, Deagostino A. Photoinduced Chloroamination Cyclization Cascade with N-Chlorosuccinimide: From N-(Allenyl)sulfonylamides to 2-(1-Chlorovinyl)pyrrolidines. J Org Chem 2022; 88:6420-6433. [DOI: 10.1021/acs.joc.2c01963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Emanuele Azzi
- Department of Chemistry, University of Torino, Via P. Giuria 7, 10125, Turin, Italy
| | - Giovanni Ghigo
- Department of Chemistry, University of Torino, Via P. Giuria 7, 10125, Turin, Italy
| | - Lorenzo Sarasino
- Department of Chemistry, University of Torino, Via P. Giuria 7, 10125, Turin, Italy
| | - Stefano Parisotto
- Department of Chemistry, University of Torino, Via P. Giuria 7, 10125, Turin, Italy
| | - Riccardo Moro
- Department of Chemistry, University of Torino, Via P. Giuria 7, 10125, Turin, Italy
| | - Polyssena Renzi
- Department of Chemistry, University of Torino, Via P. Giuria 7, 10125, Turin, Italy
| | - Annamaria Deagostino
- Department of Chemistry, University of Torino, Via P. Giuria 7, 10125, Turin, Italy
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8
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Kim GJ, Mascuch SJ, Mevers E, Boudreau PD, Gerwick WH, Choi H. Luquilloamides, Cytotoxic Lipopeptides from a Puerto Rican Collection of the Filamentous Marine Cyanobacterium Oscillatoria sp. J Org Chem 2021; 87:1043-1055. [PMID: 34967649 DOI: 10.1021/acs.joc.1c02340] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Luquilloamides A-G (1-7) were isolated from a small environmental collection of a marine cyanobacterium found growing on eelgrass (Zostera sp.) near Luquillo, Puerto Rico. Structure elucidation of the luquilloamides was accomplished via detailed NMR and MS analyses, and absolute configurations were determined using a combination of advanced Mosher's method, J-based configuration analysis, semisynthetic fragment analysis derived from ozonolysis, methylation, Baeyer-Villiger oxidation, Mosher's esterification, specific rotations, and ECD data. Except for 2, the luquilloamides share a characteristic tert-butyl-containing polyketide fragment, β-alanine, and a proposed highly modified polyketide extension. While compound 1 is a linear lipopeptide with two α-methyl branches and a vinyl chloride functionality in the polyketide portion, compounds 4, 6, and 7 possess a cyclohexanone structure with methylation on the α- or β-positions of the polyketide as well as an acetyl group. Interestingly, the absolute configuration at C-5 and C-6 on the cyclohexanone unit in 7 is opposite to that of 4-6. Compound 3 was revealed to have a tert-butyl-containing polyketide, β-alanine, and a PKS/NRPS-derived γ-isopropyl pyrrolinone. Compound 2 may be a hydrolysis product of 3. Of the seven new compounds, 1 showed the most potent cytotoxicity to human H-460 lung cancer cells.
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Affiliation(s)
- Geum Jin Kim
- College of Pharmacy and Institute of Cell Culture, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Samantha J Mascuch
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States
| | - Emily Mevers
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States.,Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Paul D Boudreau
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States.,Department of BioMolecular Sciences, School of Pharmacy, The University of Mississippi, University, Mississippi 38677, United States
| | - William H Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States.,Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92093, United States
| | - Hyukjae Choi
- College of Pharmacy and Institute of Cell Culture, Yeungnam University, Gyeongsan 38541, Republic of Korea.,Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States
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9
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Adak T, Hoffmann M, Witzel S, Rudolph M, Dreuw A, Hashmi ASK. Visible Light-Enabled sp 3 -C-H Functionalization with Chloro- and Bromoalkynes: Chemoselective Route to Vinylchlorides or Alkynes. Chemistry 2020; 26:15573-15580. [PMID: 32472581 PMCID: PMC7756539 DOI: 10.1002/chem.202001259] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 05/26/2020] [Indexed: 12/21/2022]
Abstract
An unprecedented direct atom-economic chemo- and regioselective hydroalkylation of chloroalkynes and an sp3 -C-H alkynylation of bromoalkynes was achieved. The reaction partners are unfunctionalized ethers, alcohols, amides, and even non-activated hydrocarbons. We found that a household fluorescent bulb was able to excite a diaryl ketone, which then selectively abstracts a H-atom from an sp3 -C-H bond. The product of a formal alkyne insertion into the sp3 -C-H bond was obtained with chloroalkynes, providing valuable vinyl chlorides. The photo-organocatalytic hydrogen atom transfer strategy gives rise to a broad range of diversely functionalized olefins. When bromoalkynes are applied in the presence of a base, a chemoselectivity switch to an alkynylation is observed. This reaction can even be performed for the alkynylation of unactivated sp3 -C-H bonds, in this case with a preference of the more substituted carbon. Accompanying quantum chemical calculations indicate a vinyl radical intermediate with pronounced linear coordination of the carbon radical center, thus enabling the formation of both diastereoisomers after H-atom abstraction, suggesting that the (Z)-diastereoisomer is preferred, which supports the experimentally observed (E/Z)-distribution.
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Affiliation(s)
- Tapas Adak
- Organisch-Chemisches InstitutHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Marvin Hoffmann
- Theoretical and Computational ChemistryInterdisciplinary Center for Scientific Computing (IWR)Heidelberg UniversityIm Neuenheimer Feld 205A69120HeidelbergGermany
| | - Sina Witzel
- Organisch-Chemisches InstitutHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Matthias Rudolph
- Organisch-Chemisches InstitutHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Andreas Dreuw
- Theoretical and Computational ChemistryInterdisciplinary Center for Scientific Computing (IWR)Heidelberg UniversityIm Neuenheimer Feld 205A69120HeidelbergGermany
| | - A. Stephen K. Hashmi
- Organisch-Chemisches InstitutHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
- Chemistry DepartmentFaculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia
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10
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Makarieva TN, Ivanchina NV, Stonik VA. Application of Oxidative and Reductive Transformations in the Structure Determination of Marine Natural Products. JOURNAL OF NATURAL PRODUCTS 2020; 83:1314-1333. [PMID: 32091208 DOI: 10.1021/acs.jnatprod.9b01020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This review highlights the application of oxidative and reductive chemical transformations in the structure determination of complex marine natural products, including their absolute configurations. Workability of the Baeyer-Villiger reaction, ozonolysis, periodate oxidation, hydrogenolysis, and reductive amination, as well as other related chemical transformations, are discussed.
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Affiliation(s)
- Tatyana N Makarieva
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok, Pr. 100 let, Vladivostoku, 159, Russia
| | - Natalia V Ivanchina
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok, Pr. 100 let, Vladivostoku, 159, Russia
| | - Valentin A Stonik
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok, Pr. 100 let, Vladivostoku, 159, Russia
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11
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Wang T, Wu B, Guo W, Wu S, Zhang H, Dang Y, Wang J. Synthesis, catalysis, and DFT study of a ruthenium carbene complex bearing a 1,2-dicarbadodecaborane (12)-1,2-dithiolate ligand. Dalton Trans 2019; 48:2646-2656. [PMID: 30702720 DOI: 10.1039/c8dt04290j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A ruthenium carbene catalyst containing a 1,2-dicarbadodecaborane(12)-1,2-dithiolate ligand was synthesized, and the structure was determined by single crystal X-ray diffraction. This new ruthenium carbene catalyst can catalyze the ring opening metathesis polymerization (ROMP) reaction of norbornene to give the corresponding Z-polymer (Z/E ratio, 98 : 2) in high yield (93%); ring opening cross metathesis (ROCM) reactions of norbornene/5-norbornene-2-exo, 3-exo-dimethanol with styrene or 4-fluorostyrene to give the corresponding Z-olefin products (Z/E ratios, 97 : 3-98 : 2), respectively, in high yields (73%-88%); cross metathesis (CM) reactions of terminal alkenes with (Z)-but-2-ene-1,4-diol to give high Z-olefin products in low yields; homometathesis reactions of terminal alkenes to give olefin products in low yields. Like other ruthenium carbene catalysts, the new complex tolerates many different functional groups. DFT calculations were also performed in order to understand the process of forming Z-olefin products and the decomposition process of catalysts.
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Affiliation(s)
- Tao Wang
- Department of Chemistry, College of Science, Tianjin University, Tianjin 300350, P. R. China.
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12
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Liu C, Xue Y, Ding L, Zhang H, Yang F. Au-Catalyzed Addition of Nucleophiles to Chloroalkynes: A Regio- and Stereoselective Synthesis of (Z
)-Alkenyl Chlorides. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801222] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Congrong Liu
- School of Environment Engineering; Nanjing Institute of Technology; 1 Hongjingdadao 211167 Nanjing Jiangsu China
| | - Yunbo Xue
- School of Environment Engineering; Nanjing Institute of Technology; 1 Hongjingdadao 211167 Nanjing Jiangsu China
| | - Lianghui Ding
- School of Environment Engineering; Nanjing Institute of Technology; 1 Hongjingdadao 211167 Nanjing Jiangsu China
| | - Haiyun Zhang
- School of Environment Engineering; Nanjing Institute of Technology; 1 Hongjingdadao 211167 Nanjing Jiangsu China
| | - Fulai Yang
- Department State Key Laboratory of Natural Medicines; Department of Organic Chemistry; China Pharmaceutical University; 210009 Nanjing P. R. China
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13
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Bertin MJ, Saurí J, Liu Y, Via CW, Roduit AF, Williamson RT. Trichophycins B-F, Chlorovinylidene-Containing Polyketides Isolated from a Cyanobacterial Bloom. J Org Chem 2018; 83:13256-13266. [PMID: 30280904 DOI: 10.1021/acs.joc.8b02070] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
NMR-guided isolation (based on 1D 1H and 13C NMR resonances consistent with a chlorovinylidene moiety) resulted in the characterization of five new highly functionalized polyketides, trichophycins B-F (1-5), and one nonchlorinated metabolite tricholactone (6) from a collection of Trichodesmium bloom material from the Gulf of Mexico. The planar structures of 1-6 were determined using 1D and 2D NMR spectroscopy, mass spectrometry, and complementary spectroscopic procedures. Absolute configuration analysis of 1 and 2 were carried out by 1H NMR analysis of diastereomeric Mosher esters in addition to ECD spectroscopy, J-based configuration analysis, and DFT calculations. The absolute configurations of 3-6 were proposed on the basis of comparative analysis of 13C NMR chemical shifts, relative configurations, and optical rotation values to compounds 1 and 2. Compounds 1-5 represent new additions to the trichophycin family and are hallmarked by a chlorovinylidene moiety. These new trichophycins and tricholactone (1-6) feature intriguing variations with respect to putative biosynthetic starting units, halogenation, and terminations, and trichophycin E (4) features a rare alkynyl bromide functionality. The phenyl-containing trichophycins showed low cytotoxicity to neuro-2A cells, while the alkyne-containing trichophycins showed no toxicity.
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Affiliation(s)
- Matthew J Bertin
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy , University of Rhode Island , 7 Greenhouse Road , Kingston , Rhode Island 02881 , United States
| | - Josep Saurí
- Structure Elucidation Group, Process and Analytical Research and Development , Merck and Co. Inc , 33 Avenue Louis Pasteur , Boston , Massachusetts 02115 , United States
| | - Yizhou Liu
- Structure Elucidation Group, Process and Analytical Research and Development , Merck and Co. Inc , 126 East Lincoln Avenue , Rahway , New Jersey 07065 , United States
| | - Christopher W Via
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy , University of Rhode Island , 7 Greenhouse Road , Kingston , Rhode Island 02881 , United States
| | - Alexandre F Roduit
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy , University of Rhode Island , 7 Greenhouse Road , Kingston , Rhode Island 02881 , United States
| | - R Thomas Williamson
- Structure Elucidation Group, Process and Analytical Research and Development , Merck and Co. Inc , 126 East Lincoln Avenue , Rahway , New Jersey 07065 , United States
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14
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Chen B, Xia X, Zeng X, Xu B. Hydrogen bonding network assisted regio- and stereo- controlled hydrohalogenations of sulfonyl alkynes. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.09.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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15
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Crnkovic CM, Krunic A, May DS, Wilson TA, Kao D, Burdette JE, Fuchs JR, Oberlies NH, Orjala J. Calothrixamides A and B from the Cultured Cyanobacterium Calothrix sp. UIC 10520. JOURNAL OF NATURAL PRODUCTS 2018; 81:2083-2090. [PMID: 30192537 PMCID: PMC6359934 DOI: 10.1021/acs.jnatprod.8b00432] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Cyanobacteria are a source of chemically diverse metabolites with potential medicinal and biotechnological applications. Rapid identification of compounds is central to expedite the natural product discovery process. Mass spectrometry has been shown to be an important tool for dereplication of complex natural product samples. In addition, chromatographic separation and complementary spectroscopic analysis (e.g., UV) can enhance the confidence of the dereplication process. Here, we applied a droplet-liquid microjunction-surface sampling probe (droplet probe) coupled with UPLC-PDA-HRMS-MS/MS to identify two new natural products in situ from the freshwater strain Calothrix sp. UIC 10520. This allowed us to prioritize this strain for chemical investigation based on the presence of new metabolites very early in our discovery process, saving both time and resources. Subsequently, calothrixamides A (1) and B (2) were isolated from large-scale cultures, and the structures were elucidated by 1D and 2D NMR spectroscopy and mass spectrometry. The absolute configurations were determined by a combination of chemical degradation reactions, derivatization methods (Mosher's, Marfey's, and phenylglycine methyl ester), and J-based configurational analysis. Calothrixamides showed no cytotoxic activity against the MDA-MB-435, MDA-MB-231, and OVCAR3 cancer cell lines. They represent the first functionalized long-chain fatty acid amides reported from the Calothrix genus and from a freshwater cyanobacterium.
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Affiliation(s)
- Camila M. Crnkovic
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
- CAPES Foundation, Ministry of Education of Brazil, Brasília, Federal District 70040-020, Brazil
| | - Aleksej Krunic
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Daniel S. May
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Tyler A. Wilson
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Diana Kao
- Department of Chemistry & Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27402, United States
| | - Joanna E. Burdette
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - James R. Fuchs
- Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States
| | - Nicholas H. Oberlies
- Department of Chemistry & Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27402, United States
| | - Jimmy Orjala
- Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
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16
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Via CW, Glukhov E, Costa S, Zimba PV, Moeller PDR, Gerwick WH, Bertin MJ. The Metabolome of a Cyanobacterial Bloom Visualized by MS/MS-Based Molecular Networking Reveals New Neurotoxic Smenamide Analogs (C, D, and E). Front Chem 2018; 6:316. [PMID: 30094232 PMCID: PMC6071517 DOI: 10.3389/fchem.2018.00316] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 07/09/2018] [Indexed: 11/29/2022] Open
Abstract
Members of the cyanobacterial genus Trichodesmium are well known for their substantial impact on nitrogen influx in ocean ecosystems and the enormous surface blooms they form in tropical and subtropical locations. However, the secondary metabolite composition of these complex environmental bloom events is not well known, nor the possibility of the production of potent toxins that have been observed in other bloom-forming marine and freshwater cyanobacteria species. In the present work, we aimed to characterize the metabolome of a Trichodesmium bloom utilizing MS/MS-based molecular networking. Furthermore, we integrated cytotoxicity assays in order to identify and ultimately isolate potential cyanotoxins from the bloom. These efforts led to the isolation and identification of several members of the smenamide family, including three new smenamide analogs (1-3) as well as the previously reported smenothiazole A-hybrid polyketide-peptide compounds. Two of these new smenamides possessed cytotoxicity to neuro-2A cells (1 and 3) and their presence elicits further questions as to their potential ecological roles. HPLC profiling and molecular networking of chromatography fractions from the bloom revealed an elaborate secondary metabolome, generating hypotheses with respect to the environmental role of these metabolites and the consistency of this chemical composition across genera, space and time.
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Affiliation(s)
- Christopher W. Via
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI, United States
| | - Evgenia Glukhov
- Center for Marine Biotechnology and Biomedicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA, United States
| | - Samuel Costa
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI, United States
| | - Paul V. Zimba
- Center for Coastal Studies and Department of Life Sciences, Texas A&M Corpus Christi, Corpus Christi, TX, United States
| | - Peter D. R. Moeller
- Emerging Toxins Program, Hollings Marine Laboratory, National Ocean Service/NOAA, Charleston, SC, United States
| | - William H. Gerwick
- Center for Marine Biotechnology and Biomedicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA, United States
| | - Matthew J. Bertin
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, Kingston, RI, United States
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17
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Synthesis of E- and Z-trisubstituted alkenes by catalytic cross-metathesis. Nature 2018; 552:347-354. [PMID: 29293209 PMCID: PMC5967255 DOI: 10.1038/nature25002] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 10/25/2017] [Indexed: 11/08/2022]
Abstract
Catalytic cross-metathesis is a central transformation in chemistry, yet corresponding methods for the stereoselective generation of acyclic trisubstituted alkenes in either the E or the Z isomeric forms are not known. The key problems are a lack of chemoselectivity-namely, the preponderance of side reactions involving only the less hindered starting alkene, resulting in homo-metathesis by-products-and the formation of short-lived methylidene complexes. By contrast, in catalytic cross-coupling, substrates are more distinct and homocoupling is less of a problem. Here we show that through cross-metathesis reactions involving E- or Z-trisubstituted alkenes, which are easily prepared from commercially available starting materials by cross-coupling reactions, many desirable and otherwise difficult-to-access linear E- or Z-trisubstituted alkenes can be synthesized efficiently and in exceptional stereoisomeric purity (up to 98 per cent E or 95 per cent Z). The utility of the strategy is demonstrated by the concise stereoselective syntheses of biologically active compounds, such as the antifungal indiacen B and the anti-inflammatory coibacin D.
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18
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Zeng X, Liu S, Hammond GB, Xu B. Hydrogen-Bonding-Assisted Brønsted Acid and Gold Catalysis: Access to Both ( E)- and ( Z)-1,2-Haloalkenes via Hydrochlorination of Haloalkynes. ACS Catal 2018; 8:904-909. [PMID: 30410816 PMCID: PMC6207084 DOI: 10.1021/acscatal.7b03563] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 12/10/2017] [Indexed: 12/23/2022]
Abstract
![]()
We
have developed an efficient synthesis of both (Z)-
and (E)-chlorohaloalkenes via hydrochlorination
of haloalkynes, based on two distinct hydrogen-bond-network-assisted
catalytic systems: Brønsted acid catalysis and gold catalysis.
Both systems offer high stereoselectivity, good chemical yields, and
diverse functional group tolerance.
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Affiliation(s)
- Xiaojun Zeng
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China
| | - Shiwen Liu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China
| | - Gerald B. Hammond
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Bo Xu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China
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19
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Belisle RS, Via CW, Schock TB, Villareal TA, Zimba PV, Beauchesne KR, Moeller PDR, Bertin MJ. Trichothiazole A, a dichlorinated polyketide containing an embedded thiazole isolated from Trichodesmium blooms. Tetrahedron Lett 2017; 58:4066-4068. [PMID: 32189813 PMCID: PMC7079771 DOI: 10.1016/j.tetlet.2017.09.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mass spectrometry-guided isolation of the lipophilic extract of Trichodesmium bloom material led to the isolation and structure characterization of a new thiazole-containing di-chlorinated polyketide (1). The structure of 1 was deduced using 1D and 2D NMR analysis, high-resolution mass spectrometry analysis and complementary spectroscopic procedures. Trichothiazole A possesses interesting structural features, such as a terminal alkyne, two vinyl chlorides and a 2,4-disubstituted thiazole. Trichothiazole A showed moderate cytotoxicity to Neuro-2A cells (EC50: 13.3 ± 1.1 μM).
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Affiliation(s)
- Richard S. Belisle
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, RI 02881, United States
| | - Christopher W. Via
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, RI 02881, United States
| | - Tracey B. Schock
- National Institutes of Standards and Technology, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, United States
| | - Tracy A. Villareal
- Marine Science Institute, University of Texas at Austin, 750 Channel View Drive, Port Aransas, Texas 78373, United States
| | - Paul V. Zimba
- Center for Coastal Studies and Department of Life Sciences, Texas A&M, Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX 78412, United States
| | - Kevin R. Beauchesne
- Emerging Toxins Program, National Ocean Service/NOAA, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, United States
| | - Peter D. R. Moeller
- Emerging Toxins Program, National Ocean Service/NOAA, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, United States
| | - Matthew J. Bertin
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, RI 02881, United States
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20
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Naman CB, Almaliti J, Armstrong L, Caro-Díaz EJ, Pierce ML, Glukhov E, Fenner A, Spadafora C, Debonsi HM, Dorrestein PC, Murray TF, Gerwick WH. Discovery and Synthesis of Caracolamide A, an Ion Channel Modulating Dichlorovinylidene Containing Phenethylamide from a Panamanian Marine Cyanobacterium cf. Symploca Species. JOURNAL OF NATURAL PRODUCTS 2017; 80:2328-2334. [PMID: 28783331 DOI: 10.1021/acs.jnatprod.7b00367] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A recent untargeted metabolomics investigation into the chemical profile of 10 organic extracts from cf. Symploca spp. revealed several interesting chemical leads for further natural product drug discovery. Subsequent target-directed isolation efforts with one of these, a Panamanian marine cyanobacterium cf. Symploca sp., yielded a phenethylamide metabolite that terminates in a relatively rare gem-dichlorovinylidene moiety, caracolamide A (1), along with a known isotactic polymethoxy-1-alkene (2). Detailed NMR and HRESIMS analyses were used to determine the structures of these molecules, and compound 1 was confirmed by a three-step synthesis. Pure compound 1 was shown to have in vitro calcium influx and calcium channel oscillation modulatory activity when tested as low as 10 pM using cultured murine cortical neurons, but was not cytotoxic to NCI-H460 human non-small-cell lung cancer cells in vitro (IC50 > 10 μM).
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Affiliation(s)
- C Benjamin Naman
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego , La Jolla, California 92093, United States
| | - Jehad Almaliti
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego , La Jolla, California 92093, United States
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, The University of Jordan , Amman, 11942, Jordan
| | - Lorene Armstrong
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego , La Jolla, California 92093, United States
- Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo , Avenida Do Café, s/n, Campus Universitário, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Eduardo J Caro-Díaz
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego , La Jolla, California 92093, United States
| | - Marsha L Pierce
- Department of Pharmacology, Creighton University School of Medicine , 2500 California Plaza, Omaha, Nebraska 68178, United States
| | - Evgenia Glukhov
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego , La Jolla, California 92093, United States
| | - Amanda Fenner
- Center of Cellular and Molecular Biology of Diseases, City of Knowledge, Instituto de Investigaciones Científicas y Sevicios de Alta Tecnología , Bldg. 219, P.O. Box 7250, Panama 5, Republic of Panama
| | - Carmenza Spadafora
- Center of Cellular and Molecular Biology of Diseases, City of Knowledge, Instituto de Investigaciones Científicas y Sevicios de Alta Tecnología , Bldg. 219, P.O. Box 7250, Panama 5, Republic of Panama
| | - Hosana M Debonsi
- Departamento de Física e Química, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo , Avenida Do Café, s/n, Campus Universitário, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Pieter C Dorrestein
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego , La Jolla, California 92093, United States
| | - Thomas F Murray
- Department of Pharmacology, Creighton University School of Medicine , 2500 California Plaza, Omaha, Nebraska 68178, United States
| | - William H Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego , La Jolla, California 92093, United States
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego , La Jolla, California 92093, United States
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21
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Bertin MJ, Wahome PG, Zimba PV, He H, Moeller PDR. Trichophycin A, a Cytotoxic Linear Polyketide Isolated from a Trichodesmium thiebautii Bloom. Mar Drugs 2017; 15:E10. [PMID: 28067831 PMCID: PMC5295230 DOI: 10.3390/md15010010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 12/28/2016] [Accepted: 12/30/2016] [Indexed: 01/30/2023] Open
Abstract
In an effort to isolate and characterize bioactive secondary metabolites from Trichodesmium thiebautii blooms, collected cyanobacteria biomass was subjected to bioassay-guided extraction and fractionation using the human colon cancer cell line HCT-116, resulting in the isolation and subsequent structure characterization of a linear polyketide trichophycin A (1). The planar structure of 1 was completed using 1D and 2D NMR spectroscopy and high-resolution electrospray ionization mass spectrometry (HRESIMS). Trichophycin A was moderately toxic against the murine neuroblastoma cell line Neuro-2A (EC50: 6.5 μM) and HCT-116 cells (EC50: 11.7 μM). Trichophycin A was significantly more cytotoxic than the previously isolated polyketides trichotoxin A and trichotoxin B. These cytotoxicity observations suggest that toxicity may be related to the polyol character of these polyketide compounds.
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Affiliation(s)
- Matthew J Bertin
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, RI 02881, USA.
| | - Paul G Wahome
- Biosortia Pharmaceuticals, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, USA.
| | - Paul V Zimba
- Department of Life Sciences, Texas A&M Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX 78412, USA.
| | - Haiyin He
- Biosortia Pharmaceuticals, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, USA.
| | - Peter D R Moeller
- Emerging Toxins Program, National Ocean Service/NOAA, Hollings Marine Laboratory, 331 Fort Johnson Road, Charleston, SC 29412, USA.
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22
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Cai W, Matthews JH, Paul VJ, Luesch H. Pitiamides A and B, Multifunctional Fatty Acid Amides from Marine Cyanobacteria. PLANTA MEDICA 2016; 82:897-902. [PMID: 27135625 PMCID: PMC5215000 DOI: 10.1055/s-0042-105157] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Two geometric isomers related to pitiamide A, termed 1E-pitiamide B (1) and 1Z-pitiamide B (2), were isolated from a marine cyanobacterium collected from the shallow reef flat at Piti Bomb Holes, Guam, Mariana Islands. The structures of these analogues were elucidated using 1D and 2D NMR analysis. Pitiamide A, which has been previously described, but has not been investigated in bioassays, was co-isolated. Pitiamides A and B were subjected to a biological evaluation and they both showed antiproliferative effects on HCT116 cells with IC50 values of 1-5 µM. Pitiamide A was investigated individually and caused plasma membrane hyperpolarization and an increase of intracellular calcium in HCT116 cells.
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Affiliation(s)
- Weijing Cai
- Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, USA
- Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, Florida 32610, USA
| | - James H. Matthews
- Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, USA
- Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, Florida 32610, USA
| | | | - Hendrik Luesch
- Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, USA
- Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, Florida 32610, USA
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23
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Nguyen TT, Koh MJ, Shen X, Romiti F, Schrock RR, Hoveyda AH. Kinetically controlled E-selective catalytic olefin metathesis. Science 2016; 352:569-75. [PMID: 27126041 PMCID: PMC5748243 DOI: 10.1126/science.aaf4622] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 03/30/2016] [Indexed: 12/20/2022]
Abstract
A major shortcoming in olefin metathesis, a chemical process that is central to research in several branches of chemistry, is the lack of efficient methods that kinetically favor E isomers in the product distribution. Here we show that kinetically E-selective cross-metathesis reactions may be designed to generate thermodynamically disfavored alkenyl chlorides and fluorides in high yield and with exceptional stereoselectivity. With 1.0 to 5.0 mole % of a molybdenum-based catalyst, which may be delivered in the form of air- and moisture-stable paraffin pellets, reactions typically proceed to completion within 4 hours at ambient temperature. Many isomerically pure E-alkenyl chlorides, applicable to catalytic cross-coupling transformations and found in biologically active entities, thus become easily and directly accessible. Similarly, E-alkenyl fluorides can be synthesized from simpler compounds or more complex molecules.
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Affiliation(s)
- Thach T Nguyen
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
| | - Ming Joo Koh
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
| | - Xiao Shen
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
| | - Filippo Romiti
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
| | - Richard R Schrock
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Amir H Hoveyda
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA.
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24
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Direct synthesis of Z-alkenyl halides through catalytic cross-metathesis. Nature 2016; 531:459-65. [PMID: 27008965 PMCID: PMC4858352 DOI: 10.1038/nature17396] [Citation(s) in RCA: 130] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 02/02/2016] [Indexed: 12/23/2022]
Abstract
Olefin metathesis has had a large impact on modern organic chemistry, but important shortcomings remain: for example, the lack of efficient processes that can be used to generate acyclic alkenyl halides. Halo-substituted ruthenium carbene complexes decompose rapidly or deliver low activity and/or minimal stereoselectivity, and our understanding of the corresponding high-oxidation-state systems is limited. Here we show that previously unknown halo-substituted molybdenum alkylidene species are exceptionally reactive and are able to participate in high-yielding olefin metathesis reactions that afford acyclic 1,2-disubstituted Z-alkenyl halides. Transformations are promoted by small amounts of a catalyst that is generated in situ and used with unpurified, commercially available and easy-to-handle liquid 1,2-dihaloethene reagents, and proceed to high conversion at ambient temperature within four hours. We obtain many alkenyl chlorides, bromides and fluorides in up to 91 per cent yield and complete Z selectivity. This method can be used to synthesize biologically active compounds readily and to perform site- and stereoselective fluorination of complex organic molecules.
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25
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Engene N. Caldora penicillata gen. nov., comb. nov. (cyanobacteria), a pantropical marine species with biomedical relevance. JOURNAL OF PHYCOLOGY 2015; 51:670-81. [PMID: 26327714 PMCID: PMC4551411 DOI: 10.1111/jpy.12309] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Many tropical marine cyanobacteria are prolific producers of bioactive secondary metabolites with ecological relevance and promising pharmaceutical applications. One species of chemically rich, tropical marine cyanobacteria that was previously identified as Symploca hydnoides or Symploca sp. corresponds to the traditional taxonomic definition of Phormidium penicillatum. In this study, we clarified the taxonomy of this biomedically and ecologically important cyanobacterium by comparing recently collected specimens with the original type material and the taxonomic description of P. penicillatum. Molecular phylogenetic analyses of the 16S rRNA gene and the 16S-23S internal transcribed spacer regions showed that P. penicillatum formed an independent clade sister to the genus Symploca, and distantly related to Phormidium and Lyngbya. We propose the new genus Caldora for this clade, with Caldora penicillata comb. nov. as the type species and designate as the epitype the recently collected strain FK13-1. Furthermore, the production of bioactive secondary metabolites among various geographically dispersed collections of C. penicillata showed that this species consistently produced the metabolite dolastatin 10 and/or the related compound symplostatin 1, which appear to be robust autapomorphic characters and chemotaxonomic markers for this taxon.
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Affiliation(s)
- Niclas Engene
- Department of Biological Sciences, Florida International University, Miami, FL 33199, USA
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26
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Boudreau PD, Monroe EA, Mehrotra S, Desfor S, Korobeynikov A, Sherman DH, Murray TF, Gerwick L, Dorrestein PC, Gerwick WH. Expanding the Described Metabolome of the Marine Cyanobacterium Moorea producens JHB through Orthogonal Natural Products Workflows. PLoS One 2015. [PMID: 26222584 PMCID: PMC4519256 DOI: 10.1371/journal.pone.0133297] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Moorea producens JHB, a Jamaican strain of tropical filamentous marine cyanobacteria, has been extensively studied by traditional natural products techniques. These previous bioassay and structure guided isolations led to the discovery of two exciting classes of natural products, hectochlorin (1) and jamaicamides A (2) and B (3). In the current study, mass spectrometry-based 'molecular networking' was used to visualize the metabolome of Moorea producens JHB, and both guided and enhanced the isolation workflow, revealing additional metabolites in these compound classes. Further, we developed additional insight into the metabolic capabilities of this strain by genome sequencing analysis, which subsequently led to the isolation of a compound unrelated to the jamaicamide and hectochlorin families. Another approach involved stimulation of the biosynthesis of a minor jamaicamide metabolite by cultivation in modified media, and provided insights about the underlying biosynthetic machinery as well as preliminary structure-activity information within this structure class. This study demonstrated that these orthogonal approaches are complementary and enrich secondary metabolomic coverage even in an extensively studied bacterial strain.
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Affiliation(s)
- Paul D. Boudreau
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, 92093, United States
| | - Emily A. Monroe
- Department of Biology, William Paterson University, Wayne, New Jersey, 07470, United States of America
| | - Suneet Mehrotra
- Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska, 68178, United States of America
| | - Shane Desfor
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, 92093, United States
- Department of Biology, California State University San Marcos, San Marcos, California, 92078, United States of America
| | - Anton Korobeynikov
- Algorithmic Biology Laboratory, St. Petersburg Academic University, Russian Academy of Sciences, St. Petersburg, 194021, Russia
- Department of Mathematics and Mechanics, St. Petersburg State University, St. Petersburg, 194021, Russia
- Center for Algorithmic Biotechnology, St. Petersburg State University, St. Petersburg, 194021, Russia
| | - David H. Sherman
- Life Sciences Institute and Department of Medical Chemistry, University of Michigan, Ann Arbor, Michigan, 48109, United States of America
| | - Thomas F. Murray
- Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska, 68178, United States of America
| | - Lena Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, 92093, United States
| | - Pieter C. Dorrestein
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California, 92093, United States of America
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, 92093, United States of America
| | - William H. Gerwick
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, 92093, United States
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, 92093, United States of America
- * E-mail:
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Gribble GW. Biological Activity of Recently Discovered Halogenated Marine Natural Products. Mar Drugs 2015; 13:4044-136. [PMID: 26133553 PMCID: PMC4515607 DOI: 10.3390/md13074044] [Citation(s) in RCA: 167] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 06/15/2015] [Accepted: 06/17/2015] [Indexed: 01/08/2023] Open
Abstract
This review presents the biological activity-antibacterial, antifungal, anti-parasitic, antiviral, antitumor, antiinflammatory, antioxidant, and enzymatic activity-of halogenated marine natural products discovered in the past five years. Newly discovered examples that do not report biological activity are not included.
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Affiliation(s)
- Gordon W Gribble
- Department of Chemistry, Dartmouth College, Hanover, NH 03755, USA.
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Wang XL, Yang YY, Chen HJ, Wu Y, Ma DS. Synthesis of a vinylchlorine-containing 1,3-diol from a marine cyanophyte. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.04.090] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Mevers E, Haeckl FPJ, Boudreau PD, Byrum T, Dorrestein PC, Valeriote F, Gerwick WH. Lipopeptides from the tropical marine cyanobacterium Symploca sp. JOURNAL OF NATURAL PRODUCTS 2014; 77:969-975. [PMID: 24588245 PMCID: PMC4002153 DOI: 10.1021/np401051z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Indexed: 06/02/2023]
Abstract
A collection of the tropical marine cyanobacterium Symploca sp., collected near Kimbe Bay, Papua New Guinea, previously yielded several new metabolites including kimbeamides A-C, kimbelactone A, and tasihalide C. Investigations into a more polar cytotoxic fraction yielded three new lipopeptides, tasiamides C-E (1-3). The planar structures were deduced by 2D NMR spectroscopy and tandem mass spectrometry, and their absolute configurations were determined by a combination of Marfey's and chiral-phase GC-MS analysis. These new metabolites are similar to several previously isolated compounds, including tasiamide (4), grassystatins (5, 6), and symplocin A, all of which were isolated from similar filamentous marine cyanobacteria.
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Affiliation(s)
- Emily Mevers
- Center
for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States
- Department
of Chemistry and Biochemistry, University
of California San Diego, La Jolla, California 92093, United States
| | - F. P. Jake Haeckl
- Department
of Chemistry and Biochemistry, University
of California San Diego, La Jolla, California 92093, United States
| | - Paul D. Boudreau
- Center
for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States
| | - Tara Byrum
- Center
for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States
| | - Pieter C. Dorrestein
- Department
of Chemistry and Biochemistry, University
of California San Diego, La Jolla, California 92093, United States
- Skaggs
School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, United States
| | - Frederick
A. Valeriote
- Division
of Hematology and Oncology, Department of Internal Medicine, Henry Ford Hospital, Detroit, Michigan 48202, United States
| | - William H. Gerwick
- Center
for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States
- Skaggs
School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, United States
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Abstract
This review covers the literature published in 2012 for marine natural products, with 1035 citations (673 for the period January to December 2012) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1241 for 2012), 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.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
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Abstract
This review covers the isolation, chemical structure, biological activity, structure activity relationships including synthesis of chemical probes, and pharmacological characterization of neuroactive marine natural products; 302 references are cited.
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Affiliation(s)
- Ryuichi Sakai
- Faculty of Fisheries Sciences, Hokkaido University, Hakodate 041-8611, Japan.
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Cui Z, Chen YJ, Gao WY, Feng CG, Lin GQ. Enantioselective Alkenylation of Aldimines Catalyzed by a Rhodium–Diene Complex. Org Lett 2014; 16:1016-9. [DOI: 10.1021/ol5000154] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhe Cui
- College
of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, P. R. China
- CAS Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
| | - Ya-Jing Chen
- CAS Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
| | - Wen-Yun Gao
- College
of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, P. R. China
| | - Chen-Guo Feng
- CAS Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
| | - Guo-Qiang Lin
- CAS Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
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Phylogenetic inferences reveal a large extent of novel biodiversity in chemically rich tropical marine cyanobacteria. Appl Environ Microbiol 2013; 79:1882-8. [PMID: 23315747 DOI: 10.1128/aem.03793-12] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Benthic marine cyanobacteria are known for their prolific biosynthetic capacities to produce structurally diverse secondary metabolites with biomedical application and their ability to form cyanobacterial harmful algal blooms. In an effort to provide taxonomic clarity to better guide future natural product drug discovery investigations and harmful algal bloom monitoring, this study investigated the taxonomy of tropical and subtropical natural product-producing marine cyanobacteria on the basis of their evolutionary relatedness. Our phylogenetic inferences of marine cyanobacterial strains responsible for over 100 bioactive secondary metabolites revealed an uneven taxonomic distribution, with a few groups being responsible for the vast majority of these molecules. Our data also suggest a high degree of novel biodiversity among natural product-producing strains that was previously overlooked by traditional morphology-based taxonomic approaches. This unrecognized biodiversity is primarily due to a lack of proper classification systems since the taxonomy of tropical and subtropical, benthic marine cyanobacteria has only recently been analyzed by phylogenetic methods. This evolutionary study provides a framework for a more robust classification system to better understand the taxonomy of tropical and subtropical marine cyanobacteria and the distribution of natural products in marine cyanobacteria.
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