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Kadikova GN, D’yakonov VA. Synthesis of New Fluorene-Containing 9-Azabicyclo[4.2.1]nona-2,4,7-trienes by [6π+2π]-Cycloaddition of Alkynes to 9H-Fluoren-9-ylmethyl 1H-Azepine-1-carboxylate. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2022. [DOI: 10.1134/s1070428022120284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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2
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Kadikova G, D’yakonov VA, Dzhemilev UM. Cobalt(I)-Catalyzed [6π + 2π] Cycloaddition of 1,2-Dienes and 1,3-Diynes to N-Carbocholesteroxyazepine in the Synthesis of Previously Undescribed Heterofunctional 9-Azabicyclo[4.2.1]nonadi(tri)enes. ACS OMEGA 2021; 6:21755-21763. [PMID: 34471777 PMCID: PMC8388074 DOI: 10.1021/acsomega.1c03321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 08/03/2021] [Indexed: 06/13/2023]
Abstract
Promising heterofunctional (E)-9-azabicyclo[4.2.1]nona-2,4-dienes (79-92%) and 9-azabicyclo[4.2.1]nona-2,4,7-trienes (77-90%) containing a cholesterol fragment in the structure have been synthesized for the first time through the [6π + 2π] cycloaddition reaction of terminal 1,2-dienes and symmetric 1,3-diynes with N-carbocholesteroxyazepine under the action of the Co(acac)2(dppe)/Zn/ZnI2 three-component catalytic system.
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3
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Kadikova GN, D’yakonov VA, Dzhemilev UM. Synthesis of New Functionally Substituted 9-Azabicyclo[4.2.1]nona-2,4,7-trienes by Cobalt(I)-Catalyzed [6π + 2π]-Cycloaddition of N-Carbocholesteroxyazepine to Alkynes. Molecules 2021; 26:2932. [PMID: 34069183 PMCID: PMC8156619 DOI: 10.3390/molecules26102932] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 05/04/2021] [Accepted: 05/11/2021] [Indexed: 02/05/2023] Open
Abstract
Catalytic [6π + 2π]-cycloaddition of N-carbocholesteroxyazepine with functionally substituted terminal alkynes and 1,4-butynediol was performed for the first time under the action of the Co(acac)2(dppe)/Zn/ZnI2 three-component catalytic system. The reaction gave previously undescribed but promising 9-azabicyclo[4.2.1]nona-2,4,7-trienes (in 79-95% yields), covalently bound to a natural metabolite, cholesterol. The structure of the synthesized azabicycles was confirmed by analysis of one- and two-dimensional (1H, 13C, DEPT 13C, COSY, NOESY, HSQC, HMBC) NMR spectra.
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Affiliation(s)
| | - Vladimir A. D’yakonov
- Laboratory of Catalytic Synthesis, Institute of Petrochemistry and Catalysis, Russian Academy of Sciences, 450075 Ufa, Russia; (G.N.K.); (U.M.D.)
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Lacharity JJ, Mailyan AK, Chen KY, Zakarian A. Concise Synthesis of (+)-[ 13 C 4 ]-Anatoxin-a by Dynamic Kinetic Resolution of a Cyclic Iminium Ion. Angew Chem Int Ed Engl 2020; 59:11364-11368. [PMID: 32304178 PMCID: PMC7409530 DOI: 10.1002/anie.202004464] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/17/2020] [Indexed: 11/11/2022]
Abstract
An asymmetric total synthesis of [13 C4 ]-anatoxin-a ([13 C4 ]-1) has been developed from commercially available ethyl [13 C4 ]-acetoacetate ([13 C4 ]-15). The unique requirements associated with isotope incorporation inspired a new, robust, and highly scalable route, providing access to 0.110 g of this internal standard for use in the detection and precise quantification of anatoxin-a in freshwater. A highlight of the synthesis is a method that leverages a cyclic iminium ion racemization to achieve dynamic kinetic resolution in an enantioselective Morita-Baylis-Hillman (MBH) cyclization.
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Affiliation(s)
- Jacob J Lacharity
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106-9510, USA
| | - Artur K Mailyan
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106-9510, USA
| | - Karen Y Chen
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106-9510, USA
| | - Armen Zakarian
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106-9510, USA
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5
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Lacharity JJ, Mailyan AK, Chen KY, Zakarian A. Concise Synthesis of (+)‐[
13
C
4
]‐Anatoxin‐a by Dynamic Kinetic Resolution of a Cyclic Iminium Ion. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jacob J. Lacharity
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106-9510 USA
| | - Artur K. Mailyan
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106-9510 USA
| | - Karen Y. Chen
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106-9510 USA
| | - Armen Zakarian
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106-9510 USA
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6
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Synthesis of new alkynyl containing 9-azabicyclo[4.2.1]nonatrienes from diynes and azepines. MENDELEEV COMMUNICATIONS 2020. [DOI: 10.1016/j.mencom.2020.05.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7
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Basson AJ, McLaughlin MG. Synthesis of Functionalized Isoindolinones via Calcium Catalyzed Generation and Trapping of N-Acyliminium Ions. J Org Chem 2020; 85:5615-5628. [PMID: 32208694 DOI: 10.1021/acs.joc.0c00482] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Herein we report our full investigation into the calcium catalyzed generation and trapping of N-acyliminium ions from readily available 3-hydroxyisoindolinones. We have successfully employed a range of traditional nucleophiles including carbon, nitrogen, and sulfur containing reactive partners. The reaction is tolerant to a wide range of functionalities and provides high value scaffolds in good to excellent yields.
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Affiliation(s)
- Ashley J Basson
- Department of Natural Sciences, Manchester Metropolitan University, Chester Street, Manchester, United Kingdom, M15GD
| | - Mark G McLaughlin
- Department of Natural Sciences, Manchester Metropolitan University, Chester Street, Manchester, United Kingdom, M15GD
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8
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Kadikova GN, D’yakonov VA, Nasretdinov RN, Dzhemileva LU, Dzhemilev UM. Cobalt(I)-catalyzed [6π+2π]-cycloaddition of allenes to N-carbethoxy(phenoxy)azepines for the synthesis of 9-azabicyclo[4.2.1]nona-2,4-dienes. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.130996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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D'yakonov VA, Kadikova GN, Nasretdinov RN, Dzhemileva LU, Dzhemilev UM. Targeted Synthesis of 9-Azabicyclo[4.2.1]nona-2,4,7-trienes by Cobalt(I)-Catalyzed [6π+2π]-Cycloaddition of Alkynes to N
-Substituted Azepines and Their Antitumor Activity. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901837] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Vladimir A. D'yakonov
- Institute of Petrochemistry and Catalysis; Russian Academy of Sciences; 141 Prospekt Oktyabrya 450075 Ufa Russian Federation
| | - Gulnara N. Kadikova
- Institute of Petrochemistry and Catalysis; Russian Academy of Sciences; 141 Prospekt Oktyabrya 450075 Ufa Russian Federation
| | - Ramil N. Nasretdinov
- Institute of Petrochemistry and Catalysis; Russian Academy of Sciences; 141 Prospekt Oktyabrya 450075 Ufa Russian Federation
| | - Lilya U. Dzhemileva
- Institute of Petrochemistry and Catalysis; Russian Academy of Sciences; 141 Prospekt Oktyabrya 450075 Ufa Russian Federation
| | - Usein M. Dzhemilev
- Institute of Petrochemistry and Catalysis; Russian Academy of Sciences; 141 Prospekt Oktyabrya 450075 Ufa Russian Federation
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10
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Nájera C, Foubelo F, Sansano JM, Yus M. Stereodivergent routes in organic synthesis: carbohydrates, amino acids, alkaloids and terpenes. Org Biomol Chem 2020; 18:1232-1278. [DOI: 10.1039/c9ob02419k] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The natural occurrence of enantiomers and diastereomers is often encountered.
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Affiliation(s)
- Carmen Nájera
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Alicante
- E-03080 Alicante
- Spain
| | - Francisco Foubelo
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Alicante
- E-03080 Alicante
- Spain
- Departamento de Química Orgánica
| | - José M. Sansano
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Alicante
- E-03080 Alicante
- Spain
- Departamento de Química Orgánica
| | - Miguel Yus
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Universidad de Alicante
- E-03080 Alicante
- Spain
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11
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Fesenko AA, Yankov AN, Shutalev AD. A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen, heteroatom, and carbon nucleophiles. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130527] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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12
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13
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Affiliation(s)
- Peng Wu
- Department
of Chemistry, Technical University of Denmark, Kongens Lyngby DK-2800, Denmark
- Department
of Immunology and Microbiology, University of Copenhagen, Copenhagen DK-2200, Denmark
- Center
for the Science of Therapeutics, Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, United States
- Department
of Medicine, Harvard Medical School, Boston, Massachusetts 02115, United States
- Renal
Division, Brigham and Women’s Hospital, Boston, Massachusetts 02115, United States
| | - Thomas E. Nielsen
- Department
of Chemistry, Technical University of Denmark, Kongens Lyngby DK-2800, Denmark
- Department
of Immunology and Microbiology, University of Copenhagen, Copenhagen DK-2200, Denmark
- Singapore
Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore
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14
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Kono M, Harada S, Hamada Y, Nemoto T. Formal amide insertion strategy for the synthesis of anatoxin-a using rhodium catalysis. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.01.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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15
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Chandra Bharadwaj K. Intramolecular Morita–Baylis–Hillman and Rauhut–Currier reactions. A catalytic and atom economic route for carbocycles and heterocycles. RSC Adv 2015. [DOI: 10.1039/c5ra13611c] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Intramolecular MBH and RC reactions: glorious past and future opportunities.
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16
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Pandit RP, Lee YR. Novel one-pot synthesis of diverse γ,δ-unsaturated β-ketoesters by thermal cascade reactions of diazodicarbonyl compounds and enol ethers: transformation into substituted 3,5-diketoesters. Org Biomol Chem 2014; 12:4407-11. [DOI: 10.1039/c4ob00664j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel and efficient synthesis of diverse γ,δ-unsaturated β-ketoesters was accomplished by thermal cascade reactions of diazodicarbonyl compounds with enol ethers and the synthesized compounds were further transformed into the corresponding 3,5-diketoesters.
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Affiliation(s)
| | - Yong Rok Lee
- School of Chemical Engineering
- Yeungnam University
- Gyeongsan 712-749, Republic of Korea
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17
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Zhao Y, Song Y, Shen X, Liao J. Feasible Synthesis of Antagonist of GPR40 by Constructing 2-Thiouracil Ring viaAcid Mediated Cyclization. HETEROCYCLES 2011; 83:1145-1151. [PMID: 21776181 DOI: 10.3987/com-11-12175] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
GW1100 is an antagonist of GPR40 identified by high throughput screening recently. The synthesis of GW1100 has been developed. The key step involves cyclization of the 2-thiouracil heterocycle under acidic condition at room temperature.
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Affiliation(s)
- Yongfeng Zhao
- Department of Bioengineering, Bourns College of Engineering, University of California-Riverside, Riverside, CA 92507, USA
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18
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Nair SK, Matthews JJ, Cripps SJ, Ma C, Dovalsantos EZ, Grubbs AW, Sach NW, Hoeve WT, Koster H, Flahive EJ, Tanis SP, Renner M, Wiltenburg JV. Novel synthesis of CP-734432, an EP4 agonist, using Sharpless asymmetric dihydroxylation. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.12.092] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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19
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Toyooka N, Zhou D, Nemoto H, Tezuka Y, Kadota S, Andriamaharavo NR, Garraffo HM, Spande TF, Daly JW. Efficient enantio- and diastereodivergent synthesis of poison-frog alkaloids 251O and trans-223B. J Org Chem 2009; 74:6784-91. [PMID: 19637860 DOI: 10.1021/jo901100m] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient and flexible synthesis of poison-frog alkaloids 251O and trans-223B has been achieved by using for both alkaloids an enantiodivergent process starting from the common lactam 1. The relative stereochemistry of 251O and trans-223B was determined to be 7 (R = n-C(7)H(15), R' = n-Pr) and 14 by the present enantioselective synthesis.
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Affiliation(s)
- Naoki Toyooka
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Sugitani 2630, Toyama 930-0194, Japan.
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20
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Stewart I, Carmichael WW, Sadler R, McGregor GB, Reardon K, Eaglesham GK, Wickramasinghe WA, Seawright AA, Shaw GR. Occupational and environmental hazard assessments for the isolation, purification and toxicity testing of cyanobacterial toxins. Environ Health 2009; 8:52. [PMID: 19925679 PMCID: PMC2785771 DOI: 10.1186/1476-069x-8-52] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Accepted: 11/19/2009] [Indexed: 05/16/2023]
Abstract
Cyanobacteria can produce groups of structurally and functionally unrelated but highly potent toxins. Cyanotoxins are used in multiple research endeavours, either for direct investigation of their toxicologic properties, or as functional analogues for various biochemical and physiological processes. This paper presents occupational safety guidelines and recommendations for personnel working in field, laboratory or industrial settings to produce and use purified cyanotoxins and toxic cyanobacteria, from bulk harvesting of bloom material, mass culture of laboratory isolates, through routine extraction, isolation and purification. Oral, inhalational, dermal and parenteral routes are all potential occupational exposure pathways during the various stages of cyanotoxin production and application. Investigation of toxicologic or pharmacologic properties using in vivo models may present specific risks if radiolabelled cyanotoxins are employed, and the potential for occupational exposure via the dermal route is heightened with the use of organic solvents as vehicles. Inter- and intra-national transport of living cyanobacteria for research purposes risks establishing feral microalgal populations, so disinfection of culture equipment and destruction of cells by autoclaving, incineration and/or chlorination is recommended in order to prevent viable cyanobacteria from escaping research or production facilities.
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Affiliation(s)
- Ian Stewart
- Queensland Health Forensic and Scientific Services, 39 Kessels Road, Coopers Plains, Queensland 4108, Australia
- School of Public Health, Griffith University, Logan Campus, University Drive, Meadowbrook, Queensland 4131, Australia
| | - Wayne W Carmichael
- Department of Biological Sciences, Wright State University, 3640 Colonel Glen Highway, Dayton, Ohio 45435, USA
| | - Ross Sadler
- School of Public Health, Griffith University, Logan Campus, University Drive, Meadowbrook, Queensland 4131, Australia
| | - Glenn B McGregor
- Queensland Department of Environment and Resource Management, 120 Meiers Road, Indooroopilly, Queensland 4068, Australia
| | - Karen Reardon
- Queensland Health Forensic and Scientific Services, 39 Kessels Road, Coopers Plains, Queensland 4108, Australia
| | - Geoffrey K Eaglesham
- Queensland Health Forensic and Scientific Services, 39 Kessels Road, Coopers Plains, Queensland 4108, Australia
| | - Wasantha A Wickramasinghe
- The University of Queensland, National Research Centre for Environmental Toxicology, 39 Kessels Road, Coopers Plains, Queensland 4108, Australia
| | - Alan A Seawright
- The University of Queensland, National Research Centre for Environmental Toxicology, 39 Kessels Road, Coopers Plains, Queensland 4108, Australia
| | - Glen R Shaw
- School of Public Health, Griffith University, Gold Coast Campus, Parklands Drive, Southport, Queensland 4222, Australia
- Australian Rivers Institute, Griffith University, Gold Coast Campus, Parklands Drive, Southport, Queensland 4222, Australia
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22
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Osswald J, Carvalho AP, Claro J, Vasconcelos V. Effects of cyanobacterial extracts containing anatoxin-a and of pure anatoxin-a on early developmental stages of carp. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2009; 72:473-8. [PMID: 18640721 DOI: 10.1016/j.ecoenv.2008.05.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2007] [Revised: 05/19/2008] [Accepted: 05/23/2008] [Indexed: 05/23/2023]
Abstract
This study compares the effects of pure anatoxin-a and cyanobacterial extracts of an anatoxin-a producing strain on early stages of development of carp. Carp eggs were exposed from 2:30 h to 4 days post-fertilization to different ecologically relevant concentrations of anatoxin-a, provided as pure toxin or contained in the cyanobacterial extracts. Data on time to mortality, mortality rate, time to hatching, hatching rate, skeletal malformations rate, and larval standard length were registered until 8 days post-fertilization. At any tested concentration of anatoxin-a, the pure toxin was almost harmless to carp early stages of development, contrarily to cell extracts that were highly toxic. Only an adverse effect on the larval length was found at the highest concentration of pure toxin, while increasing concentrations of cell extracts caused increasing adverse effects in all the analyzed parameters. Anatoxin-a producing cyanobacteria should be regarded as putative modulators of aquatic ecosystems communities.
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Affiliation(s)
- J Osswald
- Interdisciplinary Centre of Marine and Environmental Research (CIMAR/CIIMAR), University of Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal
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23
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Tiecco M, Testaferri L, Bagnoli L, Scarponi C. Selenium-promoted synthesis of enantiopure octahydroindolizines, hexahydro-1H-pyrrolizines and hexahydro-3H-pyrrolizin-3-ones. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.10.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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24
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Boukouvalas J, Wang JX. Structure Revision and Synthesis of a Novel Labdane Diterpenoid from Zingiber ottensii. Org Lett 2008; 10:3397-9. [DOI: 10.1021/ol8011919] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John Boukouvalas
- Département de Chimie, Université Laval, Quebec City, Quebec G1K 7P4, Canada
| | - Jian-Xin Wang
- Département de Chimie, Université Laval, Quebec City, Quebec G1K 7P4, Canada
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25
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Toyooka N, Zhou D, Nemoto H. Enantioselective syntheses of (-)- and (+)-monomorine I. J Org Chem 2008; 73:4575-7. [PMID: 18507441 DOI: 10.1021/jo800593n] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A concise enantioselective total synthesis of unnatural (-)-monomorine I has been achieved starting from lactam 2 in 54% overall yield. Natural (+)-monomorine I was also synthesized.
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Affiliation(s)
- Naoki Toyooka
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Sugitani, Toyama, Japan.
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26
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Synthesis of six-membered oxygenated heterocycles through carbon–oxygen bond-forming reactions. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.11.092] [Citation(s) in RCA: 212] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Hjelmgaard T, Faure S, Lemoine P, Viossat B, Aitken DJ. Rapid Assembly of the Polyhydroxylated β-Amino Acid Constituents of Microsclerodermins C, D, and E. Org Lett 2008; 10:841-4. [DOI: 10.1021/ol702962z] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas Hjelmgaard
- Laboratoire de Synthèse et Etude de Systèmes d'Intérêt Biologique, SEESIB (UMR 6504 - CNRS), Université Blaise Pascal - Clermont-Ferrand 2, 24 avenue des Landais, 63177 Aubière cedex, France, Laboratoire de Cristallographie et RMN Biologiques (UMR 8015 - CNRS), Université René Descartes - Paris 5, 4 avenue de l'Observatoire, 75270 Paris cedex 06, France, and Laboratoire de Synthèse Organique et Méthodologie, ICMMO (UMR 8182 - CNRS), Université Paris-Sud 11, Bât. 420, 15 rue Georges Clemenceau, 91405
| | - Sophie Faure
- Laboratoire de Synthèse et Etude de Systèmes d'Intérêt Biologique, SEESIB (UMR 6504 - CNRS), Université Blaise Pascal - Clermont-Ferrand 2, 24 avenue des Landais, 63177 Aubière cedex, France, Laboratoire de Cristallographie et RMN Biologiques (UMR 8015 - CNRS), Université René Descartes - Paris 5, 4 avenue de l'Observatoire, 75270 Paris cedex 06, France, and Laboratoire de Synthèse Organique et Méthodologie, ICMMO (UMR 8182 - CNRS), Université Paris-Sud 11, Bât. 420, 15 rue Georges Clemenceau, 91405
| | - Pascale Lemoine
- Laboratoire de Synthèse et Etude de Systèmes d'Intérêt Biologique, SEESIB (UMR 6504 - CNRS), Université Blaise Pascal - Clermont-Ferrand 2, 24 avenue des Landais, 63177 Aubière cedex, France, Laboratoire de Cristallographie et RMN Biologiques (UMR 8015 - CNRS), Université René Descartes - Paris 5, 4 avenue de l'Observatoire, 75270 Paris cedex 06, France, and Laboratoire de Synthèse Organique et Méthodologie, ICMMO (UMR 8182 - CNRS), Université Paris-Sud 11, Bât. 420, 15 rue Georges Clemenceau, 91405
| | - Bernard Viossat
- Laboratoire de Synthèse et Etude de Systèmes d'Intérêt Biologique, SEESIB (UMR 6504 - CNRS), Université Blaise Pascal - Clermont-Ferrand 2, 24 avenue des Landais, 63177 Aubière cedex, France, Laboratoire de Cristallographie et RMN Biologiques (UMR 8015 - CNRS), Université René Descartes - Paris 5, 4 avenue de l'Observatoire, 75270 Paris cedex 06, France, and Laboratoire de Synthèse Organique et Méthodologie, ICMMO (UMR 8182 - CNRS), Université Paris-Sud 11, Bât. 420, 15 rue Georges Clemenceau, 91405
| | - David J. Aitken
- Laboratoire de Synthèse et Etude de Systèmes d'Intérêt Biologique, SEESIB (UMR 6504 - CNRS), Université Blaise Pascal - Clermont-Ferrand 2, 24 avenue des Landais, 63177 Aubière cedex, France, Laboratoire de Cristallographie et RMN Biologiques (UMR 8015 - CNRS), Université René Descartes - Paris 5, 4 avenue de l'Observatoire, 75270 Paris cedex 06, France, and Laboratoire de Synthèse Organique et Méthodologie, ICMMO (UMR 8182 - CNRS), Université Paris-Sud 11, Bât. 420, 15 rue Georges Clemenceau, 91405
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Roe SJ, Stockman RA. A two-directional approach to the anatoxin alkaloids: second synthesis of homoanatoxin and efficient synthesis of anatoxin-a. Chem Commun (Camb) 2008:3432-4. [DOI: 10.1039/b804304c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Osswald J, Rellán S, Gago A, Vasconcelos V. Toxicology and detection methods of the alkaloid neurotoxin produced by cyanobacteria, anatoxin-a. ENVIRONMENT INTERNATIONAL 2007; 33:1070-89. [PMID: 17673293 DOI: 10.1016/j.envint.2007.06.003] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2007] [Revised: 06/06/2007] [Accepted: 06/13/2007] [Indexed: 05/16/2023]
Abstract
Freshwater resources are under stress due to naturally occurring conditions and human impacts. One of the consequences is the proliferation of cyanobacteria, microphytoplankton organisms that are capable to produce toxins called cyanotoxins. Anatoxin-a is one of the main cyanotoxins. It is a very potent neurotoxin that was already responsible for some animal fatalities. In this review we endeavor to divulgate much of the internationally published information about toxicology, occurrence and detection methods of anatoxin-a. Cyanobacteria generalities, anatoxin-a occurrence and production as well as anatoxin-a toxicology and its methods of detection are the aspects focused in this review. Remediation of anatoxin-a occurrence will be addressed with a public health perspective. Final remarks call the attention for some important gaps in the knowledge about this neurotoxin and its implication to public health. Alterations of aquatic ecosystems caused by anatoxin-a is also addressed. Although anatoxin-a is not the more frequent cyanotoxin worldwide, it has to be regarded as a health risk that can be fatal to terrestrial and aquatic organisms because of its high toxicity.
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Affiliation(s)
- Joana Osswald
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Rua dos Bragas, 289, 4050-123 Porto, Portugal.
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Further studies on enantioselective synthesis of (+)-anatoxin-a using enyne metathesis: unexpected inversion of chirality via a skeletal rearrangement of 9-azabicyclo[4.2.1]nonene derivative. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.05.088] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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The Chemistry and Pharmacology of Anatoxin-a and Related Homotropanes with respect to Nicotinic Acetylcholine Receptors. Mar Drugs 2006. [DOI: 10.3390/md403228] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Hemming K, O’Gorman PA, Page MI. The synthesis of azabicyclo[4.2.1]nonenes by the addition of a cyclopropenone to 4-vinyl substituted 1-azetines—isomers of the homotropane nucleus. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2005.11.081] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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33
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Hjelmgaard T, Tanner D. Copper(i) mediated cross-coupling of amino acid derived organozinc reagents with acid chlorides. Org Biomol Chem 2006; 4:1796-805. [PMID: 16633572 DOI: 10.1039/b601996j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper describes the development of a straightforward experimental protocol for copper-mediated cross-coupling of amino acid derived beta-amido-alkylzinc iodides 1 and 3 with a range of acid chlorides. The present method uses CuCN.2LiCl as the copper source and for organozinc reagent 1 the methodology appears to be limited to reaction with more stable acid chlorides, providing the desired products in moderate yields. When applied to organozinc reagent 3, however, the protocol is more general and provides the products in good yields in all but one of the cases tested.
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Affiliation(s)
- Thomas Hjelmgaard
- Department of Chemistry, Technical University of Denmark, Lyngby, Denmark
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Kuznetsov NY, Khrustalev VN, Godovikov IA, Bubnov YN. Synthesis of Bridged Azabicycles from Pyridines and Pyrrole by a Diallylboration - Ring Closing Metathesis Sequence. European J Org Chem 2006. [DOI: 10.1002/ejoc.200500560] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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