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Sasaki M, Seida M, Umehara A. Convergent and Scalable Synthesis of the ABCDE-Ring Fragment of Caribbean Ciguatoxin C-CTX-1. J Org Chem 2023; 88:403-418. [PMID: 36537759 DOI: 10.1021/acs.joc.2c02414] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Convergent and scalable synthesis of the ABCDE-ring fragment of Caribbean ciguatoxin C-CTX-1, the major causative toxin for ciguatera poisoning in the Caribbean Sea and the Northeast Atlantic areas, is described in detail. The key features of the synthesis include an iterative use of 2,2,6,6-tetramethyl piperidine 1-oxyl (TEMPO)/PhI(OAc)2-mediated oxidative lactonization and Suzuki-Miyaura coupling en route to the DE-ring system and a convergent fragment coupling to form the ABCDE-ring skeleton via the Suzuki-Miyaura coupling strategy.
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Affiliation(s)
- Makoto Sasaki
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Miku Seida
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Atsushi Umehara
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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2
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Sasaki M, Iwasaki K, Arai K, Hamada N, Umehara A. Convergent Synthesis of the HIJKLMN-Ring Fragment of Caribbean Ciguatoxin C-CTX-1 by a Late-Stage Reductive Olefin Coupling Approach. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20220070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Makoto Sasaki
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577
| | - Kotaro Iwasaki
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577
| | - Keisuke Arai
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577
| | - Naoya Hamada
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577
| | - Atsushi Umehara
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577
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3
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Hort V, Abadie E, Arnich N, Dechraoui Bottein MY, Amzil Z. Chemodiversity of Brevetoxins and Other Potentially Toxic Metabolites Produced by Karenia spp. and Their Metabolic Products in Marine Organisms. Mar Drugs 2021; 19:656. [PMID: 34940655 PMCID: PMC8709462 DOI: 10.3390/md19120656] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 11/17/2021] [Accepted: 11/18/2021] [Indexed: 12/14/2022] Open
Abstract
In recent decades, more than 130 potentially toxic metabolites originating from dinoflagellate species belonging to the genus Karenia or metabolized by marine organisms have been described. These metabolites include the well-known and large group of brevetoxins (BTXs), responsible for foodborne neurotoxic shellfish poisoning (NSP) and airborne respiratory symptoms in humans. Karenia spp. also produce brevenal, brevisamide and metabolites belonging to the hemi-brevetoxin, brevisin, tamulamide, gymnocin, gymnodimine, brevisulcenal and brevisulcatic acid groups. In this review, we summarize the available knowledge in the literature since 1977 on these various identified metabolites, whether they are produced directly by the producer organisms or biotransformed in marine organisms. Their structures and physicochemical properties are presented and discussed. Among future avenues of research, we highlight the need for more toxin occurrence data with analytical techniques, which can specifically determine the analogs present in samples. New metabolites have yet to be fully described, especially the groups of metabolites discovered in the last two decades (e.g tamulamides). Lastly, this work clarifies the different nomenclatures used in the literature and should help to harmonize practices in the future.
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Affiliation(s)
- Vincent Hort
- Laboratory for Food Safety, Pesticides and Marine Biotoxins Unit, ANSES (French Agency for Food, Environmental and Occupational Health and Safety), 94701 Maisons-Alfort, France
| | - Eric Abadie
- MARBEC (MARine Biodiversity, Exploitation and Conservation), Université de Montpellier, CNRS, Ifremer, IRD, 34200 Sète, France;
| | - Nathalie Arnich
- Risk Assessment Directorate, ANSES (French Agency for Food, Environmental and Occupational Health and Safety), 94701 Maisons-Alfort, France;
| | - Marie-Yasmine Dechraoui Bottein
- Université Côte d’Azur, CNRS, UMR 7035 ECOSEAS, 06103 Nice, France;
- Federative Research Institute—Marine Ressources, Université Côte d’Azur, CNRS, 06108 Nice, France
| | - Zouher Amzil
- Ifremer (French Research Institute for Exploitation of the Sea), 44311 Nantes, France
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4
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Sasaki M, Iwasaki K, Arai K. Synthesis and Structural Implication of the JKLMN-Ring Fragment of Caribbean Ciguatoxin C-CTX-1. J Org Chem 2021; 86:4580-4597. [PMID: 33667088 DOI: 10.1021/acs.joc.0c03031] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Synthesis of the JKLMN-ring fragment of Caribbean ciguatoxin C-CTX-1, the causative toxin of ciguatera fish poisoning in the Caribbean Sea and the Northeast Atlantic areas, is described in detail. Key to the synthesis are a [2,3]-sigmatropic rearrangement to construct a seven-membered α-hydroxy exo-enol ether, stereoselective construction of an angular tetrasubstituted stereogenic center on the seven-membered M-ring by a hydrogen atom transfer-based reductive olefin coupling, Suzuki-Miyaura coupling of the KLMN-ring enol phosphate with a highly congested M-ring, and silica gel-mediated epoxide ring opening to form the J-ring. Comparison of the nuclear magnetic resonance spectroscopic data for the synthesized fragment with those for the natural product provided support for the formerly assigned structure of the N-ring in the right-hand terminal of C-CTX-1.
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Affiliation(s)
- Makoto Sasaki
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
| | - Kotaro Iwasaki
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
| | - Keisuke Arai
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
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5
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Conformerism, enantiomorphism and double catemer motifs in para-substituted nostoclide analogues. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.10.101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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6
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Sakai T, Matsushita S, Arakawa S, Mori K, Tanimoto M, Tokumasu A, Yoshida T, Mori Y. Total Synthesis of Gymnocin-A. J Am Chem Soc 2015; 137:14513-6. [PMID: 26521846 DOI: 10.1021/jacs.5b10082] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A convergent total synthesis of cytotoxic marine natural polycyclic ether, gymnocin-A (1), is described. The synthesis features three iterations of an oxiranyl anion strategy, involving base-mediated cycloetherification, ring expansion, and reductive etherification, for the construction of the FGH fragment and for its coupling with the ABC and KLMN fragments.
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Affiliation(s)
- Takeo Sakai
- Faculty of Pharmacy, Meijo University , Yagotoyama 150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Shingo Matsushita
- Faculty of Pharmacy, Meijo University , Yagotoyama 150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Shogo Arakawa
- Faculty of Pharmacy, Meijo University , Yagotoyama 150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Koichi Mori
- Faculty of Pharmacy, Meijo University , Yagotoyama 150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Miki Tanimoto
- Faculty of Pharmacy, Meijo University , Yagotoyama 150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Akihiro Tokumasu
- Faculty of Pharmacy, Meijo University , Yagotoyama 150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Tatsuji Yoshida
- Faculty of Pharmacy, Meijo University , Yagotoyama 150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Yuji Mori
- Faculty of Pharmacy, Meijo University , Yagotoyama 150, Tempaku-ku, Nagoya 468-8503, Japan
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7
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Armbrust KW, Beaver MG, Jamison TF. Rhodium-catalyzed endo-selective epoxide-opening cascades: formal synthesis of (-)-brevisin. J Am Chem Soc 2015; 137:6941-6. [PMID: 25984951 DOI: 10.1021/jacs.5b03570] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Rh(CO)2Cl]2 is as an effective catalyst for endo-selective cyclizations and cascades of epoxy-(E)-enoate alcohols, thus enabling the synthesis of oxepanes and oxepane-containing polyethers from di- and trisubstituted epoxides. Syntheses of the ABC and EF ring systems of (-)-brevisin via all endo-diepoxide-opening cascades using this method constitute a formal total synthesis and demonstrate the utility of this methodology in the context of the synthesis of marine ladder polyether natural products.
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Affiliation(s)
- Kurt W Armbrust
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Matthew G Beaver
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Timothy F Jamison
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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Lanier ML, Kasper AC, Kim H, Hong J. Synthesis of α,α'-trans-oxepanes through an organocatalytic oxa-conjugate addition reaction. Org Lett 2014; 16:2406-9. [PMID: 24724535 PMCID: PMC4018174 DOI: 10.1021/ol500773w] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
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Oxepanes
are found in a wide range of natural products; however,
they are challenging synthetic targets due to enthalpic and entropic
barriers. Organocatalytic oxa-conjugate addition reactions promoted
by the gem-disubstituent (Thorpe–Ingold) effect
stereoselectively provided α,α′-trans-oxepanes. In addition, the potential of an organocatalytic tandem
oxa-conjugate addition/α-oxidation was demonstrated in a rapid
generation of molecular complexity. These organocatalytic oxa-conjugate
addition reactions would provide powerful tools for the synthesis
of natural products that contain highly functionalized oxepanes.
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Affiliation(s)
- Megan L Lanier
- Department of Chemistry, Duke University , Durham, North Carolina 27708, United States
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10
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Sakai T, Asano H, Furukawa K, Oshima R, Mori Y. Synthesis of the KLMN Fragment of Gymnocin-A Using Oxiranyl Anion Convergent Methodology. Org Lett 2014; 16:2268-71. [DOI: 10.1021/ol500788c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takeo Sakai
- Faculty
of Pharmacy, Meijo University, Yagotoyama
150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Haruka Asano
- Faculty
of Pharmacy, Meijo University, Yagotoyama
150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Kyoko Furukawa
- Faculty
of Pharmacy, Meijo University, Yagotoyama
150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Rie Oshima
- Faculty
of Pharmacy, Meijo University, Yagotoyama
150, Tempaku-ku, Nagoya 468-8503, Japan
| | - Yuji Mori
- Faculty
of Pharmacy, Meijo University, Yagotoyama
150, Tempaku-ku, Nagoya 468-8503, Japan
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11
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Satake M, Shirai T, Takimoto Y, Kuranaga T, Tachibana K, G. Baden D, L. C. Wright J. Synthesis and Cyclization of a Proposed Biosynthetic Epoxy Intermediate of a Marine Monocyclic Ether Amide, Brevisamide. HETEROCYCLES 2014. [DOI: 10.3987/com-13-12880] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Abstract
This review covers the literature published in 2011 for marine natural products, with 870 citations (558 for the period January to December 2011) 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 (1152 for 2011), 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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15
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Sakai T, Sugimoto A, Tatematsu H, Mori Y. Divergent synthesis of trans-fused polycyclic ethers by a convergent oxiranyl anion strategy. J Org Chem 2012; 77:11177-91. [PMID: 23214941 DOI: 10.1021/jo302267f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Octacyclic polyethers that correspond to the CDEFGHIJ-ring system of yessotoxin as well as G- and/or I-ring-modified analogues were synthesized in a divergent manner, starting from a common intermediate, using an [X + 2 + Y]-type convergent method. Reaction of a triflate with the oxiranyl anion generated from an epoxy sulfone, followed by ring expansion, allowed for the incorporation of medium-sized ring ethers into the key intermediate. Subsequent acetal formation and reductive etherification afforded various octacycles containing seven- and eight-membered ether rings.
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Affiliation(s)
- Takeo Sakai
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
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16
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Seidel G, Fürstner A. Suzuki reactions of extended scope: the ‘9-MeO-9-BBN variant’ as a complementary format for cross-coupling. Chem Commun (Camb) 2012; 48:2055-70. [DOI: 10.1039/c2cc17070a] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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17
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Fuwa H, Ebine M, Sasaki M. Recent Applications of the Suzuki-Miyaura Cross-coupling to Complex Polycyclic Ether Synthesis. J SYN ORG CHEM JPN 2011. [DOI: 10.5059/yukigoseikyokaishi.69.1251] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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