1
|
Hashimoto N, Taguchi J, Arichi N, Inuki S, Ohno H. Gold(I)-Catalyzed Cascade Cyclization of Alkynyl Indoles for the Stereoselective Construction of the Quaternary Carbon Center of Akuammiline Alkaloids. J Org Chem 2023. [PMID: 38051730 DOI: 10.1021/acs.joc.3c02142] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
A gold-catalyzed cyclization reaction of alkynyl-indoles has been developed for the stereoselective construction of the quaternary carbon center of fused indolines. This reaction efficiently produces fused indolines via diastereoselective 6-endo-dig cyclization controlled by a bulky TIPS group, followed by nucleophilic attack of the carboxy group on the resulting imine. The lactone moiety of the fused indoline can be reductively cleaved to produce a tricyclic indoline, which could be useful for the synthesis of akuammiline alkaloids.
Collapse
Affiliation(s)
- Naoki Hashimoto
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Junichi Taguchi
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Norihito Arichi
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Shinsuke Inuki
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hiroaki Ohno
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| |
Collapse
|
2
|
Toward the Total Synthesis of Scytophycins: Synthesis of the C7–C21 Fragments of Scytophycins A, B, and C. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
3
|
Harris CM, Krock B, Tillmann U, Tainter CJ, Stec DF, Andersen AJC, Larsen TO, Reece KS, Harris TM. Alkali Metal- and Acid-Catalyzed Interconversion of Goniodomin A with Congeners B and C. JOURNAL OF NATURAL PRODUCTS 2021; 84:2554-2567. [PMID: 34520205 DOI: 10.1021/acs.jnatprod.1c00586] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Goniodomin A (GDA, 1) is a phycotoxin produced by at least four species of Alexandrium dinoflagellates that are found globally in brackish estuaries and lagoons. It is a linear polyketide with six oxygen heterocyclic rings that is cyclized into a macrocyclic structure via lactone formation. Two of the oxygen heterocycles in 1 comprise a spiro-bis-pyran, whereas goniodomin B (GDB) contains a 2,7-dioxabicyclo[3.3.1]nonane ring system fused to a pyran. When H2O is present, 1 undergoes facile conversion to isomer GDB and to an α,β-unsaturated ketone, goniodomin C (GDC, 7). GDB and GDC can be formed from GDA by cleavage of the spiro-bis-pyran ring system. GDA, but not GDB or GDC, forms a crown ether-type complex with K+. Equilibration of GDA with GDB and GDC is observed in the presence of H+ and of Na+, but the equilibrated mixtures revert to GDA upon addition of K+. Structural differences have been found between the K+ and Na+ complexes. The association of GDA with K+ is strong, while that with Na+ is weak. The K+ complex has a compact, well-defined structure, whereas Na+ complexes are an ill-defined mixture of species. Analyses of in vitro A. monilatum and A. hiranoi cultures indicate that only GDA is present in the cells; GDB and GDC appear to be postharvest transformation products.
Collapse
Affiliation(s)
- Constance M Harris
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Bernd Krock
- Alfred Wegener Institut-Helmholtz Zentrum für Polar- und Meeresforschung (AWI), Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Urban Tillmann
- Alfred Wegener Institut-Helmholtz Zentrum für Polar- und Meeresforschung (AWI), Am Handelshafen 12, 27570 Bremerhaven, Germany
| | - Craig J Tainter
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Donald F Stec
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Aaron J C Andersen
- Department of Biotechnology and Biomedicine, Søltofts Plads, Technical University of Denmark, 2800 Kgs., Lyngby, Denmark
| | - Thomas O Larsen
- Department of Biotechnology and Biomedicine, Søltofts Plads, Technical University of Denmark, 2800 Kgs., Lyngby, Denmark
| | - Kimberly S Reece
- Virginia Institute of Marine Science (VIMS), William & Mary, Gloucester Point, Virginia 23062, United States
| | - Thomas M Harris
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
- Virginia Institute of Marine Science (VIMS), William & Mary, Gloucester Point, Virginia 23062, United States
| |
Collapse
|
4
|
Tainter CJ, Schley ND, Harris CM, Stec DF, Song AK, Balinski A, May JC, McLean JA, Reece KS, Harris TM. Algal Toxin Goniodomin A Binds Potassium Ion Selectively to Yield a Conformationally Altered Complex with Potential Biological Consequences. JOURNAL OF NATURAL PRODUCTS 2020; 83:1069-1081. [PMID: 32083860 PMCID: PMC9290314 DOI: 10.1021/acs.jnatprod.9b01094] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The marine toxin goniodomin A (GDA) is a polycyclic macrolide containing a spiroacetal and three cyclic ethers as part of the macrocycle backbone. GDA is produced by three species of the Alexandrium genus of dinoflagellates, blooms of which are associated with "red tides", which are widely dispersed and can cause significant harm to marine life. The toxicity of GDA has been attributed to stabilization of the filamentous form of the actin group of structural proteins, but the structural basis for its binding is not known. Japanese workers, capitalizing on the assumed rigidity of the heavily substituted macrolide ring, assigned the relative configuration and conformation by relying on NMR coupling constants and NOEs; the absolute configuration was assigned by degradation to a fragment that was compared with synthetic material. We have confirmed the absolute structure and broad features of the conformation by X-ray crystallography but have found GDA to complex with alkali metal ions in spite of two of the heterocyclic rings facing outward. Such an arrangement would have been expected to impair the ability of GDA to form a crown-ether-type multidentate complex. GDA shows preference for K+, Rb+, and Cs+ over Li+ and Na+ in determinations of relative affinities by TLC on metal-ion-impregnated silica gel plates and by electrospray mass spectrometry. NMR studies employing the K+ complex of GDA, formed from potassium tetrakis[pentafluorophenyl]borate (KBArF20), reveal a major alteration of the conformation of the macrolide ring. These observations argue against the prior assumption of rigidity of the ring. Alterations in chemical shifts, coupling constants, and NOEs indicate the involvement of most of the molecule other than ring F. Molecular mechanics simulations suggest K+ forms a heptacoordinate complex involving OA, OB, OC, OD, OE, and the C-26 and C-27 hydroxy groups. We speculate that complexation of K+ with GDA electrostatically stabilizes the complex of GDA with filamentous actin in marine animals due to the protein being negatively charged at physiological pH. GDA may also cause potassium leakage through cell membranes. This study provides insight into the structural features and chemistry of GDA that may be responsible for significant ecological damage associated with the GDA-producing algal blooms.
Collapse
Affiliation(s)
- Craig J. Tainter
- Department of Chemistry, Vanderbilt University, Nashville,
TN 37235, USA
| | - Nathan D. Schley
- Department of Chemistry, Vanderbilt University, Nashville,
TN 37235, USA
| | | | - Donald F. Stec
- Department of Chemistry, Vanderbilt University, Nashville,
TN 37235, USA
| | - Anna K. Song
- Department of Aquatic Health Sciences, Virginia Institute
of Marine Science, Gloucester Point, VA 23062, USA
| | - Andrzej Balinski
- Department of Chemistry, Vanderbilt University, Nashville,
TN 37235, USA
| | - Jody C. May
- Department of Chemistry, Vanderbilt University, Nashville,
TN 37235, USA
| | - John A. McLean
- Department of Chemistry, Vanderbilt University, Nashville,
TN 37235, USA
| | - Kimberly S. Reece
- Department of Aquatic Health Sciences, Virginia Institute
of Marine Science, Gloucester Point, VA 23062, USA
| | - Thomas M. Harris
- Department of Chemistry, Vanderbilt University, Nashville,
TN 37235, USA
- Department of Aquatic Health Sciences, Virginia Institute
of Marine Science, Gloucester Point, VA 23062, USA
| |
Collapse
|
5
|
Cytotoxicity of goniodomin A and B in non contractile cells. Toxicol Lett 2016; 250-251:10-20. [PMID: 27050798 DOI: 10.1016/j.toxlet.2016.04.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 03/30/2016] [Accepted: 04/01/2016] [Indexed: 11/24/2022]
Abstract
Goniodomin A is a phycotoxin produced by the dinoflagellates Alexandrium hiranoi (formerly Goniodoma pseudogoniaulax) and Alexandrium monilatum. This polyether macrolide exerts a potent antifungal effect and disturbs the actomyosin ATPase activity and the F-actin meshwork in diverse cell types. Goniodomin B is a fused acetal isomer isolated with goniodomin A with unknown activity. Histopathological changes induced by goniodomin A postulated hepatocytes as target cells. In this study both compounds induce a time and concentration dependent fall in the viability of Clone 9 rat hepatocytes. Furthermore, for both compounds, primary rat hepatocytes are almost 10 folds less sensitive than Clone 9 cells. Goniodomin A is highly effective in the nanomolar range while micromolar concentrations of goniodomin B are necessary to observe cytoxicity. Additionally, goniodomin A induced a significant increase in the F-actin and decrease in the G-actin content of Clone 9 cells but did not change the actin of primary cultured hepatocytes. However, goniodomin B could not exert significant alterations in the cytoskeleton of neither cell type. Futhermore goniodomin A as well as goniodomin B are cytotoxic to excitable cells. Both analogues triggered a time dependent decrease on viability in BE(2)-M17 human neuroblastoma cells. In this cell model goniodomin A increased the intracellular calcium and depolarized cells. We conclude that goniodomins A and B are biologically active molecules in hepatocytes and also in excitable cells BE(2)-M17. However, the analogue goniodomin B, whose activity is described in this work for the first time, is a much less potent compound.
Collapse
|
6
|
Fuwa H, Matsukida S, Miyoshi T, Kawashima Y, Saito T, Sasaki M. Progress toward the Total Synthesis of Goniodomin A: Stereocontrolled, Convergent Synthesis of the C12–C36 Fragment. J Org Chem 2016; 81:2213-27. [DOI: 10.1021/acs.joc.5b02650] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haruhiko Fuwa
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Seiji Matsukida
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Taro Miyoshi
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Yuki Kawashima
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Tomoyuki Saito
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Makoto Sasaki
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| |
Collapse
|
7
|
Fenneteau J, Vallerotto S, Ferrié L, Figadère B. Liebeskind–Srogl cross-coupling on γ-carboxyl-γ-butyrolactone derivatives: application to the side chain of amphidinolides C and F. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.04.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
8
|
Someya CI, Weidauer M, Enthaler S. Nickel-catalyzed C(sp2)–C(sp2) Cross Coupling Reactions of Sulfur-Functionalities and Grignard Reagents. Catal Letters 2013. [DOI: 10.1007/s10562-013-0979-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
9
|
Nakajima M, Fuwa H, Sasaki M. Stereoselective Synthesis of the C1–C16 Fragment of Goniodomin A. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2012. [DOI: 10.1246/bcsj.20120152] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
10
|
|
11
|
A new strategy for the synthesis of substituted dihydropyrones and tetrahydropyrones via palladium-catalyzed coupling of thioesters. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.03.114] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
12
|
Fuwa H, Nakajima M, Shi J, Takeda Y, Saito T, Sasaki M. A Convergent Synthesis of the C1−C16 Segment of Goniodomin A via Palladium-Catalyzed Organostannane−Thioester Coupling. Org Lett 2011; 13:1106-9. [DOI: 10.1021/ol1031409] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Haruhiko Fuwa
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Motohiro Nakajima
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Jinglu Shi
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Yoshiyuki Takeda
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Tomoyuki Saito
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Makoto Sasaki
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| |
Collapse
|