1
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Affiliation(s)
- Alexey V. Dobrydnev
- Enamine Ltd (www.enamine.net) Chervonotkatska Street 78 Kyiv 02660 Ukraine
- Taras Shevchenko National University of Kyiv Lva Tolstoho Street 12 01033 Kyiv Ukraine
| | - José Marco‐Contelles
- Laboratory of Free Radicals IQOG, CSIC C/Juan de la Cierva, 3 28006 Madrid Spain
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2
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Affiliation(s)
- Guillaume Pisella
- Laboratory of Catalysis and Organic Synthesis, Institut des Sciences et Ingénierie Chimique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Alec Gagnebin
- Laboratory of Catalysis and Organic Synthesis, Institut des Sciences et Ingénierie Chimique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis, Institut des Sciences et Ingénierie Chimique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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3
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Johnson TA, Morris JD, Coppage DA, Cook CV, Persi LN, Ogarrio MA, Garcia TC, McIntosh NL, McCauley EP, Media J, Maheshwari M, Valeriote FA, Shaw J, Crews P. Reinvestigation of Mycothiazole Reveals the Penta-2,4-dien-1-ol Residue Imparts Picomolar Potency and 8 S Configuration. ACS Med Chem Lett 2020; 11:108-113. [PMID: 32071675 DOI: 10.1021/acsmedchemlett.9b00302] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 01/02/2020] [Indexed: 12/18/2022] Open
Abstract
Reinvestigation of mycothiazole (1) revealed picomolar potency (IC50 = 0.00016, 0.00027, 0.00035 μM) against pancreatic, (PANC-1), liver (HepG2), and colon (HCT-116) tumor cell lines. Reevaluation of 1 provided [α]D data indicating Vanuatu specimens of C. mycofijiensis contain the 8S enantiomer of 1 and not the 8R configuration previously reported. Semisynthesis provided 8-O-acetylmycothiazole (2), 8-oxomycothiazole (8), mycothiazole nitrosobenzene derivatives (MND1, MND2: 9a, 9b), and MND3 (10) with IC50 = 0.00129, >1.0, >1.0, >1.0, >1.0 μM, respectively, against PANC-1 cell lines. These results highlight the significance of the penta-2,4-dien-1-ol residue as a key structural feature of 1 required for its cytotoxicty against tumor cell lines.
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Affiliation(s)
- Tyler A. Johnson
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
| | - Joseph D. Morris
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - David A. Coppage
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
| | - Colon V. Cook
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Lauren N. Persi
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Marcos A. Ogarrio
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Taylor C. Garcia
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Nicole L. McIntosh
- Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States
| | - Erin P. McCauley
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
| | - Joseph Media
- Josephine Ford Cancer Center, Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Health System, Detroit, Michigan 48202, United States
| | - Mani Maheshwari
- Josephine Ford Cancer Center, Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Health System, Detroit, Michigan 48202, United States
| | - Frederick A. Valeriote
- Josephine Ford Cancer Center, Division of Hematology and Oncology, Department of Internal Medicine, Henry Ford Health System, Detroit, Michigan 48202, United States
| | - Jiajiu Shaw
- 21st Century Therapeutics, 440 Burroughs, Suite 447, Detroit, Michigan 48202, United States
| | - Phillip Crews
- Department of Chemistry & Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
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4
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Morrison RJ, van der Mei FW, Romiti F, Hoveyda AH. A Catalytic Approach for Enantioselective Synthesis of Homoallylic Alcohols Bearing a Z-Alkenyl Chloride or Trifluoromethyl Group. A Concise and Protecting Group-Free Synthesis of Mycothiazole. J Am Chem Soc 2019; 142:436-447. [PMID: 31873000 DOI: 10.1021/jacs.9b11178] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A protecting group-free strategy is presented for diastereo- and enantioselective routes that can be used to prepare a wide variety of Z-homoallylic alcohols with significantly higher efficiency than is otherwise feasible. The approach entails the merger of several catalytic processes and is expected to facilitate the preparation of bioactive organic molecules. More specifically, Z-chloro-substituted allylic pinacolatoboronate is first obtained through stereoretentive cross-metathesis between Z-crotyl-B(pin) (pin = pinacolato) and Z-dichloroethene, both of which are commercially available. The organoboron compound may be used in the central transformation of the entire approach, an α- and enantioselective addition to an aldehyde, catalyzed by a proton-activated, chiral aminophenol-boryl catalyst. Catalytic cross-coupling can then furnish the desired Z-homoallylic alcohol in high enantiomeric purity. The olefin metathesis step can be carried out with substrates and a Mo-based complex that can be purchased. The aminophenol compound that is needed for the second catalytic step can be prepared in multigram quantities from inexpensive starting materials. A significant assortment of homoallylic alcohols bearing a Z-F3C-substituted alkene can also be prepared with similar high efficiency and regio-, diastereo-, and enantioselectivity. What is more, trisubstituted Z-alkenyl chloride moiety can be accessed with similar efficiency albeit with somewhat lower α-selectivity and enantioselectivity. The general utility of the approach is underscored by a succinct, protecting group-free, and enantioselective total synthesis of mycothiazole, a naturally occurring anticancer agent through a sequence that contains a longest linear sequence of nine steps (12 steps total), seven of which are catalytic, generating mycothiazole in 14.5% overall yield.
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Affiliation(s)
- Ryan J Morrison
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Farid W van der Mei
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Filippo Romiti
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States.,Supramolecular Science and Engineering Institute , University of Strasbourg, CNRS , Strasbourg 67000 , France
| | - Amir H Hoveyda
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States.,Supramolecular Science and Engineering Institute , University of Strasbourg, CNRS , Strasbourg 67000 , France
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5
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Yu C, Lv Z, Xu S, Zhang J. A convenient synthesis of ( E )-conjugated polyene sulfonyl derivatives with excellent stereospecificity. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.05.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Uzelac EJ, Rasmussen SC. Synthesis of Brominated Thiazoles via Sequential Bromination-Debromination Methods. J Org Chem 2017; 82:5947-5951. [PMID: 28508637 DOI: 10.1021/acs.joc.7b00495] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis of the full family of bromothiazoles has been revisited in order to update and optimize their production. The species reported include 2-bromothiazole, 4-bromothiazole, 5-bromothiazole, 2,4-dibromothiazole, 2,5-dibromothiazole, 4,5-dibromothiazole, and 2,4,5-tribromothiazole, the majority of which are produced via sequential bromination and debromination steps. This complete family can now be produced without the use of elemental bromine, and the presented methods have allowed the physical and NMR spectroscopic characterization of the full family to be reported for the first time.
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Affiliation(s)
- Eric J Uzelac
- Department of Chemistry and Biochemistry, North Dakota State University , NDSU Department 2735, P.O. Box 6050, Fargo, North Dakota 58108-6050, United States
| | - Seth C Rasmussen
- Department of Chemistry and Biochemistry, North Dakota State University , NDSU Department 2735, P.O. Box 6050, Fargo, North Dakota 58108-6050, United States
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7
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Rad-Moghadam K, Hassani SARM, Roudsari ST. N-methyl-2-pyrrolidonium chlorosulfonate: An efficient ionic-liquid catalyst and mild sulfonating agent for one-pot synthesis of δ-sultones. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.02.082] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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8
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Alcaide B, Almendros P, Aragoncillo C, Fernández I, Gómez-Campillos G. Metal-Free Allene-Based Synthesis of Enantiopure Fused Polycyclic Sultones. Chemistry 2015; 22:285-94. [PMID: 26592734 DOI: 10.1002/chem.201504045] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Indexed: 01/04/2023]
Affiliation(s)
- Benito Alcaide
- Grupo de Lactamas y Heterociclos Bioactivos, Departamento de Química Orgánica I, Unidad Asociada al CSIC, Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid (Spain).
| | - Pedro Almendros
- Instituto de Química Orgánica General, Consejo Superior de Investigaciones Científicas, IQOG-CSIC, Juan de la Cierva 3, 28006 Madrid (Spain).
| | - Cristina Aragoncillo
- Grupo de Lactamas y Heterociclos Bioactivos, Departamento de Química Orgánica I, Unidad Asociada al CSIC, Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid (Spain)
| | - Israel Fernández
- Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid (Spain)
| | - Gonzalo Gómez-Campillos
- Grupo de Lactamas y Heterociclos Bioactivos, Departamento de Química Orgánica I, Unidad Asociada al CSIC, Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid (Spain)
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9
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Wang L, Hale KJ. Total Synthesis of the Potent HIF-1 Inhibitory Antitumor Natural Product, (8R)-Mycothiazole, via Baldwin-Lee CsF/CuI sp(3)-sp(2)-Stille Cross-Coupling. Confirmation of the Crews Reassignment. Org Lett 2015; 17:4200-3. [PMID: 26271336 DOI: 10.1021/acs.orglett.5b01966] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A convenient asymmetric total synthesis of the potent HIF-1 inhibitory antitumor natural product, (-)- or (+)-(8R)-mycothiazole (1), is described. Not only does our synthesis confirm the 2006 structural reassignment made by Crews ( Crews , P. , et al. J. Nat. Prod. 2006 , 69 , 145 ), it revises the [α]D data previously reported for this molecule in MeOH from -13.7° to +42.3°. The newly developed route to (8R)-1 sets the C(8)-OH stereocenter via Sharpless AE/2,3-epoxy alcohol reductive ring opening and utilizes two Baldwin-Lee CsF/cat. CuI Stille cross-coupling reactions with vinylstannanes 8 and 3 to efficiently elaborate the C(1)-C(4) and C(14)-C(18) sectors.
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Affiliation(s)
- Liping Wang
- The School of Chemistry & Chemical Engineering and the Centre for Cancer Research and Cell Biology (CCRCB), the Queen's University Belfast , Stranmillis Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
| | - Karl J Hale
- The School of Chemistry & Chemical Engineering and the Centre for Cancer Research and Cell Biology (CCRCB), the Queen's University Belfast , Stranmillis Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
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10
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Danilkina NA, Lyapunova AG, Khlebnikov AF, Starova GL, Bräse S, Balova IA. Ring-Closing Metathesis of Co2(CO)6–Alkyne Complexes for the Synthesis of 11-Membered Dienediynes: Overcoming Thermodynamic Barriers. J Org Chem 2015; 80:5546-55. [DOI: 10.1021/acs.joc.5b00409] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Natalia A. Danilkina
- Institute
of Chemistry, Saint Petersburg State University, Universitetskiy pr. 26, 198504 Saint Petersburg, Russia
| | - Anna G. Lyapunova
- Institute
of Chemistry, Saint Petersburg State University, Universitetskiy pr. 26, 198504 Saint Petersburg, Russia
| | - Alexander F. Khlebnikov
- Institute
of Chemistry, Saint Petersburg State University, Universitetskiy pr. 26, 198504 Saint Petersburg, Russia
| | - Galina L. Starova
- Institute
of Chemistry, Saint Petersburg State University, Universitetskiy pr. 26, 198504 Saint Petersburg, Russia
| | - Stefan Bräse
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology, Campus
South, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
- Institute
of Toxicology and Genetics, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Irina A. Balova
- Institute
of Chemistry, Saint Petersburg State University, Universitetskiy pr. 26, 198504 Saint Petersburg, Russia
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11
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Mondal S, Debnath S, Das B. Synthesis of seven-membered fused sultones by reductive Heck cyclization: an investigation for stereochemistry through DFT study. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.11.068] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Parkhurst RR, Balog S, Weder C, Simon YC. Synthesis of poly(sulfonate ester)s by ADMET polymerization. RSC Adv 2014. [DOI: 10.1039/c4ra08788g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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13
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Danilkina NA, Kulyashova AE, Khlebnikov AF, Bräse S, Balova IA. Electrophilic Cyclization of Aryldiacetylenes in the Synthesis of Functionalized Enediynes Fused to a Heterocyclic Core. J Org Chem 2014; 79:9018-45. [DOI: 10.1021/jo501396s] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- N. A. Danilkina
- Institute
of Chemistry, Saint Petersburg State University, Universitetskiy pr. 26, 198504 Saint Petersburg, Russia
| | - A. E. Kulyashova
- Institute
of Chemistry, Saint Petersburg State University, Universitetskiy pr. 26, 198504 Saint Petersburg, Russia
| | - A. F. Khlebnikov
- Institute
of Chemistry, Saint Petersburg State University, Universitetskiy pr. 26, 198504 Saint Petersburg, Russia
| | - S. Bräse
- Institute
of Organic Chemistry, Karlsruhe Institute of Technology, Campus South, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - I. A. Balova
- Institute
of Chemistry, Saint Petersburg State University, Universitetskiy pr. 26, 198504 Saint Petersburg, Russia
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14
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Walleser P, Brückner R. Stereocontrolled Synthesis of a C1-C10Building Block (“Southwestern Moiety”) for the Unnatural Enantiomers of the Polyene Polyol Antibiotics Filipin III and Pentamycin: A Sultone-Forming Ring-Closing Metathesis for Protection of Homoallylic Alcohols. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400145] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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16
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Ghandi M, Taghi Nazeri M, Kubicki M. An efficient one-pot, regio- and stereoselective synthesis of novel pentacyclic-fused pyrano[3,2,c]chromenone or quinolinone benzosultone derivatives in water. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.04.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Nishimura RH, Toledo FT, Lopes JL, Clososki GC. Efficient synthesis of chlorohydrins using ClCH2MgCl·LiCl. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2012.10.132] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Affiliation(s)
- Shovan Mondal
- Institut de Chimie Radicalaire,
CNRS UMR 7273, Equipe
CMO, Aix-Marseille Université, 13397 Cedex 20, Marseille, France
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19
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Ghandi M, Taheri A, Hasani Bozcheloei A, Abbasi A, Kia R. Synthesis of novel tricyclic and tetracyclic sultone scaffolds via intramolecular 1,3-dipolar cycloaddition reactions. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.02.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Ghandi M, Bozcheloei AH, Nazari SH, Sadeghzadeh M. Solvent-Dependent Reactions for the Synthesis of β-Keto-Benzo-δ-Sultone Scaffolds via DBU-Catalyzed O-Sulfonylation/Intramolecular Baylis–Hillman/1,3-H Shift or Dehydration Tandem Sequences. J Org Chem 2011; 76:9975-82. [DOI: 10.1021/jo201506d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mehdi Ghandi
- School
of Chemistry, College of Science, University of Tehran, P.O. Box 14155 6455, Tehran,
Iran
| | | | - Seyed Hadi Nazari
- School
of Chemistry, College of Science, University of Tehran, P.O. Box 14155 6455, Tehran,
Iran
| | - Masoud Sadeghzadeh
- School
of Chemistry, College of Science, University of Tehran, P.O. Box 14155 6455, Tehran,
Iran
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21
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Batt F, Fache F. Towards the Synthesis of the 4,19-Diol Derivative of (-)-Mycothiazole: Synthesis of a Potential Key Intermediate. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100669] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Morgan JB, Mahdi F, Liu Y, Coothankandaswamy V, Jekabsons MB, Johnson TA, Sashidhara KV, Crews P, Nagle DG, Zhou YD. The marine sponge metabolite mycothiazole: a novel prototype mitochondrial complex I inhibitor. Bioorg Med Chem 2010; 18:5988-94. [PMID: 20637638 DOI: 10.1016/j.bmc.2010.06.072] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2010] [Revised: 06/18/2010] [Accepted: 06/21/2010] [Indexed: 11/24/2022]
Abstract
A natural product chemistry-based approach was applied to discover small-molecule inhibitors of hypoxia-inducible factor-1 (HIF-1). A Petrosaspongia mycofijiensis marine sponge extract yielded mycothiazole (1), a solid tumor selective compound with no known mechanism for its cell line-dependent cytotoxic activity. Compound 1 inhibited hypoxic HIF-1 signaling in tumor cells (IC(50) 1nM) that correlated with the suppression of hypoxia-stimulated tumor angiogenesis in vitro. However, 1 exhibited pronounced neurotoxicity in vitro. Mechanistic studies revealed that 1 selectively suppresses mitochondrial respiration at complex I (NADH-ubiquinone oxidoreductase). Unlike rotenone, MPP(+), annonaceous acetogenins, piericidin A, and other complex I inhibitors, mycothiazole is a mixed polyketide/peptide-derived compound with a central thiazole moiety. The exquisite potency and structural novelty of 1 suggest that it may serve as a valuable molecular probe for mitochondrial biology and HIF-mediated hypoxic signaling.
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Affiliation(s)
- J Brian Morgan
- Department of Pharmacognosy, School of Pharmacy, University of Mississippi, University, MS 38677, USA
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23
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Shi B, Merten S, Wong DK, Chu JC, Liu LL, Lam SK, Jäger A, Wong WT, Chiu P, Metz P. The Rhodium-Catalyzed Carbene Cyclization Cycloaddition Cascade Reaction of Vinylsulfonates. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900695] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Majumdar K, Mondal S, Ghosh D. Synthesis of tricyclic and tetracyclic sultones by Pd-catalyzed intramolecular cyclization. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.06.028] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Siméon FG, Wendahl MT, Pike VW. Efficient and regioselective halogenations of 2-amino-1,3-thiazoles with copper salts. J Org Chem 2009; 74:2578-80. [PMID: 19231816 DOI: 10.1021/jo802799c] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Monohalo and dihalo 1,3-thiazole derivatives can be efficiently and selectively prepared under mild conditions from 2-amino-1,3-thiazoles. Halogenations proceed easily in the presence of copper(I) or copper(II) chlorides, bromides, or iodides directly in solution or with supported copper halides.
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Affiliation(s)
- Fabrice G Siméon
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Building 10, Room B3C346A, 10 Center Drive, Bethesda, Maryland 20892-1003, USA.
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26
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Blunt JW, Copp BR, Hu WP, Munro MHG, Northcote PT, Prinsep MR. Marine natural products. Nat Prod Rep 2008; 25:35-94. [PMID: 18250897 DOI: 10.1039/b701534h] [Citation(s) in RCA: 284] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This review covers the literature published in 2006 for marine natural products, with 758 citations (534 for the period January to December 2006) referring to compounds isolated from marine microorganisms and phytoplankton, green algae, brown algae, red algae, sponges, cnidaria, bryozoans, molluscs, tunicates and echinoderms. The emphasis is on new compounds (779 for 2006), together with their 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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28
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Rega M, Candal P, Jiménez C, Rodríguez J. Mycothiazole: Synthesis of the C8–C18 Subunit and Further Evidence of the (Z)-Δ14 Double Bond Configuration. European J Org Chem 2007. [DOI: 10.1002/ejoc.200600671] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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29
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Abstract
An analog of mycothiazole and pseudotrienic acid B were synthesized efficiently by using ring-closing metathesis or cross-metathesis as key reactions.
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