351
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352
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353
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Xie Y, Floreancig PE. Cascade Approach to Stereoselective Polycyclic Ether Formation: Epoxides as Trapping Agents in the Transposition of Allylic Alcohols. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201208132] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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354
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Brusoe AT, Edwankar RV, Alexanian EJ. Enantioselective Intermolecular [2 + 2 + 2] Cycloadditions of Ene–Allenes with Allenoates. Org Lett 2012; 14:6096-9. [DOI: 10.1021/ol303024q] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrew T. Brusoe
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Rahul V. Edwankar
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Erik J. Alexanian
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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355
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Ogawa Y, Painter PP, Tantillo DJ, Wender PA. Mechanistic and computational studies of exocyclic stereocontrol in the synthesis of bryostatin-like cis-2,6-disubstituted 4-alkylidenetetrahydropyrans by Prins cyclization. J Org Chem 2012; 78:104-15. [PMID: 23121542 DOI: 10.1021/jo301953h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Prins cyclization of syn-β-hydroxy allylsilanes and aldehydes gives cis-2,6-disubstituted 4-alkylidenetetrahydropyrans as sole products in excellent yields regardless of the aldehyde (R″) or syn-β-hydroxy allylsilane substituent (R') used. By reversing the R″ and R' groups, complementary exocyclic stereocontrol can be achieved. When the anti-β-hydroxy allylsilanes are used, the Prins cyclization gives predominantly cis-2,6-disubstituted 4-alkylidenetetrahydropyrans, now with the opposite olefin geometry in excellent yield. The proposed reaction mechanism and the observed stereoselectivity for these processes are supported by DFT calculations.
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Affiliation(s)
- Yasuyuki Ogawa
- Department of Chemistry, University of California, Davis, California 95616, United States
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356
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Nakamura H, Hamer HA, Sirasani G, Balskus EP. Cylindrocyclophane biosynthesis involves functionalization of an unactivated carbon center. J Am Chem Soc 2012; 134:18518-21. [PMID: 23106426 DOI: 10.1021/ja308318p] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The cylindrocyclophanes are a family of natural products that share a remarkable paracyclophane carbon scaffold. Using genome sequencing and bioinformatic analyses, we have discovered a biosynthetic gene cluster involved in the assembly of cylindrocyclophane F. Through a combination of in vitro enzyme characterization and feeding studies, we confirm the connection between this gene cluster and cylindrocyclophane production, elucidate the chemical events involved in initiating and terminating an unusual type I polyketide synthase assembly line, and discover that macrocycle assembly involves functionalization of an unactivated carbon center.
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Affiliation(s)
- Hitomi Nakamura
- Department of Chemistry & Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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357
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Minko Y, Pasco M, Lercher L, Botoshansky M, Marek I. Forming all-carbon quaternary stereogenic centres in acyclic systems from alkynes. Nature 2012; 490:522-6. [DOI: 10.1038/nature11569] [Citation(s) in RCA: 162] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2012] [Accepted: 09/06/2012] [Indexed: 12/24/2022]
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358
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Gabriele B, Mancuso R, Salerno G. Oxidative Carbonylation as a Powerful Tool for the Direct Synthesis of Carbonylated Heterocycles. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200794] [Citation(s) in RCA: 244] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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359
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Hu J, Tian B, Wu X, Tong X. Tertiary Amine-Triggered Cascade SN2/Cycloaddition: An Efficient Construction of Complex Azaheterocycles under Mild Conditions. Org Lett 2012; 14:5074-7. [DOI: 10.1021/ol302329b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jian Hu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, P.R. China
| | - Bing Tian
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, P.R. China
| | - Xinyan Wu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, P.R. China
| | - Xiaofeng Tong
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, P.R. China
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360
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Lin L, Yamamoto K, Matsunaga S, Kanai M. Rhodium-Catalyzed Cross-Aldol Reaction: In Situ Aldehyde-Enolate Formation from Allyloxyboranes and Primary Allylic Alcohols. Angew Chem Int Ed Engl 2012; 51:10275-9. [DOI: 10.1002/anie.201205680] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Indexed: 11/08/2022]
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361
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Lin L, Yamamoto K, Matsunaga S, Kanai M. Rhodium-Catalyzed Cross-Aldol Reaction: In Situ Aldehyde-Enolate Formation from Allyloxyboranes and Primary Allylic Alcohols. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205680] [Citation(s) in RCA: 16] [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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362
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Kocsis LS, Benedetti E, Brummond KM. A thermal dehydrogenative Diels-Alder reaction of styrenes for the concise synthesis of functionalized naphthalenes. Org Lett 2012; 14:4430-3. [PMID: 22913473 DOI: 10.1021/ol301938z] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Functionalized naphthalenes are valuable building blocks in many important areas. A microwave-assisted, intramolecular dehydrogenative Diels-Alder reaction of styrenyl derivatives to provide cyclopenta[b]naphthalene substructures not previously accessible using existing synthetic methods is described. The synthetic utility of these uniquely functionalized naphthalenes was demonstrated by a single-step conversion of one of these cycloadducts to a fluorophore bearing a structural resemblance to Prodan.
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Affiliation(s)
- Laura S Kocsis
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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363
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364
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Kalaitzakis D, Montagnon T, Alexopoulou I, Vassilikogiannakis G. A Versatile Synthesis of Meyers’ Bicyclic Lactams from Furans: Singlet-Oxygen-Initiated Reaction Cascade. Angew Chem Int Ed Engl 2012; 51:8868-71. [DOI: 10.1002/anie.201204419] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Indexed: 11/11/2022]
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365
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Kalaitzakis D, Montagnon T, Alexopoulou I, Vassilikogiannakis G. A Versatile Synthesis of Meyers’ Bicyclic Lactams from Furans: Singlet-Oxygen-Initiated Reaction Cascade. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204419] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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366
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Kotha S, Waghule GT. Diversity oriented approach to crownophanes by enyne metathesis and Diels-Alder reaction as key steps. J Org Chem 2012; 77:6314-8. [PMID: 22731677 DOI: 10.1021/jo300766f] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Various crownophanes are assembled starting with simple phenol derivatives such as catechol, resorcinol, and hydroquinone. Here, cross-enyne metathesis (CEM) and Diels-Alder (DA) reaction have been used as key steps. This strategy has embedded six diversity points.
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, India.
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367
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Affiliation(s)
- Dimitris Noutsias
- Department of Chemistry, University of Crete, Vasilika Vouton, 71003 Iraklion, Crete, Greece
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368
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Hou Y, Braun DR, Michel CR, Klassen J, Adnani N, Wyche TP, Bugni TS. Microbial strain prioritization using metabolomics tools for the discovery of natural products. Anal Chem 2012; 84:4277-83. [PMID: 22519562 PMCID: PMC3352271 DOI: 10.1021/ac202623g] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 04/22/2012] [Indexed: 12/16/2022]
Abstract
Natural products profoundly impact many research areas, including medicine, organic chemistry, and cell biology. However, discovery of new natural products suffers from a lack of high throughput analytical techniques capable of identifying structural novelty in the face of a high degree of chemical redundancy. Methods to select bacterial strains for drug discovery have historically been based on phenotypic qualities or genetic differences and have not been based on laboratory production of secondary metabolites. Therefore, untargeted LC/MS-based secondary metabolomics was evaluated to rapidly and efficiently analyze marine-derived bacterial natural products using LC/MS-principal component analysis (PCA). A major goal of this work was to demonstrate that LC/MS-PCA was effective for strain prioritization in a drug discovery program. As proof of concept, we evaluated LC/MS-PCA for strain selection to support drug discovery, for the discovery of unique natural products, and for rapid assessment of regulation of natural product production.
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Affiliation(s)
- Yanpeng Hou
- Pharmaceutical Sciences Division,
School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Doug R. Braun
- Pharmaceutical Sciences Division,
School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Cole R. Michel
- Pharmaceutical Sciences Division,
School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Jonathan
L. Klassen
- Department of Bacteriology, University of Wisconsin,
Madison, Wisconsin 53705,
United States
| | - Navid Adnani
- Pharmaceutical Sciences Division,
School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Thomas P. Wyche
- Pharmaceutical Sciences Division,
School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53705, United States
| | - Tim S. Bugni
- Pharmaceutical Sciences Division,
School of Pharmacy, University of Wisconsin, Madison, Wisconsin 53705, United States
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369
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Ivanova B, Spiteller M. Coordination ability of silver(I) with antimycins and actinomycins – Properties of the T-shaped chromophores. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.03.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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370
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Ivanova B, Spiteller M. On the Biosynthetic Pathway of Papaverine via (S)-Reticuline – Theoretical vs. Experimental Study. Nat Prod Commun 2012. [DOI: 10.1177/1934578x1200700508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The electronic structures, optical properties and molecular structures of a series of isoquinoline alkaloids resulting in the formation of papaverine, through a proposed biosynthetic pathway via S(+)-reticuline were elucidated. The mechanism of papaverine synthesis was studied by electronic absorption, diffuse reflectance, fluorescence and CD spectroscopy, as well as ESI and MALDI Orbitrap imaging mass spectrometry. Quantum chemical DFT calculations in the gas phase and solution were performed with a view to study the electronic transitions of the interacting species, corresponding proposed intermediates, and the expected mass spectrometric fragments. The complete study and understanding of the mechanism of the biosynthetic pathway in the poppy plants appears important for the functional oriented drug-design and synthesis of corresponding structurally related alkaloids.
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Affiliation(s)
- Bojidarka Ivanova
- Institut für Umweltforschung, Universität Dortmund, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
| | - Michael Spiteller
- Institut für Umweltforschung, Universität Dortmund, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
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371
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Tanaka K, Mazumder K, Siwu ER, Nozaki S, Watanabe Y, Fukase K. Auxiliary-directed oxidation of ursolic acid by ‘Ru’-porphyrins: chemical modulation of cytotoxicity against tumor cell lines. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.01.107] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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372
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Charpenay M, Boudhar A, Blond G, Suffert J. An Expeditious and Atom-Economical Synthesis of a New Generation of Substituted [4.6.4.6]Fenestradienes. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107934] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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373
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Charpenay M, Boudhar A, Blond G, Suffert J. An Expeditious and Atom-Economical Synthesis of a New Generation of Substituted [4.6.4.6]Fenestradienes. Angew Chem Int Ed Engl 2012; 51:4379-82. [DOI: 10.1002/anie.201107934] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Indexed: 11/08/2022]
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374
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Schmitt DC, Malow EJ, Johnson JS. Three-component glycolate Michael reactions of enolates, silyl glyoxylates, and α,β-enones. J Org Chem 2012; 77:3246-51. [PMID: 22394389 DOI: 10.1021/jo202679u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Silyl glyoxylates react with enolates and enones to afford either glycolate aldol or Michael adducts. Product identity is controlled by the countercation associated with the enolate. Reformatsky nucleophiles in the presence of additional Zn(OTf)(2) result in aldol coupling (A), while lithium enolates provide the Michael coupling (B). Deprotonation of the aldol product A with LDA induces equilibration to form the minor diastereomer of Michael product B. This observation suggests that formation of the major diastereomer of Michael product B does not occur via an aldol/retro-aldol/Michael sequence.
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Affiliation(s)
- Daniel C Schmitt
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA
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375
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Garcia P, Evanno Y, George P, Sevrin M, Ricci G, Malacria M, Aubert C, Gandon V. Synthesis of Aminopyridines and Aminopyridones by Cobalt-Catalyzed [2+2+2] Cycloadditions Involving Yne-Ynamides: Scope, Limitations, and Mechanistic Insights. Chemistry 2012; 18:4337-44. [DOI: 10.1002/chem.201103906] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Indexed: 11/08/2022]
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376
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Abstract
Trigonoliimine B, a hexacyclic alkaloid, is synthesized in seven steps from simple starting materials. The synthesis features the use of an α-isocyanoacetate as a glycine template for the preparation of an α,α-disubstituted α-amino ester that is appropriately functionalized for the construction of C, D, and E rings. Sulfolane was found to be the solvent of choice for the unprecedented Bischler-Napieralski reaction implemented for the construction of a seven-membered ring with concurrent formation of an exo-imine function.
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Affiliation(s)
- Thomas Buyck
- Institut of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
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377
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Brady PB, Yamamoto H. Rapid and stereochemically flexible synthesis of polypropionates: super-silyl-governed aldol cascades. Angew Chem Int Ed Engl 2012; 51:1942-6. [PMID: 22252969 PMCID: PMC3480201 DOI: 10.1002/anie.201108325] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2011] [Indexed: 11/06/2022]
Affiliation(s)
- Patrick B. Brady
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, IL 60637 (USA)
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378
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Popescu AR, Musteti AD, Ferrer-Ugalde A, Viñas C, Núñez R, Teixidor F. Influential Role of Ethereal Solvent on Organolithium Compounds: The Case of Carboranyllithium. Chemistry 2012; 18:3174-84. [DOI: 10.1002/chem.201102626] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Indexed: 01/27/2023]
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379
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Ivanova B, Spiteller M. Physical Properties and Molecular Conformations of Indole Alkaloids and Model Protein Interactions – Theoretical vs. Experimental Study. Nat Prod Commun 2012. [DOI: 10.1177/1934578x1200700206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The physical properties and molecular structure of five natural indole alkaloids (IAs) and their interaction with protein targets have been studied, experimentally and theoretically. Electronic absorption (EAs) and CD spectroscopy, electrospray ionization (ESI) and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS), as well as imaging mass spectrometric techniques (IMS) were used, analyzing the isolated alkaloids and corresponding IAs/protein molecular complexes. Theoretical quantum chemical DFT calculations were also applied. The mechanism of their biological activity and structure-activity relationship as potential neurologically active compounds were studied, using the model interactions with 5HT2A receptors. The gas-phase stable molecular fragments of the IAs are discussed comparing the experimental mass spectrometric data and theoretical quantum chemical DFT calculations of the different molecular fragments of the IAs.
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Affiliation(s)
- Bojidarka Ivanova
- Institut für Umweltforschung (INFU) der Fakultät Chemie, Lehrstuhl für Umweltchemie und Analytische Chemie, Technische Universität Dortmund (TU Dortmund), Otto-Hahn-Straße 6, D-44221 Dortmund, Germany
| | - Michael Spiteller
- Institut für Umweltforschung (INFU) der Fakultät Chemie, Lehrstuhl für Umweltchemie und Analytische Chemie, Technische Universität Dortmund (TU Dortmund), Otto-Hahn-Straße 6, D-44221 Dortmund, Germany
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380
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Wender PA, Lesser AB, Sirois LE. Rhodium dinaphthocyclooctatetraene complexes: synthesis, characterization and catalytic activity in [5+2] cycloadditions. Angew Chem Int Ed Engl 2012; 51:2736-40. [PMID: 22298411 DOI: 10.1002/anie.201108270] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Revised: 12/27/2011] [Indexed: 12/12/2022]
Abstract
Rh COT in the act: a Ni(0)-catalyzed [2+2+2+2] cycloaddition provides a high-yielding, scalable synthesis of the ligand dinaphtho[a,e]cyclooctatetraene (dnCOT). dnCOT complexation with Rh(I) gives [Rh(dnCOT)(MeCN)(2)]SbF(6), an excellent catalyst for [5+2] cycloadditions of vinylcyclopropanes and π-systems with impressive functional group compatibility.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, CA 94305-5080, USA.
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381
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Wender PA, Lesser AB, Sirois LE. Rhodium Dinaphthocyclooctatetraene Complexes: Synthesis, Characterization and Catalytic Activity in [5+2] Cycloadditions. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108270] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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382
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Tan F, Xiao C, Cheng HG, Wu W, Ding KR, Xiao WJ. Enantioselective [4+2] Cycloadditions of 2-Vinyl-1 H-indoles with 3-Nitro-2 H-chromenes Catalyzed by a Zn(OTf)2/Bis(oxazoline) Complex: An Efficient Approach to Fused Heterocycles with a Quaternary Stereocenter. Chem Asian J 2012; 7:493-7. [DOI: 10.1002/asia.201100820] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Indexed: 11/09/2022]
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383
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Gigant N, Claveau E, Bouyssou P, Gillaizeau I. Diversity-oriented synthesis of polycyclic diazinic scaffolds. Org Lett 2012; 14:844-7. [PMID: 22260530 DOI: 10.1021/ol203364b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An efficient and versatile synthesis of a polycyclic diazinic system starting from oxazine has been developed using a two-step Michael/retro Michael and cyclization sequence. The substrates were synthesized with good to high yields giving rapid access to molecular diversity.
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Affiliation(s)
- Nicolas Gigant
- Institut de Chimie Organique et Analytique, UMR 7311 CNRS, rue de Chartres, Université d'Orléans, F-45067 Orléans Cedex 2, France
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384
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Brady PB, Yamamoto H. Rapid and Stereochemically Flexible Synthesis of Polypropionates: Super-Silyl-Governed Aldol Cascades. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108325] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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385
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Mehta G, Samineni R, Srihari P, Reddy RG, Chakravarty S. Diverted organic synthesis (DOS): accessing a new, natural product inspired, neurotrophically active scaffold through an intramolecular Pauson–Khand reaction. Org Biomol Chem 2012; 10:6830-3. [DOI: 10.1039/c2ob26107c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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386
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Gulder T, Baran PS. Strained cyclophane natural products: Macrocyclization at its limits. Nat Prod Rep 2012; 29:899-934. [DOI: 10.1039/c2np20034a] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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387
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Olimpieri F, Bellucci MC, Marcelli T, Volonterio A. Regioselective multicomponent sequential synthesis of hydantoins. Org Biomol Chem 2012; 10:9538-55. [DOI: 10.1039/c2ob26498f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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388
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389
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Xu J, Caro-Diaz EJ, Lacoske MH, Hung CI, Jamora C, Theodorakis EA. Fusarisetin A: Scalable Total Synthesis and Related Studies. Chem Sci 2012; 3:3378-3386. [PMID: 23227303 PMCID: PMC3513937 DOI: 10.1039/c2sc21308g] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Fusarisetin A (1) is a recently isolated natural product that displays an unprecedented chemical motif and remarkable bioactivities as a potent cancer migration inhibitor. We describe here our studies leading to an efficient and scalable total synthesis of 1. Essential to the strategy was the development of a new route for the formation of a trans-decalin moiety of this compound and the application of an oxidative radical cyclization (ORC) reaction that produces fusarisetin A (1) from equisetin (2) via a bio-inspired process. TEMPO-induced and metal/O(2)-promoted ORC reactions were evaluated. Biological screening in vitro confirms the reported potency of (+)-1. Importantly, ex vivo studies show that this compound is able to inhibit different types of cell migration. Moreover, the C(5) epimer of (+)-1 was also identified as a potent cancer migration inhibitor, while (-)-1 and 2 were found to be significantly less potent. The optimized synthesis is applicable on gram scale and provides a solid platform for analogue synthesis and methodical biological study.
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Affiliation(s)
- Jing Xu
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
| | - Eduardo J.E. Caro-Diaz
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
| | - Michelle H. Lacoske
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
| | - Chao-I. Hung
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
| | - Colin Jamora
- Section of Cell and Developmental Biology and Department of Medicine, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0752, USA
| | - Emmanuel A. Theodorakis
- Department of Chemistry & Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
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390
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Ivanova B, Spiteller M. Structure and properties of camptothecin derivatives, their protonated forms, and model interaction with the topoisomerase I-DNA complex. Biopolymers 2011; 97:134-44. [DOI: 10.1002/bip.21714] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Revised: 08/22/2011] [Accepted: 08/24/2011] [Indexed: 11/05/2022]
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391
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Cardenas-Daw C, Kroeger A, Schaertl W, Froimowicz P, Landfester K. Reversible Photocycloadditions, a Powerful Tool for Tailoring (Nano)Materials. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201100399] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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392
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Ivanova B, Spiteller M. Conformation, optical properties, and absolute configuration of 2′,3′-isopropylideneadenosines: Theoretical vs. experimental study. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.08.027] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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393
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Breder A, Chinigo GM, Waltman AW, Carreira EM. Towards the Synthesis of Massadine: A Unified Strategy for the Stereoselective Synthesis of the Carbocyclic C,D-Ring Subunit. Chemistry 2011; 17:12405-16. [DOI: 10.1002/chem.201101862] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Indexed: 11/07/2022]
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394
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Pellicena M, Krämer K, Romea P, Urpí F. Total synthesis of (+)-herboxidiene from two chiral lactate-derived ketones. Org Lett 2011; 13:5350-3. [PMID: 21913648 DOI: 10.1021/ol202210k] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A substrate-controlled synthesis of (+)-herboxidiene from two lactate-derived chiral ketones is described. Remarkably, most of the carbon backbone was constructed through highly stereoselective titanium-mediated aldol reactions and an Ireland-Claisen rearrangement. Furthermore, an oxa-Michael cyclization and a high-yield Suzuki coupling were used to assemble the pyran ring and the diene moiety respectively.
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Affiliation(s)
- Miquel Pellicena
- Departament de Química Orgànica, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
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395
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Wang Y, Luo YC, Hu XQ, Xu PF. A Powerful Cascade Approach for Expeditious Synthesis of Trifluoromethylated Furans. Org Lett 2011; 13:5346-9. [DOI: 10.1021/ol2022092] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yao Wang
- State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yong-Chun Luo
- State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xiu-Qin Hu
- State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Peng-Fei Xu
- State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
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396
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Hickmann V, Kondoh A, Gabor B, Alcarazo M, Fürstner A. Catalysis-Based and Protecting-Group-Free Total Syntheses of the Marine Oxylipins Hybridalactone and the Ecklonialactones A, B, and C. J Am Chem Soc 2011; 133:13471-80. [DOI: 10.1021/ja204027a] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Volker Hickmann
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Azusa Kondoh
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Barbara Gabor
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Manuel Alcarazo
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany
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397
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Esteve J, Jiménez C, Nebot J, Velasco J, Romea P, Urpí F. Highly stereoselective titanium-mediated aldol reactions from chiral α-silyloxy ketones. A reliable tool for the synthesis of natural products. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.06.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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398
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A survey of marine natural compounds and their derivatives with anti-cancer activity reported in 2010. Molecules 2011; 16:5629-46. [PMID: 21993222 PMCID: PMC6264395 DOI: 10.3390/molecules16075629] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 05/31/2011] [Accepted: 05/31/2011] [Indexed: 12/12/2022] Open
Abstract
Although considerable progress in oncology therapeutics has been achieved in the last century, cancer remains one of major death causes in the World and for this reason, the development of novel cancer drugs remains a pressing need. Natural marine compounds represent an interesting source of novel leads with potent chemotherapeutic or chemo-preventive activities. In the last decades, structure-activity-relationship studies have led to the development of naturally-derived or semi-synthetic analogues with improved bioactivity, a simplified synthetic target or less toxicity. We aim here to review a selection of natural compounds with reported anticancer activity isolated of marine sources and their associated analogues published in 2010.
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399
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Wender PA, Buschmann N, Cardin NB, Jones LR, Kan C, Kee JM, Kowalski JA, Longcore KE. Gateway synthesis of daphnane congeners and their protein kinase C affinities and cell-growth activities. Nat Chem 2011; 3:615-9. [PMID: 21778981 PMCID: PMC3144521 DOI: 10.1038/nchem.1074] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 05/18/2011] [Indexed: 11/09/2022]
Abstract
The daphnane diterpene orthoesters constitute a structurally fascinating family of natural products that exhibit a remarkable range of potent biological activities. Although partial activity information is available for some natural daphnanes, little information exists for non-natural congeners or on how changes in structure affect mode of action, function, potency or selectivity. A gateway strategy designed to provide general synthetic access to natural and non-natural daphnanes is described and utilized in the synthesis of two novel members of this class. In this study, a commercially available tartrate derivative was elaborated through a key late-stage diversification intermediate into B-ring yuanhuapin analogues to initiate exploration of the structure-function relationships of this class. Protein kinase C was identified as a cellular target for these agents, and their activity against human lung and leukaemia cell lines was evaluated. The natural product and a novel non-natural analogue exhibited significant potency, but the epimeric epoxide was essentially inactive.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, Stanford, California 94305, USA.
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400
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Cakmak M, Mayer P, Trauner D. An efficient synthesis of loline alkaloids. Nat Chem 2011; 3:543-5. [DOI: 10.1038/nchem.1072] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Accepted: 05/17/2011] [Indexed: 11/09/2022]
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