1
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Laschat S, Deimling M, Zens A, Park N, Hess C, Klenk S, Dilruba Z, Baro A. Adventures and Detours in the Synthesis of Hydropentalenes. Synlett 2021. [DOI: 10.1055/s-0040-1707226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Functionalized hydropentalenes (i.e., bicyclo[3.3.0]octanones) constitute important building blocks for natural products and for ligands for asymmetric catalysis. The assembly and tailored functionalization of this convex roof-shaped scaffold is challenging and has motivated a variety of synthetic approaches including our own contributions, which will be presented in this account.1 Introduction2 Biosynthesis of Hydropentalenes3 Hydropentalenes through the Pauson–Khand Reaction4 Hydropentalenes through Transannular Oxidative Cyclization of Cycloocta-1,4-diene5 Functionalization of Bicyclo[3.3.0]octan-1,4-dione to Dodecahydrocyclopenta[a]indenes6 Functionalization of Bicyclo[3.3.0]octan-1,4-diones to Crown Ether Hybrids7 Functionalization of Bicyclo[3.3.0]octan-1,4-dione to Cylindramide8 Tandem Ring-Opening Metathesis/Ring-Closing Metathesis/Cross-Metathesis of Bicyclo[2.2.1]heptanes9 Functionalization of Bicyclo[3.3.0]octan-1,4-dione to Geodin A10 Hydropentalenes through Enantioselective Desymmetrization of Weiss Diketones11 Functionalization of Weiss Diketones by Carbonyl Ene Reactions12 Functionalization of the Weiss Diketone to Cylindramide and Geodin A Core Units13 Biological Properties of Bicyclo[3.3.0]octanes14 Hydropentalenes through Vinylcyclopropane Cyclopentene Rearrangement15 Functionalization of Bicyclo[3.3.0]octanes toward Chiral Dienes16 Miscellaneous Syntheses of Hydropentalenes17 Conclusion and Outlook
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Affiliation(s)
| | - Max Deimling
- Institut für Organische Chemie, Universität Stuttgart
| | - Anna Zens
- Institut für Organische Chemie, Universität Stuttgart
| | - Natja Park
- Institut für Organische Chemie, Universität Stuttgart
| | | | - Simon Klenk
- Institut für Organische Chemie, Universität Stuttgart
| | - Zarfishan Dilruba
- Institut für Organische Chemie, Universität Stuttgart
- Department of Chemistry, University of Leicester
| | - Angelika Baro
- Institut für Organische Chemie, Universität Stuttgart
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2
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Dascalu AE, Ghinet A, Billamboz M, Lipka E. Performance comparison of chlorinated chiral stationary phases in supercritical fluid chromatography for separation of selected pyrrolidone derivatives. J Pharm Anal 2019; 9:248-253. [PMID: 31452962 PMCID: PMC6702407 DOI: 10.1016/j.jpha.2019.03.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 01/23/2019] [Accepted: 03/04/2019] [Indexed: 11/12/2022] Open
Abstract
The effects of two chlorinated chiral stationary phases, namely, Lux Cellulose-2 and Lux i-Cellulose-5, flow-rate, percentage of co-solvent and chemical structures of the compounds on retention and resolution were studied within this article. In this work a backpressure of 150 bar, a temperature of 40 °C and 10% of methanol as co-solvent were chosen as operating conditions. The optimum flow-rate was 2 mL/min. The percentage of co-solvent was studied between 7.5% and 15%. We have observed that 15% of methanol gave the best results for most of the compounds. For all the derivatives, the Lux Cellulose-2 provided better resolutions going from 1.50 to 3.59 compared with Lux i-Cellulose-5.
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Affiliation(s)
- Anca-Elena Dascalu
- Univ. Lille, Inserm, U995 - LIRIC - Lille Inflammation Research International Center, F-59000 Lille, France.,Ecole des Hautes Etudes d'Ingénieur (HEI), Laboratoire de Pharmacochimie, 13 rue de Toul, F-59046 Lille, France.,UFR Pharmacie, Laboratoire de Chimie Analytique, BP 83, F-59006 Lille, France.,'Alexandru Ioan Cuza' University of Iasi, Faculty of Chemistry, Bd. Carol I nr. 11, 700506 Iasi, Romania
| | - Alina Ghinet
- Univ. Lille, Inserm, U995 - LIRIC - Lille Inflammation Research International Center, F-59000 Lille, France.,Ecole des Hautes Etudes d'Ingénieur (HEI), Laboratoire de Pharmacochimie, 13 rue de Toul, F-59046 Lille, France.,'Alexandru Ioan Cuza' University of Iasi, Faculty of Chemistry, Bd. Carol I nr. 11, 700506 Iasi, Romania
| | - Muriel Billamboz
- Univ. Lille, Inserm, U995 - LIRIC - Lille Inflammation Research International Center, F-59000 Lille, France.,Ecole des Hautes Etudes d'Ingénieur (HEI), Laboratoire de Pharmacochimie, 13 rue de Toul, F-59046 Lille, France
| | - Emmanuelle Lipka
- Univ. Lille, Inserm, U995 - LIRIC - Lille Inflammation Research International Center, F-59000 Lille, France.,UFR Pharmacie, Laboratoire de Chimie Analytique, BP 83, F-59006 Lille, France
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3
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Li GW, Liu H, Qiu F, Wang XJ, Lei XX. Residual Dipolar Couplings in Structure Determination of Natural Products. NATURAL PRODUCTS AND BIOPROSPECTING 2018; 8:279-295. [PMID: 29943349 PMCID: PMC6102172 DOI: 10.1007/s13659-018-0174-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 06/14/2018] [Indexed: 05/16/2023]
Abstract
The determination of natural products stereochemistry remains a formidable task. Residual dipolar couplings (RDCs) induced by anisotropic media are a powerful tool for determination of the stereochemistry of organic molecule in solution. This review will provide a short introduction on RDCs-based methodology for the structural elucidation of natural products. Special attention is given to the current availability of alignment media in organic solvents. The applications of RDCs for structural analysis of some examples of natural products were discussed and summarized. This review provides a short introduction on RDCs-based methodology for the structural elucidation of natural products. Special attention is given to the current availability of alignment media in organic solvents. The applications of RDCs for structural analysis of some examples of natural products were discussed and summarized.
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Affiliation(s)
- Gao-Wei Li
- College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu, 476000, People's Republic of China
| | - Han Liu
- School of Pharmaceutical Sciences, South Central University for Nationalities, Wuhan, 430074, People's Republic of China
| | - Feng Qiu
- School of Pharmaceutical Sciences, South Central University for Nationalities, Wuhan, 430074, People's Republic of China
| | - Xiao-Juan Wang
- College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu, 476000, People's Republic of China
| | - Xin-Xiang Lei
- School of Pharmaceutical Sciences, South Central University for Nationalities, Wuhan, 430074, People's Republic of China.
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4
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Reller M, Wesp S, Koos MRM, Reggelin M, Luy B. Biphasic Liquid Crystal and the Simultaneous Measurement of Isotropic and Anisotropic Parameters by Spatially Resolved NMR Spectroscopy. Chemistry 2017. [DOI: 10.1002/chem.201702126] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Malin Reller
- Institut für Organische Chemie and Institut für Biologische Grenzflächen 4 - Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Svenja Wesp
- Organische Chemie; Technische Universität Darmstadt; Alarich-Weiss Str. 4 64287 Darmstadt Germany
| | - Martin R. M. Koos
- Institut für Organische Chemie and Institut für Biologische Grenzflächen 4 - Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Michael Reggelin
- Organische Chemie; Technische Universität Darmstadt; Alarich-Weiss Str. 4 64287 Darmstadt Germany
| | - Burkhard Luy
- Institut für Organische Chemie and Institut für Biologische Grenzflächen 4 - Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
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5
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Marcó N, Souza AA, Nolis P, Gil RR, Parella T. Perfect 1J CH-resolved HSQC: Efficient measurement of one-bond proton-carbon coupling constants along the indirect dimension. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2017; 276:37-42. [PMID: 28092787 DOI: 10.1016/j.jmr.2017.01.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 12/30/2016] [Accepted: 01/01/2017] [Indexed: 06/06/2023]
Abstract
A versatile 1JCH-resolved HSQC pulse scheme for the speedy, accurate and automated determination of one-bond proton-carbon coupling constants is reported. The implementation of a perfectBIRD element allows a straightforward measurement from the clean doublets obtained along the highly resolved F1 dimension, even for each individual 1JCHa and 1JCHb in diastereotopic HaCHb methylene groups. Real-time homodecoupling during acquisition and other alternatives to minimize accidental signal overlapping in overcrowded spectra are also discussed.
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Affiliation(s)
- N Marcó
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain
| | - A A Souza
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain; Departamento de Química, Universidade Federal do Piauí, 64049-550 Teresina, PI, Brazil
| | - P Nolis
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain
| | - R R Gil
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, USA
| | - T Parella
- Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Catalonia, Spain.
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6
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Tzvetkova P, Luy B. Q.E.COSY: determining sign and size of small deuterium residual quadrupolar couplings using an extended E.COSY principle. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:351-357. [PMID: 26763050 DOI: 10.1002/mrc.4386] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 09/30/2015] [Accepted: 10/23/2015] [Indexed: 06/05/2023]
Abstract
Residual quadrupolar couplings contain important structural information comparable with residual dipolar couplings. However, the measurement of sign and size of especially small residual quadrupolar couplings is difficult. Here, we present an extension of the E.COSY principle to spin systems consisting of a Spin 1 coupled to a spin ½ nucleus, which allows the determination of the sign of the quadrupolar coupling of the Spin 1 nucleus relative to the heteronuclear coupling between the spins. The so-called Q.E.COSY approach is demonstrated with its sign-sensitivity using variable angle NMR, stretched gels and liquid crystalline phases applied to various CD and CD3 groups. Especially the sign-sensitive measurement of residual quadrupolar couplings that remain unresolved in conventional deuterium 1D spectra is shown.
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Affiliation(s)
- Pavleta Tzvetkova
- Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance, Fritz-Haber-Weg 6, 76131, Karlsruhe, Germany
| | - Burkhard Luy
- Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance, Fritz-Haber-Weg 6, 76131, Karlsruhe, Germany
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7
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Zaghouani M, Nay B. 3-Acylated tetramic and tetronic acids as natural metal binders: myth or reality? Nat Prod Rep 2016; 33:540-8. [PMID: 26879987 DOI: 10.1039/c5np00144g] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Covering: up to 20153-Acylated tetramic and tetronic acids are characterized by a low pKa and are likely to be deprotonated under physiological conditions. In addition, their structure makes them excellent chelators of metallic cations. We will discuss the significance of these chemical properties with regard to the biological properties and mechanisms of action of these compounds, highlighting the importance of considering them as salts or chelates for biological purposes, rather than acids.
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Affiliation(s)
- Mehdi Zaghouani
- Muséum National d'Histoire Naturelle, CNRS, UMR 7245 Molécules de Communication et Adaptation des Micro-organismes, 57 rue Cuvier (CP 54), 75005 Paris, France.
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8
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Loke I, Bentzinger G, Holz J, Raja A, Bhasin A, Sasse F, Köhn A, Schobert R, Laschat S. Synthesis of the AB ring system of clifednamide utilizing Claisen rearrangement and Diels–Alder reaction as key steps. Org Biomol Chem 2016; 14:884-94. [DOI: 10.1039/c5ob01491c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A synthesis to the functionalized AB ring system of clifednamide, member of macrocyclic tetramic acid lactams, was developed involving an Ireland–Claisen rearrangement and an intramolecular Diels–Alder reaction.
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Affiliation(s)
- Inga Loke
- Institut für Organische Chemie
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
| | | | - Julia Holz
- Institut für Organische Chemie
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
| | - Aruna Raja
- Abteilung Chemische Biologie
- Helmholtz-Zentrum für Infektionsforschung
- D-38124 Braunschweig
- Germany
| | - Aman Bhasin
- Abteilung Chemische Biologie
- Helmholtz-Zentrum für Infektionsforschung
- D-38124 Braunschweig
- Germany
| | - Florenz Sasse
- Abteilung Chemische Biologie
- Helmholtz-Zentrum für Infektionsforschung
- D-38124 Braunschweig
- Germany
| | - Andreas Köhn
- Institut für Theoretische Chemie
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
| | - Rainer Schobert
- Lehrstuhl für Organische Chemie
- Universität Bayreuth
- D-95447 Bayreuth
- Germany
| | - Sabine Laschat
- Institut für Organische Chemie
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
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9
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Lutz V, Mannchen F, Krebs M, Park N, Krüger C, Raja A, Sasse F, Baro A, Laschat S. SAR studies on hydropentalene derivatives--Important core units of biologically active tetramic acid macrolactams and ptychanolides. Bioorg Med Chem 2014; 22:3252-61. [PMID: 24856181 DOI: 10.1016/j.bmc.2014.04.063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 04/28/2014] [Accepted: 04/29/2014] [Indexed: 10/25/2022]
Abstract
Structurally diverse bicyclo[3.3.0]octanes were prepared and tested for their biological activity. Both the antiproliferative activity and the results of phenotypic characterization varied with the substitution patterns. Two derivatives displayed high inhibitory (IC50 ≤3μM) activity against the L-929 cell line, but differed in their mode of action. A cluster analysis with impedance profiling data showed the two compounds in relationship to microtubule interfering compounds. In PtK2 cells treated with both derivatives a perturbing effect on the microtubular network was observed, whereas the actin cytoskeleton in incubated PtK2 cells was disturbed only by one compound. The effects on tubulin and actin polymerization could be confirmed by in vitro polymerization experiments.
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Affiliation(s)
- Vanessa Lutz
- Institut für Organische Chemie der Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Fabian Mannchen
- Institut für Organische Chemie der Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Michael Krebs
- Institut für Organische Chemie der Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Natja Park
- Institut für Organische Chemie der Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Claudia Krüger
- Institut für Organische Chemie der Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Aruna Raja
- Department of Chemical Biology, Helmholtz Centre for Infection Research, Inhoffenstr. 7, 38124 Braunschweig, Germany
| | - Florenz Sasse
- Department of Chemical Biology, Helmholtz Centre for Infection Research, Inhoffenstr. 7, 38124 Braunschweig, Germany.
| | - Angelika Baro
- Institut für Organische Chemie der Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Sabine Laschat
- Institut für Organische Chemie der Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
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10
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Mo X, Li Q, Ju J. Naturally occurring tetramic acid products: isolation, structure elucidation and biological activity. RSC Adv 2014. [DOI: 10.1039/c4ra09047k] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Natural products containing the tetramic acid core scaffold have been isolated from an assortment of terrestrial and marine species and often display wide ranging and potent biological activities including antibacterial, antiviral and antitumoral activities.
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Affiliation(s)
- Xuhua Mo
- Shandong Key Laboratory of Applied Mycology
- School of Life Sciences
- Qingdao Agricultural University
- Qingdao, China
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology
| | - Qinglian Li
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology
- Guangdong Key Laboratory of Marine Materia Medica
- RNAM Center for Marine Microbiology
- South China Sea Institute of Oceanology
- Chinese Academy of Sciences
| | - Jianhua Ju
- CAS Key Laboratory of Tropical Marine Bio-resources and Ecology
- Guangdong Key Laboratory of Marine Materia Medica
- RNAM Center for Marine Microbiology
- South China Sea Institute of Oceanology
- Chinese Academy of Sciences
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11
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Tzvetkova P, Luy B, Simova S. Configuration verification via RDCs on the example of a tetra-substituted pyrrolidine ring. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2012; 50 Suppl 1:S92-S101. [PMID: 23280666 DOI: 10.1002/mrc.3902] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Revised: 10/12/2012] [Accepted: 10/22/2012] [Indexed: 06/01/2023]
Abstract
The configurational analysis of organic compounds is an important application for high resolution NMR spectroscopy. In the present study, a tetra-substituted pyrrolidine with four chiral carbon atoms is analyzed using classical methods based on (3) J and NOE data in solution and compared and verified with recently introduced alternative approaches via residual dipolar couplings (RDCs) in two weak anisotropic alignment media. The molecule shows sufficient rigidity in the five-membered ring for the configurational characterization with the various techniques. However, the flexibility caused by the many freely rotating bonds potentially poses problems for the interpretation of data. It is shown that RDCs measured in poly-γ-benzyl-l-glutamate and a stretched polydimethylsiloxane gel provide useful information for the distinction of diastereomers, but the success varies with the data interpretation strategy used. Although a general improvement of corresponding correlation factors is observed when limiting data to a subset of dipolar couplings directly connected to the central ring, the distinction power is reduced because of the smaller number of RDCs available for potential model falsification. Singular value decomposition for fitting experimental RDCs is able to distinguish in most cases the correct from incorrect configurations, but the differences in correlation factors can be relatively small. Surprisingly, predicting RDCs using the rod model as implemented in PALES gives best results in distinguishing the eight possible diastereomers. It is also found that the use of proton-phosphorus and carbon-phosphorus RDCs helps with the configurational analysis of the model compound.
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Affiliation(s)
- Pavleta Tzvetkova
- Institute of Organic Chemistry and Institute for Biological Surfaces, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
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12
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Sengoku T, Nagae Y, Ujihara Y, Takahashi M, Yoda H. A synthetic approach to diverse 3-acyltetramic acids via O- to C-acyl rearrangement and application to the total synthesis of penicillenol series. J Org Chem 2012; 77:4391-401. [PMID: 22510093 DOI: 10.1021/jo300527f] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For the efficient approach to medicinally important α-branched 3-acyltetramic acids, the key reaction of O- to C- acyl rearrangement using α-amino-acid-derived 4-O-acyltetramic acids was extensively examined in the presence of various metal salts. Use of CaCl(2) or NaI dramatically changed the results in the reaction efficiency and rapidly brought about the desired α-branched 3-acyltetramic acids in markedly improved yields. We also discuss an epimerization at C5 stereocenter under the rearrangement conditions as well as the tolerance for structural variation at C3 and C5. In addition to the preceding success in the total synthesis of new cytotoxic tetramic acid, penicillenol A(1), this methodology could be also applied to the first total synthesis of penicillenol A(2).
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Affiliation(s)
- Tetsuya Sengoku
- Department of Materials Science, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, Shizuoka 432-8561, Japan
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13
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Reboll MR, Ritter B, Sasse F, Niggemann J, Frank R, Nourbakhsh M. The myxobacterial compounds spirangien a and spirangien M522 are potent inhibitors of IL-8 expression. Chembiochem 2012; 13:409-15. [PMID: 22271561 DOI: 10.1002/cbic.201100635] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Indexed: 11/07/2022]
Abstract
Elevated expression of interleukin-8 (IL-8) has been implicated in inflammatory diseases, in tumor growth, and in angiogenesis. The aim of this study was to identify natural or synthetic compounds that suppress IL-8 production in response to interleukin-1 (IL-1), the natural inflammatory stimulus of the IL-8 gene. We therefore developed an IL-1-inducible cell-based screening assay by stable integration of an IL-8 reporter gene into HeLa S3 cells. The screening of heterogeneous compound libraries revealed several compounds that displayed an inhibitory effect on the reporter gene expression. Following hit validation, we focused on the most efficient compound, spirangien A, and its chemical derivate spirangien M522. Detailed analysis shows that both compounds are potent inhibitors of the endogenous IL-8 gene transcription. Furthermore, both compounds decelerate the phosphorylation and degradation of IκBα, the key regulator of the IL-1-stimulated NF-κB signaling pathway. Our study has identified the two spirangiens A and M522 as potent inhibitors of IL-1/NF-κB-mediated IL-8 gene expression.
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Affiliation(s)
- Marc René Reboll
- Department of Chemical Biology, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
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14
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Loke I, Park N, Kempf K, Jagusch C, Schobert R, Laschat S. Influence of steric parameters on the synthesis of tetramates from α-amino-β-alkoxy-esters and Ph3PCCO. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.10.099] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Ushakov DB, Navickas V, Ströbele M, Maichle-Mössmer C, Sasse F, Maier ME. Total Synthesis and Biological Evaluation of (−)-9-Deoxy-englerin A. Org Lett 2011; 13:2090-3. [DOI: 10.1021/ol200499t] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dmitry B. Ushakov
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen, Germany, Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, and Abteilung Chemische Biologie, Helmholtz-Zentrum für Infektionsforschung, Inhoffenstrasse 7, 38124 Braunschweig, Germany
| | - Vaidotas Navickas
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen, Germany, Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, and Abteilung Chemische Biologie, Helmholtz-Zentrum für Infektionsforschung, Inhoffenstrasse 7, 38124 Braunschweig, Germany
| | - Markus Ströbele
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen, Germany, Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, and Abteilung Chemische Biologie, Helmholtz-Zentrum für Infektionsforschung, Inhoffenstrasse 7, 38124 Braunschweig, Germany
| | - Cäcilia Maichle-Mössmer
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen, Germany, Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, and Abteilung Chemische Biologie, Helmholtz-Zentrum für Infektionsforschung, Inhoffenstrasse 7, 38124 Braunschweig, Germany
| | - Florenz Sasse
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen, Germany, Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, and Abteilung Chemische Biologie, Helmholtz-Zentrum für Infektionsforschung, Inhoffenstrasse 7, 38124 Braunschweig, Germany
| | - Martin E. Maier
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen, Germany, Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany, and Abteilung Chemische Biologie, Helmholtz-Zentrum für Infektionsforschung, Inhoffenstrasse 7, 38124 Braunschweig, Germany
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16
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Popescu R, Heiss EH, Ferk F, Peschel A, Knasmueller S, Dirsch VM, Krupitza G, Kopp B. Ikarugamycin induces DNA damage, intracellular calcium increase, p38 MAP kinase activation and apoptosis in HL-60 human promyelocytic leukemia cells. Mutat Res 2011; 709-710:60-6. [PMID: 21392513 DOI: 10.1016/j.mrfmmm.2011.03.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2010] [Revised: 02/28/2011] [Accepted: 03/02/2011] [Indexed: 12/13/2022]
Abstract
Ikarugamycin (IKA) is an antibiotic with strong antiprotozoal and cytotoxic activity. The purpose of our work was to provide insight into the mechanism of action characterizing the cytotoxic effect of IKA in HL-60 leukemia cells in order to evaluate its potential as an antineoplastic agent. Cell viability was reduced in response to IKA (IC(50) of 221.3nM), while the amount of HL-60 cells with a subdiploid DNA content increased significantly after 24h. Apoptotic cell death was confirmed by the cleavage of caspase-9, -8 and -3 using immunoblotting. Single cell gel electrophoresis pointed to an early genotoxic effect. Monitoring of intracellular calcium ([Ca(2+)](i)) levels by flow cytometric analysis of Fluo-3-AM fluorescence indicated an increase in cytosolic calcium that correlated with the cleavage of caspases. In addition, IKA triggered the activation of p38 MAP kinase which was partly dependent on elevated [Ca(2+)](i) concentrations and contributed to caspase activation. The data demonstrate that IKA induced apoptosis in HL-60 cells through genotoxicity and caspase activation which was in part correlated to an increase in intracellular calcium levels and activation of p38 MAP kinase.
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Affiliation(s)
- Ruxandra Popescu
- Department of Pharmacognosy, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
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17
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Kummerlöwe G, Grage SL, Thiele CM, Kuprov I, Ulrich AS, Luy B. Variable angle NMR spectroscopy and its application to the measurement of residual chemical shift anisotropy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2011; 209:19-30. [PMID: 21256060 DOI: 10.1016/j.jmr.2010.11.019] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Revised: 11/30/2010] [Accepted: 11/30/2010] [Indexed: 05/30/2023]
Abstract
The successful measurement of anisotropic NMR parameters like residual dipolar couplings (RDCs), residual quadrupolar couplings (RQCs), or residual chemical shift anisotropy (RCSA) involves the partial alignment of solute molecules in an alignment medium. To avoid any influence of the change of environment from the isotropic to the anisotropic sample, the measurement of both datasets with a single sample is highly desirable. Here, we introduce the scaling of alignment for mechanically stretched polymer gels by varying the angle of the director of alignment relative to the static magnetic field, which we call variable angle NMR spectroscopy (VA-NMR). The technique is closely related to variable angle sample spinning NMR spectroscopy (VASS-NMR) of liquid crystalline samples, but due to the mechanical fixation of the director of alignment no sample spinning is necessary. Also, in contrast to VASS-NMR, VA-NMR works for the full range of sample inclinations between 0° and 90°. Isotropic spectra are obtained at the magic angle. As a demonstration of the approach we measure ¹³C-RCSA values for strychnine in a stretched PDMS/CDCl₃ gel and show their usefulness for assignment purposes. In this context special care has been taken with respect to the exact calibration of chemical shift data, for which three approaches have been derived and tested.
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Affiliation(s)
- Grit Kummerlöwe
- Department Chemie, Lehrstuhl Organische Chemie II, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany
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18
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Abstract
The synthesis of 3-acyltetramic acids, the substructure of bioactive natural products, via O-acylation of tetramic acids with carboxylic acids followed by acyl migration, has been investigated. This acylation sequence is mediated by N,N'-dicyclohexylcarbodiimide (DCC) and 4-dimethylaminopyridine (DMAP) and is very sensitive to the nature of the nitrogen substituent (R(1)), the nature of the carboxylic acid (R(2)CO(2)H), and the amount of DMAP. Acylation of N-acyl tetramic acids with an alkyl carboxylic acid using 1.3 equiv of DMAP (with 1.1 equiv of DCC) unexpectedly gave the 3-acyltetramic acid directly as a result of acyl migration induced by excess amounts of DMAP. On the other hand, N-unsubstituted, N-alkyl, and N-acyl tetramic acids with alkyl and aromatic carboxylic acids gave the O-acyl tetramic acids by using only 0.1 equiv of DMAP (with 1.1 equiv of DCC); these could be further rearranged to the acyl product by treatment with excess DMAP. The tautomeric equilibrium of these 3-acyltetramic acids in solution was found to strongly depend on the nitrogen substituent group (R(1)) rather than the 3-acyl group.
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Affiliation(s)
- Yong-Chul Jeong
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Rd, Oxford OX1 3TA, UK
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19
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Rink C, Sasse F, Zubrienė A, Matulis D, Maier ME. Probing the Influence of an Allylic Methyl Group in Zearalenone Analogues on Binding to Hsp90. Chemistry 2010; 16:14469-78. [DOI: 10.1002/chem.201001752] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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20
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Kummerlöwe G, Behl M, Lendlein A, Luy B. Artifact-free measurement of residual dipolar couplings in DMSO by the use of cross-linked perdeuterated poly(acrylonitrile) as alignment medium. Chem Commun (Camb) 2010; 46:8273-5. [DOI: 10.1039/c0cc02730h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Effenberger K, Breyer S, Schobert R. Terpene Conjugates of theNigella sativaSeed-Oil Constituent Thymoquinone with Enhanced Efficacy in Cancer Cells. Chem Biodivers 2010; 7:129-39. [DOI: 10.1002/cbdv.200900328] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Ugele M, Sasse F, Knapp S, Fedorov O, Zubriene A, Matulis D, Maier ME. Propionate Analogues of Zearalenone Bind to Hsp90. Chembiochem 2009; 10:2203-12. [DOI: 10.1002/cbic.200900109] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Pachali S, Hofmann C, Rapp G, Schobert R, Baro A, Frey W, Laschat S. Stereoselective Synthesis of (2E,4Z)-Dienamides Employing (Triphenylphosphoranylidene)ketene. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900176] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kummerlöwe G, Luy B. Residual dipolar couplings as a tool in determining the structure of organic molecules. Trends Analyt Chem 2009. [DOI: 10.1016/j.trac.2008.11.016] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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