1
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Wei J, Tang Y, Yang Q, Li H, He D, Cai Y. Asymmetric Ketoalkylation/Rearrangement of Alkyenlfurans via Synergistic Photoredox/Brønsted Acid Catalysis. Org Lett 2022; 24:7928-7933. [PMID: 36269030 DOI: 10.1021/acs.orglett.2c03040] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An enantioselective three-component rearrangement of alkenylfurans with various cycloalkyl silyl peroxides and anilines has been developed by merging photoredox catalysis with chiral Brønsted acid catalysis. This protocol provides expedient access to a broad spectrum of ketoalkyl-functionalized 4-aminocyclopentenones in high yields with excellent enantio- and diastereoselectivities. Diverse functional groups can be introduced via facile product derivations.
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Affiliation(s)
- Jie Wei
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Yurong Tang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Qian Yang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Hongxiang Li
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Dongxian He
- Chongqing Medical and Pharmaceutical College, Chongqing 401331, China
| | - Yunfei Cai
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
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2
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Shaw P, Hassell-Hart SJ, Douglas GE, Malcolm AG, Kennedy AR, White GV, Paterson LC, Kerr WJ. Oxygenated Cyclopentenones via the Pauson-Khand Reaction of Silyl Enol Ether Substrates. Org Lett 2022; 24:2750-2755. [PMID: 35377671 PMCID: PMC9016766 DOI: 10.1021/acs.orglett.2c00856] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
![]()
We report here the
application of silyl enol ether moieties as
efficient alkene coupling partners within cobalt-mediated intramolecular
Pauson–Khand reactions. This cyclization strategy delivers
synthetically valuable oxygenated cyclopentenone products in yields
of ≤93% from both ketone- and aldehyde-derived silyl enol ethers,
incorporates both terminal and internal alkyne partners, and delivers
a variety of decorated systems, including more complex tricyclic structures.
Facile removal of the silyl protecting group reveals oxygenated sites
for potential further elaboration.
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Affiliation(s)
- Paul Shaw
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, U.K
| | - Storm J Hassell-Hart
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, U.K.,Medicines Research Centre, GlaxoSmithKline, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, England, U.K
| | - Gayle E Douglas
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, U.K
| | - Andrew G Malcolm
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, U.K
| | - Alan R Kennedy
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, U.K
| | - Gemma V White
- Medicines Research Centre, GlaxoSmithKline, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, England, U.K
| | - Laura C Paterson
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, U.K
| | - William J Kerr
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, U.K
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3
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Ditfe T, Bette E, N. Sultani H, Otto A, Wessjohann LA, Arnold N, Westermann B. Synthesis and Biological Evaluation of Highly Potent Fungicidal
Deoxy
‐Hygrophorones. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100729] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Toni Ditfe
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 06120 Halle (Saale) Germany
| | - Eileen Bette
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 06120 Halle (Saale) Germany
| | - Haider N. Sultani
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 06120 Halle (Saale) Germany
| | - Alexander Otto
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 06120 Halle (Saale) Germany
| | - Ludger A. Wessjohann
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 06120 Halle (Saale) Germany
- Institute of Organic Chemistry Faculty of Natural Sciences II Martin-Luther-University Halle-Wittenberg Kurt-Mothes-Str. 2 06120 Halle (Saale) Germany
| | - Norbert Arnold
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 06120 Halle (Saale) Germany
| | - Bernhard Westermann
- Department of Bioorganic Chemistry Leibniz-Institute of Plant Biochemistry Weinberg 3 06120 Halle (Saale) Germany
- Institute of Organic Chemistry Faculty of Natural Sciences II Martin-Luther-University Halle-Wittenberg Kurt-Mothes-Str. 2 06120 Halle (Saale) Germany
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4
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Ibáñez de Opakua A, Klama F, Ndukwe IE, Martin GE, Williamson RT, Zweckstetter M. Determination of Complex Small-Molecule Structures Using Molecular Alignment Simulation. Angew Chem Int Ed Engl 2020; 59:6172-6176. [PMID: 31971323 PMCID: PMC7187346 DOI: 10.1002/anie.202000311] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 01/23/2020] [Indexed: 11/12/2022]
Abstract
Correct structural assignment of small molecules and natural products is critical for drug discovery and organic chemistry. Anisotropy-based NMR spectroscopy is a powerful tool for the structural assignment of organic molecules, but it relies on the utilization of a medium that disrupts the isotropic motion of molecules in organic solvents. Here, we establish a quantitative correlation between the atomic structure of the alignment medium, the molecular structure of the small molecule, and molecule-specific anisotropic NMR parameters. The quantitative correlation uses an accurate three-dimensional molecular alignment model that predicts residual dipolar couplings of small molecules aligned by poly(γ-benzyl-l-glutamate). The technique facilitates reliable determination of the correct stereoisomer and enables unequivocal, rapid determination of complex molecular structures from extremely sparse NMR data.
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Affiliation(s)
- Alain Ibáñez de Opakua
- Structural Biology in DementiaGerman Center for Neurodegenerative Diseases (DZNE)Von-Siebold-Strasse 3a37075GöttingenGermany
| | - Frederik Klama
- Department for NMR-based Structural BiologyMax Planck Institute for Biophysical ChemistryAm Fassberg 1137077GöttingenGermany
| | - Ikenna E. Ndukwe
- Analytical Research & Development (Rahway)Merck & Co. Inc.KenilworthNJUSA
- Complex Carbohydrate Research CenterUniversity of GeorgiaAthensGA30602USA
| | - Gary E. Martin
- Analytical Research & Development (Rahway)Merck & Co. Inc.KenilworthNJUSA
- Department of Chemistry and BiochemistrySeton Hall UniversitySouth OrangeNJ07079USA
| | - R. Thomas Williamson
- Analytical Research & Development (Rahway)Merck & Co. Inc.KenilworthNJUSA
- Department of Chemistry & BiochemistryUniversity of North Carolina WilmingtonWilmingtonNC28409USA
| | - Markus Zweckstetter
- Structural Biology in DementiaGerman Center for Neurodegenerative Diseases (DZNE)Von-Siebold-Strasse 3a37075GöttingenGermany
- Department for NMR-based Structural BiologyMax Planck Institute for Biophysical ChemistryAm Fassberg 1137077GöttingenGermany
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5
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Ibáñez de Opakua A, Klama F, Ndukwe IE, Martin GE, Williamson RT, Zweckstetter M. Bestimmung komplexer kleiner Molekülstrukturen mittels molekularer Ausrichtungssimulation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202000311] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alain Ibáñez de Opakua
- Translationale Strukturelle Biologie der DemenzDeutsches Zentrum für Neurodegenerative Erkrankungen (DZNE) Von-Siebold-Str. 3a 37075 Göttingen Deutschland
| | - Frederik Klama
- Abteilung für NMR-basierte StrukturbiologieMax-Planck-Institut für Biophysikalische Chemie Am Fassberg 11 37077 Göttingen Deutschland
| | - Ikenna E. Ndukwe
- Analytical Research & Development (Rahway), Merck & Co. Inc. Kenilworth NJ USA
- Complex Carbohydrate Research CenterUniversity of Georgia Athens GA 30602 USA
| | - Gary E. Martin
- Analytical Research & Development (Rahway), Merck & Co. Inc. Kenilworth NJ USA
- Department of Chemistry and BiochemistrySeton Hall University South Orange NJ 07079 USA
| | - R. Thomas Williamson
- Analytical Research & Development (Rahway), Merck & Co. Inc. Kenilworth NJ USA
- Department of Chemistry & BiochemistryUniversity of North Carolina Wilmington Wilmington NC 28409 USA
| | - Markus Zweckstetter
- Translationale Strukturelle Biologie der DemenzDeutsches Zentrum für Neurodegenerative Erkrankungen (DZNE) Von-Siebold-Str. 3a 37075 Göttingen Deutschland
- Abteilung für NMR-basierte StrukturbiologieMax-Planck-Institut für Biophysikalische Chemie Am Fassberg 11 37077 Göttingen Deutschland
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6
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Doppler A, Nicholls LDM, Golz C, Alcarazo M, John M. Orientation and conformation of two [6]carbohelicenes in stretched polystyrene and a thermoresponsive polyaspartate. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:961-967. [PMID: 31291475 DOI: 10.1002/mrc.4921] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 07/03/2019] [Accepted: 07/05/2019] [Indexed: 06/09/2023]
Abstract
Two functionalized [6]carbohelicenes, one of which was also available in its two enantiomeric pure forms, were oriented in stretched polystyrene in CDCl3 , and in a recently introduced chiral thermoresponsive lyotropic polyaspartate (poly(benzyl)0.5 (phenethyl)0.5 -L-aspartate) in C2 D2 Cl4 . From the resulting 1 H,13 C residual dipolar couplings, the helical pitch of a methylated [6]carbohelicene was determined and found to be in agreement with theoretical predictions and existing crystal structures (d(C2,C2') ≈ 4.3 Å). For a second [6]carbohelicene with para-methoxyphenyl substituents, a clear conformational preference of the substituents was observed. The orientational properties of the two helicene enantiomers in the chiral polyaspartate are very similar, but both drastically change around 306 K. We suggest this behavior is due to an unusual phase transition in the liquid crystal.
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Affiliation(s)
- Anna Doppler
- Fakultät für Chemie, Georg-August-Universität, Göttingen, Germany
| | - Leo D M Nicholls
- Fakultät für Chemie, Georg-August-Universität, Göttingen, Germany
| | - Christopher Golz
- Fakultät für Chemie, Georg-August-Universität, Göttingen, Germany
| | - Manuel Alcarazo
- Fakultät für Chemie, Georg-August-Universität, Göttingen, Germany
| | - Michael John
- Fakultät für Chemie, Georg-August-Universität, Göttingen, Germany
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7
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Tzvetkova P, Sternberg U, Gloge T, Navarro-Vázquez A, Luy B. Configuration determination by residual dipolar couplings: accessing the full conformational space by molecular dynamics with tensorial constraints. Chem Sci 2019; 10:8774-8791. [PMID: 31803450 PMCID: PMC6849632 DOI: 10.1039/c9sc01084j] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 07/19/2019] [Indexed: 12/27/2022] Open
Abstract
Residual dipolar couplings (RDCs) and other residual anisotropic NMR parameters provide valuable structural information of high quality and quantity, bringing detailed structural models of flexible molecules in solution in reach. The corresponding data interpretation so far is directly or indirectly based on the concept of a molecular alignment tensor, which, however, is ill-defined for flexible molecules. The concept is typically applied to a single or a small set of lowest energy structures, ignoring the effect of vibrational averaging. Here, we introduce an entirely different approach based on time averaged molecular dynamics with dipolar couplings as tensorial orientational restraints that can be used to solve structural problems in molecules of any size without the need of introducing an explicit molecular alignment tensor into the computation. RDC restraints are represented by their full 3D interaction tensor in the laboratory frame, for which pseudo forces are calculated using a secular dipolar Hamiltonian as the target. The resulting rotational averaging of each individual tensorial restraint leads to structural ensembles that best fulfil the experimental data. Using one-bond RDCs, the approach has been implemented in the force field procedures of the program COSMOS and extensively tested. A concise theoretical introduction, including the special treatment of force fields for stable and fast MD simulations, as well as applications regarding configurational analyses of small to medium-sized organic molecules with different degrees of flexibility, is given. The observed results are discussed in detail.
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Affiliation(s)
- Pavleta Tzvetkova
- Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance , Karlsruhe Institute of Technology (KIT) , Fritz-Haber-Weg 6 , 76131 Karlsruhe , Germany . ;
| | - Ulrich Sternberg
- Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance , Karlsruhe Institute of Technology (KIT) , Fritz-Haber-Weg 6 , 76131 Karlsruhe , Germany . ;
| | - Thomas Gloge
- Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance , Karlsruhe Institute of Technology (KIT) , Fritz-Haber-Weg 6 , 76131 Karlsruhe , Germany . ;
| | - Armando Navarro-Vázquez
- Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance , Karlsruhe Institute of Technology (KIT) , Fritz-Haber-Weg 6 , 76131 Karlsruhe , Germany . ;
| | - Burkhard Luy
- Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance , Karlsruhe Institute of Technology (KIT) , Fritz-Haber-Weg 6 , 76131 Karlsruhe , Germany . ;
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8
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Wei Z, Zhang J, Yang H, Jiang G. Catalytic Asymmetric Cascade Cyclization for Constructing Three Contiguous Stereocenters in Pyrrolobenzodiazepine-Based Cyclopentanones. Org Lett 2019; 21:2790-2794. [DOI: 10.1021/acs.orglett.9b00749] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhao Wei
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jinlong Zhang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, P. R. China
| | - Huameng Yang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, P. R. China
| | - Gaoxi Jiang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, P. R. China
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9
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Wu Q, Ye F, Li XL, Liang LF, Sun J, Sun H, Guo YW, Wang H. Uncommon Polyoxygenated Sesquiterpenoids from South China Sea Soft Coral Lemnalia flava. J Org Chem 2019; 84:3083-3092. [PMID: 30762361 DOI: 10.1021/acs.joc.8b02912] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A detailed chemical investigation of the Chinese soft coral Lemnalia flava yielded four new nardosinane-type sesquiterpenoids (1-4), one new neolemnane-type sesquiterpenoid (5), and one new sesquiterpenoid with an uncommon 6/9 fused bicyclic skeleton (6), together with two known related compounds (7 and 8). The structures and absolute configurations of 1-8 were determined on the basis of extensive spectroscopic data analyses, X-ray diffraction analysis, chemical reactions, and computer-assisted structural elucidation including 13C NMR data calculation, residual dipolar coupling based NMR analysis, and time-dependent density functional theoryelectronic circular dichroism calculation. Plausible biogenetic pathways of two uncommon sesquiterpenoids (4 and 6) were proposed.
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Affiliation(s)
- Qihao Wu
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals , Zhejiang University of Technology , Hangzhou , China.,State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica , Chinese Academy of Sciences , 555 Zu Chong Zhi Road , Zhangjiang Hi-Tech Park, Shanghai 201203 , China
| | - Fei Ye
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica , Chinese Academy of Sciences , 555 Zu Chong Zhi Road , Zhangjiang Hi-Tech Park, Shanghai 201203 , China
| | - Xiao-Lu Li
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) , Robert-Rössle-Str. 10 , Berlin 13125 , Germany
| | - Lin-Fu Liang
- College of Material Science and Engineering , Central South University of Forestry and Technology , Changsha 410004 , China
| | - Jiadong Sun
- Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) , National Institutes of Health , Bethesda , Maryland 20892 , United States
| | - Han Sun
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) , Robert-Rössle-Str. 10 , Berlin 13125 , Germany
| | - Yue-Wei Guo
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals , Zhejiang University of Technology , Hangzhou , China.,State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica , Chinese Academy of Sciences , 555 Zu Chong Zhi Road , Zhangjiang Hi-Tech Park, Shanghai 201203 , China
| | - Hong Wang
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals , Zhejiang University of Technology , Hangzhou , China
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10
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Yang M, Li XL, Wang JR, Lei X, Tang W, Li XW, Sun H, Guo YW. Sarcomililate A, an Unusual Diterpenoid with Tricyclo[11.3.0.02,16]hexadecane Carbon Skeleton, and Its Potential Biogenetic Precursors from the Hainan Soft Coral Sarcophyton mililatensis. J Org Chem 2019; 84:2568-2576. [DOI: 10.1021/acs.joc.8b03020] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Min Yang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Xiao-Lu Li
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, Berlin 13125, Germany
| | - Jian-Rong Wang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, P. R. China
| | - Xinxiang Lei
- School of Pharmaceutical Sciences, South Central University for Nationalities, Wuhan 430074, P. R. China
| | - Wei Tang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, P. R. China
| | - Xu-Wen Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Han Sun
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, Berlin 13125, Germany
| | - Yue-Wei Guo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
- College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, P. R. China
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11
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Wang Q, Zhang T, Fan Y, Fan X. Synthesis of functionalized cyclopentenes through allenic ketone-based multicomponent reactions. Org Biomol Chem 2018; 16:8854-8858. [PMID: 30411769 DOI: 10.1039/c8ob02259c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A novel and efficient synthesis of diversely functionalized cyclopentene derivatives through the multicomponent reactions of 1,2-allenic ketones with 4-chloroacetoacetate and malononitrile/cyanoacetate under mild and metal-free conditions is presented. Mechanistically, the formation of title compounds involves a cascade process including nucleophilic substitution, Michael addition and intramolecular aldol type reaction. Interestingly, when 1-phenyl allenic ketones bearing electron-donating groups on the phenyl ring were reacted with 4-chloroacetoacetate and cyanoacetate, methylenecyclo-pentanes, the regioisomer of cyclopentenes, were formed with good selectivity and high efficiency.
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Affiliation(s)
- Qiang Wang
- College of Chemistry and Chemical Engineering, Henan Key Laboratory of Coal Green Conversion, Henan Polytechnic University, Jiaozuo, Henan 454000, P. R. China.
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12
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Surender B, Vinaykumar A, Kumar BS, Vemulapalli SPB, Rao BV. Stereoselective Total Synthesis of (-)-6- epi-Hygrophorone B 14and (-)-4- epi-Hygrophorone D 14. ChemistrySelect 2018. [DOI: 10.1002/slct.201801621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Banothu Surender
- Organic synthesis and process Chemistry Division; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007, India
| | - Allam Vinaykumar
- Organic synthesis and process Chemistry Division; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007, India
| | - Bejugam Santhosh Kumar
- Organic synthesis and process Chemistry Division; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007, India
| | | | - Batchu Venkateswara Rao
- Organic synthesis and process Chemistry Division; CSIR-Indian Institute of Chemical Technology; Hyderabad 500007, India
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13
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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: 44] [Impact Index Per Article: 7.3] [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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14
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Su X, Chen B, Wang S, Chen H, Chen C. Atom- and Step-Efficient Construction of Five-Membered Carbocycles with Alkenes and Alkynes Catalyzed by AgSbF6. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02448] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Xiang Su
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education, MOE), Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Bifeng Chen
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education, MOE), Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Shaohong Wang
- Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences. Beijing, 100190, China
| | - Hui Chen
- Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences. Beijing, 100190, China
| | - Chao Chen
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education, MOE), Department of Chemistry, Tsinghua University, Beijing, 100084, China
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15
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Lakshmi JK, Pattnaik B, Kavitha R, Mallavadhani UV, Jagadeesh B. Conformation of flexibly linked triterpene dimers by using RDC-enhanced NMR spectroscopy. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.02.083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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16
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Otto A, Porzel A, Westermann B, Brandt W, Wessjohann L, Arnold N. Structural and stereochemical elucidation of new hygrophorones from Hygrophorus abieticola (Basidiomycetes). Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.02.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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17
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Schmidts V. Perspectives in the application of residual dipolar couplings in the structure elucidation of weakly aligned small molecules. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2017; 55:54-60. [PMID: 27743456 DOI: 10.1002/mrc.4543] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 10/10/2016] [Accepted: 10/13/2016] [Indexed: 05/28/2023]
Abstract
This perspective article aims to review the general methodology in the application of residual dipolar couplings (RDCs) in the structure elucidation of small molecules and give the author's view on challenges for future applications. Recent improvements in the availability of alignment media, new pulse sequences for the measurement of couplings and improvements in the analysis software have garnered widespread interest in the technique. However, further generalization is needed in order to make RDC analysis into a truly "routine" method. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Volker Schmidts
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Darmstadt, Germany
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18
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Liang Y, Lai J, Liu T, Tang S. Direct Regioselective [3 + 2]-Cyclization Reactions of Ambivalent Electrophilic/Nucleophilic β-Chlorovinyl Dithianes: Access to Cyclopentene Derivatives. Org Lett 2016; 18:5086-5089. [PMID: 27624691 DOI: 10.1021/acs.orglett.6b02536] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The highly regioselective and operationally straightforward [3 + 2] cyclizations of β-chlorovinyl dithianes with α,β-unsaturated carbonyl compounds have been developed. This protocol provides direct access to highly functionalized cyclopentenes with perfect chemo- and regioselectivities under extremely mild reaction conditions. In particular, the unprecedented cyclization allows for the selective preparation of hydroxylated cyclopentenes.
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Affiliation(s)
- Yongping Liang
- School of Pharmacy and ‡State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, P. R. China
| | - Junshan Lai
- School of Pharmacy and ‡State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, P. R. China
| | - Teng Liu
- School of Pharmacy and ‡State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, P. R. China
| | - Shouchu Tang
- School of Pharmacy and ‡State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, P. R. China
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19
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Zong W, Li GW, Cao JM, Lei X, Hu ML, Sun H, Griesinger C, Tan RX. An Alignment Medium for Measuring Residual Dipolar Couplings in Pure DMSO: Liquid Crystals from Graphene Oxide Grafted with Polymer Brushes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201511435] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wen Zong
- College of Chemistry & Materials Engineering; Wenzhou University; Wenzhou 325035 P.R. China
| | - Gao-Wei Li
- Institute of Functional Biomolecules; State Key Laboratory of Pharmaceutical Biotechnology; Nanjing University; Nanjing 210093 P.R. China
| | - Jiang-Ming Cao
- Institute of Functional Biomolecules; State Key Laboratory of Pharmaceutical Biotechnology; Nanjing University; Nanjing 210093 P.R. China
| | - Xinxiang Lei
- College of Chemistry & Materials Engineering; Wenzhou University; Wenzhou 325035 P.R. China
| | - Mao-Lin Hu
- College of Chemistry & Materials Engineering; Wenzhou University; Wenzhou 325035 P.R. China
| | - Han Sun
- Leibniz-Institut für Molekulare Pharmakologie (FMP); Robert-Roessle-Strasse 10 13125 Berlin Germany
| | - Christian Griesinger
- Department of NMR-based Structural Biology; Max Planck Institute for Biophysical Chemistry; 37077 Göttingen Germany
| | - Ren Xiang Tan
- Institute of Functional Biomolecules; State Key Laboratory of Pharmaceutical Biotechnology; Nanjing University; Nanjing 210093 P.R. China
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20
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Zong W, Li GW, Cao JM, Lei X, Hu ML, Sun H, Griesinger C, Tan RX. An Alignment Medium for Measuring Residual Dipolar Couplings in Pure DMSO: Liquid Crystals from Graphene Oxide Grafted with Polymer Brushes. Angew Chem Int Ed Engl 2016; 55:3690-3. [DOI: 10.1002/anie.201511435] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Wen Zong
- College of Chemistry & Materials Engineering; Wenzhou University; Wenzhou 325035 P.R. China
| | - Gao-Wei Li
- Institute of Functional Biomolecules; State Key Laboratory of Pharmaceutical Biotechnology; Nanjing University; Nanjing 210093 P.R. China
| | - Jiang-Ming Cao
- Institute of Functional Biomolecules; State Key Laboratory of Pharmaceutical Biotechnology; Nanjing University; Nanjing 210093 P.R. China
| | - Xinxiang Lei
- College of Chemistry & Materials Engineering; Wenzhou University; Wenzhou 325035 P.R. China
| | - Mao-Lin Hu
- College of Chemistry & Materials Engineering; Wenzhou University; Wenzhou 325035 P.R. China
| | - Han Sun
- Leibniz-Institut für Molekulare Pharmakologie (FMP); Robert-Roessle-Strasse 10 13125 Berlin Germany
| | - Christian Griesinger
- Department of NMR-based Structural Biology; Max Planck Institute for Biophysical Chemistry; 37077 Göttingen Germany
| | - Ren Xiang Tan
- Institute of Functional Biomolecules; State Key Laboratory of Pharmaceutical Biotechnology; Nanjing University; Nanjing 210093 P.R. China
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21
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Hansmann S, Larem née Montag T, Thiele CM. Enantiodifferentiating Properties of the Alignment Media PELG and PBLG - A Comparison. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501410] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Liu LY, Sun H, Griesinger C, Liu JK. The Use of a Combination of RDC and Chiroptical Spectroscopy for Determination of the Absolute Configuration of Fusariumin A from the Fungus Fusarium sp. NATURAL PRODUCTS AND BIOPROSPECTING 2016; 6:41-8. [PMID: 26791752 PMCID: PMC4749523 DOI: 10.1007/s13659-015-0084-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Accepted: 12/21/2015] [Indexed: 05/28/2023]
Abstract
A new alkylpyrrole derivative, fusariumin A (1), was isolated from the culture broth of the fungus Fusarium sp. The absolute configuration of fuasiumin A has been established as (2'R,3'R) using a combination of RDC (residual dipolar coupling)-based NMR and DFT-supported chiroptical spectroscopy. It is worth to note that in this study without the aid of the RDC analysis, an unambiguous determination of configuration and conformation was not feasible due to the excessive conformational possibilities of this open-chain compound.
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Affiliation(s)
- Liang-Yan Liu
- College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming, 650201, China
| | - Han Sun
- Department of NMR-based Structural Biology, Max-Planck-Institute of Biophysical Chemistry, Am Fassberg 11, 37077, Göttingen, Germany
- Leibniz-Institut für Molekulare Pharmakologie, 13125, Berlin, Germany
| | - Christian Griesinger
- Department of NMR-based Structural Biology, Max-Planck-Institute of Biophysical Chemistry, Am Fassberg 11, 37077, Göttingen, Germany.
| | - Ji-Kai Liu
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan, 430074, China.
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23
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Otto A, Porzel A, Schmidt J, Brandt W, Wessjohann L, Arnold N. Structure and Absolute Configuration of Pseudohygrophorones A(12) and B(12), Alkyl Cyclohexenone Derivatives from Hygrophorus abieticola (Basidiomycetes). JOURNAL OF NATURAL PRODUCTS 2016; 79:74-80. [PMID: 26722697 DOI: 10.1021/acs.jnatprod.5b00675] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Pseudohygrophorones A(12) (1) and B(12) (2), the first naturally occurring alkyl cyclohexenones from a fungal source, and the recently reported hygrophorone B(12) (3) have been isolated from fruiting bodies of the basidiomycete Hygrophorus abieticola Krieglst. ex Gröger & Bresinsky. Their structures were assigned on the basis of extensive one- and two-dimensional NMR spectroscopic analysis as well as ESI-HRMS measurements. The absolute configuration of the three stereogenic centers in the diastereomeric compounds 1 and 2 was established with the aid of (3)JH,H and (4)JH,H coupling constants, NOE interactions, and conformational analysis in conjunction with quantum chemical CD calculations. It was concluded that pseudohygrophorone A(12) (1) is 4S,5S,6S configured, while pseudohygrophorone B(12) (2) was identified as the C-6 epimer of 1, corresponding to the absolute configuration 4S,5S,6R. In addition, the mass spectrometric fragmentation behavior of 1-3 obtained by the higher energy collisional dissociation method allows a clear distinction between the pseudohygrophorones (1 and 2) and hygrophorone B(12) (3). The isolated compounds 1-3 exhibited pronounced activity against phytopathogenic organisms.
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Affiliation(s)
- Alexander Otto
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Andrea Porzel
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Jürgen Schmidt
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Wolfgang Brandt
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Ludger Wessjohann
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
| | - Norbert Arnold
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry , Weinberg 3, D-06120 Halle/Saale, Germany
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24
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Kolmer A, Edwards LJ, Kuprov I, Thiele CM. Conformational analysis of small organic molecules using NOE and RDC data: A discussion of strychnine and α-methylene-γ-butyrolactone. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 261:101-109. [PMID: 26556179 DOI: 10.1016/j.jmr.2015.10.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 10/02/2015] [Accepted: 10/07/2015] [Indexed: 06/05/2023]
Abstract
To understand the properties and/or reactivity of an organic molecule, an understanding of its three-dimensional structure is necessary. Simultaneous determination of configuration and conformation often poses a daunting challenge. Thus, the more information accessible for a given molecule, the better. Additionally to (3)J-couplings, two sources of information, quantitative NOE and more recently also RDCs, are used for conformational analysis by NMR spectroscopy. In this paper, we compare these sources of conformational information in two molecules: the configurationally well-characterized strychnine 1, and the only recently configurationally and conformationally characterized α-methylene-γ-butyrolactone 2. We discuss possible sources of error in the measurement and analysis process, and how to exclude them. By this means, we are able to bolster the previously proposed flexibility for these two molecules.
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Affiliation(s)
- Andreas Kolmer
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Strasse 16, 64287 Darmstadt, Germany
| | - Luke J Edwards
- Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QG, United Kingdom
| | - Ilya Kuprov
- School of Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, University Road, Southampton SO17 1BJ, United Kingdom
| | - Christina M Thiele
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Strasse 16, 64287 Darmstadt, Germany.
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25
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Niklas T, Steinmetzger C, Liu W, Zell D, Stalke D, Ackermann L, John M. Determination of the Relative Configuration of β-Amino Acid Esters Based on Residual Dipolar Couplings. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500941] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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26
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Otto A, Porzel A, Schmidt J, Wessjohann L, Arnold N. A study on the biosynthesis of hygrophorone B(12) in the mushroom Hygrophorus abieticola reveals an unexpected labelling pattern in the cyclopentenone moiety. PHYTOCHEMISTRY 2015; 118:174-180. [PMID: 26342622 DOI: 10.1016/j.phytochem.2015.08.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 08/21/2015] [Accepted: 08/27/2015] [Indexed: 06/05/2023]
Abstract
The hitherto unknown natural formation of hygrophorones, antibacterial and antifungal cyclopentenone derivatives from mushrooms, was investigated for hygrophorone B(12) in Hygrophorus abieticola Krieglst. ex Gröger & Bresinsky by feeding experiments in the field using (13)C labelled samples of D-glucose and sodium acetate. The incorporation of (13)C isotopes was extensively studied using 1D and 2D NMR spectroscopy as well as ESI-HRMS analyses. In the experiment with [U-(13)C6]-glucose, six different (13)C2 labelled isotopomers were observed in the 2D INADEQUATE spectrum due to incorporation of [1,2-(13)C2]-acetyl-CoA. This labelling pattern demonstrated that hygrophorone B(12) is derived from a fatty acid-polyketide route instead of a 1,4-α-D-glucan derived anhydrofructose pathway. The experiment with [2-(13)C]-acetate revealed an unexpected incorporation pattern in the cyclopentenone functionality of hygrophorone B(12). Four single-labelled isotopomers, in particular [1-(13)C]-, [2-(13)C]-, [3-(13)C]-, and [4-(13)C]-hygrophorone B(12), were detected that showed only half enrichment in comparison to the respective labelled alkyl side chain carbons. This labelling pattern indicates the formation of a symmetrical intermediate during hygrophorone B(12) biosynthesis. Based on these observations, a biogenetic route via a 4-oxo fatty acid and a chrysotrione B homologue is discussed.
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Affiliation(s)
- Alexander Otto
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle/Saale, Germany
| | - Andrea Porzel
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle/Saale, Germany
| | - Jürgen Schmidt
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle/Saale, Germany
| | - Ludger Wessjohann
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle/Saale, Germany
| | - Norbert Arnold
- Department of Bioorganic Chemistry, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120 Halle/Saale, Germany.
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27
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Fredersdorf M, Göstl R, Kolmer A, Schmidts V, Monecke P, Hecht S, Thiele CM. Exploring the Conformational Space of Bridge-Substituted Dithienylcyclopentenes. Chemistry 2015; 21:14545-54. [DOI: 10.1002/chem.201501842] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Indexed: 11/08/2022]
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28
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Bette E, Otto A, Dräger T, Merzweiler K, Arnold N, Wessjohann L, Westermann B. Isolation and Asymmetric Total Synthesis of Fungal Secondary Metabolite Hygrophorone B12. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403455] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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29
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Lesot P, Aroulanda C, Zimmermann H, Luz Z. Enantiotopic discrimination in the NMR spectrum of prochiral solutes in chiral liquid crystals. Chem Soc Rev 2015; 44:2330-75. [DOI: 10.1039/c4cs00260a] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Theory and applications to stereo- and bio-chemistry of the discrimination of enantiotopic elements observed in the NMR spectra of prochiral solutes dissolved in chiral liquid crystals are comprehensively discussed.
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Affiliation(s)
- Philippe Lesot
- Laboratoire de RMN en Milieu Orienté CNRS UMR 8182
- ICMMO
- 91405 Orsay cedex
- France
| | - Christie Aroulanda
- Laboratoire de RMN en Milieu Orienté CNRS UMR 8182
- ICMMO
- 91405 Orsay cedex
- France
| | - Herbert Zimmermann
- Abteilung Biophysik
- Max-Planck-Institut für Medizinische Forschung
- 69120 Heidelberg
- Germany
| | - Zeev Luz
- Weizmann Institute of Science
- Department of Chemical Physics
- Rehovot 76100
- Israel
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30
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Kalaitzakis D, Triantafyllakis M, Alexopoulou I, Sofiadis M, Vassilikogiannakis G. One-Pot Transformation of Simple Furans into 4-Hydroxy-2-cyclopentenones in Water. Angew Chem Int Ed Engl 2014; 53:13201-5. [DOI: 10.1002/anie.201407477] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 08/22/2014] [Indexed: 11/06/2022]
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31
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Kalaitzakis D, Triantafyllakis M, Alexopoulou I, Sofiadis M, Vassilikogiannakis G. One-Pot Transformation of Simple Furans into 4-Hydroxy-2-cyclopentenones in Water. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201407477] [Citation(s) in RCA: 7] [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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32
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Kakita VMR, Rachineni K, Bharatam J. Unambiguous determination of conformation and relative configuration of a multiple stereo-centre molecule Rifamycin-S by using scaled residual dipolar couplings: A case study. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.08.061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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