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Xiong B, Si L, Zhu L, Liu Y, Xu W, Tang KW, Yin SF, Qian PC, Wong WY. Copper-Catalyzed Aerobic Oxidative/Decarboxylative Phosphorylation of Aryl Acrylic Acids with P(III)-Nucleophiles. J Org Chem 2023; 88:12502-12518. [PMID: 37579226 DOI: 10.1021/acs.joc.3c01238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
A copper-catalyzed aerobic oxidative/decarboxylative phosphorylation of aryl acrylic acids with P(III)-nucleophiles via the Michaelis-Arbuzov rearrangement for the synthesis of β-ketophosphine oxides, β-ketophosphinates, and β-ketophosphonates is reported. The present reaction could be conducted effectively without the use of a ligand and a base. Various kinds of aryl acrylic acids and P(III)-nucleophiles are tolerated in the transformation, generating the desired β-keto-organophosphorus compounds as a valuable class of phosphorus-containing intermediates with good to excellent yields. In addition, the possible mechanism and kinetic studies for the reaction have been explored by step-by-step control experiments and competitive experiments, and the results proved that this transformation may follow second-order chemical kinetics as well as involve a radical process.
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Affiliation(s)
- Biquan Xiong
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 00000, P. R. China
| | - Lulu Si
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China
| | - Longzhi Zhu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China
| | - Yu Liu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China
| | - Weifeng Xu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China
| | - Ke-Wen Tang
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China
| | - Shuang-Feng Yin
- Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Peng-Cheng Qian
- Key Laboratory of Environmental Functional Materials Technology and Application of Wenzhou City, Institute of New Materials & Industry Technology, College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035 Zhejiang, P. R. China
| | - Wai-Yeung Wong
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 00000, P. R. China
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2
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Kirsch SH, Haeckl FPJ, Müller R. Beyond the approved: target sites and inhibitors of bacterial RNA polymerase from bacteria and fungi. Nat Prod Rep 2022; 39:1226-1263. [PMID: 35507039 DOI: 10.1039/d1np00067e] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Covering: 2016 to 2022RNA polymerase (RNAP) is the central enzyme in bacterial gene expression representing an attractive and validated target for antibiotics. Two well-known and clinically approved classes of natural product RNAP inhibitors are the rifamycins and the fidaxomycins. Rifampicin (Rif), a semi-synthetic derivative of rifamycin, plays a crucial role as a first line antibiotic in the treatment of tuberculosis and a broad range of bacterial infections. However, more and more pathogens such as Mycobacterium tuberculosis develop resistance, not only against Rif and other RNAP inhibitors. To overcome this problem, novel RNAP inhibitors exhibiting different target sites are urgently needed. This review includes recent developments published between 2016 and today. Particular focus is placed on novel findings concerning already known bacterial RNAP inhibitors, the characterization and development of new compounds isolated from bacteria and fungi, and providing brief insights into promising new synthetic compounds.
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Affiliation(s)
- Susanne H Kirsch
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University Campus, 66123 Saarbrücken, Germany. .,German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, 38124 Braunschweig, Germany
| | - F P Jake Haeckl
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University Campus, 66123 Saarbrücken, Germany. .,German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, 38124 Braunschweig, Germany
| | - Rolf Müller
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University Campus, 66123 Saarbrücken, Germany. .,German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, 38124 Braunschweig, Germany.,Department of Pharmacy, Saarland University, 66123 Saarbrücken, Germany
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3
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Zhang R, Genov M, Pretsch A, Pretsch D, Moloney MG. Mediation of metal chelation in cysteine-derived tetramate systems. Chem Sci 2021; 12:16106-16122. [PMID: 35024133 PMCID: PMC8672780 DOI: 10.1039/d1sc05542a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 11/22/2021] [Indexed: 12/11/2022] Open
Abstract
A study of bicyclic tetramates modified with a bulky ester, which leads to steric hindrance of distal chelating atoms as a route for the alteration of metal binding ability is reported. This approach required the development of a direct method for the synthesis of different esters of cysteine from cystine, which then provided access to bicyclic tetramates by Dieckmann cyclisation. Further derivation to ketones and carboxamides by Grignard addition and transamination reactions respectively provided rapid access to a chemical library of tetramates with diverse substitution. Of interest is that bicyclic tetramate ketones and carboxamides showed different tautomeric and metal binding behaviour in solution. Significantly, in both systems, the incorporation of bulky C-5 esters at the bridging position not only reduced metal binding, but also enhanced antibacterial potencies against Gram-positive MRSA bacteria. Those tetramates with antibacterial activity which was not metal dependent showed physiochemical properties of MSA of 559-737 Å2, MW of 427-577 Da, clogP of 1.8-6.1, clogD7.4 of -1.7 to 3.7, PSA of 83-109 Å2 and relative PSA of 12-15% and were generally Lipinski rule compliant. A subset of tetramates exhibited good selectivity towards prokaryotic bacterial cells. Given that the work reported herein is synthesis-led, without the underpinning detailed mechanistic understanding of biological/biochemical mechanism, that the most active compounds occupy a small region of chemical space as defined by MW, clogP, PSA and %PSA is of interest. Overall, the bicyclic tetramate template is a promising structural motif for the development of novel antibacterial drugs, with good anti-MRSA potencies and appropriate drug-like physiochemical properties, coupled with a potential for multi-targeting mechanisms and low eukaryotic cytotoxicity.
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Affiliation(s)
- Ruirui Zhang
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK
| | - Miroslav Genov
- Oxford Antibiotic Group The Oxford Science Park, Magdalen Centre Oxford OX4 4GA UK
| | - Alexander Pretsch
- Oxford Antibiotic Group The Oxford Science Park, Magdalen Centre Oxford OX4 4GA UK
| | - Dagmar Pretsch
- Oxford Antibiotic Group The Oxford Science Park, Magdalen Centre Oxford OX4 4GA UK
| | - Mark G Moloney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK .,Oxford Suzhou Centre for Advanced Research Building A, 388 Ruo Shui Road, Suzhou Industrial Park Jiangsu 215123 P. R. China
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4
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Zhang R, Genov M, Pretsch A, Pretsch D, Moloney MG. Metal Binding and Its Amelioration in Tetramates. J Org Chem 2021; 86:12886-12907. [PMID: 34465089 DOI: 10.1021/acs.joc.1c01541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Metal chelation in tetramates may be ameliorated by changing the ligating group and by steric blocking, which in turn leads to a change in their antibacterial properties; the former was achieved by replacement of an amide with a C-9 C═N bond and the latter by the synthesis of cysteine-derived tetramates with functionalization at the C-6 or C-9 enolic groups. In both cases, the metal-chelating ability was weak, and a loss of antibacterial activity was observed. Tetramate alkylations with an extended tricarbonyl-conjugated system could be achieved under Mitsunobu conditions which led to regioisomers, distinguishable by careful heteronuclear multiple bond coherence correlation and carbonyl carbon chemical shift analysis. C-9 and C-6 O-alkylation were observed but not C-8 O-alkylation for tetramate carboxamides; interestingly, C-7 alkylation with allyl and prenyl derivatives was also observed, and this arose by the rearrangement of initially formed O-alkyl products. Only the C-7 alkylated tetramate derivatives 13a and 13d with no metal-chelating ability demonstrated promising antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA), with the most active analogue exhibiting a minimum inhibitory concentration of ≤ 1.95 μg/mL against MRSA, suggesting a mechanism of action independent of metal chelation. Otherwise, modifications at C-6/C-9 of tetramates led to a complete loss of metal-chelating ability, which correlated with the loss of antibacterial activity. This work further confirms that the metal-chelating capability is of fundamental importance in the biological activity of tetramates.
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Affiliation(s)
- Ruirui Zhang
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Miroslav Genov
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Alexander Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Dagmar Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Mark G Moloney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.,Oxford Suzhou Centre for Advanced Research, Building A, 388 Ruo Shui Road, Suzhou Industrial Park, Jiangsu 215123, P.R. China
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Mantel M, Giesler M, Guder M, Rüthlein E, Hartmann L, Pietruszka J. Lewis‐Base‐Brønsted‐Säure‐Enzym‐Katalyse in enantioselektiven mehrstufigen Eintopf‐Synthesen. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Marvin Mantel
- Institut für Bioorganische Chemie Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich Stetternicher Forst, Geb. 15.8 52426 Jülich Deutschland
| | - Markus Giesler
- Institut für Organische und Makromolekulare Chemie Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Deutschland
| | - Marian Guder
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1) Forschungszentrum Jülich GmbH 52428 Jülich Deutschland
| | - Elisabeth Rüthlein
- Institut für Bioorganische Chemie Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich Stetternicher Forst, Geb. 15.8 52426 Jülich Deutschland
| | - Laura Hartmann
- Institut für Organische und Makromolekulare Chemie Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Deutschland
| | - Jörg Pietruszka
- Institut für Bioorganische Chemie Heinrich-Heine-Universität Düsseldorf im Forschungszentrum Jülich Stetternicher Forst, Geb. 15.8 52426 Jülich Deutschland
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1) Forschungszentrum Jülich GmbH 52428 Jülich Deutschland
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6
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Mantel M, Giesler M, Guder M, Rüthlein E, Hartmann L, Pietruszka J. Lewis Base-Brønsted Acid-Enzyme Catalysis in Enantioselective Multistep One-Pot Syntheses. Angew Chem Int Ed Engl 2021; 60:16700-16706. [PMID: 33856095 PMCID: PMC8360128 DOI: 10.1002/anie.202103406] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/08/2021] [Indexed: 12/23/2022]
Abstract
Establishing one-pot, multi-step protocols combining different types of catalysts is one important goal for increasing efficiency in modern organic synthesis. In particular, the high potential of biocatalysts still needs to be harvested. Based on an in-depth mechanistic investigation of a new organocatalytic protocol employing two catalysts {1,4-diazabicyclo[2.2.2]octane (DABCO); benzoic acid (BzOH)}, a sequence was established providing starting materials for enzymatic refinement (ene reductase; alcohol dehydrogenase): A gram-scale access to a variety of enantiopure key building blocks for natural product syntheses was enabled utilizing up to six catalytic steps within the same reaction vessel.
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Affiliation(s)
- Marvin Mantel
- Institut für Bioorganische ChemieHeinrich-Heine-Universität Düsseldorf im Forschungszentrum JülichStetternicher Forst, Geb. 15.852426JülichGermany
| | - Markus Giesler
- Institut für Organische und Makromolekulare ChemieHeinrich-Heine-Universität Düsseldorf40225DüsseldorfGermany
| | - Marian Guder
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1)Forschungszentrum Jülich GmbH52428JülichGermany
| | - Elisabeth Rüthlein
- Institut für Bioorganische ChemieHeinrich-Heine-Universität Düsseldorf im Forschungszentrum JülichStetternicher Forst, Geb. 15.852426JülichGermany
| | - Laura Hartmann
- Institut für Organische und Makromolekulare ChemieHeinrich-Heine-Universität Düsseldorf40225DüsseldorfGermany
| | - Jörg Pietruszka
- Institut für Bioorganische ChemieHeinrich-Heine-Universität Düsseldorf im Forschungszentrum JülichStetternicher Forst, Geb. 15.852426JülichGermany
- Institut für Bio- und Geowissenschaften: Biotechnologie (IBG-1)Forschungszentrum Jülich GmbH52428JülichGermany
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7
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Liu B, Song Q, Liu Z, Wang Z. Silver‐Catalyzed Oxyphosphorylation of Unactivated Alkynes. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Binbin Liu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis Department of Chemistry Northeast Normal University Changchun 130024 People's Republic of China
| | - Qingmin Song
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis Department of Chemistry Northeast Normal University Changchun 130024 People's Republic of China
| | - Zhaohong Liu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis Department of Chemistry Northeast Normal University Changchun 130024 People's Republic of China
| | - Zikun Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis Department of Chemistry Northeast Normal University Changchun 130024 People's Republic of China
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8
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He H, Hao X, Zhou W, Shi N, Feng J, Han L. Identification of antimicrobial metabolites produced by a potential biocontrol Actinomycete strain A217. J Appl Microbiol 2020; 128:1143-1152. [PMID: 31830360 DOI: 10.1111/jam.14548] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 11/30/2019] [Accepted: 12/02/2019] [Indexed: 01/28/2023]
Abstract
AIMS To extract and identify the metabolites of strain A217 as well as its antifungal spectrum and control effect on various plant pathogens. METHODS AND RESULTS Strain A217 was identified as a Streptomyces sp. which was most similar to Streptomyces lienomycini. An antimicrobial spectrum test indicated that strain A217 inhibited several plant pathogenic fungi and strong antibacterial effect such as Phytophthora capsici, Botrytis cinerea, Sclerotinia sclerotiorum, Fusarium oxysporum, Pseudomonas syringae and Xanthomonas campestris. An in vivo tissue test demonstrated that the fermentation broth of strain A217 exerted therapeutic and protective effects of 49·47 and 61·60% respectively, on S. sclerotiorum. Additionally, the fermentation broth of A217 exerted control effects on walnut black spot disease in walnut leaves and branches amounting to 79·33 and 81·52% respectively. In a pot experiment, the fermentation broth exhibited a stronger protective and control effect (68·29%), as well as better bacteriostatic and disease control effects on Phytophthora blight of pepper, compared with Metalaxyl. Compounds possessing antifungal and antibacterial activities were obtained from the fermentation broth of strain A217, using column chromatography and HPLC. Chemical and structural analyses conducted using MS and nuclear magnetic resonance confirmed that these compounds were 1H-pyrrole-2-carboxylic acid and 1H-pyrrole-2-carboxamide. The EC50 values of compound 1H-pyrrole-2-carboxylic acid1 for S. sclerotiorum and P. capsici were 20·13 and 50·36 μg ml-1 respectively. Compound 1H-pyrrole-2-carboxamide2 showed significant antibacterial activity against different plant pathogenic bacteria. The MIC values of P. syringae, X. campestris and X. campestris pv. jugiandis were 7·5, 30 and 15·0 μg ml-1 respectively. CONCLUSIONS Actinomyces A217 fermentation products have a broad spectrum of bacteriostasis, and have good bacteriostasis activity to many plant pathogenic fungi and bacteria. SIGNIFICANCE AND IMPACT OF THE STUDY The present study revealed a new antimicrobial producing strain of Streptomyces and its potential application as a biological control agent for plant diseases.
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Affiliation(s)
- H He
- College of Plant Protection, Northwest A & F University, Yangling, Shaanxi, China
| | - X Hao
- College of Plant Protection, Northwest A & F University, Yangling, Shaanxi, China
| | - W Zhou
- College of Plant Protection, Northwest A & F University, Yangling, Shaanxi, China
| | - N Shi
- College of Plant Protection, Northwest A & F University, Yangling, Shaanxi, China
| | - J Feng
- College of Plant Protection, Northwest A & F University, Yangling, Shaanxi, China
| | - L Han
- College of Plant Protection, Northwest A & F University, Yangling, Shaanxi, China
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Jang J, Kim DY. Transition Metal‐free Phosphorylation of Vinyl Azides: A Convenient Synthesis of β‐Ketophosphine Oxides. B KOREAN CHEM SOC 2020. [DOI: 10.1002/bkcs.11964] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jihoon Jang
- Department of ChemistrySoonchunhyang University Chungnam 31538 South Korea
| | - Dae Young Kim
- Department of ChemistrySoonchunhyang University Chungnam 31538 South Korea
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10
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Panduwawala TD, Iqbal S, Thompson AL, Genov M, Pretsch A, Pretsch D, Liu S, Ebright RH, Howells A, Maxwell A, Moloney MG. Functionalised bicyclic tetramates derived from cysteine as antibacterial agents. Org Biomol Chem 2019; 17:5615-5632. [PMID: 31120090 PMCID: PMC6686852 DOI: 10.1039/c9ob01076a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Routes to bicyclic tetramates derived from cysteine permitting ready incorporation of functionality at two different points around the periphery of a heterocyclic skeleton are reported. This has enabled the identification of systems active against Gram-positive bacteria, some of which show gyrase and RNA polymerase inhibitory activity. In particular, tetramates substituted with glycosyl side chains, chosen to impart polarity and aqueous solubility, show high antibacterial activity coupled with modest gyrase/polymerase activity in two cases. An analysis of physicochemical properties indicates that the antibacterially active tetramates generally occupy physicochemical space with MW of 300-600, clog D7.4 of -2.5 to 4 and rel. PSA of 11-22%. This work demonstrates that biologically active 3D libraries are readily available by manipulation of a tetramate skeleton.
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Affiliation(s)
- Tharindi D Panduwawala
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, UK.
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11
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Feng S, Li J, He F, Li T, Li H, Wang X, Xie X, She X. A copper-catalyzed radical coupling/fragmentation reaction: efficient access to β-oxophosphine oxides. Org Chem Front 2019. [DOI: 10.1039/c9qo00006b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The development of a novel copper-catalyzed three-component radical coupling/fragmentation cascade reaction to generate diverse β-oxophosphine oxides is reported.
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Affiliation(s)
- Shangbiao Feng
- State Key Laboratory of Applied Organic Chemistry
- Department of Chemistry
- Lanzhou University
- Lanzhou
- China
| | - Jinlai Li
- State Key Laboratory of Applied Organic Chemistry
- Department of Chemistry
- Lanzhou University
- Lanzhou
- China
| | - Feifei He
- State Key Laboratory of Applied Organic Chemistry
- Department of Chemistry
- Lanzhou University
- Lanzhou
- China
| | - Tao Li
- State Key Laboratory of Applied Organic Chemistry
- Department of Chemistry
- Lanzhou University
- Lanzhou
- China
| | - Huilin Li
- State Key Laboratory of Applied Organic Chemistry
- Department of Chemistry
- Lanzhou University
- Lanzhou
- China
| | - Xiaolei Wang
- State Key Laboratory of Applied Organic Chemistry
- Department of Chemistry
- Lanzhou University
- Lanzhou
- China
| | - Xingang Xie
- State Key Laboratory of Applied Organic Chemistry
- Department of Chemistry
- Lanzhou University
- Lanzhou
- China
| | - Xuegong She
- State Key Laboratory of Applied Organic Chemistry
- Department of Chemistry
- Lanzhou University
- Lanzhou
- China
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12
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New β-lactam - Tetramic acid hybrids show promising antibacterial activities. Bioorg Med Chem Lett 2018; 28:3105-3112. [PMID: 30097368 DOI: 10.1016/j.bmcl.2018.07.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 07/07/2018] [Accepted: 07/10/2018] [Indexed: 11/21/2022]
Abstract
β-Lactams are the most important class of antibiotics, for which the emergence of resistance threatens their utility. As such, we explored the extent to which the tetramic acid motif, frequently found in naturally occurring antibiotics, can be used to generate novel β-lactam antibiotics with improved antibacterial activity. We synthesized new ampicillin - tetramic acid, cephalosporin - tetramic acid, and cephamycin - tetramic acid analogs and evaluated their activities against problematic Gram-positive and Gram-negative pathogens. Amongst the analogs, a 7-aminocephalosporanic acid analog, 3397, and a 7-amino-3-vinyl cephalosporanic acid, 3436, showed potent activities against S. aureus NRS 70 (MRSA) with MICs of 6.25 μg/mL and 3.13 μg/mL respectively. These new analogs were ≥16-fold more potent than cefaclor and cephalexin. Additionally, a Δ2 cephamycin - tetramic acid analog 3474 which contained a basic guanidinium substituent at the 5-position of the tetramic acid core displayed potent activity against several clinical strains of K. pneumoniae and E. coli.
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13
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Hatakeyama S. Stereocontrolled Total Synthesis of Biologically Active Natural Products. YAKUGAKU ZASSHI 2018; 138:191-209. [DOI: 10.1248/yakushi.17-00187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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X-Ray Crystallographic Analysis, EPR Studies, and Computational Calculations of a Cu(II) Tetramic Acid Complex. Bioinorg Chem Appl 2017; 2017:7895023. [PMID: 28316540 PMCID: PMC5337788 DOI: 10.1155/2017/7895023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Revised: 11/20/2016] [Accepted: 12/25/2016] [Indexed: 11/26/2022] Open
Abstract
In this work we present a structural and spectroscopic analysis of a copper(II) N-acetyl-5-arylidene tetramic acid by using both experimental and computational techniques. The crystal structure of the Cu(II) complex was determined by single crystal X-ray diffraction and shows that the copper ion lies on a centre of symmetry, with each ligand ion coordinated to two copper ions, forming a 2D sheet. Moreover, the EPR spectroscopic properties of the Cu(II) tetramic acid complex were also explored and discussed. Finally, a computational approach was performed in order to obtain a detailed and precise insight of product structures and properties. It is hoped that this study can enrich the field of functional supramolecular systems, giving place to the formation of coordination-driven self-assembly architectures.
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15
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Yang W, Ramadan S, Yang B, Yoshida K, Huang X. Homoserine as an Aspartic Acid Precursor for Synthesis of Proteoglycan Glycopeptide Containing Aspartic Acid and a Sulfated Glycan Chain. J Org Chem 2016; 81:12052-12059. [PMID: 27809505 DOI: 10.1021/acs.joc.6b02441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Among many hurdles in synthesizing proteoglycan glycopeptides, one challenge is the incorporation of aspartic acid in the peptide backbone and acid sensitive O-sulfated glycan chains. To overcome this, a new strategy was developed utilizing homoserine as an aspartic acid precursor. The conversion of homoserine to aspartic acid in the glycopeptide was successfully accomplished by late stage oxidation using (2,2,6,6-tetramethyl-piperidin-1-yl)oxyl (TEMPO) and bis(acetoxy)iodobenzene (BAIB). This is the first time that a glycopeptide containing aspartic acid and an O-sulfated glycan was synthesized.
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Affiliation(s)
- Weizhun Yang
- Department of Chemistry, Michigan State University , 578 South Shaw Lane, East Lansing, Michigan 48824-1322, United States
| | - Sherif Ramadan
- Department of Chemistry, Michigan State University , 578 South Shaw Lane, East Lansing, Michigan 48824-1322, United States.,Chemistry Department, Faculty of Science, Benha University , Benha, Qaliobiya 13518, Egypt
| | - Bo Yang
- Department of Chemistry, Michigan State University , 578 South Shaw Lane, East Lansing, Michigan 48824-1322, United States
| | - Keisuke Yoshida
- Department of Chemistry, Michigan State University , 578 South Shaw Lane, East Lansing, Michigan 48824-1322, United States
| | - Xuefei Huang
- Department of Chemistry, Michigan State University , 578 South Shaw Lane, East Lansing, Michigan 48824-1322, United States
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Concha N, Huang J, Bai X, Benowitz A, Brady P, Grady LC, Kryn LH, Holmes D, Ingraham K, Jin Q, Pothier Kaushansky L, McCloskey L, Messer JA, O’Keefe H, Patel A, Satz AL, Sinnamon RH, Schneck J, Skinner SR, Summerfield J, Taylor A, Taylor JD, Evindar G, Stavenger RA. Discovery and Characterization of a Class of Pyrazole Inhibitors of Bacterial Undecaprenyl Pyrophosphate Synthase. J Med Chem 2016; 59:7299-304. [DOI: 10.1021/acs.jmedchem.6b00746] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Nestor Concha
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Jianzhong Huang
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Xiaopeng Bai
- GlaxoSmithKline, 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Andrew Benowitz
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Pat Brady
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - LaShadric C. Grady
- GlaxoSmithKline, 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Luz Helena Kryn
- GlaxoSmithKline, 5 Moore Drive, Research Triangle Park, North Carolina 27009, United States
| | - David Holmes
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Karen Ingraham
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Qi Jin
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | | | - Lynn McCloskey
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Jeffrey A. Messer
- GlaxoSmithKline, 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Heather O’Keefe
- GlaxoSmithKline, 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Amish Patel
- GlaxoSmithKline, 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Alexander L. Satz
- GlaxoSmithKline, 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Robert H. Sinnamon
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Jessica Schneck
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Steve R. Skinner
- GlaxoSmithKline, 830 Winter Street, Waltham, Massachusetts 02451, United States
| | | | - Amy Taylor
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - J. David Taylor
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
| | - Ghotas Evindar
- GlaxoSmithKline, 830 Winter Street, Waltham, Massachusetts 02451, United States
| | - Robert A. Stavenger
- GlaxoSmithKline, 1250 S. Collegeville Road, Collegeville, Pennsylvania 19426, United States
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17
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Cherian PT, Deshpande A, Cheramie MN, Bruhn DF, Hurdle JG, Lee RE. Design, synthesis and microbiological evaluation of ampicillin-tetramic acid hybrid antibiotics. J Antibiot (Tokyo) 2016; 70:65-72. [PMID: 27189120 PMCID: PMC5116011 DOI: 10.1038/ja.2016.52] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 03/30/2016] [Accepted: 04/18/2016] [Indexed: 12/11/2022]
Abstract
Exploiting iron-uptake pathways by conjugating β-lactam antibiotics with iron-chelators such as catechol and hydroxamic acid is a proven strategy to overcome permeability-related resistance in Gram-negative bacteria. Since naturally occurring iron chelating tetramic acids have not been previously examined for this purpose, an exploratory series of novel ampicillin-tetramic acid hybrids that structurally resemble ureidopenicillins was designed and synthesized. The new analogs were evaluated for the ability to chelate iron and their MIC activities determined against a representative panel of clinically significant bacterial pathogens. The tetramic acid β-lactam hybrids demonstrated a high affinity to iron in the order of 10−30 M3. The hybrids were less active against Gram-positive bacteria. However, against Gram-negative bacteria, their activity was species dependent with several hybrids displaying improved activity over ampicillin against wild-type Pseudomonas aeruginosa. The anti-Gram-negative activities of the hybrids improved in the presence of clavulanic acid revealing that the tetramic acid moiety did not provide added protection against β-lactamases. Additionally, the hybrids were found to be efflux pump substrates as their activities markedly improved against pump-inactivated strains. Unlike the catechol and hydroxamic acid siderophore β-lactam conjugates, the activities of the hybrids did not improve under iron-deficient conditions. These results suggest that the tetramic acid hybrids gain permeability via different membrane receptors, or they are out competed by native bacterial siderophores with stronger affinities for iron. This study provides a foundation for the further exploitation of the tetramic acid moiety to achieve novel β-lactam anti-Gram-negative agents, providing that efflux and β-lactamase mediated resistance is addressed.
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Affiliation(s)
- Philip T Cherian
- Department of Chemical Biology and Therapeutics, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Aditi Deshpande
- Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX, USA
| | - Martin N Cheramie
- Department of Chemical Biology and Therapeutics, St Jude Children's Research Hospital, Memphis, TN, USA
| | - David F Bruhn
- Department of Chemical Biology and Therapeutics, St Jude Children's Research Hospital, Memphis, TN, USA
| | - Julian G Hurdle
- Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX, USA.,Department of Microbial and Molecular Pathogenesis, Texas A&M Health Science Center, College of Medicine, Bryan, TX, USA
| | - Richard E Lee
- Department of Chemical Biology and Therapeutics, St Jude Children's Research Hospital, Memphis, TN, USA
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18
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Dhavan AA, Ionescu AC, Kaduskar RD, Brambilla E, Dallavalle S, Varoni EM, Iriti M. Antibacterial and antifungal activities of 2,3-pyrrolidinedione derivatives against oral pathogens. Bioorg Med Chem Lett 2016; 26:1376-80. [DOI: 10.1016/j.bmcl.2016.01.082] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 01/28/2016] [Accepted: 01/29/2016] [Indexed: 10/22/2022]
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19
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Shalaby EM, Girgis AS, Farag H, Mabied AF, Fitch AN. Synthesis, X-ray powder diffraction and DFT calculations of vasorelaxant active 3-(arylmethylidene)pyrrolidine-2,5-diones. RSC Adv 2016. [DOI: 10.1039/c6ra24302a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Two 3-(arylmethylidene)pyrrolidine-2,5-diones, 12a and 12b, were synthesized and characterized by powder X-ray diffraction utilizing a high-resolution synchrotron X-ray powder technique as well as DFT calculations.
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Affiliation(s)
- ElSayed M. Shalaby
- European Synchrotron Radiation Facility
- 38043 Grenoble Cedex 9
- France
- X-Ray Crystallography Lab
- Physics Division
| | - Adel S. Girgis
- Pesticide Chemistry Department
- National Research Centre
- Dokki
- Egypt
| | - Hanaa Farag
- Pesticide Chemistry Department
- National Research Centre
- Dokki
- Egypt
| | - Ahmed F. Mabied
- X-Ray Crystallography Lab
- Physics Division
- National Research Centre
- Dokki
- Egypt
| | - Andrew N. Fitch
- European Synchrotron Radiation Facility
- 38043 Grenoble Cedex 9
- France
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20
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Cherian PT, Wu X, Yang L, Scarborough JS, Singh AP, Alam ZA, Lee RE, Hurdle JG. Gastrointestinal localization of metronidazole by a lactobacilli-inspired tetramic acid motif improves treatment outcomes in the hamster model of Clostridium difficile infection. J Antimicrob Chemother 2015; 70:3061-9. [PMID: 26286574 DOI: 10.1093/jac/dkv231] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 07/07/2015] [Indexed: 01/30/2023] Open
Abstract
OBJECTIVES Metronidazole, a mainstay treatment for Clostridium difficile infection (CDI), is often ineffective for severe CDI. Whilst this is thought to arise from suboptimal levels of metronidazole in the colon due to rapid absorption, empirical validation is lacking. In contrast, reutericyclin, an antibacterial tetramic acid from Lactobacillus reuteri, concentrates in the gastrointestinal tract. In this study, we modified metronidazole with reutericyclin's tetramic acid motif to obtain non-absorbed compounds, enabling assessment of the impact of pharmacokinetics on treatment outcomes. METHODS A series of metronidazole-bearing tetramic acid substituents were synthesized and evaluated in terms of anti-C. difficile activities, gastric permeability, in vivo pharmacokinetics, efficacy in the hamster model of CDI and mode of action. RESULTS Most compounds were absorbed less than metronidazole in cell-based Caco-2 permeability assays. In hamsters, lead compounds compartmentalized in the colon rather than the bloodstream with negligible levels detected in the blood, in direct contrast with metronidazole, which was rapidly absorbed into the blood and was undetectable in caecum. Accordingly, four leads were more efficacious (P < 0.05) than metronidazole in C. difficile-infected animals. Improved efficacy was not due to an alternative mode of action, as the leads retained the mode of action of metronidazole. CONCLUSIONS This study provides the clearest empirical evidence that the high absorption of metronidazole lowers treatment outcomes for CDI and suggests a role for the tetramic acid motif for colon-specific drug delivery. This approach also has the potential to lower systemic toxicity and drug interactions of nitroheterocyclic drugs for treating gastrointestine-specific diseases.
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Affiliation(s)
- Philip T Cherian
- Department of Chemical Biology and Therapeutics, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Xiaoqian Wu
- Department of Biology, University of Texas, Arlington, TX 76019, USA Center for Infectious and Inflammatory Diseases, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX 77030, USA
| | - Lei Yang
- Department of Chemical Biology and Therapeutics, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Jerrod S Scarborough
- Department of Chemical Biology and Therapeutics, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Aman P Singh
- Department of Chemical Biology and Therapeutics, St Jude Children's Research Hospital, Memphis, TN 38105, USA Biomedical Sciences Program, Graduate Health Sciences, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Zahidul A Alam
- Department of Biology, University of Texas, Arlington, TX 76019, USA
| | - Richard E Lee
- Department of Chemical Biology and Therapeutics, St Jude Children's Research Hospital, Memphis, TN 38105, USA
| | - Julian G Hurdle
- Department of Biology, University of Texas, Arlington, TX 76019, USA Center for Infectious and Inflammatory Diseases, Institute of Biosciences and Technology, Texas A&M Health Science Center, Houston, TX 77030, USA Department of Microbial and Molecular Pathogenesis, Texas A&M Health Science Center, College of Medicine, Bryan, TX 77807, USA
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21
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Healy AR, Izumikawa M, Slawin AMZ, Shin-ya K, Westwood NJ. Stereochemical assignment of the protein-protein interaction inhibitor JBIR-22 by total synthesis. Angew Chem Int Ed Engl 2015; 54:4046-50. [PMID: 25650886 PMCID: PMC4441253 DOI: 10.1002/anie.201411141] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Indexed: 12/04/2022]
Abstract
Recent reports have highlighted the biological activity associated with a subfamily of the tetramic acid class of natural products. Despite the fact that members of this subfamily act as protein-protein interaction inhibitors that are of relevance to proteasome assembly, no synthetic work has been reported. This may be due to the fact that this subfamily contains an unnatural 4,4-disubstitued glutamic acid, the synthesis of which provides a key challenge. A highly stereoselective route to a masked form of this unnatural amino acid now enabled the synthesis of two of the possible diastereomers of JBIR-22 and allowed the assignment of its relative and absolute stereochemistry.
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Affiliation(s)
- Alan R Healy
- School of Chemistry and Biomedical Sciences Research Complex, University of St Andrews and EaStCHEMNorth Haugh, St Andrews, Fife (UK)
| | - Miho Izumikawa
- Japan Biological Informatics Consortium (JBIC) 2-4-7 Aomi, Koto-kuTokyo 135-0064 (Japan)
| | - Alexandra M Z Slawin
- School of Chemistry and Biomedical Sciences Research Complex, University of St Andrews and EaStCHEMNorth Haugh, St Andrews, Fife (UK)
| | - Kazuo Shin-ya
- National Institute of Advanced Industrial Science and Technology (AIST)2-4-7 Aomi, Koto-ku, Tokyo 135-0064 (Japan)
| | - Nicholas J Westwood
- School of Chemistry and Biomedical Sciences Research Complex, University of St Andrews and EaStCHEMNorth Haugh, St Andrews, Fife (UK)
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22
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Healy AR, Izumikawa M, Slawin AMZ, Shin‐ya K, Westwood NJ. Stereochemical Assignment of the Protein-Protein Interaction Inhibitor JBIR-22 by Total Synthesis. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 127:4118-4122. [PMID: 27087707 PMCID: PMC4780591 DOI: 10.1002/ange.201411141] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Indexed: 11/06/2022]
Abstract
Recent reports have highlighted the biological activity associated with a subfamily of the tetramic acid class of natural products. Despite the fact that members of this subfamily act as protein-protein interaction inhibitors that are of relevance to proteasome assembly, no synthetic work has been reported. This may be due to the fact that this subfamily contains an unnatural 4,4-disubstitued glutamic acid, the synthesis of which provides a key challenge. A highly stereoselective route to a masked form of this unnatural amino acid now enabled the synthesis of two of the possible diastereomers of JBIR-22 and allowed the assignment of its relative and absolute stereochemistry.
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23
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Jeong YC, Moloney MG. Antibacterial barbituric acid analogues inspired from natural 3-acyltetramic acids; synthesis, tautomerism and structure and physicochemical property-antibacterial activity relationships. Molecules 2015; 20:3582-627. [PMID: 25710842 PMCID: PMC6272196 DOI: 10.3390/molecules20033582] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 02/05/2015] [Accepted: 02/12/2015] [Indexed: 12/13/2022] Open
Abstract
The synthesis, tautomerism and antibacterial activity of novel barbiturates is reported. In particular, 3-acyl and 3-carboxamidobarbiturates exhibited antibacterial activity, against susceptible and some resistant Gram-positive strains of particular interest is that these systems possess amenable molecular weight, rotatable bonds and number of proton-donors/acceptors for drug design as well as less lipophilic character, with physicochemical properties and ionic states that are similar to current antibiotic agents for oral and injectable use. Unfortunately, the reduction of plasma protein affinity by the barbituric core is not sufficient to achieve activity in vivo. Further optimization to reduce plasma protein affinity and/or elevate antibiotic potency is therefore required, but we believe that these systems offer unusual opportunities for antibiotic drug discovery.
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Affiliation(s)
- Yong-Chul Jeong
- Chemistry Research Laboratory, Mansfield Rd, University of Oxford, OX1 3TA, UK.
| | - Mark G Moloney
- Chemistry Research Laboratory, Mansfield Rd, University of Oxford, OX1 3TA, UK.
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24
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Yoshimura H, Takahashi K, Ishihara J, Hatakeyama S. Unified synthesis of tirandamycins and streptolydigins. Chem Commun (Camb) 2015; 51:17004-7. [PMID: 26448062 DOI: 10.1039/c5cc07749d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The comprehensive approach to tirandamycin and streptolydigin antibiotics has been developed utilizing a cinchona alkaloid-catalyzed asymmetric Morita–Baylis–Hillman reaction.
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Affiliation(s)
- Hikaru Yoshimura
- Graduate School of Biomedical Sciences
- Nagasaki University
- Nagasaki 852-8521
- Japan
| | | | - Jun Ishihara
- Graduate School of Biomedical Sciences
- Nagasaki University
- Nagasaki 852-8521
- Japan
| | - Susumi Hatakeyama
- Graduate School of Biomedical Sciences
- Nagasaki University
- Nagasaki 852-8521
- Japan
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25
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Xiang J, Yi N, Wang R, Lu L, Zou H, Pan Y, He W. Synthesis of β-ketophosphonates via AgNO3-catalyzed hydration of alkynylphosphonates: a rate-enhancement effect of methanol. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.12.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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26
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Jeong YC, Bikadi Z, Hazai E, Moloney MG. A Detailed Study of Antibacterial 3-Acyltetramic Acids and 3-Acylpiperidine-2,4-diones. ChemMedChem 2014; 9:1826-37. [DOI: 10.1002/cmdc.201402093] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Indexed: 12/12/2022]
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27
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Gold(I)-Catalyzed Hydration of Alkynylphosphonates: Efficient Access to β-Ketophosphonates. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400066] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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28
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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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29
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2011. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.05.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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31
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Tanimoto H, Kakiuchi K. Recent Applications and Developments of Organic Azides in Total Synthesis of Natural Products. Nat Prod Commun 2013. [DOI: 10.1177/1934578x1300800730] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Organic azides have been exploited since their discovery because of their high reactivities. Various organic reactions using azides have been synthetically applied in chemical biology pharmaceuticals medicinal and agricultural areas. In this review we present some recent applications and developments of organic azides in the total synthesis of natural products (mostly within five years) especially alkaloids. We focus not only on application examples of organic azides but also show their preparation methods including recently reported procedures concerning their decomposing and reducing methods in the syntheses of bioactive molecules.
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Affiliation(s)
- Hiroki Tanimoto
- Graduate School of Materials Science Nara Institute of Science and Technology (NAIST) 8916-5 Takayama-cho Ikoma Nara 630-0192 Japan
| | - Kiyomi Kakiuchi
- Graduate School of Materials Science Nara Institute of Science and Technology (NAIST) 8916-5 Takayama-cho Ikoma Nara 630-0192 Japan
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32
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Speer A, Rowland JL, Niederweis M. Mycobacterium tuberculosis is resistant to streptolydigin. Tuberculosis (Edinb) 2013; 93:401-4. [PMID: 23591156 DOI: 10.1016/j.tube.2013.03.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 03/11/2013] [Accepted: 03/13/2013] [Indexed: 11/26/2022]
Abstract
Drug resistant strains of Mycobacterium tuberculosis (Mtb) undermine tuberculosis (TB) control. Streptolydigin is a broadly effective antibiotic which inhibits RNA polymerase, similarly to rifampicin, a key drug in current TB chemotherapeutic regimens. Due to a vastly improved chemical synthesis streptolydigin and derivatives are being promoted as putative TB drugs. The microplate Alamar Blue assay revealed that Streptococcus salivarius and Mycobacterium smegmatis were susceptible to streptolydigin with minimum inhibitory concentrations (MICs) of 1.6 mg/L and 6.25 mg/L, respectively. By contrast, the MICs of streptolydigin and two derivatives, streptolydiginone and dihydrostreptolydigin, against Mtb were ≥ 100 mg/L demonstrating that Mtb is resistant to streptolydigin in contrast to previous reports. Further, a porin mutant of M. smegmatis is resistant to streptolydigin indicating that porins mediate uptake of streptolydigin across the outer membrane. Since the RNA polymerase is a validated drug target in Mtb and porins are required for susceptibility of M. smegmatis, the absence of MspA-like porins probably contributes to the resistance of Mtb to streptolydigin. This study shows that streptolydigin is not a suitable drug in TB treatment regimens.
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Affiliation(s)
- Alexander Speer
- Department of Microbiology, University of Alabama at Birmingham, 609 Bevill Biomedical Research Building, 845 19th Street South, Birmingham, AL 35294, USA
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33
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Prusov EV. Total synthesis of antibiotics: recent achievements, limitations, and perspectives. Appl Microbiol Biotechnol 2013; 97:2773-95. [DOI: 10.1007/s00253-013-4757-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 02/04/2013] [Accepted: 02/05/2013] [Indexed: 10/27/2022]
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34
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Jeong YC, Anwar M, Bikadi Z, Hazai E, Moloney MG. Natural product inspired antibacterial tetramic acid libraries with dual enzyme inhibition. Chem Sci 2013. [DOI: 10.1039/c2sc21713a] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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35
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Li X, Hu G, Luo P, Tang G, Gao Y, Xu P, Zhao Y. Palladium(II)‐Catalyzed Hydration of Alkynylphosphonates to β‐Ketophosphonates. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200420] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xiubin Li
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People's Republic of China, Fax: (+86)‐592‐218‐5780
| | - Gaobo Hu
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People's Republic of China, Fax: (+86)‐592‐218‐5780
| | - Ping Luo
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People's Republic of China, Fax: (+86)‐592‐218‐5780
| | - Guo Tang
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People's Republic of China, Fax: (+86)‐592‐218‐5780
| | - Yuxing Gao
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People's Republic of China, Fax: (+86)‐592‐218‐5780
| | - Pengxiang Xu
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People's Republic of China, Fax: (+86)‐592‐218‐5780
| | - Yufen Zhao
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People's Republic of China, Fax: (+86)‐592‐218‐5780
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry Tsinghua University, Beijing 100084, People's Republic of China
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(+)-Medioresinol leads to intracellular ROS accumulation and mitochondria-mediated apoptotic cell death in Candida albicans. Biochimie 2012; 94:1784-93. [DOI: 10.1016/j.biochi.2012.04.010] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 04/07/2012] [Indexed: 12/16/2022]
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37
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Bai WJ, Jackson SK, Pettus TRR. Mild Construction of 3-Methyl Tetramic Acids Enabling a Formal Synthesis of Palau’imide. Org Lett 2012; 14:3862-5. [DOI: 10.1021/ol301556a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wen-Ju Bai
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Stephen K. Jackson
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Thomas R. R. Pettus
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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Abstract
Tirandamycin C is a newly isolated member of the tetramic acid family natural products. We described herein the first enantioselective synthesis of natural (-)-tirandamycin C, the postulated biosynthetic precursor of other members of this family. The highly stereoselective (>15:1) mismatched double asymmetric γ-stannylcrotylboration reaction of aldehyde 8 with crotylborane reagent (R)-E-9 was utilized to access the key anti,anti-stereotriad 18.
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Affiliation(s)
- Ming Chen
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458
| | - William R. Roush
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458
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