1
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Shen B, Pan D, Xie W, Li XX, Yu S, Huang G, Li X. Rhodium-Catalyzed Enantioselective Formal [4+1] Cyclization of Benzyl Alcohols and Benzaldimines: Facile Access to Silicon-Stereogenic Heterocycles. Angew Chem Int Ed Engl 2024; 63:e202315230. [PMID: 37938113 DOI: 10.1002/anie.202315230] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/06/2023] [Accepted: 11/08/2023] [Indexed: 11/09/2023]
Abstract
The carbon-to-silicon switch in formation of bioactive sila-heterocycles with a silicon-stereogenic center has garnered significant interest in drug discovery. However, metal-catalyzed synthesis of such scaffolds is still in its infancy. Herein, a rhodium-catalyzed enantioselective formal [4+1] cyclization of benzyl alcohols and benzaldimines has been realized by enantioselective difunctionalization of a secondary silane reagent, affording chiral-at-silicon cyclic silyl ethers and sila-isoindolines, respectively. Mechanistic studies reveal a dual role of the rhodium-hydride catalyst. The coupling system proceeds via rhodium-catalyzed enantio-determining dehydrogenative OH silylation of the benzyl alcohol or hydrosilylation of the imine to give an enantioenriched silyl ether or silazane intermediate, respectively. The same rhodium catalyst also enables subsequent intramolecular cyclative C-H silylation directed by the pendent Si-H group. Experimental and DFT studies have been conducted to explore the mechanism of the OH bond silylation of benzyl alcohol, where the Si-O reductive elimination from a Rh(III) hydride intermediate has been established as the enantiodetermining step.
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Affiliation(s)
- Bingxue Shen
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, 266237, China
| | - Deng Pan
- Department of Chemistry, School of Science and Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin, 300072, China
| | - Wanying Xie
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, 266237, China
| | - Xiao-Xi Li
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, 266237, China
| | - Songjie Yu
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, 266237, China
| | - Genping Huang
- Department of Chemistry, School of Science and Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin, 300072, China
| | - Xingwei Li
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, 266237, China
- School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China
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2
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Synthesis, biological evaluation and structure-activity relationships of 5-arylidene tetramic acids with antibacterial activity against methicillin-resistant Staphylococcus aureus. Bioorg Med Chem Lett 2020; 30:127107. [PMID: 32216991 DOI: 10.1016/j.bmcl.2020.127107] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/09/2020] [Accepted: 03/10/2020] [Indexed: 01/27/2023]
Abstract
The steady rise of the antimicrobial resistance is a major global threat to human health that requires the urgent need for novel antibiotics. In this work we report the synthesis of a small library of 3-subsituted-5-arylidene tetramic acids in order to investigate the scope of our previously established methodology via an intermediate oxazolone and their antimicrobial activity. From this series of 14 tetramic acids, 11 derivatives are novel and one of them is a Schiff base, which was structurally characterized with single-crystal X-ray analysis and NMR spectroscopy. The compounds incorporating a lipophilic acyl group at carbon-3 of the ring showed moderate to high activity with minimum inhibitory activity of 4-32 μg/mL against methicillin-resistant Staphylococcus aureus (MRSA), accompanied by no human cell toxicity and hemolytic activity within the tested concentration range. The substituent at para position of the aryl ring seemed to have no or little effect on the antimicrobial activity of these compounds.
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3
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Oleksak P, Gonda J, Nepovimova E, Kuca K, Musilek K. The oxazolomycin family: a review of current knowledge. RSC Adv 2020; 10:40745-40794. [PMID: 35519217 PMCID: PMC9057759 DOI: 10.1039/d0ra08396h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 10/25/2020] [Indexed: 12/19/2022] Open
Abstract
Oxazolomycin A and neooxazolomycin were firstly isolated in 1985 by the group of Uemura et al. from the Streptomyces sp. bacteria.
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Affiliation(s)
- Patrik Oleksak
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
| | - Jozef Gonda
- Pavol Jozef Safarik University
- Faculty of Science
- Department of Organic Chemistry
- Kosice
- Slovak Republic
| | - Eugenie Nepovimova
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
| | - Kamil Kuca
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
| | - Kamil Musilek
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
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4
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Metal-Catalyzed and Metal-Mediated Approaches to the Synthesis and Functionalization of Tetramic Acids. Catalysts 2019. [DOI: 10.3390/catal9010050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The heterocyclic ring of tetramic acids is found in naturally occurred biologically active products isolated from fungi, bacteria, molds, and sponges. Thus, these molecules have attracted significant attention as synthetic targets, and various synthetic paths have been developed. Over recent years, a growing number of catalytic approaches toward functionalized products have been established in order to overcome the limitations of the conventional methods. The present review describes the strategies for the metal-catalyzed and metal-promoted synthesis and further derivatization of tetramic acids, with emphasis on recent examples from the literature.
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5
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Malik N, Iyamu ID, Scheidt KA, Schiltz GE. Synthesis of a novel fused pyrrolodiazepine-based library with anti-cancer activity. Tetrahedron Lett 2018; 59:1513-1516. [PMID: 29610541 DOI: 10.1016/j.tetlet.2018.03.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Development of drugs for new and persistent diseases will increasingly rely on the expansion of accessible chemical space to allow exploration of novel molecular targets. Here we report the synthesis of a library of novel fused heterobicyclic small molecules based on the 1,4-diazepine and 2,4-pyrrolidinedione scaffolds. Key chemical transformations included a Mannich-type condensation and chemoselective N-acylation reactions. Screening shows anti-cancer activity of several library compounds which suggests translational potential of this novel chemical scaffold.
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Affiliation(s)
- Neha Malik
- Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, Illinois, 60208, United States
| | - Iredia D Iyamu
- Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, Illinois, 60208, United States
| | - Karl A Scheidt
- Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, Illinois, 60208, United States.,Department of Chemistry, Northwestern University, Evanston, Illinois, 60208, United States.,Department of Pharmacology, Northwestern University, Chicago, Illinois 60611, United States.,Robert H. Lurie Comprehensive Cancer Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, United States
| | - Gary E Schiltz
- Center for Molecular Innovation and Drug Discovery, Northwestern University, Evanston, Illinois, 60208, United States.,Department of Pharmacology, Northwestern University, Chicago, Illinois 60611, United States.,Robert H. Lurie Comprehensive Cancer Center, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, United States
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6
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Josa-Culleré L, Towers C, Thompson AL, Moloney MG. Chemoselective Formation and Reaction of Densely Functionalised Bicyclic Tetramic Acids and Their Biological Activity. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701393] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Laia Josa-Culleré
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford United Kingdom
| | - Christopher Towers
- Department of Oncology; University of Oxford; Old Road Campus Research Building OX3 7LJ Oxford United Kingdom
| | - Amber L. Thompson
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford United Kingdom
| | - Mark G. Moloney
- Chemistry Research Laboratory; University of Oxford; 12 Mansfield Road OX1 3TA Oxford United Kingdom
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7
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Chen Y, Moloney JG, Christensen KE, Moloney MG. Fused-Ring Oxazolopyrrolopyridopyrimidine Systems with Gram-Negative Activity. Antibiotics (Basel) 2017; 6:antibiotics6010002. [PMID: 28098784 PMCID: PMC5372982 DOI: 10.3390/antibiotics6010002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 01/03/2017] [Accepted: 01/05/2017] [Indexed: 02/07/2023] Open
Abstract
Fused polyheterocyclic derivatives are available by annulation of a tetramate scaffold, and been shown to have antibacterial activity against a Gram-negative, but not a Gram-positive, bacterial strain. While the activity is not potent, these systems are structurally novel showing, in particular, a high level of polarity, and offer potential for the optimization of antibacterial activity.
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Affiliation(s)
- Yiyuan Chen
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
| | - Jonathan G Moloney
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
| | - Kirsten E Christensen
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
| | - Mark G Moloney
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
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8
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Tan SWB, Chai CLL, Moloney MG. Mimics of pramanicin derived from pyroglutamic acid and their antibacterial activity. Org Biomol Chem 2017; 15:1889-1912. [DOI: 10.1039/c6ob02828d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Mono and dihydroxypyrrolidinones are readily available by direct oxygenation of a pyroglutamate-derived bicyclic lactam with high diastereoselectivity, and these may be manipulated further in protected or unprotected form by Grignard addition to a pendant Weinreb amide to give acylhydroxypyrrolidinones.
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Affiliation(s)
- Song Wei Benjamin Tan
- Department of Chemistry
- Chemistry Research Laboratory
- The University of Oxford
- Oxford
- UK
| | - Christina L. L. Chai
- Institute of Chemical and Engineering Sciences (ICES)
- Singapore 138665
- Singapore
- Department of Pharmacy
- National University of Singapore
| | - Mark G. Moloney
- Department of Chemistry
- Chemistry Research Laboratory
- The University of Oxford
- Oxford
- UK
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9
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Sy-Cordero AA, Figueroa M, Raja HA, Meza Aviña ME, Croatt MP, Adcock AF, Kroll DJ, Wani MC, Pearce CJ, Oberlies NH. Spiroscytalin, a new tetramic acid and other metabolites of mixed biogenesis from Scytalidium cuboideum. Tetrahedron 2015; 71:8899-904. [PMID: 26525642 DOI: 10.1016/j.tet.2015.09.073] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Spiroscytalin (1), a new tetramic acid that possesses an uncommon spiro-ring fusion between a polyketide-derived octalin ring system and a 2,4-pyrrolidinedione, along with two known compounds, leporin B (2) and purpactin A (3), were isolated from a solid phase culture of the fungus Scytalidium cuboideum (MSX 68345). The molecular connectivity of 1-3 was determined using NMR spectroscopy and mass spectrometry. The relative configurations of 1 and 2 were determined by NOESY experiments. The absolute configuration of 1 was determined by electronic circular dichroism (ECD) via a combination of experimental measurements and computational calculations. While leporin B was known, it displayed activities that had not been reported previously, including cytotoxicity against three human tumor cell lines and antibacterial activity against Candida albicans and Staphylococcus aureus.
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Affiliation(s)
- Arlene A Sy-Cordero
- University of North Carolina at Greensboro, Department of Chemistry and Biochemistry, Greensboro, NC 27402, United States
| | - Mario Figueroa
- Facultad de Química, Universidad Nacional Autónoma de México, Mexico DF 04510, Mexico
| | - Huzefa A Raja
- University of North Carolina at Greensboro, Department of Chemistry and Biochemistry, Greensboro, NC 27402, United States
| | - Maria Elena Meza Aviña
- University of North Carolina at Greensboro, Department of Chemistry and Biochemistry, Greensboro, NC 27402, United States
| | - Mitchell P Croatt
- University of North Carolina at Greensboro, Department of Chemistry and Biochemistry, Greensboro, NC 27402, United States
| | - Audrey F Adcock
- Department of Pharmaceutical Sciences, BRITE, North Carolina Central University, Durham, NC 27707, United States
| | - David J Kroll
- Department of Pharmaceutical Sciences, BRITE, North Carolina Central University, Durham, NC 27707, United States
| | - Mansukh C Wani
- Natural Products Laboratory, Research Triangle Institute, Research Triangle Park, NC 27709, United States
| | | | - Nicholas H Oberlies
- University of North Carolina at Greensboro, Department of Chemistry and Biochemistry, Greensboro, NC 27402, United States
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10
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Krenk O, Kratochvíl J, Špulák M, Buchta V, Kuneš J, Nováková L, Ghavre M, Pour M. Methodology for Synthesis of Enantiopure 3,5-Disubstituted Pyrrol-2-ones. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500620] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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11
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Tan SWB, Chai CLL, Moloney MG, Thompson AL. Synthesis of Mimics of Pramanicin from Pyroglutamic Acid and Their Antibacterial Activity. J Org Chem 2015; 80:2661-75. [DOI: 10.1021/jo502810b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Song Wei Benjamin Tan
- Department
of Chemistry, Chemistry Research Laboratory, The University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
- Institute of Chemical
and Engineering Sciences (ICES), 8
Biomedical Grove, Neuros Building, #07-01/02/03, Singapore 138665
| | - Christina L. L. Chai
- Institute of Chemical
and Engineering Sciences (ICES), 8
Biomedical Grove, Neuros Building, #07-01/02/03, Singapore 138665
- Department
of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543
| | - Mark G. Moloney
- Department
of Chemistry, Chemistry Research Laboratory, The University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Amber L. Thompson
- Department
of Chemistry, Chemistry Research Laboratory, The University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
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12
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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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13
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Tan SWB, Chai CLL, Moloney MG. Synthesis of 3-acyltetramates by side chain manipulation and their antibacterial activity. Org Biomol Chem 2014; 12:1711-6. [PMID: 24514071 DOI: 10.1039/c4ob00095a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient approach for the introduction of 3-acyl side chain groups onto a core tetramate system, which are suitable for further manipulation by nucleophilic displacement or Horner-Wadsworth-Emmons coupling, provides access to a diverse library of substituted tetramates related to two distinct classes of natural products, equisetin and pramanicin. Assessment against S. aureus and E. coli indicated that some compounds exhibit significant antibacterial activity, providing unusual leads for further optimisation in the drug discovery process.
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Affiliation(s)
- Song Wei Benjamin Tan
- The Department of Chemistry, Chemistry Research Laboratory, The University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK.
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14
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Hofferberth ML, Brückner R. α‐ and β‐Lipomycin: Total Syntheses by Sequential Stille Couplings and Assignment of the Absolute Configuration of All Stereogenic Centers. Angew Chem Int Ed Engl 2014; 53:7328-34. [DOI: 10.1002/anie.201402255] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Indexed: 01/08/2023]
Affiliation(s)
- Max L. Hofferberth
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstrasse 21, 79104 Freiburg (Germany) http://www.brueckner.uni‐freiburg.de
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstrasse 21, 79104 Freiburg (Germany) http://www.brueckner.uni‐freiburg.de
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15
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Sengoku T, Suzuki K, Nakayama K, Yagishita F, Sakamoto M, Takahashi M, Yoda H. Novel chiral tetramic acid-derived diols: organocatalytic facile synthesis and unique structural properties. RSC Adv 2014. [DOI: 10.1039/c4ra05405a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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16
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Hofferberth ML, Brückner R. α‐ und β‐Lipomycin: Totalsynthesen auf der Grundlage sequentieller Stille‐Kupplungen und Zuordnung der absoluten Konfiguration aller stereogenen Zentren. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402255] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Max L. Hofferberth
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstraße 21, 79104 Freiburg (Deutschland) http://www.brueckner.uni‐freiburg.de
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert‐Ludwigs‐Universität Freiburg, Albertstraße 21, 79104 Freiburg (Deutschland) http://www.brueckner.uni‐freiburg.de
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17
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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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18
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Synthesis, antibiotic activity and structure–activity relationship study of some 3-enaminetetramic acids. Bioorg Med Chem Lett 2014; 24:1901-6. [DOI: 10.1016/j.bmcl.2014.03.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 03/05/2014] [Accepted: 03/06/2014] [Indexed: 01/31/2023]
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19
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Heaviside EA, Moloney MG, Thompson AL. Diastereoselective intramolecular aldol ring closures of threonine derivatives leading to densely functionalised pyroglutamates related to oxazolomycin. RSC Adv 2014. [DOI: 10.1039/c4ra01967a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Intramolecular aldol reactions on oxazolidine templates derived from threonine may be used to generate libraries of densely functionalised pyroglutamates with a high level of diastereoselectivity.
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Affiliation(s)
| | - Mark G. Moloney
- Department of Chemistry
- Chemistry Research Laboratory
- The University of Oxford
- Oxford, UK
| | - Amber L. Thompson
- Department of Chemistry
- Chemistry Research Laboratory
- The University of Oxford
- Oxford, UK
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20
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Xu Z, De Moliner F, Cappelli AP, Hulme C. Aldol reactions in multicomponent reaction based domino pathways: a multipurpose enabling tool in heterocyclic chemistry. Org Lett 2013; 15:2738-41. [PMID: 23718233 DOI: 10.1021/ol401068u] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The aldol reaction has been evaluated in combination with the Ugi multicomponent reaction to assemble richly decorated mono- and polycyclic systems via expeditious cascade pathways. A small collection of pyrrolinones was generated thereof, and the scarcely accessible pyridoquinoxalinedione scaffold was also prepared by designing an additional nucleophilic substitution step in this domino sequence requiring minimal operational effort.
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Affiliation(s)
- Zhigang Xu
- College of Pharmacy, BIO5 Oro Valley, The University of Arizona, Oro Valley, Arizona 85737, USA
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21
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Anwar M, Moloney MG. Chiral Bicyclic Tetramates as Non-Planar Templates for Chemical Library Synthesis. Chem Biol Drug Des 2013; 81:645-9. [DOI: 10.1111/cbdd.12110] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 01/15/2013] [Indexed: 11/26/2022]
Affiliation(s)
- Muhammad Anwar
- Department of Chemistry; Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road; Oxford; OX1 3TA; UK
| | - Mark G. Moloney
- Department of Chemistry; Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road; Oxford; OX1 3TA; UK
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22
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Angelov P, Chau YKS, Fryer PJ, Moloney MG, Thompson AL, Trippier PC. Biomimetic synthesis, antibacterial activity and structure-activity properties of the pyroglutamate core of oxazolomycin. Org Biomol Chem 2012; 10:3472-85. [PMID: 22437843 DOI: 10.1039/c2ob00042c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Biomimetic intramolecular aldol reactions on oxazolidine templates derived from serine may be used to generate densely functionalised pyroglutamates, which are simpler mimics of the right hand side of oxazolomycin. Some of the compounds from this sequence exhibit in vivo activity against S. aureus and E. coli, suggesting that pyroglutamate scaffolds may be useful templates for the development of novel antibacterials, and cheminformatic analysis has been used to provide some structure-activity data.
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Affiliation(s)
- Plamen Angelov
- Department of Chemistry, Chemistry Research Laboratory, The University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
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23
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Xu CP, Huang PQ, Py S. SmI2-Mediated Coupling of Nitrones and tert-Butanesulfinyl Imines with Allenoates: Synthesis of β-Methylenyl-γ-lactams and Tetramic Acids. Org Lett 2012; 14:2034-7. [DOI: 10.1021/ol300550x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chu-Pei Xu
- Département de Chimie Moléculaire (SERCO) UMR 5250, ICMG FR-2607, CNRS-Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 09, France, and Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Pei-Qiang Huang
- Département de Chimie Moléculaire (SERCO) UMR 5250, ICMG FR-2607, CNRS-Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 09, France, and Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Sandrine Py
- Département de Chimie Moléculaire (SERCO) UMR 5250, ICMG FR-2607, CNRS-Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 09, France, and Department of Chemistry and Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
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Jeong YC, Anwar M, Nguyen TM, Tan BSW, Chai CLL, Moloney MG. Control of chemoselectivity in Dieckmann ring closures leading to tetramic acids. Org Biomol Chem 2011; 9:6663-9. [DOI: 10.1039/c1ob05816a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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