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Kumar P, Kaur N, Kumar R, Banerjee P. α ,β-Unsaturated Carbonyls for One-Pot Transition-Metal-Free Access to 3,6-Dihydro-2 H-pyrans. J Org Chem 2022; 87:7167-7178. [PMID: 35579030 DOI: 10.1021/acs.joc.2c00379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient protocol has been developed for accessing mono-, di-, and trisubstituted 3,6-dihydro-2H-pyran derivatives by simply subjecting α,β-unsaturated carbonyls to the carefully optimized Corey-Chaykovsky reaction conditions. The strategy provides selectively substituted dihydropyran derivatives in good to excellent yields with a broad substrate scope under very mild reaction conditions. Easy transformation of the final 3,6-dihydro-2H-pyran to the valued 5,6-dihydro-2H-pyran-2-one and tetrahydro-2H-pyran derivatives expanded the scope of this methodology to diverse oxacycles. Further, the developed strategy also found application in a two-step route to racemic goniothalamin, which is widely studied for its cytotoxic behavior.
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Affiliation(s)
- Pankaj Kumar
- Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| | - Navpreet Kaur
- Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| | - Rakesh Kumar
- Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| | - Prabal Banerjee
- Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
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2
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Kostenko AA, Bykova KA, Kucherenko AS, Komogortsev AN, Lichitsky BV, Zlotin SG. 2-Nitroallyl carbonate-based green bifunctional reagents for catalytic asymmetric annulation reactions. Org Biomol Chem 2021; 19:1780-1786. [PMID: 33543186 DOI: 10.1039/d0ob02283g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
2-Nitroallylic carbonates, a new class of "green" 1,3-bielectrophilic reagents for organic synthesis and catalysis, have been prepared. The bifunctional tertiary amine-catalyzed asymmetric [3 + 3] annulations of cyclic enols with these reagents occur much faster than corresponding reactions with 2-nitroallylic esters and produce no acidic by-products poisoning the catalyst. Furthermore, 2-nitroallylic carbonates enable highly enantioselective one-pot synthesis of a variety of fused dihydropyrane derivatives from available precursors bearing pharmacophoric fragments.
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Affiliation(s)
- Alexey A Kostenko
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991, Moscow, Russian Federation.
| | - Kseniya A Bykova
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991, Moscow, Russian Federation.
| | - Alexander S Kucherenko
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991, Moscow, Russian Federation.
| | - Andrey N Komogortsev
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991, Moscow, Russian Federation.
| | - Boris V Lichitsky
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991, Moscow, Russian Federation.
| | - Sergei G Zlotin
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, 119991, Moscow, Russian Federation.
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3
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Lin S, Liu H, Svenningsen EB, Wollesen M, Jacobsen KM, Andersen FD, Moyano-Villameriel J, Pedersen CN, Nørby P, Tørring T, Poulsen TB. Expanding the antibacterial selectivity of polyether ionophore antibiotics through diversity-focused semisynthesis. Nat Chem 2020; 13:47-55. [PMID: 33353970 PMCID: PMC7610524 DOI: 10.1038/s41557-020-00601-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Accepted: 11/05/2020] [Indexed: 12/13/2022]
Abstract
Polyether ionophores are complex natural products capable of transporting cations across biological membranes. Many polyether ionophores possess potent antimicrobial activity and a few selected compounds have ability to target aggressive cancer cells. Nevertheless, ionophore function is believed to be associated with idiosyncratic cellu-lar toxicity and, consequently, human clinical development has not been pursued. Here, we demonstrate that structurally novel polyether ionophores can be efficiently constructed by recycling components of highly abundant polyethers to afford analogues with enhanced anti-bacterial selectivity compared to a panel of natural polyether ionophores. We used classic degradation reactions of the natural polyethers lasalocid and monensin and combined the resulting fragments with building blocks provided by total synthesis, including halogen-functionalized tetronic acids as cation-binding groups. Our results suggest that structural optimization of polyether ionophores is possible and that this area represents a potential opportunity for future methodological innovation.
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Affiliation(s)
- Shaoquan Lin
- Department of Chemistry, Aarhus University, Aarhus, Denmark
| | - Han Liu
- Department of Chemistry, Aarhus University, Aarhus, Denmark
| | | | | | | | - Frederikke D Andersen
- Department of Engineering-Microbial Biosynthesis, Aarhus University, Aarhus, Denmark
| | | | | | - Peter Nørby
- Department of Chemistry, Aarhus University, Aarhus, Denmark
| | - Thomas Tørring
- Department of Engineering-Microbial Biosynthesis, Aarhus University, Aarhus, Denmark
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Wang H, Sun T, Song W, Guo X, Cao P, Xu X, Shen Y, Zhao J. Taxonomic Characterization and Secondary Metabolite Analysis of NEAU-wh3-1: An Embleya Strain with Antitumor and Antibacterial Activity. Microorganisms 2020; 8:E441. [PMID: 32244993 PMCID: PMC7143961 DOI: 10.3390/microorganisms8030441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/17/2020] [Accepted: 03/18/2020] [Indexed: 01/29/2023] Open
Abstract
Cancer is a serious threat to human health. With the increasing resistance to known drugs, it is still urgent to find new drugs or pro-drugs with anti-tumor effects. Natural products produced by microorganisms have played an important role in the history of drug discovery, particularly in the anticancer and anti-infective areas. The plant rhizosphere ecosystem is a rich resource for the discovery of actinomycetes with potential applications in pharmaceutical science, especially Streptomyces. We screened Streptomyces-like strains from the rhizosphere soil of wheat (Triticum aestivum L.) in Hebei province, China, and thirty-nine strains were obtained. Among them, the extracts of 14 isolates inhibited the growth of colon tumor cell line HCT-116. Strain NEAU-wh-3-1 exhibited better inhibitory activity, and its active ingredients were further studied. Then, 16S rRNA gene sequence similarity studies showed that strain NEAU-wh3-1 with high sequence similarities to Embleya scabrispora DSM 41855T (99.65%), Embleya hyalina MB891-A1T (99.45%), and Streptomyces lasii 5H-CA11T (98.62%). Moreover, multilocus sequence analysis based on the five other house-keeping genes (atpD, gyrB, rpoB, recA, and trpB) and polyphasic taxonomic approach comprising chemotaxonomic, phylogenetic, morphological, and physiological characterization indicated that the isolate should be assigned to the genus Embleya and was different from its closely related strains, therefore, it is proposed that strain NEAU-wh3-1 may be classified as representatives of a novel species of the genus Embleya. Furthermore, active substances in the fermentation broth of strain NEAU-wh-3-1 were isolated by bioassay-guided analysis and identified by nuclear magnetic resonance (NMR) and mass spectrometry (MS) analyses. Consequently, one new Zincophorin analogue together with seven known compounds was detected. The new compound showed highest antitumor activity against three human cell lines with the 50% inhibition (IC50) values of 8.8-11.6 μg/mL and good antibacterial activity against four pathogenic bacteria, the other known compounds also exhibit certain biological activity.
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Affiliation(s)
- Han Wang
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China; (H.W.); (T.S.); (W.S.); (X.G.); (P.C.); (X.X.)
| | - Tianyu Sun
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China; (H.W.); (T.S.); (W.S.); (X.G.); (P.C.); (X.X.)
| | - Wenshuai Song
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China; (H.W.); (T.S.); (W.S.); (X.G.); (P.C.); (X.X.)
| | - Xiaowei Guo
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China; (H.W.); (T.S.); (W.S.); (X.G.); (P.C.); (X.X.)
| | - Peng Cao
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China; (H.W.); (T.S.); (W.S.); (X.G.); (P.C.); (X.X.)
| | - Xi Xu
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China; (H.W.); (T.S.); (W.S.); (X.G.); (P.C.); (X.X.)
| | - Yue Shen
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China; (H.W.); (T.S.); (W.S.); (X.G.); (P.C.); (X.X.)
- College of Science, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China
| | - Junwei Zhao
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 600 Changjiang Road, Xiangfang District, Harbin 150030, China; (H.W.); (T.S.); (W.S.); (X.G.); (P.C.); (X.X.)
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Liu H, Lin S, Jacobsen KM, Poulsen TB. Chemische Synthesen und chemische Biologie von Carboxylpolyether‐Ionophoren: Aktuelle Entwicklungen. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201812982] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Han Liu
- Department of ChemistryAarhus University Langelandsgade 140 8000 Aarhus C Dänemark
| | - Shaoquan Lin
- Department of ChemistryAarhus University Langelandsgade 140 8000 Aarhus C Dänemark
| | - Kristian M. Jacobsen
- Department of ChemistryAarhus University Langelandsgade 140 8000 Aarhus C Dänemark
| | - Thomas B. Poulsen
- Department of ChemistryAarhus University Langelandsgade 140 8000 Aarhus C Dänemark
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6
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Liu H, Lin S, Jacobsen KM, Poulsen TB. Chemical Syntheses and Chemical Biology of Carboxyl Polyether Ionophores: Recent Highlights. Angew Chem Int Ed Engl 2019; 58:13630-13642. [PMID: 30793459 DOI: 10.1002/anie.201812982] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Indexed: 12/21/2022]
Abstract
A central goal of chemical biology is to develop molecular probes that enable fundamental studies of cellular systems. In the hierarchy of bioactive molecules, the so-called ionophore class occupies an unflattering position in the lower branches, with typical labels being "non-specific" and "toxic". In fact, the mere possibility that a candidate molecule possesses "ionophore activity" typically prompts its removal from further studies; ionophores-from a chemical genetics perspective-are molecular outlaws. In stark contrast to this overall poor reputation of ionophores, synthetic chemistry owes some of its most amazing achievements to studies of ionophore natural products, in particular the carboxyl polyethers renowned for their intricate molecular structures. These compounds have for decades been academic battlegrounds where new synthetic methodology is tested and retrosynthetic tactics perfected. Herein, we review the most exciting recent advances in carboxyl polyether ionophore (CPI) synthesis and in addition discuss the burgeoning field of CPI chemical biology.
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Affiliation(s)
- Han Liu
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Shaoquan Lin
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Kristian M Jacobsen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Thomas B Poulsen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
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7
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Rigali S, Anderssen S, Naômé A, van Wezel GP. Cracking the regulatory code of biosynthetic gene clusters as a strategy for natural product discovery. Biochem Pharmacol 2018; 153:24-34. [DOI: 10.1016/j.bcp.2018.01.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 01/03/2018] [Indexed: 12/19/2022]
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8
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Li LL, Su YL, Han ZY, Gong LZ. Assembly of Tetrahydropyran Derivatives from Aldehydes, Allylboronates, and Syngas by Asymmetric Relay Catalytic Cascade Reaction. Chemistry 2018. [PMID: 29532578 DOI: 10.1002/chem.201801197] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
An efficient synthesis of highly enantio-enriched tetrahydropyrans from readily available aldehydes, allylboronates, and syngas has been established by multiply relay catalysis of rhodium and chiral phosphoric acid. The cascade reaction integrates the asymmetric allylboration of aldehydes and alkene hydroformylation, providing a structurally diverse range of products with different workup procedures. The concise synthesis of key chiral building blocks to access herboxidiene and leucascandrolide A demonstrates the high synthetic utility of this method. The cascade reaction employing alkenes to replace aldehydes was also successful.
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Affiliation(s)
- Lu-Lu Li
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Yong-Liang Su
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Zhi-Yong Han
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.,Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, China
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9
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Abstract
An overview of the highlights in total synthesis of natural products using iridium as a catalyst is given.
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Affiliation(s)
- Changchun Yuan
- School of Chemical Engineering and Technology
- North University of China
- Taiyuan 030051
- PR China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
- PR China
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10
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Chen LA, Ashley MA, Leighton JL. Evolution of an Efficient and Scalable Nine-Step (Longest Linear Sequence) Synthesis of Zincophorin Methyl Ester. J Am Chem Soc 2017; 139:4568-4573. [PMID: 28266852 DOI: 10.1021/jacs.7b01590] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Because of both their synthetically challenging and stereochemically complex structures and their wide range of often clinically relevant biological activities, nonaromatic polyketide natural products have for decades attracted an enormous amount of attention from synthetic chemists and played an important role in the development of modern asymmetric synthesis. Often, such compounds are not available in quantity from natural sources, rendering analogue synthesis and drug development efforts extremely resource-intensive and time-consuming. In this arena, the quest for ever more step-economical and efficient methods and strategies, useful and important goals in their own right, takes on added importance, and the most useful syntheses will combine high levels of step-economy with efficiency and scalability. The nonaromatic polyketide natural product zincophorin methyl ester has attracted significant attention from synthetic chemists due primarily to the historically synthetically challenging C(8)-C(12) all-anti stereopentad. While great progress has been made in the development of new methodologies to more directly address this problem and as a result in the development of more highly step-economical syntheses, a synthesis that combines high levels of step economy with high levels of efficiency and scalability has remained elusive. To address this problem, we have devised a new synthesis of zincophorin methyl ester that proceeds in just nine steps in the longest linear sequence and proceeds in 10% overall yield. Additionally, the scalability and practicability of the route have been demonstrated by performing all of the steps on a meaningful scale. This synthesis thus represents by a significant margin the most step-economical, efficient, and practicable synthesis of this stereochemically complex natural product reported to date, and is well suited to facilitate the synthesis of analogues and medicinal chemistry development efforts in a time- and resource-efficient manner.
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Affiliation(s)
- Liang-An Chen
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Melissa A Ashley
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - James L Leighton
- Department of Chemistry, Columbia University , New York, New York 10027, United States
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11
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Walther E, Boldt S, Kage H, Lauterbach T, Martin K, Roth M, Hertweck C, Sauerbrei A, Schmidtke M, Nett M. Zincophorin - biosynthesis in Streptomyces griseus and antibiotic properties. GMS Infect Dis 2016; 4:Doc08. [PMID: 30671322 PMCID: PMC6301713 DOI: 10.3205/id000026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Zincophorin is a polyketide antibiotic that possesses potent activity against Gram-positive bacteria, including human pathogens. While a number of total syntheses of this highly functionalized natural product were reported since its initial discovery, the genetic basis for the biosynthesis of zincophorin has remained unclear. In this study, the co-linearity inherent to polyketide pathways was used to identify the zincophorin biosynthesis gene cluster in the genome of the natural producer Streptomyces griseus HKI 0741. Interestingly, the same locus is fully conserved in the streptomycin-producing actinomycete S. griseus IFO 13350, suggesting that the latter bacterium is also capable of zincophorin biosynthesis. Biological profiling of zincophorin revealed a dose-dependent inhibition of the Gram-positive bacterium Streptococcus pneumoniae. The antibacterial effect, however, is accompanied by cytotoxicity. Antibiotic and cytotoxic activities were completely abolished upon esterification of the carboxylic acid group in zincophorin.
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Affiliation(s)
- Elisabeth Walther
- Jena University Hospital, Department of Virology and Antiviral Therapy, Jena, Germany
| | - Sabrina Boldt
- Department of Biomolecular Chemistry, Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute, Jena, Germany
| | - Hirokazu Kage
- Technical University Dortmund, Department of Biochemical and Chemical Engineering, Dortmund, Germany
| | - Tom Lauterbach
- Department of Biomolecular Chemistry, Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute, Jena, Germany
| | - Karin Martin
- Bio Pilot Plant, Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute, Jena, Germany
| | - Martin Roth
- Bio Pilot Plant, Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute, Jena, Germany
| | - Christian Hertweck
- Department of Biomolecular Chemistry, Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute, Jena, Germany
| | - Andreas Sauerbrei
- Jena University Hospital, Department of Virology and Antiviral Therapy, Jena, Germany
| | - Michaela Schmidtke
- Jena University Hospital, Department of Virology and Antiviral Therapy, Jena, Germany
| | - Markus Nett
- Technical University Dortmund, Department of Biochemical and Chemical Engineering, Dortmund, Germany
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12
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Kasun ZA, Gao X, Lipinski RM, Krische MJ. Direct Generation of Triketide Stereopolyads via Merged Redox-Construction Events: Total Synthesis of (+)-Zincophorin Methyl Ester. J Am Chem Soc 2015; 137:8900-3. [PMID: 26167950 PMCID: PMC4527649 DOI: 10.1021/jacs.5b05296] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
(+)-Zincophorin methyl ester is prepared in 13 steps (longest linear sequence). A bidirectional redox-triggered double anti-crotylation of 2-methyl-1,3-propane diol directly assembles the triketide stereopolyad spanning C4-C12, significantly enhancing step economy and enabling construction of (+)-zincophorin methyl ester in nearly half the steps previously required.
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Affiliation(s)
- Zachary A. Kasun
- University of Texas at Austin, Department of Chemistry, Austin, TX 78712, USA
| | - Xin Gao
- University of Texas at Austin, Department of Chemistry, Austin, TX 78712, USA
| | | | - Michael J. Krische
- University of Texas at Austin, Department of Chemistry, Austin, TX 78712, USA
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13
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Godin F, Mochirian P, St-Pierre G, Guindon Y. Total synthesis of zincophorin methyl ester. Stereocontrol of 1,2-induction using sterically hindered enoxysilanes. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.11.061] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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15
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Abstract
A key step in the synthesis of a C1-C11 fragment of the ionophore antibiotic Zincophorin involves the addition of an α-alkoxyalkylcopper(I) reagent to a planar chiral, neutral π-allyl iron complex. The key allylic alkylation reaction is highly regio- and stereoselective with addition taking place at the γ-position anti to the metal centre.
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Affiliation(s)
- John P Cooksey
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK.
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16
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Godin F, Prévost M, Gorelsky SI, Mochirian P, Nguyen M, Viens F, Guindon Y. Diastereoselective hydrogen-transfer reactions: an experimental and DFT study. Chemistry 2013; 19:9308-18. [PMID: 23733260 DOI: 10.1002/chem.201300377] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Indexed: 01/14/2023]
Abstract
Radical reductions of halogenated precursors bearing a heterocycle exo (α) to the carbon-centered radical proceed with enhanced anti-selectivity, a phenomenon that we termed "exocyclic effect". New experimental data and DFT calculations at the BHandHLYP/TZVP level demonstrate that the origin of the exocyclic effect is linked to the strain energy required for a radical intermediate to reach its reactive conformation at the transition state (ΔE(≠)(strain)). Furthermore, radical reductions of constrained THP systems indicate that high 2,3-anti inductions are reached only when the radical chain occupies an equatorial orientation. Hydride deliveries to different acyclic substrates and calculations also suggest that the higher anti-selectivities obtained with borinate intermediates are not related to the formation of a complex mimicking an exocycle. From a broader standpoint, this study reveals important conformational factors for reactions taking place at a center vicinal to a heterocycle or an α-alkoxy group.
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Affiliation(s)
- François Godin
- Département de Chimie, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec, H3C 3J7, Canada
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17
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Godin F, Prévost M, Viens F, Mochirian P, Brazeau JF, Gorelsky SI, Guindon Y. A Study of Exocyclic Radical Reductions of Polysubstituted Tetrahydropyrans. J Org Chem 2013; 78:6075-103. [DOI: 10.1021/jo400721e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- François Godin
- Institut de recherches cliniques de Montréal (IRCM), Bio-Organic Chemistry
Laboratory, 110 avenue des Pins Ouest, Montréal, Québec,
Canada H2W 1R7
- Département
de Chimie, Université de Montréal, C.P. 6128, succursale
Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - Michel Prévost
- Institut de recherches cliniques de Montréal (IRCM), Bio-Organic Chemistry
Laboratory, 110 avenue des Pins Ouest, Montréal, Québec,
Canada H2W 1R7
- Département
de Chimie, Université de Montréal, C.P. 6128, succursale
Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - Frédérick Viens
- Institut de recherches cliniques de Montréal (IRCM), Bio-Organic Chemistry
Laboratory, 110 avenue des Pins Ouest, Montréal, Québec,
Canada H2W 1R7
- Département
de Chimie, Université de Montréal, C.P. 6128, succursale
Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - Philippe Mochirian
- Institut de recherches cliniques de Montréal (IRCM), Bio-Organic Chemistry
Laboratory, 110 avenue des Pins Ouest, Montréal, Québec,
Canada H2W 1R7
- Département
de Chimie, Université de Montréal, C.P. 6128, succursale
Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - Jean-François Brazeau
- Institut de recherches cliniques de Montréal (IRCM), Bio-Organic Chemistry
Laboratory, 110 avenue des Pins Ouest, Montréal, Québec,
Canada H2W 1R7
- Département
de Chimie, Université de Montréal, C.P. 6128, succursale
Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - Serge I. Gorelsky
- Department of Chemistry and
Center for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, Canada K1N
6N5
| | - Yvan Guindon
- Institut de recherches cliniques de Montréal (IRCM), Bio-Organic Chemistry
Laboratory, 110 avenue des Pins Ouest, Montréal, Québec,
Canada H2W 1R7
- Département
de Chimie, Université de Montréal, C.P. 6128, succursale
Centre-ville, Montréal, Québec, Canada H3C 3J7
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal,
Québec, Canada H3A 2K6
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18
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Chen M, Roush WR. Highly stereoselective synthesis of anti,anti-dipropionate stereotriads: a solution to the long-standing problem of challenging mismatched double asymmetric crotylboration reactions. J Am Chem Soc 2012; 134:3925-31. [PMID: 22332989 DOI: 10.1021/ja300472a] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereocontrolled synthesis of the β-branched anti,anti-dipropionate stereotriad 4 via aldol or crotylmetal chemistry represents a historical challenge to the organic synthesis community. Here we describe a general solution to the long-standing problem associated with the synthesis of 4 by utilizing mismatched double asymmetric crotylboration reactions of enantioenriched α-methyl substituted aldehydes with the chiral, nonracemic crotylborane reagent (S)-(E)-22 (or its enantiomer). This method not only provides direct access to anti,anti-dipropionate stereotriads 24 [a synthetic equivalent of 4] with very good (5-8:1) if not excellent (≥15:1) diastereoselectivity from β-branched chiral aldehydes with ≤50:1 intrinsic diastereofacial selectivity preferences but also provides a vinylstannane unit in the products that is properly functionalized for use in subsequent C-C bond-forming events. We anticipate that this method will be widely applicable and will lead to substantial simplification of strategies for synthesis of polyketide natural products.
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Affiliation(s)
- Ming Chen
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, USA
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19
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Mochirian P, Godin F, Katsoulis I, Fontaine I, Brazeau JF, Guindon Y. A Bidirectional Approach to the Synthesis of Polypropionates: Synthesis of C1–C13 Fragment of Zincophorin and Related Isomers. J Org Chem 2011; 76:7654-76. [DOI: 10.1021/jo2013884] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Philippe Mochirian
- (IRCM), Bio-organic Chemistry Laboratory, Institut de Recherches Cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7
- Département de Chimie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - François Godin
- (IRCM), Bio-organic Chemistry Laboratory, Institut de Recherches Cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7
- Département de Chimie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - Ioannis Katsoulis
- NCSR “Demokritos”, Institute of Physical Chemistry, Agia Paraskevi, GR 15310, Greece
| | - Isabelle Fontaine
- (IRCM), Bio-organic Chemistry Laboratory, Institut de Recherches Cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7
- Département de Chimie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7
| | - Jean-François Brazeau
- Department of Chemistry, University of California, 619 Latimer Hall, Berkeley, California, 94720, United States
| | - Yvan Guindon
- (IRCM), Bio-organic Chemistry Laboratory, Institut de Recherches Cliniques de Montréal, 110 Avenue des Pins Ouest, Montréal, Québec, Canada H2W 1R7
- Département de Chimie, Université de Montréal, C.P. 6128, succursale Centre-ville, Montréal, Québec, Canada H3C 3J7
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec, Canada, H3A 2K6
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20
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Harrison TJ, Ho S, Leighton JL. Toward more "ideal" polyketide natural product synthesis: a step-economical synthesis of zincophorin methyl ester. J Am Chem Soc 2011; 133:7308-11. [PMID: 21524078 PMCID: PMC3092851 DOI: 10.1021/ja201467z] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly efficient and step-economical synthesis of zincophorin methyl ester has been achieved. The unprecedented step economy of this zincophorin synthesis is principally due to an application of the tandem silylformylation-crotylsilylation/Tamao oxidation-diastereoselective tautomerization reaction, which achieves in a single step what would typically require a significant multistep sequence.
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Affiliation(s)
- Tyler J Harrison
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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