1
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Johny M, Rajendar G. Effective In Situ Alkoxide Trapping by TMSX in the Presence of TPP Catalyst in Glycidol Acetal Rearrangements. J Org Chem 2024; 89:7036-7046. [PMID: 38716502 DOI: 10.1021/acs.joc.4c00408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
This study demonstrates a nucleophile-catalyzed, trimethylsilyl halide-promoted rearrangement reaction of glycidol acetals to form halogenated cyclic acetals. The acetal group has been activated selectively in the presence of trimethylsilyl cation, which is used as in situ-generated alkoxide trapping reagent. Nucleophilic chloride and bromide ions participate in addition reactions with epoxides predominantly via SN1-type epoxide opening, while non-nucleophilic iodide and triflate ions induce a positive charge at the epoxide carbon. A systematic investigation of acetal-initiated polyene cyclization of epoxy polyenes has been conducted using bicyclic epoxonium ions as transient intermediates. Unfavorable orbital orientation and other stereoelectronic factors hinder the much-anticipated polyene cyclizations. The potential of this method has been showcased through its application in the total synthesis of parvistone A, a chlorinated styryllactone.
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Affiliation(s)
- Meera Johny
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala 695551, India
| | - Goreti Rajendar
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala 695551, India
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2
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Hanif M, Zahoor AF, Saif MJ, Nazeer U, Ali KG, Parveen B, Mansha A, Chaudhry AR, Irfan A. Exploring the synthetic potential of epoxide ring opening reactions toward the synthesis of alkaloids and terpenoids: a review. RSC Adv 2024; 14:13100-13128. [PMID: 38655462 PMCID: PMC11036177 DOI: 10.1039/d4ra01834f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Accepted: 04/15/2024] [Indexed: 04/26/2024] Open
Abstract
Epoxides are oxygen containing heterocycles which are significantly employed as crucial intermediates in various organic transformations. They are considered highly reactive three-membered heterocycles due to ring strain and they undergo epoxide ring opening reactions with diverse range of nucleophiles. Epoxide ring-opening reactions have gained prominence as flexible and effective means to obtain various functionalized molecules. These reactions have garnered substantial attention in organic synthesis, driven by the need to comprehend the synthesis of biologically and structurally important organic compounds. They have also found applications in the synthesis of complex natural products. In this review article, we have summarized the implementation of epoxide ring opening reactions in the synthesis of alkaloids and terpenoids based natural products reported within the last decade (2014-2023).
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Affiliation(s)
- Madiha Hanif
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Ameer Fawad Zahoor
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Muhammad Jawwad Saif
- Department of Applied Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Usman Nazeer
- Department of Chemistry, University of Houston 3585 Cullen Boulevard Texas 77204-5003 USA
| | - Kulsoom Ghulam Ali
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Bushra Parveen
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Asim Mansha
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Aijaz Rasool Chaudhry
- Department of Physics, College of Science, University of Bisha P.O. Box 551 Bisha 61922 Saudi Arabia
| | - Ahmad Irfan
- Department of Chemistry, King Khalid University P.O. Box 9004 Abha 61413 Saudi Arabia
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3
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Wu K, Kang K, Liu D, Zhang C, Wang X, Zhang M, Li Q. Gold-catalyzed endo-selective Ring-opening of Epoxides and its Application in Construction of Poly-ethers. Chemistry 2024; 30:e202400234. [PMID: 38273816 DOI: 10.1002/chem.202400234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Accepted: 01/23/2024] [Indexed: 01/27/2024]
Abstract
Tetrahydropyran and tetrahydropyran-fused poly-ethers scaffolds are found in many classes of natural products and medicinally relevant small molecules. Here we describe a catalytic system for 6-endo selective ring-opening of epoxides by Au(I) or Au(III) catalyst that provides rapid access to various tetrahydropyran-derived motifs. It also could efficiently construct the subunits of marine ladder-like poly-ethers through emulating the Nakanishi's hypothesis on the biosynthesis of these toxins. The synthetic utility of this method is also demonstrated in the preparation of the tricyclic core of tetrahydropyran-containing macrolide natural products lituarines A-C.
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Affiliation(s)
- Kehuan Wu
- Small-Molecule Drug Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai, 201203, China
| | - Kaiwen Kang
- Small-Molecule Drug Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai, 201203, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Dan Liu
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Chiyue Zhang
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Xinyu Wang
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Miaocheng Zhang
- Small-Molecule Drug Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai, 201203, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qi Li
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing, 210023, China
- Small-Molecule Drug Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai, 201203, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
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4
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Ma W, Kirchhoff JL, Strohmann C, Grabe B, Loh CCJ. Cooperative Bifurcated Chalcogen Bonding and Hydrogen Bonding as Stereocontrolling Elements for Selective Strain-Release Septanosylation. J Am Chem Soc 2023; 145:26611-26622. [PMID: 38032866 PMCID: PMC10722516 DOI: 10.1021/jacs.3c06984] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 11/08/2023] [Accepted: 11/08/2023] [Indexed: 12/02/2023]
Abstract
The exploitation of noncovalent interactions (NCIs) is emerging as a vital handle in tackling broad stereoselectivity challenges in synthesis. In particular, there has been significant recent interest in the harnessing of unconventional NCIs to surmount difficult selectivity challenges in glycosylations. Herein, we disclose the exploitation of an unconventional bifurcated chalcogen bonding and hydrogen bonding (HB) network, which paves the way for a robust catalytic strategy into biologically useful seven-membered ring sugars. Through 13C nuclear magnetic resonance (NMR) in situ monitoring, NMR titration experiments, and density functional theory (DFT) modeling, we propose a remarkable contemporaneous activation of multiple functional groups consisting of a bifurcated chalcogen bonding mechanism working hand-in-hand with HB activation. Significantly, the ester moiety installed on the glycosyl donor is critical in the establishment of the postulated ternary complex for stereocontrol. Through the 13C kinetic isotopic effect and kinetic studies, our data corroborated that a dissociative SNi-type mechanism forms the stereocontrolling basis for the excellent α-selectivity.
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Affiliation(s)
- Wenpeng Ma
- Abteilung
Chemische Biologie, Max-Planck-Institut
für Molekulare Physiologie, Otto-Hahn-Straße 11, Dortmund 44227, Germany
- Fakultät
für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 4a, Dortmund 44227, Germany
| | - Jan-Lukas Kirchhoff
- Fakultät
für Chemie und Chemische Biologie, Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Straße 6, Dortmund 44227, Germany
| | - Carsten Strohmann
- Fakultät
für Chemie und Chemische Biologie, Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Straße 6, Dortmund 44227, Germany
| | - Bastian Grabe
- Fakultät
für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 4a, Dortmund 44227, Germany
| | - Charles C. J. Loh
- Abteilung
Chemische Biologie, Max-Planck-Institut
für Molekulare Physiologie, Otto-Hahn-Straße 11, Dortmund 44227, Germany
- Fakultät
für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 4a, Dortmund 44227, Germany
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5
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Nishikawa K, Teranishi T, Tsuruta T, Niwa T, Morita K, Hashimoto S, Hoshino A, Kumagai M, Morimoto Y. Establishment of "Ring-Size-Divergent" Synthetic Strategy: Divergent Synthesis, Stereochemical Assignments, and Biological Activity Studies of Nerolidol-Type Sesquiterpenoids and Feroniellins. J Org Chem 2023; 88:15844-15861. [PMID: 37924303 DOI: 10.1021/acs.joc.3c01913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2023]
Abstract
Biomimetic epoxide-opening cascade cyclizations of polyepoxides enable the efficient and rapid construction of polyether skeletons. In this study, we discovered a method for switching the cyclization mode from tetrahydrofuran to tetrahydropyran (THP) formation in epoxide-opening cascades of polyepoxides. The THP formation proceeded via an epoxonium-ion intermediate by simple heating in neutral water. Next, by expanding the switching reaction, we successfully established a "ring-size-divergent" synthetic strategy that enabled the synthesis of the five-, six-, and seven-membered ether rings from identical diepoxide cyclization precursors under simple acidic or neutral conditions. The "ring-size-divergent" synthetic strategy was applied to the short divergent synthesis of nerolidol-type sesquiterpenoids and feroniellins, resulting in the revision of the proposed stereochemistry of certain natural products and the determination of all of the absolute configurations. Additionally, the anti-inflammatory activities of the synthetic samples were evaluated.
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Affiliation(s)
- Keisuke Nishikawa
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Tomonori Teranishi
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Tomoki Tsuruta
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Toshiki Niwa
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Kengo Morita
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Subaru Hashimoto
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Akihiro Hoshino
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Momochika Kumagai
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
- Faculty of Fisheries, Kagoshima University, Shimoarata, Kagoshima 890-0056, Japan
| | - Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Sumiyoshi-ku, Osaka 558-8585, Japan
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6
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Theoretical Study on the Origin of Abnormal Regioselectivity in Ring-Opening Reaction of Hexafluoropropylene Oxide. Molecules 2023; 28:molecules28041669. [PMID: 36838653 PMCID: PMC9962681 DOI: 10.3390/molecules28041669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 01/19/2023] [Accepted: 02/01/2023] [Indexed: 02/12/2023] Open
Abstract
That nucleophiles preferentially attack at the less sterically hindered carbon of epoxides under neutral and basic conditions has been generally accepted as a fundamental rule for predicting the regioselectivity of this type of reaction. However, this rule does not hold for perfluorinated epoxides, such as hexafluoropropylene oxide (HFPO), in which nucleophiles were found to attack at the more hindered CF3 substituted β-C rather than the fluorine substituted α-C. In this contribution, we aim to shed light on the nature of this intriguing regioselectivity by density functional theory methods. Our calculations well reproduced the observed abnormal regioselectivities and revealed that the unusual regiochemical preference for the sterically hindered β-C of HFPO mainly arises from the lower destabilizing distortion energy needed to reach the corresponding ring-opening transition state. The higher distortion energy required for the attack of the less sterically hindered α-C results from a significant strengthening of the C(α)-O bond by the negative hyperconjugation between the lone pair of epoxide O atom and the antibonding C-F orbital.
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7
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Johny M, Philip RM, Rajendar G. Highly Regio- and Stereoselective Intramolecular Rearrangement of Glycidol Acetal to Alkoxy Cyclic Acetals. Org Lett 2022; 24:6165-6170. [PMID: 35960602 DOI: 10.1021/acs.orglett.2c02397] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new class of highly regio- and stereoselective intramolecular rearrangements of glycidol acetals to produce alkoxylated 1,3-dioxolane/1,3-dioxane is demonstrated. Selective Lewis acid activation of acetal generates an oxocarbenium ion that initiates the epoxide ring-opening event, giving the bicyclic [3,1,0]epoxonium ion intermediate that undergoes exo/endo-selective opening by a tethered alkoxide. Mechanistic insights into preferential acetal activation over the epoxide were obtained by crossover experiments. The method was applied in the total synthesis of parvistone B and its 8-ethoxy analogue.
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Affiliation(s)
- Meera Johny
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, India 695551
| | - Rose Mary Philip
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, India 695551
| | - Goreti Rajendar
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, India 695551
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8
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Dembitsky VM. Natural Polyether Ionophores and Their Pharmacological Profile. Mar Drugs 2022; 20:292. [PMID: 35621943 PMCID: PMC9144361 DOI: 10.3390/md20050292] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 04/18/2022] [Accepted: 04/20/2022] [Indexed: 02/04/2023] Open
Abstract
This review is devoted to the study of the biological activity of polyether ionophores produced by bacteria, unicellular marine algae, red seaweeds, marine sponges, and coelenterates. Biological activities have been studied experimentally in various laboratories, as well as data obtained using QSAR (Quantitative Structure-Activity Relationships) algorithms. According to the data obtained, it was shown that polyether toxins exhibit strong antibacterial, antimicrobial, antifungal, antitumor, and other activities. Along with this, it was found that natural polyether ionophores exhibit such properties as antiparasitic, antiprotozoal, cytostatic, anti-mycoplasmal, and antieczema activities. In addition, polyethers have been found to be potential regulators of lipid metabolism or inhibitors of DNA synthesis. Further study of the mechanisms of action and the search for new polyether ionophores and their derivatives may provide more effective therapeutic natural polyether ionophores for the treatment of cancer and other diseases. For some polyether ionophores, 3D graphs are presented, which demonstrate the predicted and calculated activities. The data presented in this review will be of interest to pharmacologists, chemists, practical medicine, and the pharmaceutical industry.
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Affiliation(s)
- Valery M Dembitsky
- Centre for Applied Research, Innovation and Entrepreneurship, Lethbridge College, 3000 College Drive South, Lethbridge, AB T1K 1L6, Canada
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9
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Qiao C, Villar-Yanez A, Garay-Ruiz D, Buchholz JB, Bo C, Kleij AW. Domino Synthesis of Bicyclic 3,5-Anhydro Furanose Mimics Using a Binary Al(III) Complex/Halide Catalyst. ACS Catal 2022. [DOI: 10.1021/acscatal.2c00925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chang Qiao
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
- Universitat Rovira i Virgili (URV), Marcel·lí Domingo s/n, 43007 Tarragona, Spain
- Departament de Química Física i Inorgánica, Universitat Rovira i Virgili (URV), Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Alba Villar-Yanez
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
- Universitat Rovira i Virgili (URV), Marcel·lí Domingo s/n, 43007 Tarragona, Spain
- Departament de Química Física i Inorgánica, Universitat Rovira i Virgili (URV), Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Diego Garay-Ruiz
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
- Universitat Rovira i Virgili (URV), Marcel·lí Domingo s/n, 43007 Tarragona, Spain
- Departament de Química Física i Inorgánica, Universitat Rovira i Virgili (URV), Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Jordi-Benet Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Carles Bo
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
- Universitat Rovira i Virgili (URV), Marcel·lí Domingo s/n, 43007 Tarragona, Spain
- Departament de Química Física i Inorgánica, Universitat Rovira i Virgili (URV), Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Arjan W. Kleij
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
- Catalan Institute of Research and Advanced Studies (ICREA), Pg. Lluís Companys 23, 08010 Barcelona, Spain
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10
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Construction of Benzo‐Fused Heterocycles by Epoxide–Heteronucleophile Cyclization: Applications in the Synthesis of Natural Products and Designed Molecules. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Bowen JI, Wang L, Crump MP, Willis CL. Synthetic and biosynthetic methods for selective cyclisations of 4,5-epoxy alcohols to tetrahydropyrans. Org Biomol Chem 2022; 20:1150-1175. [PMID: 35029626 PMCID: PMC8827043 DOI: 10.1039/d1ob01905h] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Tetrahydropyrans (THPs) are common structural motifs found in natural products and synthetic therapeutic molecules. In Nature these 6-membered oxygen heterocycles are often assembled via intramolecular reactions involving either oxy-Michael additions or ring opening of epoxy-alcohols. Indeed, the polyether natural products have been particularly widely studied due to their fascinating structures and important biological properties; these are commonly formed via endo-selective epoxide-opening cascades. In this review we outline synthetic approaches for endo-selective intramolecular epoxide ring opening (IERO) of 4,5-epoxy-alcohols and their applications in natural product synthesis. In addition, the biosynthesis of THP-containing natural products which utilise IERO reactions are reviewed. In this review, methods for the selective intramolecular epoxide ring opening (IERO) of 4,5-epoxy-alcohols are discussed as well as biosynthetic pathways to tetrahydropyran-containing natural products which utilise IERO reactions.![]()
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Affiliation(s)
- James I Bowen
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Luoyi Wang
- CAS Key Laboratory of Microbial Physiological and Metabolic Engineering, State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Matthew P Crump
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Christine L Willis
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
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12
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Mulamreddy R, Lubell WD. Constrained Dipeptide Surrogates: 5- and 7-Hydroxy Indolizidin-2-one Amino Acid Synthesis from Iodolactonization of Dehydro-2,8-diamino Azelates. Molecules 2021; 27:molecules27010067. [PMID: 35011297 PMCID: PMC8746717 DOI: 10.3390/molecules27010067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 12/15/2021] [Accepted: 12/17/2021] [Indexed: 11/16/2022] Open
Abstract
The constrained dipeptide surrogates 5- and 7-hydroxy indolizidin-2-one N-(Boc)amino acids have been synthesized from L-serine as a chiral educt. A linear precursor ∆4-unsaturated (2S,8S)-2,8-bis[N-(Boc)amino]azelic acid was prepared in five steps from L-serine. Although epoxidation and dihydroxylation pathways gave mixtures of hydroxy indolizidin-2-one diastereomers, iodolactonization of the ∆4-azelate stereoselectively delivered a lactone iodide from which separable (5S)- and (7S)-hydroxy indolizidin-2-one N-(Boc)amino esters were synthesized by sequences featuring intramolecular iodide displacement and lactam formation. X-ray analysis of the (7S)-hydroxy indolizidin-2-one N-(Boc)amino ester indicated that the backbone dihedral angles embedded in the bicyclic ring system resembled those of the central residues of an ideal type II’ β-turn indicating the potential for peptide mimicry.
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13
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Kim ST, Park Y, Kim N, Gu J, Son W, Hur J, Lee K, Baek A, Song JY, Kim UB, Lee KY, Oh CY, Park S, Shin H. Synthesis of the C1–C13 Fragment of Eribulin on a Kilogram Scale. Org Process Res Dev 2021. [DOI: 10.1021/acs.oprd.1c00295] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Seong Taek Kim
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Yongseo Park
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Namhyeon Kim
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Jaeun Gu
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Wongyoung Son
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Jisu Hur
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - KangHee Lee
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Areum Baek
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Ju Young Song
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - U Bin Kim
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Kee-Young Lee
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Chang-Young Oh
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Seokhwi Park
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
| | - Hyunik Shin
- R&D Center, Yonsung Fine Chemicals Company Limited, Innoplex-2-dong, 306, Sinwon-ro, Yeongtong-gu, Suwon-si 16675, Gyeonggi-do, Republic of Korea
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14
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Influence of the Substituents on the Opening of Silylepoxy Alcohols: 5- exo-Cyclization towards Tetrahydrofurans vs. Unexpected Side Reaction Leading to Tetrahydropyrans. Molecules 2021; 26:molecules26237386. [PMID: 34885968 PMCID: PMC8658919 DOI: 10.3390/molecules26237386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 11/30/2021] [Accepted: 12/01/2021] [Indexed: 11/21/2022] Open
Abstract
The regioselective ring opening of epoxy alcohols is an effective method for the synthesis of different types of oxacycles. The 5-exo opening being preferred vs. the 6-endo mode, according to Baldwin rules, the use of silyl-substituted oxiranes has been reported as a possible method to favor the 6-endo cyclization. However, there is a need for a detailed study on the different factors (structural factors, catalyst nature or conditions) that influence this process. In this paper, the acid-catalyzed cyclization of epoxysilyl alcohols was studied, focusing on the effect of substituents and reaction conditions on the outcome of the process. Two types of heterocycles (tetrahydrofurans or tetrahydropyrans) were selectively obtained depending on the structure of the initial epoxysilyl alcohol. Interestingly, cyclization of hindered epoxysilyl alcohols mainly proceeds through an unexpected side reaction, which implies a previous isomerization to an aldehyde. A mechanistic proposal for the formation of the different products is presented.
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15
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Tanaka K, Kobayashi K, Kogen H. Enantioselective total synthesis of (+)-rubrobramide, (+)-talaramide A, and (-)-berkeleyamide D by a skeletal diversification strategy. Chem Commun (Camb) 2021; 57:9780-9783. [PMID: 34486624 DOI: 10.1039/d1cc04290d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A unified synthesis of (+)-rubrobramide, (+)-talaramide A, and (-)-berkeleyamide D was achieved from the vinylogous esters by a skeletal diversification strategy based on regioselective 5-exo or 6-endo cyclization. This report describes the first enantioselective total synthesis of (+)-rubrobramide and (+)-talaramide A. Additionally, synthetic spirocyclic lactam compounds, including (-)-berkeleyamide D, showed moderate inhibitory activity against amyloid-β aggregation for the potential treatment of Alzheimer's disease.
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Affiliation(s)
- Kosaku Tanaka
- Graduate School of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan.
| | - Kenichi Kobayashi
- Graduate School of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan. .,Graduate School of Pharmaceutical Sciences, Health Sciences University of Hokkaido, 1757, Kanazawa, Tobetsu, Ishikari, Hokkaido 061-0293, Japan
| | - Hiroshi Kogen
- Graduate School of Pharmaceutical Sciences, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan.
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16
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Choo KL, Mirabi B, Demmans KZ, Lautens M. Enantioselective Synthesis of Spiro-oxiranes: An Asymmetric Addition/Aldol/Spirocyclization Domino Cascade. Angew Chem Int Ed Engl 2021; 60:21189-21194. [PMID: 34324779 DOI: 10.1002/anie.202105562] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Indexed: 01/11/2023]
Abstract
Enantioenriched spiro-oxiranes bearing three contiguous stereocenters were synthesized using a rhodium-catalyzed asymmetric addition/aldol/spirocyclization sequence. Starting from a linear substrate, the cascade enabled the formation of a spirocyclic framework in a single step. sp2 - and sp-hybridized carbon nucleophiles were found to be competent initiators for this cascade, giving arylated or alkynylated products, respectively. Derivatization studies demonstrated the synthetic versatility of both the epoxide and the alkyne moieties of the products. DFT calculations were used to reconcile spectroscopic discrepancies observed between the solution- and solid-state structures of the products.
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Affiliation(s)
- Ken-Loon Choo
- Davenport Chemical Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, M5S 3H6, Canada
| | - Bijan Mirabi
- Davenport Chemical Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, M5S 3H6, Canada
| | - Karl Z Demmans
- Davenport Chemical Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, M5S 3H6, Canada
| | - Mark Lautens
- Davenport Chemical Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, M5S 3H6, Canada
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17
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Choo K, Mirabi B, Demmans KZ, Lautens M. Enantioselective Synthesis of Spiro‐oxiranes: An Asymmetric Addition/Aldol/Spirocyclization Domino Cascade. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202105562] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Ken‐Loon Choo
- Davenport Chemical Laboratories Department of Chemistry University of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
| | - Bijan Mirabi
- Davenport Chemical Laboratories Department of Chemistry University of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
| | - Karl Z. Demmans
- Davenport Chemical Laboratories Department of Chemistry University of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
| | - Mark Lautens
- Davenport Chemical Laboratories Department of Chemistry University of Toronto 80 St. George St. Toronto Ontario M5S 3H6 Canada
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18
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Sacchelli BAL, Rocha BC, Andrade LH. Cascade Reactions Assisted by Microwave Irradiation: Ultrafast Construction of 2-Quinolinone-Fused γ-Lactones from N-( o-Ethynylaryl)acrylamides and Formamide. Org Lett 2021; 23:5071-5075. [PMID: 34152153 DOI: 10.1021/acs.orglett.1c01606] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An ultrafast (10 s) methodology to construct novel highly functionalized 2-quinolinones from N-(o-ethynylaryl)acrylamides (1,7-enynes) is described for the first time. Microwave irradiation enabled the ultrafast synthesis of 2-quinolinone-fused γ-lactones from Fenton's reagents in formamide. After six key consecutive reactions, including a diastereoselective step, 2-quinolinone-fused γ-lactones were obtained in good overall yield (up to 46%; 10 s).
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Affiliation(s)
| | - Bianca C Rocha
- Instituto de Química, Universidade de São Paulo, São Paulo, Brasil
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19
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Jiang C, He BB, Zhao RL, Xu MJ, Houk KN, Zhao YL. Computational Exploration of How Enzyme XimE Converts Natural S-Epoxide to Pyran and R-Epoxide to Furan. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01335] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Chuchu Jiang
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China
| | - Bei-Bei He
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China
| | - Rosalinda L. Zhao
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Min-Juan Xu
- Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Centre for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
| | - K. N. Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Yi-Lei Zhao
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China
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20
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Abstract
An efficient and convergent first total syntheses of (±)-japonicol B and (-)-japonicol C have been completed. The notable points of the synthetic route are Lewis-acid-catalyzed Friedel-Crafts reaction for one pot C-C and C-O bond formations resulting in construction of the tricyclic meroterpenoid skeleton, one pot Pd(OH)2/C-catalyzed isomerization/hydrogenation, and site selective sp3 C-H oxidation.
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Affiliation(s)
- Dattatraya H Dethe
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur - 208016, India
| | - Appasaheb K Nirpal
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur - 208016, India
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21
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Ali KB. Asymmetric Epoxidation of Unfunctionalized Olefins Using Novel Chiral Dihydroisoquinolinium Salts as Organocatalysts. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1070428021040205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Nishikawa K, Kumagai M, Matsumura K, Nishikibe K, Morimoto Y. Natural Product Synthesis Strategy Based on the Concept of Directly Constructing the Ring Skeletons from Linear Substrates. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Keisuke Nishikawa
- Department of Chemistry, Graduate School of Science, Osaka City University
| | | | | | | | - Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka City University
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23
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Li FX, Ren SJ, Li PF, Yang P, Qu J. An Endo-Selective Epoxide-Opening Cascade for the Fast Assembly of the Polycyclic Core Structure of Marine Ladder Polyethers. Angew Chem Int Ed Engl 2020; 59:18473-18478. [PMID: 32666578 DOI: 10.1002/anie.202007980] [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: 06/04/2020] [Indexed: 12/13/2022]
Abstract
The rapid synthesis of marine ladder polyethers from polyepoxide precursors (in analogy with the biosynthetic pathway hypothesized by Nakanishi) is hampered by the fact that the exo-selective epoxide-opening cyclization cascade that gives THF-type polyethers is preferred over the endo-selective cascade that gives the desired products. We found that perfluoro-tert-butanol (PFTB) cooperating with 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM]BF4 ) can promote endo-selective epoxide-opening cyclization reactions of trisubstituted epoxy alcohols. Starting from readily accessible homochiral polyepoxy alcohols with a methyl group at all the endo-cyclization sites, we were able to construct polyethers up to five consecutive fused 6-, 7-, and/or 8-membered rings in one step. Notably, molecules with the 7/7/6/6 and 7/7/6/7/6 polyether frameworks of hemibrevetoxin B and brevenal, respectively, could be synthesized in 40 % and 17 % chemical yields.
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Affiliation(s)
- Feng-Xing Li
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Shu-Jian Ren
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Pei-Fang Li
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Peng Yang
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Jin Qu
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
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24
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Li F, Ren S, Li P, Yang P, Qu J. An
Endo
‐Selective Epoxide‐Opening Cascade for the Fast Assembly of the Polycyclic Core Structure of Marine Ladder Polyethers. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007980] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Feng‐Xing Li
- The State Key Laboratory and Institute of Elemento-Organic Chemistry College of Chemistry Nankai University Tianjin 300071 China
| | - Shu‐Jian Ren
- The State Key Laboratory and Institute of Elemento-Organic Chemistry College of Chemistry Nankai University Tianjin 300071 China
| | - Pei‐Fang Li
- The State Key Laboratory and Institute of Elemento-Organic Chemistry College of Chemistry Nankai University Tianjin 300071 China
| | - Peng Yang
- The State Key Laboratory and Institute of Elemento-Organic Chemistry College of Chemistry Nankai University Tianjin 300071 China
| | - Jin Qu
- The State Key Laboratory and Institute of Elemento-Organic Chemistry College of Chemistry Nankai University Tianjin 300071 China
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25
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Das AJ, Borgohain H, Sarma B, Das SK. Switching of regioselectivity in base-mediated diastereoselective annulation of 2,3-epoxy tosylates and their N-tosylaziridine analogs with 2-mercaptobenzimidazole. Org Biomol Chem 2020; 18:441-449. [PMID: 31894811 DOI: 10.1039/c9ob02454a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A base-mediated dinucleophilic cyclization of readily accessible 2,3-epoxy tosylates with 2-mercaptobenzimidazole has been developed for the one-pot diastereoselective synthesis of benzimidazole-based tricyclic compounds equipped with two stereogenic centres. With trans-substrates bearing an aryl or alkyl substituent at the C3 position, the reaction involves an initial S-C1 bond-forming intermolecular alkylation followed by an N-C3 bond-forming, endo-selective intramolecular epoxide ring-opening cyclization reaction. A spectacular regioselectivity switching (tandem S-C3 and N-C1 bond formation reactions) was observed with related trans-N-tosylaziridine substrates. Wide substrate scope, complete diastereoselectivity, high to complete regioselectivity and mild transition metal-free conditions render this protocol particularly efficient and practical.
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Affiliation(s)
- Arup Jyoti Das
- Department of Chemical Sciences, Tezpur University, Tezpur, Napaam, Assam, India-784028.
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26
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Kelley EH, Jamison TF. Synthesis of the EFG Framework of Tamulamides A and B. Org Lett 2019; 21:8027-8030. [PMID: 31523969 PMCID: PMC6778004 DOI: 10.1021/acs.orglett.9b03015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Synthesis of the fused polycyclic ether motif comprising the EFG rings of the marine ladder polyethers tamulamides A and B has been achieved via two different etherification strategies. Ultimately, a reductive etherification approach proved most successful due to tolerance of the G ring substitution and provided the EFG 6,7,6 ring system in 58% yield.
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Affiliation(s)
- Elizabeth H Kelley
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Timothy F Jamison
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
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27
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Nishikawa K, Morita K, Hashimoto S, Hoshino A, Ikeuchi T, Kumagai M, Morimoto Y. Critical Switching of Cyclization Modes of Polyepoxides in Acidic Aqueous Media and Neutral Water: Synthesis and Revised Structure of a Nerolidol-Type Sesquiterpenoid. Angew Chem Int Ed Engl 2019; 58:10168-10172. [PMID: 31211481 DOI: 10.1002/anie.201906039] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Indexed: 11/12/2022]
Abstract
Biomimetic epoxide-opening cascades of polyepoxides enable the efficient and rapid construction of polyether frameworks. Herein, we show that the epoxide-opening cascade cyclization that affords tetrahydrofuran products in acidic aqueous media produces tetrahydropyran (THP) in neutral water. THP formation proceeded by simply heating polyepoxides in neutral water and followed a different cyclization mode from those observed so far. The novel cascade cyclization in H2 O was applied to the synthesis of a new nerolidol-type sesquiterpenoid, resulting in revision of the proposed structure and determination of the absolute configuration.
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Affiliation(s)
- Keisuke Nishikawa
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Kengo Morita
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Subaru Hashimoto
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Akihiro Hoshino
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Takumi Ikeuchi
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Momochika Kumagai
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan.,Japan Food Research Laboratories, Ibaraki-shi, Osaka, 567-0085, Japan
| | - Yoshiki Morimoto
- Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
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28
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Nishikawa K, Morita K, Hashimoto S, Hoshino A, Ikeuchi T, Kumagai M, Morimoto Y. Critical Switching of Cyclization Modes of Polyepoxides in Acidic Aqueous Media and Neutral Water: Synthesis and Revised Structure of a Nerolidol‐Type Sesquiterpenoid. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Keisuke Nishikawa
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Kengo Morita
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Subaru Hashimoto
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Akihiro Hoshino
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Takumi Ikeuchi
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
| | - Momochika Kumagai
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
- Japan Food Research Laboratories Ibaraki-shi Osaka 567-0085 Japan
| | - Yoshiki Morimoto
- Department of ChemistryGraduate School of ScienceOsaka City University Sumiyoshi-ku Osaka 558-8585 Japan
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29
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Lazzara NC, Rosano RJ, Vagadia PP, Giovine MT, Bezpalko MW, Piro NA, Kassel WS, Boyko WJ, Zubris DL, Schrader KK, Wedge DE, Duke SO, Giuliano RM. Synthesis and Biological Evaluation of 6-[(1R)-1-Hydroxyethyl]-2,4a(R),6(S),8a(R)-tetrahydropyrano-[3,2-b]-pyran-2-one and Structural Analogues of the Putative Structure of Diplopyrone. J Org Chem 2018; 84:666-678. [DOI: 10.1021/acs.joc.8b02490] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicholas C. Lazzara
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Robert J. Rosano
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Purav P. Vagadia
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Matthew T. Giovine
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Mark W. Bezpalko
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Nicholas A. Piro
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Wm. Scott Kassel
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Walter J. Boyko
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Deanna L. Zubris
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Kevin K. Schrader
- Natural Products Utilization Research Unit, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 1848, University, Mississippi 38677, United States
| | - David E. Wedge
- Natural Products Utilization Research Unit, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 1848, University, Mississippi 38677, United States
| | - Stephen O. Duke
- Natural Products Utilization Research Unit, Agricultural Research Service, U.S. Department of Agriculture, P.O. Box 1848, University, Mississippi 38677, United States
| | - Robert M. Giuliano
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
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30
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Liu Z, Hu X. Palladium‐Catalyzed Propargylic [n+2] Cycloaddition: An Efficient Strategy for Construction of Benzo‐Fused Medium‐Sized Heterocycles. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Zhen‐Ting Liu
- Dalian Institute of Chemical PhysicsChinese Academy of Sciences 457 Zhongshan Road Dalian 116023 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049 People's Republic of China
| | - Xiang‐Ping Hu
- Dalian Institute of Chemical PhysicsChinese Academy of Sciences 457 Zhongshan Road Dalian 116023 People's Republic of China
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31
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Kelley EH, Jamison TF. Synthesis of the ABC framework of tamulamides A and B. Bioorg Med Chem 2018; 26:5327-5335. [PMID: 29729986 DOI: 10.1016/j.bmc.2018.04.046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 04/19/2018] [Accepted: 04/20/2018] [Indexed: 11/29/2022]
Abstract
Synthesis of the fused tetrahydrofuran motif comprising the ABC rings of the marine ladder polyethers tamulamides A and B has been achieved via two different polyepoxide cascade strategies. Investigations into a triepoxide cascade under aqueous conditions revealed the importance of the electronic nature of the cascade end-group with this initial approach. Ultimately, a diepoxide cascade under basic conditions proved most successful, providing the ABC tetrahydropyran triad in 41% yield.
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Affiliation(s)
- Elizabeth H Kelley
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, United States
| | - Timothy F Jamison
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, United States.
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32
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Dubbu S, Vankar YD. Reaction of 1,2-Anhydrosugars with Arynes: An Approach to 1,2-Dihydrobenzofuran-Fused C
-Aryl Glycosides and C2-O
-Phenolic Glycals. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800705] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sateesh Dubbu
- Department of chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
| | - Yashwant D. Vankar
- Department of chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
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33
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Ma Z, Chen C. Natural products as inspiration for the development of new synthetic methods. J CHIN CHEM SOC-TAIP 2018; 65:43-59. [PMID: 29430058 PMCID: PMC5800783 DOI: 10.1002/jccs.201700134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Natural products have played an important role in shaping modern synthetic organic chemistry. In particular, their complex molecular skeletons have stimulated the development of many new synthetic methods. We highlight in this article some recent examples of synthetic design inspired by the biosynthesis of natural products.
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Affiliation(s)
- Zhiqiang Ma
- Department of Biochemistry, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, USA
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, P. R. China
| | - Chuo Chen
- Department of Biochemistry, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, USA
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34
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Barbero H, Díez-Poza C, Barbero A. The Oxepane Motif in Marine Drugs. Mar Drugs 2017; 15:E361. [PMID: 29140270 PMCID: PMC5706050 DOI: 10.3390/md15110361] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 11/03/2017] [Accepted: 11/08/2017] [Indexed: 12/12/2022] Open
Abstract
Oceans have shown to be a remarkable source of natural products. The biological properties of many of these compounds have helped to produce great advances in medicinal chemistry. Within them, marine natural products containing an oxepanyl ring are present in a great variety of algae, sponges, fungus and corals and show very important biological activities, many of them possessing remarkable cytotoxic properties against a wide range of cancer cell lines. Their rich chemical structures have attracted the attention of many researchers who have reported interesting synthetic approaches to these targets. This review covers the most prominent examples of these types of compounds, focusing the discussion on the isolation, structure determination, medicinal properties and total synthesis of these products.
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Affiliation(s)
- Héctor Barbero
- GIR MIOMeT, IU CINQUIMA/Inorganic Chemistry, University of Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain.
| | - Carlos Díez-Poza
- Department of Organic Chemistry, University of Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain.
| | - Asunción Barbero
- Department of Organic Chemistry, University of Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain.
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35
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Liu J, Xu Y, Yang J, Wang W, Zhang J, Zhang R, Meng Q. Discovery, semisynthesis, biological activities, and metabolism of ocotillol-type saponins. J Ginseng Res 2017; 41:373-378. [PMID: 28701880 PMCID: PMC5489761 DOI: 10.1016/j.jgr.2017.01.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2016] [Revised: 12/31/2016] [Accepted: 01/02/2017] [Indexed: 11/30/2022] Open
Abstract
Ocotillol-type saponins are one kind of tetracyclic triterpenoids, sharing a tetrahydrofuran ring. Natural ocotillol-type saponins have been discovered in Panax quinquefolius L., Panax japonicus, Hana mina, and Vietnamese ginseng. In recent years, the semisynthesis of 20(S/R)-ocotillol-type saponins has been reported. The biological activities of ocotillol-type saponins include neuroprotective effect, antimyocardial ischemia, antiinflammatory, antibacterial, and antitumor activities. Owing to their chemical structure, pharmacological actions, and the stereoselective activity on antimyocardial ischemia, ocotillol-type saponins are subjected to extensive consideration. In this review, we sum up the discovery, semisynthesis, biological activities, and metabolism of ocotillol-type saponins.
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Affiliation(s)
| | | | | | | | | | | | - Qingguo Meng
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation (Yantai University), Ministry of Education, Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University, Yantai, China
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36
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Forster L, Pierens GK, White AM, Cheney KL, Dewapriya P, Capon RJ, Garson MJ. Cytotoxic Spiroepoxide Lactone and Its Putative Biosynthetic Precursor from Goniobranchus Splendidus. ACS OMEGA 2017; 2:2672-2677. [PMID: 30023672 PMCID: PMC6044697 DOI: 10.1021/acsomega.7b00641] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Accepted: 06/02/2017] [Indexed: 06/08/2023]
Abstract
Epoxygoniolide-1 (1), possessing spiroepoxide lactone, enal, and masked dialdehyde functionalities, has been characterized from the conspicuously patterned mollusc Goniobranchus splendidus. Its relative configuration was investigated by spectroscopic analyses, molecular modeling, and density functional theory calculations. The biosynthesis of 1 may involve rearrangement of a diterpene framework, providing a precursor to cometabolite gonioline (2), followed by C-C bond cleavage (via Grob or P450 mechanism). Moderate cytotoxicity to NCIH-460, SW60, or HepG2 cancer cells was observed for norditerpene 1.
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Affiliation(s)
- Louise
C. Forster
- School
of Chemistry and Molecular Biosciences, Centre for Advanced Imaging, School of Biological
Sciences, and Institute for Molecular Bioscience, The
University of Queensland, Brisbane, 4072 QLD, Australia
| | - Gregory K. Pierens
- School
of Chemistry and Molecular Biosciences, Centre for Advanced Imaging, School of Biological
Sciences, and Institute for Molecular Bioscience, The
University of Queensland, Brisbane, 4072 QLD, Australia
| | - Andrew M. White
- School
of Chemistry and Molecular Biosciences, Centre for Advanced Imaging, School of Biological
Sciences, and Institute for Molecular Bioscience, The
University of Queensland, Brisbane, 4072 QLD, Australia
| | - Karen L. Cheney
- School
of Chemistry and Molecular Biosciences, Centre for Advanced Imaging, School of Biological
Sciences, and Institute for Molecular Bioscience, The
University of Queensland, Brisbane, 4072 QLD, Australia
| | - Pradeep Dewapriya
- School
of Chemistry and Molecular Biosciences, Centre for Advanced Imaging, School of Biological
Sciences, and Institute for Molecular Bioscience, The
University of Queensland, Brisbane, 4072 QLD, Australia
| | - Robert J. Capon
- School
of Chemistry and Molecular Biosciences, Centre for Advanced Imaging, School of Biological
Sciences, and Institute for Molecular Bioscience, The
University of Queensland, Brisbane, 4072 QLD, Australia
| | - Mary J. Garson
- School
of Chemistry and Molecular Biosciences, Centre for Advanced Imaging, School of Biological
Sciences, and Institute for Molecular Bioscience, The
University of Queensland, Brisbane, 4072 QLD, Australia
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37
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Day AJ, Lam HC, Sumby CJ, George JH. Biomimetic Total Synthesis of Rhodonoids C and D, and Murrayakonine D. Org Lett 2017; 19:2463-2465. [DOI: 10.1021/acs.orglett.7b00779] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Aaron J. Day
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
| | - Hiu C. Lam
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
| | | | - Jonathan H. George
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
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38
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Rajasekaran P, Singh GP, Hassam M, Vankar YD. A Cascade “Prins-Pinacol-Type Rearrangement and C4-OBn Participation” on Carbohydrate Substrates: Synthesis of Bridged Tricyclic Ketals, Annulated Sugars and C2-Branched Heptoses. Chemistry 2016; 22:18383-18387. [DOI: 10.1002/chem.201604902] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Indexed: 12/25/2022]
Affiliation(s)
| | - Govind Pratap Singh
- Department of Chemistry; Indian Institute of Technology; Kanpur 208016 India
| | - Mohammad Hassam
- Department of Chemistry; Indian Institute of Technology; Kanpur 208016 India
| | - Yashwant D. Vankar
- Department of Chemistry; Indian Institute of Technology; Kanpur 208016 India
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39
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Tanemura K, Suzuki T. Aniline-terephthalaldehyde resin p-toluenesulfonate (ATRT) as a highly efficient and reusable catalyst for alcoholysis, hydrolysis, and acetolysis of epoxides. SYNTHETIC COMMUN 2016. [DOI: 10.1080/00397911.2016.1223309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Kiyoshi Tanemura
- Chemical Laboratory, School of Life Dentistry at Niigata, Nippon Dental University, Hamaura-cho, Niigata, Japan
| | - Tsuneo Suzuki
- Chemical Laboratory, School of Life Dentistry at Niigata, Nippon Dental University, Hamaura-cho, Niigata, Japan
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40
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Affiliation(s)
- Ashwini A. Ghogare
- Department
of Chemistry, Brooklyn College, 2900 Bedford Avenue, Brooklyn, New York 11210, United States
- Ph.D.
Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Alexander Greer
- Department
of Chemistry, Brooklyn College, 2900 Bedford Avenue, Brooklyn, New York 11210, United States
- Ph.D.
Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
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41
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Gilmore K, Mohamed RK, Alabugin IV. The Baldwin rules: revised and extended. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2016. [DOI: 10.1002/wcms.1261] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Kerry Gilmore
- Department of Biomolecular Systems; Max Planck Institute of Colloids and Interfaces; Potsdam Germany
| | - Rana K. Mohamed
- Department of Chemistry and Biochemistry; Florida State University; Tallahassee FL USA
| | - Igor V. Alabugin
- Department of Chemistry and Biochemistry; Florida State University; Tallahassee FL USA
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42
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Identification of gymnodimine D and presence of gymnodimine variants in the dinoflagellate Alexandrium ostenfeldii from the Baltic Sea. Toxicon 2016; 112:68-76. [PMID: 26829651 DOI: 10.1016/j.toxicon.2016.01.064] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 01/19/2016] [Accepted: 01/26/2016] [Indexed: 11/21/2022]
Abstract
Gymnodimines are lipophilic toxins produced by the marine dinoflagellates Karenia selliformis and Alexandrium ostenfeldii. Currently four gymnodimine analogues are known and characterized. Here we describe a novel gymnodimine and a range of gymnodimine related compounds found in an A. ostenfeldii isolate from the northern Baltic Sea. Gymnodimine D (1) was extracted and purified from clonal cultures, and characterized by liquid chromatography-tandem mass spectrometry (LC-MS/MS), nuclear magnetic resonance (NMR) spectroscopy, and liquid chromatography-high resolution mass spectrometry (LC-HRMS) experiments. The structure of 1 is related to known gymnodimines (2-5) with a six-membered cyclic imine ring and several other fragments typical of gymnodimines. However, the carbon chain in the gymnodimine macrocyclic ring differs from the known gymnodimines in having two tetrahydrofuran rings in the macrocyclic ring.
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43
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Sigrist R, da Costa BZ, Marsaioli AJ, de Oliveira LG. Nature-inspired enzymatic cascades to build valuable compounds. Biotechnol Adv 2015; 33:394-411. [PMID: 25795056 DOI: 10.1016/j.biotechadv.2015.03.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 03/09/2015] [Indexed: 11/30/2022]
Abstract
Biocatalysis currently is focusing on enzymatic and multi-enzymatic cascade processes instead of single steps imbedded into chemical pathways. Alongside this scientific revolution, this review provides an overview on multi-enzymatic cascades that are responsible for the biosynthesis of some terpenes, alkaloids and polyethers, which are important classes of natural products. Herein, we illustrate the development of studies inspired by multi- and chemo-enzymatic approaches to build the core moieties of polyethers, polypeptide alkaloids, piperidines and pyrrolidines promoted by the joint action of oxidoreductases, hydrolases, cyclases, transaminases and imine reductases.
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Affiliation(s)
- Renata Sigrist
- Department of Organic Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil
| | - Bruna Zucoloto da Costa
- Department of Organic Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil
| | - Anita Jocelyne Marsaioli
- Department of Organic Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil
| | - Luciana Gonzaga de Oliveira
- Department of Organic Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil.
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44
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Czabaniuk LC, Jamison TF. Hydroxyl-substituted ladder polyethers via selective tandem epoxidation/cyclization sequence. Org Lett 2015; 17:774-7. [PMID: 25647091 DOI: 10.1021/ol503400j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new and highly selective method for the synthesis of hydroxyl-substituted tetrahydropyrans is described. This method utilizes titanium(IV) isopropoxide and diethyl tartrate to perform a diastereoselective epoxidation followed by in situ epoxide activation and highly selective endo-cyclization to form the desired tetrahydropyran ring. The HIJ ring fragment of the marine ladder polyether yessotoxin was synthesized using this two-stage tactic that proceeds with high efficiency and excellent regioselectivity.
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Affiliation(s)
- Lara C Czabaniuk
- Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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45
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σ-Ferrier rearrangement of carbohydrate derived vinylcyclopropanes: a facile approach to oxepane analogs. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.07.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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46
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Zhu Y, Wang Q, Cornwall RG, Shi Y. Organocatalytic asymmetric epoxidation and aziridination of olefins and their synthetic applications. Chem Rev 2014; 114:8199-256. [PMID: 24785198 DOI: 10.1021/cr500064w] [Citation(s) in RCA: 326] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Yingguang Zhu
- Department of Chemistry, Colorado State University , Fort Collins, Colorado 80523, United States
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47
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Sheikh NS. Comparative perspective and synthetic applications of transition metal mediated oxidative cyclisation of 1,5-dienes towards cis-2,5-disubstituted tetrahydrofurans. Org Biomol Chem 2014; 12:9492-504. [DOI: 10.1039/c4ob01491j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis ofcis-2,5-disubstituted tetrahydrofuran rings from 1,5-diene precursors using metal-oxo species along with their mechanistic proposals and synthetic applications is concisely reviewed.
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Affiliation(s)
- Nadeem S. Sheikh
- Department of Chemistry
- Faculty of Science
- King Faisal University
- Al-Ahsa 31982, Saudi Arabia
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48
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Sheikh NS. Synthetic endeavours towards oxasqualenoid natural products containing 2,5-disubstituted tetrahydrofurans – eurylene and teurilene. Nat Prod Rep 2014; 31:1088-100. [DOI: 10.1039/c4np00029c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Given the unique structural features of oxasqualenoid natural products and their cytotoxicity, representative examples from oxasqualenoids, eurylene and teurilene have been briefly reviewed. Both compounds possess cis- and trans-2,5-disubstituted tetrahydrofuran rings and represent chiral and achiral facets found in this class of natural products.
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Affiliation(s)
- Nadeem S. Sheikh
- Department of Chemistry
- Faculty of Science
- King Faisal University
- Al-Ahsa 31982, Saudi Arabia
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49
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Mousseau JJ, Morten CJ, Jamison TF. A dioxane template for highly selective epoxy alcohol cyclizations. Chemistry 2013; 19:10004-16. [PMID: 23775936 PMCID: PMC3763493 DOI: 10.1002/chem.201300845] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Indexed: 11/06/2022]
Abstract
Ladder polyether natural products are a class of natural products denoted by their high functional-group density and large number of well-defined stereocenters. They comprise the toxic component of harmful algal blooms (HABs), having significant negative economic and environmental ramifications. However, their mode of action, namely blocking various cellular ion channels, also denotes their promise as potential anticancer agents. Understanding their potential mode of biosynthesis will not only help with developing ways to limit the damage of HABs, but would also facilitate the synthesis of a range of analogs with interesting biological activity. 1,3-Dioxan-5-ol substrates display remarkable 'enhanced template effects' in water-promoted epoxide cyclization processes en route to the synthesis of these ladder polyether natural products. In many cases, they provide near complete endo-to-exo selectivity in the cyclization of epoxy alcohols, thereby strongly favoring the formation of tetrahydropyran (THP) over tetrahydrofuran (THF) rings. The effects of various Brønsted and Lewis acidic and basic conditions are explored to demonstrate the superior selectivity of the template over the previously reported THP-based epoxy alcohols. In addition, the consideration of other synthetic routes are also considered with the goal of gaining rapid access to a plethora of potential starting materials applicable towards the synthesis of ladder polyethers. Finally, cascade sequences with polyepoxides are investigated, further demonstrating the versatility of this new reaction template.
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Affiliation(s)
- James J. Mousseau
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
| | - Christopher J. Morten
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
| | - Timothy F. Jamison
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
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50
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Pérez-Mayoral E, Matos I, Nachtigall P, Položij M, Fonseca I, Vitvarová-Procházková D, Čejka J. Intramolecular hydroalkoxylation of non-activated C=C bonds catalysed by zeolites: an experimental and theoretical study. CHEMSUSCHEM 2013; 6:1021-1030. [PMID: 23703734 DOI: 10.1002/cssc.201300173] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Indexed: 06/02/2023]
Abstract
The high activity and selectivity of zeolites in the cyclisation of unsaturated alcohols is reported for the first time; the details of a reaction mechanism based on quantum chemical calculations are also provided. The high efficiency of zeolites MFI, BEA and FAU in the cyclisation of unsaturated alcohols (cis-decen-1-ol, 6-methylhept-5-en-2-ol and 2-allylphenol) to afford oxygen-containing heterocyclic rings is demonstrated. The best catalytic performance is found for zeolites with the optimum concentration of Brønsted acid sites (ca. 0.2 mmol g(-1)) and the minimum number of Lewis acid sites. It is proposed that the efficiency of the catalysts is reduced by the existence of the so-called dual site, at which a molecule of unsaturated alcohol can simultaneously interact with two acid sites (an OH group with one and the double bond with the other Brønsted site), which increases the interaction strength. The formation of such adsorption complexes leads to a decrease in the catalyst activity because of (i) an increase in the reaction barrier, (ii) an unfavourable conformation and (iii) diffusion limitations. A new procedure for the preparation of tetrahydrofurans and pyrans over zeolite catalysts provides important oxygen-containing heterocycles with numerous applications.
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Affiliation(s)
- Elena Pérez-Mayoral
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic
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