1
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Xiao JX, Li FX, Ren SJ, Qu J. Studies on the Biomimetic Synthesis of Marine Ladder Polyethers via Endo-Selective Epoxide-to-Epoxonium Ring-Opening Cascades. Angew Chem Int Ed Engl 2024; 63:e202403597. [PMID: 38752455 DOI: 10.1002/anie.202403597] [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: 02/21/2024] [Indexed: 07/16/2024]
Abstract
Marine ladder polyethers have attracted the attention of chemists and biologists because of their potent biological activities. Synthetic chemists have attempted to construct their polyether frameworks by epoxide ring-opening cascades, as Nakanishi hypothesis describes. However, Baldwin's rules of ring closure state that exo-selective intramolecular cyclization of epoxy alcohols is preferred over endo-selective cyclization. Herein, we investigated epoxide ring-opening cascades of polyepoxy alcohols in [EMIM]BF4/PFTB (1-ethyl-3-methylimidazolium tetrafluoroborate /perfluoro-tert-butyl alcohol) and found that all-endo products were formed via epoxide-to-epoxonium ring-opening cyclizations (not restricted by Baldwin's rules, which only apply to intramolecular hydroxyl-to-epoxide cyclizations). We determined that the key factor enabling polyepoxy alcohols to undergo a high proportion of all-endo-selective cyclization was inhibition of exo-selective hydroxyl-to-epoxide cyclization starting from the terminal hydroxyl group of a polyepoxy alcohol. By introducing a slow-release protecting group to the terminal hydroxyl group, we could markedly increase the cyclization yields of polyether fragments with hydrogen atoms at the ring junctions. For the first time, we constructed consecutively fused six-membered-ring and fused seven-, eight-, and nine-membered-ring polyether fragments by epoxide-to-epoxonium ring-opening cyclizations through the addition of a suitable Lewis acid. We also suggest that the biosynthesis of marine ladder polyethers may proceed via epoxide-to-epoxonium ring-opening cyclization of polyepoxide.
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Affiliation(s)
- Jia-Xi Xiao
- College of Chemistry, Nankai University, The State Key Laboratory and Institute of Elemento-Organic Chemistry, Tianjin, 300071, China
| | - Feng-Xing Li
- College of Chemistry, Nankai University, The State Key Laboratory and Institute of Elemento-Organic Chemistry, Tianjin, 300071, China
| | - Shu-Jian Ren
- College of Chemistry, Nankai University, The State Key Laboratory and Institute of Elemento-Organic Chemistry, Tianjin, 300071, China
| | - Jin Qu
- College of Chemistry, Nankai University, The State Key Laboratory and Institute of Elemento-Organic Chemistry, Tianjin, 300071, China
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2
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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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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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Fallon TR, Shende VV, Wierzbicki IH, Auber RP, Gonzalez DJ, Wisecaver JH, Moore BS. Giant polyketide synthase enzymes biosynthesize a giant marine polyether biotoxin. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.29.577497. [PMID: 38352448 PMCID: PMC10862718 DOI: 10.1101/2024.01.29.577497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Prymnesium parvum are harmful haptophyte algae that cause massive environmental fish-kills. Their polyketide polyether toxins, the prymnesins, are amongst the largest nonpolymeric compounds in nature, alongside structurally-related health-impacting "red-tide" polyether toxins whose biosynthetic origins have been an enigma for over 40 years. Here we report the 'PKZILLAs', massive P. parvum polyketide synthase (PKS) genes, whose existence and challenging genomic structure evaded prior detection. PKZILLA-1 and -2 encode giant protein products of 4.7 and 3.2 MDa with 140 and 99 enzyme domains, exceeding the largest known protein titin and all other known PKS systems. Their predicted polyene product matches the proposed pre-prymnesin precursor of the 90-carbon-backbone A-type prymnesins. This discovery establishes a model system for microalgal polyether biosynthesis and expands expectations of genetic and enzymatic size limits in biology.
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Affiliation(s)
- Timothy R. Fallon
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography and University of California, San Diego; 9500 Gilman Dr #0204, La Jolla, CA 92093, USA
| | - Vikram V. Shende
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography and University of California, San Diego; 9500 Gilman Dr #0204, La Jolla, CA 92093, USA
| | - Igor H. Wierzbicki
- Department of Pharmacology, University of California, San Diego; 9500 Gilman Dr, La Jolla, CA 92093, USA
| | - Robert P. Auber
- Department of Biochemistry, Purdue University; 175 S University St, West Lafayette, IN 47907, USA
- Purdue Center for Plant Biology, Purdue University; 175 S University St, West Lafayette, IN 47907, USA
| | - David J. Gonzalez
- Department of Pharmacology, University of California, San Diego; 9500 Gilman Dr, La Jolla, CA 92093, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego; 9500 Gilman Dr, La Jolla, CA 92093, USA
| | - Jennifer H. Wisecaver
- Department of Biochemistry, Purdue University; 175 S University St, West Lafayette, IN 47907, USA
- Purdue Center for Plant Biology, Purdue University; 175 S University St, West Lafayette, IN 47907, USA
| | - Bradley S. Moore
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography and University of California, San Diego; 9500 Gilman Dr #0204, La Jolla, CA 92093, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego; 9500 Gilman Dr, La Jolla, CA 92093, USA
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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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Maltby K, Sharma K, Short MAS, Farooque S, Hamill R, Blacker AJ, Kapur N, Willans CE, Nguyen BN. Rationalizing and Adapting Water-Accelerated Reactions for Sustainable Flow Organic Processes. ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2023; 11:8675-8684. [PMID: 37323809 PMCID: PMC10265699 DOI: 10.1021/acssuschemeng.3c02164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 05/16/2023] [Indexed: 06/17/2023]
Abstract
Water-accelerated reactions, wherein at least one organic reactant is not soluble in water, are an important class of organic reactions, with a potentially pivotal impact on sustainability of chemical manufacturing processes. However, mechanistic understanding of the factors controlling the acceleration effect has been limited, due to the complex and varied physical and chemical nature of these processes. In this study, a theoretical framework has been established to calculate the rate acceleration of known water-accelerated reactions, giving computational estimations of the change to ΔG‡ which correlate with experimental data. In-depth study of a Henry reaction between N-methylisatin and nitromethane using our framework led to rationalization of the reaction kinetics, its lack of dependence on mixing, kinetic isotope effect, and different salt effects with NaCl and Na2SO4. Based on these findings, a multiphase flow process which includes continuous phase separation and recycling of the aqueous phase was developed, and its superior green metrics (PMI-reaction = 4 and STY = 0.64 kg L-1 h-1) were demonstrated. These findings form the essential basis for further in silico discovery and development of water-accelerated reactions for sustainable manufacturing.
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Affiliation(s)
- Katarzyna
A. Maltby
- Institute
of Process Research & Development, School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Krishna Sharma
- Institute
of Process Research & Development, School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Marc A. S. Short
- Institute
of Process Research & Development, School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Sannia Farooque
- Institute
of Process Research & Development, School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Rosalie Hamill
- Institute
of Process Research & Development, School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - A. John Blacker
- Institute
of Process Research & Development, School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Nikil Kapur
- School
of Mechanical Engineering, University of
Leeds, Leeds LS2 9JT, U.K.
| | - Charlotte E. Willans
- Institute
of Process Research & Development, School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Bao N. Nguyen
- Institute
of Process Research & Development, School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
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7
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Thermo-responsive self-folding feedstock with excellent shape memory programming. CHEMICAL PAPERS 2023. [DOI: 10.1007/s11696-023-02693-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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8
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Xiong C, Xue C, Yu X, He Y, Liang Y, Zhou X, Ji H. Tuning the olefin-VOCs epoxidation performance of ceria by mechanochemical loading of coinage metal. JOURNAL OF HAZARDOUS MATERIALS 2023; 441:129888. [PMID: 36084466 DOI: 10.1016/j.jhazmat.2022.129888] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/28/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
Under the background of carbon dioxide emission reduction, how to realize the treatment and the high value-added conversion of typical olefin volatile organic compounds (olefin-VOCs), such as styrene, is a big challenge. In this contribution, the ceria-supported coinage metal catalysts (M/CeO2, M = Au, Ag, and Cu) are successfully synthesized by a dry mechanochemical method, and their catalytic performance for styrene-VOC epoxidation with tert-butyl hydrogen peroxide (TBHP) as an oxidant to prepare high-value styrene oxide (SO) is investigated. The oxygen vacancies of ceria play a key role in the anchoring of metal nanoparticles. After ball milling, Au(III) is partially reduced and coexists on ceria in two valence states (Au3+ and Au0), and the reactive oxygen species of the as-prepared catalyst are enhanced. The catalytic behaviors, including solvents effect, substrate concentration, oxidant ratio, catalyst dosage, reaction time, and temperature, are systematically investigated. Au/CeO2 exhibits good styrene epoxidation performance with a total styrene conversion of 94% and a SO yield of 63%, along with good reusability and substrate scalability. Thermodynamics and kinetics show that Au/CeO2 was more favorable for styrene epoxidation and this reaction is dominated by the rate of intrinsic chemical reactions on the surface of the catalyst. Based on experimental discussions and a set of characterizations (XPS, XRD, in-situ FT-IR, ESR, ESI-HSMS, etc.), the mechanism is revealed as the synergistic catalysis between the reactive oxygen species of Au/CeO2 and the peroxide radicals generated by the homolysis of TBHP.
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Affiliation(s)
- Chao Xiong
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Can Xue
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, PR China; Guangdong Provincial Key Laboratory of Optical Chemicals, XinHuaYue Group, Maoming 525000, PR China.
| | - Xingrui Yu
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, PR China
| | - Yaorong He
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China
| | - Yichao Liang
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, PR China
| | - Xiantai Zhou
- School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, PR China
| | - Hongbing Ji
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China; Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516000, PR China.
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9
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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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10
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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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11
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Pradhan TR, Paudel M, Feoktistova T, Cheong PHY, Park JK. Silaborative Assembly of Allenamides and Alkynes: Highly Regio- and Stereocontrolled Access to Bi- or Trimetallic Skipped Dienes. Angew Chem Int Ed Engl 2022; 61:e202116154. [PMID: 35142019 DOI: 10.1002/anie.202116154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Indexed: 12/16/2022]
Abstract
A highly stereo- and regiocontrolled multicomponent approach to skipped 1,4-dienes decorated with one boryl and two silyl functionalities is described. This Pd-catalyzed atom-economical union of allenamides, alkynes, and Me2 PhSiBpin (or Et3 SiBpin) proceeds without the use of phosphine ligands, instead relying on chelation through the internal amide group of the allenamide sulfonyl. A variety of alkynes, including those derived from complex bioactive molecules, can be efficiently coupled with allenamides and Me2 PhSiBpin in good yields and with excellent selectivity. The synthetic potential was demonstrated through multiple valuable chemoselective transformations, establishing new disconnections for functionalized dienes. Density functional theory calculations revealed that the reaction first proceeded through borylation of the allenamide, followed by silylation of the alkyne and then reductive elimination, which convergently assemble the skipped 1,4-diene.
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Affiliation(s)
- Tapas R Pradhan
- Department of Chemistry and Institution for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | - Mukti Paudel
- Department of Chemistry and Institution for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | | | | | - Jin Kyoon Park
- Department of Chemistry and Institution for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
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12
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Bai P, Jiang Y, Xiao T, Qin G. A Single‐Step Synthesis of Stereodefined Skipped Trienes: Pd‐Catalyzed Cascade Reaction of Terminal Alkynes with Allylic Halides. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200143] [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)
- Peizhi Bai
- Kunming University of Science and Technology Faculty of Science CHINA
| | - Yubo Jiang
- Kunming University of Science and Technology Faculty of Science CHINA
| | - Tiebo Xiao
- Kunming University of Science and Technology Faculty of Science CHINA
| | - Guiping Qin
- Kunming University of Science and Technology Faculty of Science 727 South Jingming Road, Chenggong District, Kunming 650500 Kunming CHINA
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13
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Jeon H, Kang G, Kim MJ, Shin JS, Han S, Lee HY. On the Erosion of Enantiopurity of Rhodonoids via Their Asymmetric Total Synthesis. Org Lett 2022; 24:2181-2185. [PMID: 35266724 DOI: 10.1021/acs.orglett.2c00482] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Rhodonoid natural products are found in nature as a scalemic mixture. This interesting phytochemical feature is presumed to originate from a reversible electrocyclic ring opening of the chromene core present in the biogenetic precursors of rhodonoids. Herein, we systematically investigated factors that are responsible for this racemization event. This eventually led us to complete the asymmetric total synthesis of rhodonoids A, C, D, and G.
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Affiliation(s)
- Hyeju Jeon
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Gyumin Kang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Myungjo J Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Ji Soo Shin
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Sunkyu Han
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Hee-Yoon Lee
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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14
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Pradhan TR, Paudel M, Feoktistova T, Cheong PH, Park JK. Silaborative Assembly of Allenamides and Alkynes: Highly Regio‐ and Stereocontrolled Access to Bi‐ or Trimetallic Skipped Dienes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202116154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tapas R. Pradhan
- Department of Chemistry and Institution for Functional Materials Pusan National University Busan 46241 Republic of Korea
| | - Mukti Paudel
- Department of Chemistry and Institution for Functional Materials Pusan National University Busan 46241 Republic of Korea
| | | | | | - Jin Kyoon Park
- Department of Chemistry and Institution for Functional Materials Pusan National University Busan 46241 Republic of Korea
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15
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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] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 12/21/2021] [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.
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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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16
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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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17
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Vartanova AE, Plodukhin AY, Ratmanova NK, Andreev IA, Anisimov MN, Gudimchuk NB, Rybakov VB, Levina II, Ivanova OA, Trushkov IV, Alabugin IV. Expanding Stereoelectronic Limits of endo- tet Cyclizations: Synthesis of Benz[ b]azepines from Donor-Acceptor Cyclopropanes. J Am Chem Soc 2021; 143:13952-13961. [PMID: 34406759 DOI: 10.1021/jacs.1c07088] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The importance of intramolecular constraints in cyclic transition-state geometries is especially pronounced in n-endo-tet cyclizations, where the usual backside approach of a nucleophile to the breaking bond is impossible for the rings containing less than eight atoms. Herein, we expand the limits of endo-tet cyclizations and show that donor-acceptor cyclopropanes can provide a seven-membered ring via a genuine 6-endo-tet process. Substrates containing a N-alkyl-N-arylcarbamoyl moiety as an acceptor group undergo Lewis acid-induced cyclization to form tetrahydrobenz[b]azepin-2-ones in high yields. The reaction proceeds with the inversion of the configuration at the electrophilic carbon. In this process, a formally six-membered transition state yields a seven-membered ring as the pre-existing cycle is merged into the forming ring. The stereochemistry of the products can be controlled by the reaction time and by the nature of Lewis acid, opening access to both diastereomers by tuning of the reaction conditions.
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Affiliation(s)
- Anna E Vartanova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119334, Russian Federation.,Faculty of Science, RUDN University, Moscow 117198, Russian Federation
| | - Andrey Yu Plodukhin
- Department of Chemistry, M. V. Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Nina K Ratmanova
- Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology, and Immunology, Moscow 117997, Russian Federation
| | - Ivan A Andreev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119334, Russian Federation.,Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology, and Immunology, Moscow 117997, Russian Federation
| | - Mikhail N Anisimov
- Department of Physics, M. V. Lomonosov Moscow State University, Moscow 119991, Russian Federation.,Center for Theoretical Problems of Physicochemical Pharmacology, Moscow 119334, Russian Federation
| | - Nikita B Gudimchuk
- Department of Physics, M. V. Lomonosov Moscow State University, Moscow 119991, Russian Federation.,Center for Theoretical Problems of Physicochemical Pharmacology, Moscow 119334, Russian Federation
| | - Victor B Rybakov
- Department of Chemistry, M. V. Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Irina I Levina
- Institute of Biochemical Physics, Russian Academy of Sciences, Moscow 119334, Russian Federation
| | - Olga A Ivanova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119334, Russian Federation.,Department of Chemistry, M. V. Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Igor V Trushkov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119334, Russian Federation
| | - Igor V Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390 United States
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18
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Bowen JI, Wang L, Crump MP, Willis CL. Ambruticins: tetrahydropyran ring formation and total synthesis. Org Biomol Chem 2021; 19:6210-6215. [PMID: 34190301 DOI: 10.1039/d1ob00883h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ambruticins are a family of polyketide natural products which exhibit potent antifungal activity. Gene knockout experiments are in accord with the proposal that the tetrahydropyran ring of the ambruticins is formed via the AmbJ catalysed epoxidation of the unsaturated 3,5-dihydroxy acid, ambruticin J, followed by regioselective cyclisation to ambruticin F. Herein, a convergent approach to the total synthesis of ambruticin J is described as well as model studies involving epoxidation and cyclisations of unsaturated hydroxy esters to give tetrahydropyrans and tetrahydrofurans. The total synthesis involves preparation of three key fragments which were united via a Suzuki-Miyaura cross-coupling and Julia-Kocienski olefination to generate the required carbon framework. Global deprotection to a triol and selective oxidation of the primary alcohol gave, after hydrolysis of the lactone, ambruticin J.
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Affiliation(s)
- James I Bowen
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK.
| | - Luoyi Wang
- Institute of Microbiology, Chinese Academy of Sciences, NO. 1 Beichen West Road, Chaoyang District, Beijing, 100101, China
| | - Matthew P Crump
- School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK.
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19
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Fuwa H. Synthesis-Driven Stereochemical Assignment of Marine Polycyclic Ether Natural Products. Mar Drugs 2021; 19:257. [PMID: 33947080 PMCID: PMC8145320 DOI: 10.3390/md19050257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 04/26/2021] [Accepted: 04/27/2021] [Indexed: 01/11/2023] Open
Abstract
Marine polycyclic ether natural products have gained significant interest from the chemical community due to their impressively huge molecular architecture and diverse biological functions. The structure assignment of this class of extraordinarily complex natural products has mainly relied on NMR spectroscopic analysis. However, NMR spectroscopic analysis has its own limitations, including configurational assignment of stereogenic centers within conformationally flexible systems. Chemical shift deviation analysis of synthetic model compounds is a reliable means to assign the relative configuration of "difficult" stereogenic centers. The complete configurational assignment must be ultimately established through total synthesis. The aim of this review is to summarize the indispensable role of organic synthesis in stereochemical assignment of marine polycyclic ethers.
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Affiliation(s)
- Haruhiko Fuwa
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
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20
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Romero-Montalvo E, DiLabio GA. Computational Study of Hydrogen Bond Interactions in Water Cluster–Organic Molecule Complexes. J Phys Chem A 2021; 125:3369-3377. [DOI: 10.1021/acs.jpca.1c01377] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Eduardo Romero-Montalvo
- Department of Chemistry, University of British Columbia, 3247 University Way, Kelowna, British Columbia, Canada V1V 1V7
| | - Gino A. DiLabio
- Department of Chemistry, University of British Columbia, 3247 University Way, Kelowna, British Columbia, Canada V1V 1V7
- Faculty of Management, University of British Columbia, 1137 Alumni Avenue, Kelowna, British Columbia, Canada V1V 1V7
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21
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Ahsan M, Pindi C, Senapati S. Hydrogen bonding catalysis by water in epoxide ring opening reaction. J Mol Graph Model 2021; 105:107894. [PMID: 33725641 DOI: 10.1016/j.jmgm.2021.107894] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 02/22/2021] [Accepted: 03/01/2021] [Indexed: 11/19/2022]
Abstract
Water can act as catalyst is perhaps the most intriguing property reported of this molecule in the last decade. However, despite being an integral part of many enzyme structures, the role of water in catalyzing enzymatic reactions remains sparsely studied. In a recent study, we have shown that the epoxide ring opening in aspartate proteases follows a two-step process involving water. In this work, we attempt to unravel the electronic basis of the co-catalytic role of water in the epoxide ring opening reaction by employing high-level quantum mechanical calculations at M06-2X/6-31+G(d,p) level of accuracy. Our computed electron density and its reduced gradient show that water anchor the reactant molecules through strong H-bond bridges. In addition, the strong ionizing power of water allows better charge delocalization to stabilize the transition states and oxyanion intermediate. Electrostatic analyses suggest greater charge transfer from the aspartates to the epoxide in the transition state, which is found to be exergonic in nature rendering a low-barrier reaction compared to a control system where water was omitted in the reaction field. This elucidated mechanism at electronic level could promote further research to search for the co-catalytic role of water in other enzymes.
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Affiliation(s)
- Mohd Ahsan
- Department of Biotechnology and BJM School of Biosciences, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Chinmai Pindi
- Department of Biotechnology and BJM School of Biosciences, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Sanjib Senapati
- Department of Biotechnology and BJM School of Biosciences, Indian Institute of Technology Madras, Chennai, 600036, India.
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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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Wang CG, Zhang Y, Wang S, Chen B, Li Y, Ni HL, Gao Y, Hu P, Wang BQ, Cao P. Nickel-Catalyzed Carboalkenylation of 1,3-Dienes with Aldehydes and Alkenylzirconium Reagents: Access to Skipped Dienes. Org Lett 2021; 23:535-541. [DOI: 10.1021/acs.orglett.0c04059] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cheng-Gang Wang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
| | - Yunxing Zhang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
| | - Simin Wang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
| | - Bin Chen
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
| | - Yang Li
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
| | - Hai-Liang Ni
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
| | - Yuanji Gao
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
| | - Ping Hu
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
| | - Bi-Qin Wang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
| | - Peng Cao
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China
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24
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Zuo WF, Zhou J, Wu YL, Fang HY, Lang XJ, Li Y, Zhan G, Han B. Synthesis of spiro(indoline-2,3′-hydropyridazine) via an “on-water” [4 + 2] annulation reaction. Org Chem Front 2021. [DOI: 10.1039/d0qo01422b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
An on-water [4 + 2] annulation reaction between 2-methyl-3H-indolium salt and α-bromo N-acyl hydrazone has been developed. The environmentally friendly strategy provides the first facile access to spiro(indoline-2,3'-hydropyridazine) scaffolds.
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Affiliation(s)
- Wei-Fang Zuo
- State Key Laboratory of Southwestern Chinese Medicine Resources
- School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P.R. China
| | - Jin Zhou
- State Key Laboratory of Southwestern Chinese Medicine Resources
- School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P.R. China
| | - Yu-Ling Wu
- State Key Laboratory of Southwestern Chinese Medicine Resources
- School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P.R. China
| | - Hua-Ying Fang
- State Key Laboratory of Southwestern Chinese Medicine Resources
- School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P.R. China
| | - Xing-Jiang Lang
- State Key Laboratory of Southwestern Chinese Medicine Resources
- School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P.R. China
| | - Ya Li
- State Key Laboratory of Southwestern Chinese Medicine Resources
- School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P.R. China
| | - Gu Zhan
- State Key Laboratory of Southwestern Chinese Medicine Resources
- School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P.R. China
| | - Bo Han
- State Key Laboratory of Southwestern Chinese Medicine Resources
- School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P.R. China
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25
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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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26
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Lenhof J, Hutter M, Huch V, Jauch J. Towards the Total Synthesis of Jerangolids – Synthesis of an Advanced Intermediate for the Pharmacophore Substructure. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000586] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Julian Lenhof
- Organic Chemistry II Saarland University P.O. Box 111550 66041 Saarbrücken Germany
| | - Michael Hutter
- Center for Bioinformatics Saarland University P.O. Box 111550 66041 Saarbrücken Germany
| | - Volker Huch
- General and Inorganic Chemistry Saarland University P.O. Box 111550 66041 Saarbrücken Germany
| | - Johann Jauch
- Organic Chemistry II Saarland University P.O. Box 111550 66041 Saarbrücken Germany
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27
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Cusick KD, Widder EA. Bioluminescence and toxicity as driving factors in harmful algal blooms: Ecological functions and genetic variability. HARMFUL ALGAE 2020; 98:101850. [PMID: 33129462 DOI: 10.1016/j.hal.2020.101850] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Revised: 05/29/2020] [Accepted: 06/02/2020] [Indexed: 06/11/2023]
Abstract
Dinoflagellates are an ecologically important group of marine microbial eukaryotes with a remarkable array of adaptive strategies. It is ironic that two of the traits for which dinoflagellates are best known, toxin production and bioluminescence, are rarely linked when considering the ecological significance of either. Although dinoflagellate species that form some of the most widespread and frequent harmful algal blooms (HABs) are bioluminescent, the molecular and eco-evolutionary associations between these two traits has received little attention. Here, the major themes of biochemistry and genetics, ecological functions, signaling mechanisms, and evolution are addressed, with parallels and connections drawn between the two. Of the 17 major classes of dinoflagellate toxins, only two are produced by bioluminescent species: saxitoxin (STX) and yessotoxin. Of these, STX has been extensively studied, including the identification of the STX biosynthetic genes. While numerous theories have been put forward as to the eco-evolutionary roles of both bioluminescence and toxicity, a general consensus is that both function as grazing deterrents. Thus, both bioluminescence and toxicity may aid in HAB initiation as they alleviate grazing pressure on the HAB species. A large gap in our understanding is the genetic variability among natural bloom populations, as both toxic and non-toxic strains have been isolated from the same geographic location. The same applies to bioluminescence, as there exist both bioluminescent and non-bioluminescent strains of the same species. Recent evidence demonstrating that blooms are not monoclonal events necessitates a greater level of understanding as to the genetic variability of these traits among sub-populations as well as the mechanisms by which cells acquire or lose the trait, as sequence analysis of STX+ and STX- species indicate the key gene required for toxicity is lost rather than gained. While the extent of genetic variability for both bioluminescence and toxicity among natural HAB sub-populations remains unknown, it is an area that needs to be explored in order to gain greater insights into the molecular mechanisms and environmental parameters driving HAB evolution.
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Affiliation(s)
- Kathleen D Cusick
- University of Maryland Baltimore County, Department of Biological Sciences, 1000 Hilltop Circle, Baltimore, MD 21250, United States.
| | - Edith A Widder
- Ocean Research and Conservation Association, 1420 Seaway Dr, Fort Pierce, FL 34949, United States.
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28
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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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29
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Kitanosono T, Kobayashi S. Reactions in Water Involving the “On‐Water” Mechanism. Chemistry 2020; 26:9408-9429. [DOI: 10.1002/chem.201905482] [Citation(s) in RCA: 74] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 02/08/2020] [Indexed: 11/07/2022]
Affiliation(s)
- Taku Kitanosono
- Department of ChemistrySchool of ScienceThe University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Shū Kobayashi
- Department of ChemistrySchool of ScienceThe University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan
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30
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Wang S, Arguelles AJ, Tay JH, Hotta M, Zimmerman PM, Nagorny P. Experimental and Computational Studies on Regiodivergent Chiral Phosphoric Acid Catalyzed Cycloisomerization of Mupirocin Methyl Ester. Chemistry 2020; 26:4583-4591. [PMID: 31905253 PMCID: PMC7261366 DOI: 10.1002/chem.201905222] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 01/01/2020] [Indexed: 12/17/2022]
Abstract
This article presents a new strategy for achieving regiocontrol over the endo versus exo modes of cycloisomerizations of epoxide-containing alcohols, which leads to the formation of five- or six-membered cyclic ethers. Unlike traditional methods relying on achiral reagents or enzymes, this approach utilizes chiral phosphoric acids to catalyze the regiodivergent selective formations of either tetrahydrofuran- or tetrahydropyran-containing products. By using methyl ester of epoxide-containing antibiotic mupirocin as the substrate, it is demonstrated that catalytic chiral phosphoric acids (R)-TCYP and (S)-TIPSY could be used to achieve the selective formation of either the six-membered endo product (95:5 r.r.) or the five-membered exo product (77:23 r.r.), correspondingly. This cyclization was found to be unselective under the standard conditions involving various achiral acids, bases, or buffers. The subsequent mechanistic studies using state-of-the-art quantum chemical solutions provided the description of the potential energy surface, which is fully consistent with the experimental observations. Based on these results, highly detailed reaction paths are obtained and a concerted and highly synchronous mechanism is proposed for the formation of both exo and endo products.
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Affiliation(s)
- Sibin Wang
- Chemistry Department, University of Michigan, 930N. University Ave., Ann Arbor, MI, 48109, USA
| | - Alonso J Arguelles
- Eli Lilly and Company, 1500 South Harding Street, Indiana, IN, 46221, USA
| | - Jia-Hui Tay
- Corteva Agriscience, 9330 Zionsville Rd., Indianapolis, IN, 46268, USA
| | - Miyuki Hotta
- Chemistry Department, University of Michigan, 930N. University Ave., Ann Arbor, MI, 48109, USA
| | - Paul M Zimmerman
- Chemistry Department, University of Michigan, 930N. University Ave., Ann Arbor, MI, 48109, USA
| | - Pavel Nagorny
- Chemistry Department, University of Michigan, 930N. University Ave., Ann Arbor, MI, 48109, USA
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31
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Hajra S, Roy S. Feedback Inhibition in Chemical Catalysis Leads the Dynamic Kinetic to Kinetic Resolution in C3-Indolylation of Spiro-epoxyoxindoles. Org Lett 2020; 22:1458-1463. [DOI: 10.1021/acs.orglett.0c00028] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Saumen Hajra
- Center of Biomedical Research, Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow 226014, India
| | - Sayan Roy
- Center of Biomedical Research, Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow 226014, India
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32
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Wan X, Yao G, Liu Y, Chen J, Jiang H. Research Progress in the Biosynthetic Mechanisms of Marine Polyether Toxins. Mar Drugs 2019; 17:E594. [PMID: 31652489 PMCID: PMC6835853 DOI: 10.3390/md17100594] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 10/17/2019] [Accepted: 10/18/2019] [Indexed: 12/28/2022] Open
Abstract
Marine polyether toxins, mainly produced by marine dinoflagellates, are novel, complex, and diverse natural products with extensive toxicological and pharmacological effects. Owing to their harmful effects during outbreaks of marine red tides, as well as their potential value for the development of new drugs, marine polyether toxins have been extensively studied, in terms of toxicology, pharmacology, detection, and analysis, structural identification, as well as their biosynthetic mechanisms. Although the biosynthetic mechanisms of marine polyether toxins are still unclear, certain progress has been made. In this review, research progress and current knowledge on the biosynthetic mechanisms of polyether toxins are summarized, including the mechanisms of carbon skeleton deletion, pendant alkylation, and polyether ring formation, along with providing a summary of mined biosynthesis-related genes. Finally, future research directions and applications of marine polyether toxins are discussed.
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Affiliation(s)
- Xiukun Wan
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
| | - Ge Yao
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
| | - Yanli Liu
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
| | - Jisheng Chen
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
| | - Hui Jiang
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.
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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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Yang J, Ji DW, Hu YC, Min XT, Zhou X, Chen QA. Cobalt-catalyzed hydroxymethylarylation of terpenes with formaldehyde and arenes. Chem Sci 2019; 10:9560-9564. [PMID: 32055328 PMCID: PMC6979501 DOI: 10.1039/c9sc03747k] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 08/26/2019] [Indexed: 01/01/2023] Open
Abstract
A cobalt(iii)-catalyzed C–H activation strategy has been developed to facilitate hydroxymethylarylation of terpenes with formaldehyde and arenes with high chemo- and regio-selectivities.
Terpenes, consisting of isoprene monomer units, represent a family of naturally abundant compounds. The difunctionalization of terpenes is highly appealing yet remains challenging, since the multiple unbiased C
Created by potrace 1.16, written by Peter Selinger 2001-2019
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C bonds of terpenes lead to difficulty in controlling the regioselectivity. Herein, a cobalt(iii)-catalyzed C–H activation strategy has been developed to facilitate hydroxymethylarylation of terpenes with formaldehyde and arenes with high chemo- and regio-selectivities. These (chemo- and regio-) selectivities are governed by the coordination abilities of isoprene, directing groups and the steric effect. This terpene difunctionalization also features high atom and step economy through a C–H addition pathway.
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Affiliation(s)
- Jun Yang
- Institute of Homogeneous Catalysis , College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China . .,Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , P. R. China . ; [http://www.lbcs.dicp.ac.cn]
| | - Ding-Wei Ji
- Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , P. R. China . ; [http://www.lbcs.dicp.ac.cn]
| | - Yan-Cheng Hu
- Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , P. R. China . ; [http://www.lbcs.dicp.ac.cn]
| | - Xiang-Ting Min
- Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , P. R. China . ; [http://www.lbcs.dicp.ac.cn]
| | - Xiangge Zhou
- Institute of Homogeneous Catalysis , College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China .
| | - Qing-An Chen
- Dalian Institute of Chemical Physics , Chinese Academy of Sciences , Dalian 116023 , P. R. China . ; [http://www.lbcs.dicp.ac.cn]
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35
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Development of a continuous flow synthesis of propranolol: tackling a competitive side reaction. J Flow Chem 2019. [DOI: 10.1007/s41981-019-00047-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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36
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Sittihan S, Jamison TF. Total Synthesis of the Marine Ladder Polyether Gymnocin B. J Am Chem Soc 2019; 141:11239-11244. [PMID: 31283211 DOI: 10.1021/jacs.9b04696] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, we report the first total synthesis of marine ladder polyether gymnocin B (1) based on a two-phase strategy. In Phase I, inspired by the proposed biosynthesis, epoxide-opening cascades assemble 10 out of 15 cyclic ether rings making up the molecular core. In the subsequent Phase II, coalescence elevates the molecular complexity further by coupling of these subunits. Our two-phase synthetic approach significantly improved the step efficiency of the synthesis of this class of natural products.
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Affiliation(s)
- Satapanawat Sittihan
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Timothy F Jamison
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
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37
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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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38
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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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39
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Lux MC, Boby ML, Brooks JL, Tan DS. Synthesis of bicyclic ethers by a palladium-catalyzed oxidative cyclization-redox relay-π-allyl-Pd cyclization cascade reaction. Chem Commun (Camb) 2019; 55:7013-7016. [PMID: 31147660 DOI: 10.1039/c9cc03775f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bicyclic ether scaffolds are found in a variety of natural products and are of interest in probe and drug discovery. A palladium-catalyzed cascade reaction has been developed to provide efficient access to these scaffolds from readily available linear diene-diol substrates. A Pd redox-relay process is used strategically to transmit reactivity between an initial oxypalladative cyclization and a subsequent π-allyl-Pd cyclization at remote sites. The reaction affords a variety of bicyclic ether scaffolds with complete diastereoselectivity for cis-ring fusion.
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Affiliation(s)
- Michaelyn C Lux
- Tri-Institutional PhD Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - Melissa L Boby
- Pharmacology Program, Weill Cornell Graduate School of Medical Sciences, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - Joshua L Brooks
- Chemical Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA
| | - Derek S Tan
- Tri-Institutional PhD Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA and Pharmacology Program, Weill Cornell Graduate School of Medical Sciences, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA and Chemical Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA and Tri-Institutional Research Program, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, New York, New York 10065, USA.
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40
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McGeough CP, Strom AE, Jamison TF. Ni-Catalyzed Cross-Electrophile Coupling for the Synthesis of Skipped Polyenes. Org Lett 2019; 21:3606-3609. [PMID: 31046296 DOI: 10.1021/acs.orglett.9b01019] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Skipped polyenes featuring high ( E)-selectivity and varying methyl substitution patterns are synthesized using a nickel-catalyzed cross-coupling reaction between allyl trifluoroacetates and vinyl bromides. The utility of this cross-electrophile coupling is showcased in part by the synthesis of the RST fragment of the marine ladder polyether, maitotoxin. Construction of this fragment is particularly challenging due to the alternating methyl substitution pattern.
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Affiliation(s)
- Catherine P McGeough
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Alexandra E Strom
- 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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41
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Sheng Y, Regner M. Roles of Water Molecules and Counterion on HS - Sensing Reaction Utilizing a Pyrylium Derivative: A Computational Study. J Phys Chem A 2019; 123:3334-3343. [PMID: 30912942 DOI: 10.1021/acs.jpca.9b01288] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this paper, we present a comprehensive computational study on the hydrogen sulfide ion (HS-) sensing mechanism in aqueous solution using pyrylium-thiopyrylium transformation. Explicit water molecules up to three water molecules are considered using supramolecular models. The effect of water bulk solvent is also taken into account according to the polarizable continuum model. Our results demonstrate that water molecules are directly involved in the sensing reactions by altering reaction mechanisms and dramatically lower the activation energies. The most favorable HS- sensing mechanism involves a 10-membered ring transition structure formed by three water molecules and one hydronium. The catalytic effects of water molecule(s) due to the alleviation of ring strain and the stabilization from deprotonated hydronium significantly lower the activation energy. The activation energies in aqueous solution decrease from 40.2 kcal/mol for the hydronium-only-catalyzed reaction to 15.7, 14.8, and 7.4 kcal/mol for one-water-, two-water-, and three-water-catalyzed mechanisms, respectively. In addition, the effect of the counterion tetrafluoroborate (BF4-) on the reaction mechanisms was also investigated. Our results demonstrate that the counterion BF4- most likely behaves as a spectator and has minor influence on the reaction mechanism.
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Affiliation(s)
- Yinghong Sheng
- Department of Chemistry and Physics, College of Arts and Sciences , Florida Gulf Coast University , 10501 FGCU Blvd. South , Fort Myers , Florida 33965 , United States
| | - Matthew Regner
- Department of Chemistry and Physics, College of Arts and Sciences , Florida Gulf Coast University , 10501 FGCU Blvd. South , Fort Myers , Florida 33965 , United States
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42
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Kochi T, Ichinose K, Shigekane M, Hamasaki T, Kakiuchi F. Metal‐Catalyzed Sequential Formation of Distant Bonds in Organic Molecules: Palladium‐Catalyzed Hydrosilylation/Cyclization of 1,
n
‐Dienes by Chain Walking. Angew Chem Int Ed Engl 2019; 58:5261-5265. [DOI: 10.1002/anie.201814558] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Revised: 02/01/2019] [Indexed: 12/12/2022]
Affiliation(s)
- Takuya Kochi
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Kazuya Ichinose
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Masayuki Shigekane
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Taro Hamasaki
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Fumitoshi Kakiuchi
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
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43
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Kochi T, Ichinose K, Shigekane M, Hamasaki T, Kakiuchi F. Metal‐Catalyzed Sequential Formation of Distant Bonds in Organic Molecules: Palladium‐Catalyzed Hydrosilylation/Cyclization of 1,
n
‐Dienes by Chain Walking. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814558] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Takuya Kochi
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Kazuya Ichinose
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Masayuki Shigekane
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Taro Hamasaki
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
| | - Fumitoshi Kakiuchi
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan
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44
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Oishi T. Design and Synthesis of Artificial Ladder-Shaped Polyethers for Exploring Biological Functions. HETEROCYCLES 2019. [DOI: 10.3987/rev-18-sr(f)1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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45
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Jung S, Kang S, Kuwabara J, Yoon HJ. Aziridine-based polyaddition, post-modification, and crosslinking: can aziridine rival epoxide in polymer chemistry? Polym Chem 2019. [DOI: 10.1039/c9py00979e] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Aziridine may help to solve the problems encountered in epoxide-based polymer technologies. This review focuses on recent achievements in aziridine-based polyaddition, post-modification, and cross-linking.
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Affiliation(s)
- Sangmin Jung
- Department of Chemistry
- Korea University
- Seoul
- Korea
| | - Seohyun Kang
- Department of Chemistry
- Korea University
- Seoul
- Korea
| | - Junpei Kuwabara
- Institute of Materials Science
- Graduate School of Pure and Applied Sciences
- Tsukuba Research Center for Energy Materials Science (TREMS)
- University of Tsukuba
- Tsukuba 305-8573
| | - Hyo Jae Yoon
- Department of Chemistry
- Korea University
- Seoul
- Korea
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46
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Deciphering key intermediates in the transformation of carbon dioxide into heterocyclic products. Nat Catal 2018. [DOI: 10.1038/s41929-018-0189-z] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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47
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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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48
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Shimokawa J. Natural Product Synthesis as a Source of Inspiration and Discovery. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.458] [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)
- Jun Shimokawa
- Department of Chemistry, Graduate School of Science, Kyoto University
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49
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Affiliation(s)
- Sukalyan Bhadra
- Inorganic Materials and Catalysis Division, Academy of Scientific and Innovative Research, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar, 364002 Gujarat, India
| | - Hisashi Yamamoto
- Molecular Catalyst Research Center, Chubu University, 1200, Matsumoto-Cho, Kasugai, Aichi 487-8501, Japan
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50
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Studies toward brevisulcenal F via convergent strategies for marine ladder polyether synthesis. Tetrahedron 2018; 74:1111-1122. [PMID: 29479119 DOI: 10.1016/j.tet.2018.01.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Shortly after the initial isolation of marine ladder polyether natural products, biomimetic epoxide-opening cascade reactions were proposed as an efficient strategy for the synthesis of these compounds. However, difficulties in assembling the cascade precursors have limited the realization of these cascades. In this report, we describe strategies that provide convergent access to cascade precursors via regioselective allylation and efficient fragment coupling. We then investigate epoxide-opening cascades promoted by strong bases for the formation of fused tetrahydropyrans. These strategies are evaluated in the context of the synthesis of rings CDEFG of brevisulcenal F.
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