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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Zhao L, Hu P, Tian J, Zhang X, Yang C, Guo L, Xia W. Electrochemical Deconstructive and Ring-Expansion Functionalization of Unstrained Cycloalkanols. Org Lett 2024; 26:4882-4886. [PMID: 38815060 DOI: 10.1021/acs.orglett.4c01337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2024]
Abstract
An efficient and sustainable electrochemical method for the synthesis of cyclic ethers and acyclic aldehydes from alkanols has been reported. This strategy has been successfully applied to cycloalkanols bearing different ring sizes and different types of nucleophiles. In addition, mechanistic investigations show that the reactions undergo sequential processes, including anodic oxidation, β-scission, and nucleophilic addition. This method provides a new synthetic approach to constructing cyclic ethers and terminal aldehydes from cycloalkanols and nucleophiles.
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Affiliation(s)
- Lulu Zhao
- State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China
| | - Pengwei Hu
- State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China
| | - Jian Tian
- State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China
| | - Xiao Zhang
- State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China
| | - Chao Yang
- State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China
| | - Lin Guo
- State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China
| | - Wujiong Xia
- State Key Lab of Urban Water Resource and Environment, School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
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3
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Xu J, Liu B. Metal Free Functionalization of Saturated Heterocycles with Vinylarenes and Pyridine Enabled by Photocatalytic Hydrogen Atom Transfer. Chemistry 2024; 30:e202400612. [PMID: 38566284 DOI: 10.1002/chem.202400612] [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: 02/16/2024] [Revised: 03/25/2024] [Accepted: 04/01/2024] [Indexed: 04/04/2024]
Abstract
Saturated heterocycles are important class of structural scaffolds in small-molecule drugs, natural products, and synthetic intermediates. Here, we disclosed a metal free, mild, and scalable functionalization of saturated heterocycles using vinylarenes as a linchpin approach. Key to success of this transformation is the employing of simple and cheap benzophenone as a hydrogen atom transfer (HAT) catalyst. This operationally robust process was used for the making of diverse functionalized saturated heterocycles. Furthermore, aldehydes, alkane, and alcohol have been functionalized under the optimized conditions. The potential pharmaceutical utility of the procedure has also been demonstrated by late-stage functionalization of bioactive natural compounds and pharmaceutical molecules. Initial mechanism studies and control experiments were performed to elucidate the mechanism of the reactions.
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Affiliation(s)
- Junhua Xu
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, People's Republic of China
| | - Bin Liu
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, People's Republic of China
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4
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Ham JS, Son M, Na CG, Park B, Baik MH, Sarpong R. Construction of Seven-Membered Oxacycles Using a Rh(I)-Catalyzed Cascade C-C Formation/Cleavage of Cyclobutenol Derivatives. J Org Chem 2024; 89:4647-4656. [PMID: 38497619 DOI: 10.1021/acs.joc.3c02914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Herein, we describe the synthesis of substituted oxepane derivatives through the skeletal remodeling of 4-hydroxy-2-cyclobutenones, which are readily prepared from commercially available dialkyl squarates upon their reaction with acrylonitrile. Mechanistically, a Rh(I)-catalyzed C-C bond formation and cleavage cascade is proposed. Specifically, a fused [3.2.0] bicycle is proposed to form from dialkyl squarate-derived cyclobutenols via an unusual Rh(I)-catalyzed intermolecular oxa-Michael addition of a tertiary alcohol with acrylonitrile, followed by an intramolecular conjugate addition/migratory insertion. Subsequent C(sp3)-C(sp3) bond cleavage through a Rh-catalyzed β-carbon elimination is then theorized to furnish the oxepane scaffold. Computational studies support the formation of an intermediate [3.2.0] bicycle but also point to an alternative pathway for the formation of the oxepane products involving a Rh(III) intermediate. Additional studies have shown the overall process to be stereoretentive. The functional groups that are introduced in this process can be leveraged to form fused or bridged ring systems.
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Affiliation(s)
- Jin Su Ham
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Mina Son
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Christina G Na
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Bohyun Park
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Mu-Hyun Baik
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, Republic of Korea
| | - Richmond Sarpong
- Department of Chemistry, University of California, Berkeley, California 94720, United States
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5
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Wu Y, Zhang W, Ma S, Song C, Chang J. Copper-Catalyzed Synthesis of N-Fused Quinolines via C(sp 3)-H Activation-Radical Addition-Cyclization Cascade. J Org Chem 2023. [PMID: 38012068 DOI: 10.1021/acs.joc.3c01812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
A novel copper-catalyzed cyclization reaction for the synthesis of pyrazolo[1,5-a]quinoline, triazolo[1,5-a]quinoline, and pyrrolo[1,2-a]quinoline derivatives is described. The process is initiated by di-tert-butyl peroxide-mediated C(sp3)-H activation to generate the α-functionalized radical, which supervenes a cascade radical addition/cyclization sequence to access the N-fused quinolines in good yields with broad functional group tolerance.
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Affiliation(s)
- Yangang Wu
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Wen Zhang
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Shiyu Ma
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Chuanjun Song
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
| | - Junbiao Chang
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
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6
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Yu H, Xu F. Non-noble metal-catalyzed cross-dehydrogenation coupling (CDC) involving ether α-C(sp 3)-H to construct C-C bonds. Beilstein J Org Chem 2023; 19:1259-1288. [PMID: 37701303 PMCID: PMC10494247 DOI: 10.3762/bjoc.19.94] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 08/23/2023] [Indexed: 09/14/2023] Open
Abstract
Ether derivatives are widespread as essential building blocks in various drugs, natural products, agrochemicals, and materials. Modern economy requires developing green strategies with improved efficiency and reduction of waste. Due to its atom and step-economy, the cross-dehydrogenative coupling (CDC) reaction has become a major strategy for ether functionalization. This review covers C-H/C-H cross-coupling reactions of ether derivatives with various C-H bond substrates via non-noble metal catalysts (Fe, Cu, Co, Mn, Ni, Zn, Y, Sc, In, Ag). We discuss advances achieved in these CDC reactions and hope to attract interest in developing novel methodologies in this field of organic chemistry.
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Affiliation(s)
- Hui Yu
- Department of Pharmacy, Shi zhen College of Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou 550200, P. R. China
| | - Feng Xu
- School of Mathematics and Information Science, Guiyang University, Guiyang, Guizhou 550005, P. R. China
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7
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Yang Q, Wang B, Wu M, Lei YZ. Recent Developments in Direct C–H Functionalization of Quinoxalin-2(1H)-Ones via Multi-Component Tandem Reactions. Molecules 2023; 28:molecules28062513. [PMID: 36985484 PMCID: PMC10052782 DOI: 10.3390/molecules28062513] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 02/25/2023] [Accepted: 03/06/2023] [Indexed: 03/12/2023] Open
Abstract
The direct C–H multifunctionalization of quinoxalin-2(1H)-ones via multicomponent reactions has attracted considerable interest due to their diverse biological activities and chemical profile. This review will focus on recent achievements. It mainly covers reaction methods for the simultaneous introduction of C–C bonds and C–RF/C/O/N/Cl/S/D bonds into quinoxalin-2(1H)-ones and their reaction mechanisms. Meanwhile, future developments of multi-component reactions of quinoxalin-2(1H)-ones are envisaged, such as the simultaneous construction of C–C and C–B/SI/P/F/I/SE bonds through multi-component reactions; the construction of fused ring and macrocyclic compounds; asymmetric synthesis; green chemistry; bionic structures and other fields. The aim is to enrich the methods for the reaction of quinoxalin-2(1H)-ones at the C3 position, which have rich applications in materials chemistry and pharmaceutical pharmacology.
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Affiliation(s)
- Qiming Yang
- Guizhou Provincial Key Laboratory of Coal Clean Utilization, School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004, China
- Henan Key Laboratory of New Optoelectronic Functional Materials, College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, China
- Correspondence: (Q.Y.); (Y.-Z.L.)
| | - Biao Wang
- Guizhou Provincial Key Laboratory of Coal Clean Utilization, School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004, China
| | - Mian Wu
- Henan Key Laboratory of New Optoelectronic Functional Materials, College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, China
| | - Yi-Zhu Lei
- Guizhou Provincial Key Laboratory of Coal Clean Utilization, School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004, China
- Correspondence: (Q.Y.); (Y.-Z.L.)
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8
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Zheng YN, Cai XE, Wu HL, Zhou Y, Tian WC, Ruan Y, Liu H, Wei WT. Metal- and Base-Free Radical Cascade Cyclization/Hydrolysis of CN-Containing 1,6-Enynes with Ethers to Access Polyheterocycles. Chem Asian J 2023; 18:e202201149. [PMID: 36550634 DOI: 10.1002/asia.202201149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/21/2022] [Accepted: 12/22/2022] [Indexed: 12/24/2022]
Abstract
A convenient and straightforward approach for the radical cascade cyclization/hydrolysis of CN-containing 1,6-enynes with simple ethers under metal- and base-free conditions is described. This strategy provides a variety of valuable ethers-substituted polyheterocycles via the construction of three C-C bonds, one C=O bond, and two new six-membered rings within a single procedure. The resulting products can smoothly undergo follow-up conversions to various useful scaffolds. The methodology shows excellent functional group tolerance, high step- and atom- economy, and mild reaction conditions, which can be further scaled up to gram quantity in a satisfactory yield.
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Affiliation(s)
- Yan-Nan Zheng
- School of Materials Science and Chemical Engineering, Ningbo University, 315211, Ningbo, Zhejiang, P. R. China
| | - Xue-Er Cai
- School of Materials Science and Chemical Engineering, Ningbo University, 315211, Ningbo, Zhejiang, P. R. China
| | - Hong-Li Wu
- School of Materials Science and Chemical Engineering, Ningbo University, 315211, Ningbo, Zhejiang, P. R. China
| | - Yu Zhou
- School of Materials Science and Chemical Engineering, Ningbo University, 315211, Ningbo, Zhejiang, P. R. China
| | - Wen-Chan Tian
- School of Materials Science and Chemical Engineering, Ningbo University, 315211, Ningbo, Zhejiang, P. R. China
| | - Yiping Ruan
- School of Materials Science and Chemical Engineering, Ningbo University, 315211, Ningbo, Zhejiang, P. R. China
| | - Hongxin Liu
- College of Chemistry and Materials Engineering, Wenzhou University, 325035, Wenzhou, P. R. China
| | - Wen-Ting Wei
- School of Materials Science and Chemical Engineering, Ningbo University, 315211, Ningbo, Zhejiang, P. R. China
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9
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Zhang TS, Song SQ, Qi MJ, Hao WJ, Jiang B. Photocatalytic annulative trifluoromethyletherification of 1,6-enynes for accessing 1-indanones. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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10
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Shen YB, Hu F, Li SS. Advances in α-C(sp3)–H functionalization of ethers via cascade [1,n]-hydride transfer/cyclization. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133089] [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]
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11
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Qin W, Liu Y, Yan H. Enantioselective Synthesis of Atropisomers via Vinylidene ortho-Quinone Methides (VQMs). Acc Chem Res 2022; 55:2780-2795. [PMID: 36121104 DOI: 10.1021/acs.accounts.2c00486] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Atropisomers, arising from conformational restriction, are inherently chiral due to the intersecting dissymmetric planes. Since there are numerous applications of enantiopure atropisomers in catalyst design, drug discovery, and material science, the asymmetric preparation of these highly prized molecules has become a flourishing field in synthetic chemistry. A number of catalysts, synthetic procedures, and novel concepts have been developed for the manufacture of the atropisomeric molecules. However, due to the intrinsic properties of different types of atropisomers featuring biaryl, hetero-biaryl, or non-biaryl architectures, only very few methods pass the rigorous inspection and are considered generally applicable. The development of a broadly applicable synthetic strategy for various atropisomers is a challenge. In this Account, we summarize our recent studies on the enantioselective synthesis of atropisomers using the vinylidene ortho-quinone methides (VQMs) as pluripotent intermediates.The most appealing features of VQMs are the disturbed aromaticity and axial chirality of the allene fragment. At the outset, the applications of VQMs in organic synthesis have been neglected due to their principal liabilities: ephemeral nature, extraordinary reactivity, and multireaction sites. The domestication of this transient intermediate was demonstrated by in situ catalytic asymmetric generation of VQMs, and the reactivity and selectivity were fully explored by judiciously modifying precursors and tuning catalytic systems. A variety of axially chiral heterocycles were achieved through five-, six-, seven- and nine-membered ring formation of VQM intermediates with different kinds of branched nucleophilic functional groups. The axially chiral C-N axis could be constructed from VQM intermediates via N-annulation or desymmetrization of preformed C-N scaffolds. We take advantage of the high electrophilicity of VQMs toward a series of sulfur and carbon based nucleophiles leading to atropisomeric vinyl arenes. Furthermore, chiral helical compounds were realized by cycloaddition or consecutive annulation of VQM intermediates. These achievements demonstrated that the VQMs could work as a nuclear parent for the collective synthesis of distinct and complex optically active atropisomers. Recently, we have realized the isolation and structural characterization of the elusive VQMs, which were questioned as putative intermediates for decades. The successful isolation of VQMs provided direct evidence for their existence and an unprecedented opportunity to directly investigate their reactivity. The good thermal stability and reserved reactivity of the isolated VQMs demonstrated their great potential as synthetic reagents and expanded the border of VQM chemistry.
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Affiliation(s)
- Wenling Qin
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Yidong Liu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Hailong Yan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Chemical Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
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12
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Park SH, Jang J, Shin K, Kim H. Electrocatalytic Radical-Polar Crossover Hydroetherification of Alkenes with Phenols. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Steve H Park
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Jieun Jang
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Kwangmin Shin
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyunwoo Kim
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
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13
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Li H, Chen L, Wang T, Xiong F. Synthesis of Coumarin 3‐aldehyde Derivatives via Photocatalytic Cascade Radical Cyclization‐Hydrolysis. ChemistrySelect 2022. [DOI: 10.1002/slct.202200822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Haiyan Li
- College of Chemistry and Chemical Engineering Jiangxi Normal University Nanchang 330022 P. R. China
| | - Long Chen
- College of Chemistry and Chemical Engineering Jiangxi Normal University Nanchang 330022 P. R. China
| | - Tao Wang
- College of Chemistry and Chemical Engineering Jiangxi Normal University Nanchang 330022 P. R. China
- National Research Center for Carbohydrate Synthesis and Jiangxi Provincial Key Laboratory of Chemical Biology Jiangxi Normal University Nanchang 330022 P. R. China
| | - Fei Xiong
- College of Chemistry and Chemical Engineering Jiangxi Normal University Nanchang 330022 P. R. China
- National Research Center for Carbohydrate Synthesis and Jiangxi Provincial Key Laboratory of Chemical Biology Jiangxi Normal University Nanchang 330022 P. R. China
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14
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Shennan BDA, Berheci D, Crompton JL, Davidson TA, Field JL, Williams BA, Dixon DJ. Branching out: redox strategies towards the synthesis of acyclic α-tertiary ethers. Chem Soc Rev 2022; 51:5878-5929. [PMID: 35770619 DOI: 10.1039/d1cs00669j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Acyclic α-tertiary ethers represent a highly prevalent functionality, common to high-value bioactive molecules, such as pharmaceuticals and natural products, and feature as crucial synthetic handles in their construction. As such their synthesis has become an ever-more important goal in synthetic chemistry as the drawbacks of traditional strong base- and acid-mediated etherifications have become more limiting. In recent years, the generation of highly reactive intermediates via redox approaches has facilitated the synthesis of highly sterically-encumbered ethers and accordingly these strategies have been widely applied in α-tertiary ether synthesis. This review summarises and appraises the state-of-the-art in the application of redox strategies enabling acyclic α-tertiary ether synthesis.
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Affiliation(s)
- Benjamin D A Shennan
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Diana Berheci
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Jessica L Crompton
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Timothy A Davidson
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Joshua L Field
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Benedict A Williams
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Darren J Dixon
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
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15
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Wang L, Chen B, Wu X. Cobalt‐Catalyzed Direct Aminocarbonylation of Ethers: Efficient Access to α‐Amide Substituted Ether Derivatives. Angew Chem Int Ed Engl 2022; 61:e202203797. [DOI: 10.1002/anie.202203797] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Indexed: 12/14/2022]
Affiliation(s)
- Le‐Cheng Wang
- Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian Liaoning China
- Leibniz-Institut für Katalyse e.V. 18059 Rostock Germany
| | - Bo Chen
- Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian Liaoning China
| | - Xiao‐Feng Wu
- Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian Liaoning China
- Leibniz-Institut für Katalyse e.V. 18059 Rostock Germany
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16
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Wang L, Chen B, Wu X. Cobalt‐Catalyzed Direct Aminocarbonylation of Ethers: Efficient Access to α‐Amide Substituted Ether Derivatives. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Le‐Cheng Wang
- Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian Liaoning China
- Leibniz-Institut für Katalyse e.V. 18059 Rostock Germany
| | - Bo Chen
- Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian Liaoning China
| | - Xiao‐Feng Wu
- Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian Liaoning China
- Leibniz-Institut für Katalyse e.V. 18059 Rostock Germany
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17
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Siddique Ahmad M, Shafiq Z, Meguellati K. Cu(I)-catalyzed cross dehydrogenative coupling (CDC) of ethers and substituted styrenes. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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Wang Y, He Q, Cao Z, Wang P, Chen G, Beller M. Hypervalent-iodine promoted selective cleavage of C(sp 3)–C(sp 3) bonds in ethers. Org Chem Front 2022. [DOI: 10.1039/d2qo01114j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A visible-light-promoted and radical-mediated strategy for the site-specific cleavage of C(sp3)–C(sp3) bonds in ethers is reported.
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Affiliation(s)
- Yaxin Wang
- College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
- Leibniz-Institute for Catalysis, Albert-Einstein-Str. 29a, Rostock 18059, Germany
| | - Qin He
- College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Zehui Cao
- College of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Peng Wang
- Leibniz-Institute for Catalysis, Albert-Einstein-Str. 29a, Rostock 18059, Germany
| | - Gong Chen
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
| | - Matthias Beller
- Leibniz-Institute for Catalysis, Albert-Einstein-Str. 29a, Rostock 18059, Germany
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19
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Xu Y, Wu Z, Wu X, Zhu C. Transition-Metal Free Radical-Mediated C—H Bond Alkynylation and Allylation of Ethers, Aldehydes and Amides. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202207014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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20
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Sakai T, Mizuno S, Sone A, Hori Y, Yamazaki W, Takazawa K, Mori Y. Biomimetic Construction of a syn-2,7-Dimethyloxepane Ring via 7- Endo Cyclization. J Org Chem 2021; 87:579-594. [PMID: 34958571 DOI: 10.1021/acs.joc.1c02600] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
syn-2,7-Dimethyloxepane is a unique structure observed in natural ladder-shaped polycyclic ethers (LSPs), such as Caribbean ciguatoxins, gymnocin-B, and brevisulcenal-F that exhibit potent biological activities. Thus, the successful construction of this seven-membered ring is desirable, but its ring strain and the 1,3-repulsion between its two methyl groups makes this process difficult. Herein, we prepared syn-2,7-dimethyloxepanes via 7-endo cyclizations of vinyl epoxides that break Baldwin's rules. Such a biomimetic approach to syn-2,7-dimethyloxepanes has not yet been reported; however, we achieved this challenging cyclization with the aid of a cis-olefin tether and an unsubstituted vinyl group. The NO-ring fragment of gymnocin-B was also prepared from one of these 7-endo cyclized products, demonstrating the potential application of this strategy in constructing bioactive LSPs.
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Affiliation(s)
- Takeo Sakai
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Sae Mizuno
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Akitaka Sone
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Yasuko Hori
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Wakana Yamazaki
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Keisuke Takazawa
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Yuji Mori
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
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21
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Qiao J, Song Z, Huang C, Ci R, Liu Z, Chen B, Tung C, Wu L. Direct, Site‐Selective and Redox‐Neutral α‐C−H Bond Functionalization of Tetrahydrofurans via Quantum Dots Photocatalysis. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109849] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Jia Qiao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Future Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Zi‐Qi Song
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Future Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Cheng Huang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Future Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Rui‐Nan Ci
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Future Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Zan Liu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Future Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Bin Chen
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Future Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Chen‐Ho Tung
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Future Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Li‐Zhu Wu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 P. R. China
- School of Future Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
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22
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Niu B, Blackburn BG, Sachidanandan K, Cooke MV, Laulhé S. Metal-free visible-light-promoted C(sp 3)-H functionalization of aliphatic cyclic ethers using trace O 2. GREEN CHEMISTRY : AN INTERNATIONAL JOURNAL AND GREEN CHEMISTRY RESOURCE : GC 2021; 23:9454-9459. [PMID: 37180766 PMCID: PMC10181853 DOI: 10.1039/d1gc03482k] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Presented is a light-promoted C-C bond forming reaction yielding sulfone and phosphate derivatives at room temperature in the absence of metals or photoredox catalyst. This transformation proceeds in neat conditions through an auto-oxidation mechanism which is maintained through the leaching of trace amounts of O2 as sole green oxidant.
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Affiliation(s)
- Ben Niu
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Bryan G Blackburn
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Krishnakumar Sachidanandan
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Maria Victoria Cooke
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Sébastien Laulhé
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
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23
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Jia S, Chang Y, Tian Y, Mao H, Qin W, Wang P, Yan H. Organocatalytic cascade reactions for multi-functionalized chiral cyclic ethers through vinylidene ortho-quinone methides. Chem Commun (Camb) 2021; 57:11334-11337. [PMID: 34642730 DOI: 10.1039/d1cc05340j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
An organocatalytic approach to installing various alcohols into the carbonyl of α,β-unsaturated ketones mediated by VQM intermediates was achieved, followed by dearomatization to provide the stereo-defined cyclic ethers via a cascade process. Along with the transformations, this strategy affords efficient access to the underexplored chiral cyclic ether chemospace.
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Affiliation(s)
- Shiqi Jia
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P. R. China.
| | - Yu Chang
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P. R. China.
| | - Yuhong Tian
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P. R. China.
| | - Hui Mao
- College of Pharmacy, Jinhua Polytechnic, Jinhua, Zhejiang Province 321007, P. R. China
| | - Wenling Qin
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P. R. China.
| | - Pengfei Wang
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P. R. China.
| | - Hailong Yan
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 401331, P. R. China.
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24
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Qiao J, Song ZQ, Huang C, Ci RN, Liu Z, Chen B, Tung CH, Wu LZ. Direct, Site-Selective and Redox-Neutral α-C-H Bond Functionalization of Tetrahydrofurans via Quantum Dots Photocatalysis. Angew Chem Int Ed Engl 2021; 60:27201-27205. [PMID: 34536248 DOI: 10.1002/anie.202109849] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 09/16/2021] [Indexed: 11/06/2022]
Abstract
As one of the most ubiquitous bulk reagents available, the intrinsic chemical inertness of tetrahydrofuran (THF) makes direct and site-selective C(sp3 )-H bond activation difficult, especially under redox neutral condition. Here, we demonstrate that semiconductor quantum dots (QDs) can activate α-C-H bond of THF via forming QDs/THF conjugates. Under visible light irradiation, the resultant alkoxyalkyl radical directly engages in radical cross-coupling with α-amino radical from amino C-H bonds or radical addition with alkene or phenylacetylene, respectively. In contrast to stoichiometric oxidant or hydrogen atom transfer reagents required in previous studies, the scalable benchtop approach can execute α-C-H bond activation of THF only by a QD photocatalyst under redox-neutral condition, thus providing a broad of value added chemicals starting from bulk THFs reagent.
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Affiliation(s)
- Jia Qiao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Zi-Qi Song
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Cheng Huang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Rui-Nan Ci
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Zan Liu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Bin Chen
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Chen-Ho Tung
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Li-Zhu Wu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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25
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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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26
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Ming S, Qurban S, Du Y, Su W. Asymmetric Synthesis of Multi-Substituted Tetrahydrofurans via Palladium/Rhodium Synergistic Catalyzed [3+2] Decarboxylative Cycloaddition of Vinylethylene Carbonates. Chemistry 2021; 27:12742-12746. [PMID: 34197006 DOI: 10.1002/chem.202102024] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Indexed: 11/10/2022]
Abstract
Unlike the comprehensive development of tandem multi-metallic catalysis, bimetallic synergistic catalysis has been challenging to achieve high stereoselectivity with the generation of multi-stereogenic centers. Herein, an efficient synergistic catalysis for the diastereo- and enantioselective synthesis of multi-substituted tetrahydrofuran derivatives has been developed. Under mild reaction conditions, a series of target molecules with three consecutive stereocenters were synthesized by a palladium(0)/rhodium(III) bimetal-catalyzed asymmetric decarboxylative [3+2]-cycloaddition of vinylethylene carbonates with α,β-unsaturated carbonyl compounds. The corresponding adducts were obtained with moderate to high yields (67 %∼98 %) and excellent stereoselectivities (>20 : 1 d.r., up to 99 % ee).
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Affiliation(s)
- Siliang Ming
- College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China
| | - Saira Qurban
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002, P. R. China
| | - Yu Du
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002, P. R. China
| | - Weiping Su
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002, P. R. China.,College of Chemistry, Fuzhou University, Fuzhou, 350108, P. R. China
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27
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Nicolaou KC, Pan S, Shelke Y, Das D, Ye Q, Lu Y, Sau S, Bao R, Rigol S. A Reverse Approach to the Total Synthesis of Halichondrin B. J Am Chem Soc 2021; 143:9267-9276. [PMID: 34105959 DOI: 10.1021/jacs.1c05270] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A new strategy is described for the total synthesis of halichondrin B featuring reversal of the sequential construction of a number of its cyclic ethers from the classical approach by instead forming C-O bonds first followed by C-C bond formation. Employing the Nicholas reaction to generate linear ethers as precursors for the total synthesis of halichondrin B and other members of the halichondrin and eribulin families of compounds, this novel approach provides new opportunities for the development of improved syntheses of these complex and valuable compounds. In this Article, we report the syntheses of defined fragments I, MN, EFG, and A. Fragments I and MN were then coupled and elaborated to advanced intermediate IJKLMN, which was joined with fragment EFG to afford, after appropriate elaboration and macrolactonization, the more advanced polycyclic intermediate EFGHIJKLMN. Elaboration of the latter and coupling with fragment A followed by further functionalization completed the total synthesis of halichondrin B through a short and convergent pathway.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Saiyong Pan
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Yogesh Shelke
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Dipendu Das
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Qiuji Ye
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Yong Lu
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Susanta Sau
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Ruiyang Bao
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Stephan Rigol
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6100 Main Street, Houston, Texas 77005, United States
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28
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Mitsudo K, Kobashi Y, Nakata K, Kurimoto Y, Sato E, Mandai H, Suga S. Cu-Catalyzed Dehydrogenative C-O Cyclization for the Synthesis of Furan-Fused Thienoacenes. Org Lett 2021; 23:4322-4326. [PMID: 34029106 DOI: 10.1021/acs.orglett.1c01256] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first Cu-catalyzed dehydrogenative C-O cyclization for the synthesis of furan-fused thienoacenes is described. A variety of heteroacenes including a thieno[3,2-b]furan or a thieno[2,3-b]furan skeleton were synthesized by intramolecular C-H/O-H coupling. The use of a mixed solvent of N-methyl-2-pyrrolidone, ethylene glycol monomethyl ether, and toluene was essential for suppressing side reactions and efficiently promoting the reaction. Double C-O cyclization was also conducted to afford highly π-expanded furan-fused thienoacenes.
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Affiliation(s)
- Koichi Mitsudo
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Yoshiaki Kobashi
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Kaito Nakata
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Yuji Kurimoto
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Eisuke Sato
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Hiroki Mandai
- Department of Pharmacy, Faculty of Pharmacy, Gifu University of Medical Science, 4-3-3 Nijigaoka, Kani, Gifu 509-0293, Japan
| | - Seiji Suga
- Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
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29
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Qiu ZW, Li BQ, Liu HF, Zhu ZQ, Pan HP, Feng N, Ma AJ, Peng JB, Zhang XZ. Formal (3 + 4)-Annulation of Propargylic p-Quinone Methides with 2-Indolylmethanols: Synthesis of Polysubstituted Indole-Fused Oxepines. J Org Chem 2021; 86:7490-7499. [PMID: 34004118 DOI: 10.1021/acs.joc.1c00484] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A novel Brønsted acid catalyzed 1,8-addition mediated (3 + 4)-annulation of in situ generated propargylic p-quinone methides with 2-indolylmethanols is described. This method provides a convenient and mild approach to structurally interesting and synthetically important polysubstituted indole-fused oxepines in high yields. Moreover, 2-indolylmethanols as four-atom synthons in the (3 + 4)-annulations under Brønsted acid conditions have been explored for the first time.
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Affiliation(s)
- Zong-Wang Qiu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Bao Qiong Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Hong-Fu Liu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Zhi-Qiang Zhu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Han-Peng Pan
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Na Feng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Ai-Jun Ma
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Jin-Bao Peng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
| | - Xiang-Zhi Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, P.R. China
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30
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Martínez-Gualda AM, Domingo-Legarda P, Rigotti T, Díaz-Tendero S, Fraile A, Alemán J. Asymmetric [2+2] photocycloaddition via charge transfer complex for the synthesis of tricyclic chiral ethers. Chem Commun (Camb) 2021; 57:3046-3049. [PMID: 33625423 DOI: 10.1039/d1cc00035g] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The asymmetric synthesis of chiral polycyclic ethers by an intramolecular [2+2] photocycloaddition is described. This process proceeded through a photocatalytically active iminium ion-based charge transfer (CT) complex under visible light irradiation. In this way a stereocontrolled [2+2] photocycloaddition is enabled leading to tricyclic products with good enantiomeric ratios.
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31
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Sakurai S, Kano T, Maruoka K. Cu-Catalyzed O-alkylation of phenol derivatives with alkylsilyl peroxides. Chem Commun (Camb) 2021; 57:81-84. [DOI: 10.1039/d0cc07305a] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A Cu-catalyzed O-alkylation of phenol derivatives using alkylsilyl peroxides as alkyl radical precursors is described.
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Affiliation(s)
- Shunya Sakurai
- Department of Chemistry
- Graduate School of Science
- Kyoto University
- Sakyo
- Japan
| | - Taichi Kano
- Department of Chemistry
- Graduate School of Science
- Kyoto University
- Sakyo
- Japan
| | - Keiji Maruoka
- Department of Chemistry
- Graduate School of Science
- Kyoto University
- Sakyo
- Japan
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32
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Peng T, Zhu H, Xu Y, Li D, Wang Y, Wang L, Liu X, Yang D, Wang R. Synergistic zinc catalyst mediated oxa-Michael kinetic resolution reaction. Org Chem Front 2021. [DOI: 10.1039/d1qo00402f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An oxa-Michael kinetic resolution reaction is developed to efficiently construct complexed polycyclic motifs by developing novel bifunctional zinc catalysts.
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Affiliation(s)
- Tianyu Peng
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- Institute of Drug Design & Synthesis
- Department of Pharmacology
- School of Basic Medical Sciences
- Lanzhou University
| | - Haiyong Zhu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- Institute of Drug Design & Synthesis
- Department of Pharmacology
- School of Basic Medical Sciences
- Lanzhou University
| | - Yingfan Xu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- Institute of Drug Design & Synthesis
- Department of Pharmacology
- School of Basic Medical Sciences
- Lanzhou University
| | - Dan Li
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- Institute of Drug Design & Synthesis
- Department of Pharmacology
- School of Basic Medical Sciences
- Lanzhou University
| | - Yuan Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- Institute of Drug Design & Synthesis
- Department of Pharmacology
- School of Basic Medical Sciences
- Lanzhou University
| | - Linqing Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- Institute of Drug Design & Synthesis
- Department of Pharmacology
- School of Basic Medical Sciences
- Lanzhou University
| | - Xin Liu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- Institute of Drug Design & Synthesis
- Department of Pharmacology
- School of Basic Medical Sciences
- Lanzhou University
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- Institute of Drug Design & Synthesis
- Department of Pharmacology
- School of Basic Medical Sciences
- Lanzhou University
| | - Rui Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- Institute of Drug Design & Synthesis
- Department of Pharmacology
- School of Basic Medical Sciences
- Lanzhou University
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33
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Synthesis of Polycyclic Ether-Benzopyrans and In Vitro Inhibitory Activity against Leishmania tarentolae. Molecules 2020; 25:molecules25225461. [PMID: 33233418 PMCID: PMC7700287 DOI: 10.3390/molecules25225461] [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: 10/26/2020] [Revised: 11/14/2020] [Accepted: 11/18/2020] [Indexed: 11/21/2022] Open
Abstract
Construction of a focused library of polycyclic ether-benzopyrans was undertaken in order to discover new therapeutic compounds that affect Leishmania growth and infectivity. This is especially of interest since there are few drug therapies for leishmaniasis that do not have serious drawbacks such high cost, side effects, and emerging drug resistance. The construction of these polycyclic ether-benzopyrans utilized an acetoxypyranone-alkene [5+2] cycloaddition and the Suzuki-Miyaura cross-coupling. The multi-gram quantity of the requisite aryl bromide was obtained followed by effective Pd-catalyzed coupling with boronic acid derivatives. Compounds were tested in vitro using the parasitic protozoan, Leishmania tarentolae. Effects of concentration, time, and exposure to light were evaluated. In addition, the effects on secreted acid phosphatase activity and nitric oxide production were investigated, since both have been implicated in parasite infectivity. The data presented herein are indicative of disruption of the Leishmania tarentolae and thus provide impetus for the development and testing of a more extensive library.
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34
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Oishi T. Structure Determination, Chemical Synthesis, and Evaluation of Biological Activity of Super Carbon Chain Natural Products. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200151] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Tohru Oishi
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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35
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Sun S, Yang Y, Zhao R, Zhang D, Liu L. Site- and Enantiodifferentiating C(sp 3)-H Oxidation Enables Asymmetric Access to Structurally and Stereochemically Diverse Saturated Cyclic Ethers. J Am Chem Soc 2020; 142:19346-19353. [PMID: 33140964 DOI: 10.1021/jacs.0c09636] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A manganese-catalyzed site- and enantiodifferentiating oxidation of C(sp3)-H bonds in saturated cyclic ethers has been described. The mild and practical method is applicable to a range of tetrahydrofurans, tetrahydropyrans, and medium-sized cyclic ethers with multiple stereocenters and diverse substituent patterns in high efficiency with extremely efficient site- and enantiodiscrimination. Late-stage application in complex biological active molecules was further demonstrated. Mechanistic studies by combined experiments and computations elucidated the reaction mechanism and origins of stereoselectivity. The ability to employ ether substrates as the limiting reagent, together with a broad substrate scope, and a high level of chiral recognition, represent a valuable demonstration of the utility of asymmetric C(sp3)-H oxidation in complex molecule synthesis.
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Affiliation(s)
- Shutao Sun
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.,School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
| | - Yiying Yang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Ran Zhao
- School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
| | - Dongju Zhang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Lei Liu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.,School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
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36
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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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37
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Rivero AR, Fodran P, Ondrejková A, Wallentin CJ. Alcohol Etherification via Alkoxy Radicals Generated by Visible-Light Photoredox Catalysis. Org Lett 2020; 22:8436-8440. [PMID: 33040526 PMCID: PMC7653678 DOI: 10.1021/acs.orglett.0c03058] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
![]()
A mechanistically divergent method
is described that, employing
a commercially available hypervalent iodine(III) reagent, generates
alkoxy radicals from 1°, 2°, and 3° alcohols and allows
their use in the functionalization of C(sp3)–H and
C(sp2)–H bonds. This visible-light photoredox catalysis
produces alkyl ethers via 1,5/6-hydrogen atom transfer or aryl ethers
via 1,5-addition. This mild methodology provides a practical strategy
for the synthesis of acetals, orthoesters, tetrahydrofurans, and chromanes.
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Affiliation(s)
- Alexandra R Rivero
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemigården 4, 412 96 Gothenburg, Sweden
| | - Peter Fodran
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemigården 4, 412 96 Gothenburg, Sweden
| | - Alica Ondrejková
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemigården 4, 412 96 Gothenburg, Sweden
| | - Carl-Johan Wallentin
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemigården 4, 412 96 Gothenburg, Sweden
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38
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Hasanov HH, Ivanov IK, Christov VC. Bifunctionalized allenes. Part XXIV. Competitive electrophilic cyclization of 5-(dimethoxyphosphoryl)-alka-3,4-dienoates leading to 2,5-dihydro-1, 2-oxaphospholes and 5,6-dihydro-2 H-pyranes. PHOSPHORUS SULFUR 2020. [DOI: 10.1080/10426507.2020.1759063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Hasan H. Hasanov
- Department of Chemistry, Faculty of Natural Sciences, Konstantin Preslavsky University of Shumen, Shumen, Bulgaria
| | - Ivaylo K. Ivanov
- Department of Chemistry, Faculty of Natural Sciences, Konstantin Preslavsky University of Shumen, Shumen, Bulgaria
| | - Valerij Ch. Christov
- Department of Chemistry, Faculty of Natural Sciences, Konstantin Preslavsky University of Shumen, Shumen, Bulgaria
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39
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Taking electrodecarboxylative etherification beyond Hofer-Moest using a radical C-O coupling strategy. Nat Commun 2020; 11:4407. [PMID: 32879323 PMCID: PMC7468261 DOI: 10.1038/s41467-020-18275-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 08/12/2020] [Indexed: 11/08/2022] Open
Abstract
Established electrodecarboxylative etherification protocols are based on Hofer-Moest-type reaction pathways. An oxidative decarboxylation gives rise to radicals, which are further oxidised to carbocations. This is possible only for benzylic or otherwise stabilised substrates. Here, we report the electrodecarboxylative radical-radical coupling of lithium alkylcarboxylates with 1-hydroxybenzotriazole at platinum electrodes in methanol/pyridine to afford alkyl benzotriazole ethers. The substrate scope of this electrochemical radical coupling extends to primary and secondary alkylcarboxylates. The benzotriazole products easily undergo reductive cleavage to the alcohols. They can also serve as synthetic hubs to access a wide variety of functional groups. This reaction prototype demonstrates that electrodecarboxylative C-O bond formation can be taken beyond the intrinsic substrate limitations of Hofer-Moest mechanisms.
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40
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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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41
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Katahara S, Takahashi T, Nomura K, Uchiyama M, Sato T, Chida N. Copper-Catalyzed Electrophilic Etherification of Arylboronic Esters with Isoxazolidines. Chem Asian J 2020; 15:1869-1872. [PMID: 32352205 DOI: 10.1002/asia.202000270] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 04/29/2020] [Indexed: 11/10/2022]
Abstract
A copper-catalyzed electrophilic etherification of arylboronic esters is reported. Isoxazolidines are utilized as easily available and stable [RO]+ surrogates to give 1,3-amino aryl ethers. The O-selective arylation of isoxazolidines takes place without causing competitive N-arylation. In contrast to previously reported anionic conditions, our copper-catalyzed conditions are mild enough to achieve high functional group tolerance. Preliminary mechanistic studies and DFT calculations support that the reaction proceeds via a transmetalation/oxidative addition pathway, followed by a Lewis acid-promoted reductive elimination to induce the crucial O-selectivity.
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Affiliation(s)
- Seiya Katahara
- Department of Applied Chemistry Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Tenga Takahashi
- Department of Applied Chemistry Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Kengo Nomura
- Department of Applied Chemistry Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Masanobu Uchiyama
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.,Cluster of Pioneering Research (CPR), Advanced Elements Chemistry LaboratoryRIKEN, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan.,Research Initiative for Supra-Materials (RISM), Shinshu University, Ueda, 386-8567, Japan
| | - Takaaki Sato
- Department of Applied Chemistry Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
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42
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Wan ZJ, Yuan XF, Luo J. Visible light induced 3-position-selective addition of arylpropiolic acids with ethers via C(sp 3)-H functionalization. Org Biomol Chem 2020; 18:3258-3262. [PMID: 32297885 DOI: 10.1039/d0ob00480d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Although the 2-position-selective decarboxylative coupling or addition of arylpropiolic acids with cyclic ethers has been intensively investigated, selective functionalization of arylpropiolic acids at the 3-position is still a big challenge. Herein, an intriguing and mild method for visible light induced regioselective addition of arylpropiolic acids by attacking exclusively at the 3-position with cyclic/acyclic ethers was developed. A variety of 3,3-bis-substituted acrylic acids were successfully obtained in moderate to excellent yields. A plausible reaction mechanism involving an energy transfer induced radical addition in the presence of visible light and photocatalyst was proposed.
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Affiliation(s)
- Zi-Juan Wan
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Xiao-Feng Yuan
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Jun Luo
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
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43
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Yokoyama H, Miyazawa M. Palladium(II)-catalyzed Stereoselective Cyclization to the Ether and its Application to the Synthetic Studies of Yessotoxin. J SYN ORG CHEM JPN 2020. [DOI: 10.5059/yukigoseikyokaishi.78.317] [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]
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44
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Dual C‐C Bond Forming Heck and Sonogashira Couplings Followed by Hydroarylation: Synthesis of Tricyclic Frameworks. ChemistrySelect 2020. [DOI: 10.1002/slct.201904933] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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45
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Qiu YF, Niu YJ, Song XR, Wei X, Chen H, Li SX, Wang XC, Huo C, Quan ZJ, Liang YM. Iodine promoted cascade cycloisomerization of 1-en-6,11-diynes. Chem Commun (Camb) 2020; 56:1421-1424. [PMID: 31912818 DOI: 10.1039/c9cc08286g] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An iodine promoted cascade cycloisomerization of 1-en-6,11-diynes is presented for the easy preparation of tetrahydrobenzo[f]isoquinolines. This developed reaction system is identified as having good functional-group applicability and can be scaled up to gram quantities. In this transformation, two new cyclic frameworks and one carbonyl group are formed with four new bonds constructed. Additionally, the resulting iodo-substituted compounds could be further derived through simple elimination reactions.
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Affiliation(s)
- Yi-Feng Qiu
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, People's Republic of China.
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46
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Liu X, Sun S, Wang G, Bai Z, Pang J, Liu L. Catalytic enantioselective alkylation of 2-alkoxy-tetrahydrofurans. Org Chem Front 2020. [DOI: 10.1039/d0qo00104j] [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 nickel(ii)-catalyzed asymmetric alkylation of non-resonance-stabilized oxocarbenium ions with carboxylic acid derivatives on a large scale has been disclosed.
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Affiliation(s)
- Xuan Liu
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- P.R. China
| | - Shaofa Sun
- School of Nuclear Technology and Chemistry & Biology
- Hubei University of Science and Technology
- Xianning 437000
- P.R. China
| | - Gang Wang
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- P.R. China
| | - Zhushuang Bai
- Shandong Medicinal Biotechnology Centre
- Key Laboratory for Rare & Uncommon Diseases of Shandong Province
- Key Lab for Biotech-Drugs of National Health Commission
- Institute of Materia Medica
- Shandong First Medical University & Shandong Academy of Medical Sciences
| | - Jingxiang Pang
- Shandong Medicinal Biotechnology Centre
- Key Laboratory for Rare & Uncommon Diseases of Shandong Province
- Key Lab for Biotech-Drugs of National Health Commission
- Institute of Materia Medica
- Shandong First Medical University & Shandong Academy of Medical Sciences
| | - Lei Liu
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- P.R. China
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47
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Wan Z, Yuan X, Xiao T, Wang X, Luo J. A Pd‐Catalyzed Three‐Component Reaction and Hydrogenation Strategy to Prepare 2‐Functionalized Cyclic Ethers Involving a Radical Initiating C(sp
3
)‐H Activation. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900567] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zi‐juan Wan
- School of Chemical EngineeringNanjing University of Science and Technology Nanjing 210094 China
| | - Xiao‐feng Yuan
- School of Chemical EngineeringNanjing University of Science and Technology Nanjing 210094 China
| | - Tian Xiao
- School of Chemical EngineeringNanjing University of Science and Technology Nanjing 210094 China
| | - Xiao‐rong Wang
- School of Chemical EngineeringNanjing University of Science and Technology Nanjing 210094 China
| | - Jun Luo
- School of Chemical EngineeringNanjing University of Science and Technology Nanjing 210094 China
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48
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49
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Sakai T, Sakakibara H, Omoto Y, Tsunekawa M, Hadano Y, Kato S, Mori Y. Synthesis of the GHIJKL Fragment of Gymnocin-B. Org Lett 2019; 21:6864-6868. [PMID: 31436430 DOI: 10.1021/acs.orglett.9b02502] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The GHIJKL fragment of gymnocin-B was synthesized using the oxiranyl anion strategy. The first highlight of the synthesis is the bromoketone cyclization reaction on the oxepane ring to construct the fused bisoxepane GH ring. The second key step is the introduction of the trans-4-hydroxy-3-methyloxepane J ring via addition of trimethylaluminum to a conjugated oxonium moiety, followed by diastereoselective epoxidation and regioselective reduction.
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Affiliation(s)
- Takeo Sakai
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Hideaki Sakakibara
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Yumi Omoto
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Marina Tsunekawa
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Yoshinori Hadano
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Shota Kato
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
| | - Yuji Mori
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya 468-8503, Japan
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50
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Yasudomi T, Yakushiji H, Torikai K, Ebine M, Oishi T. Unified Synthesis of the DEF and GHI Ring Systems of Maitotoxin. CHEM LETT 2019. [DOI: 10.1246/cl.190479] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takaya Yasudomi
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hiroyuki Yakushiji
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kohei Torikai
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Makoto Ebine
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Tohru Oishi
- Department of Chemistry, Faculty and Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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