1
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Qiao X, Zhai S, Xu J, He H, He X, Hu L, Gao S. Asymmetric Photoinduced Excited-State Nazarov Reaction. J Am Chem Soc 2024. [PMID: 39383449 DOI: 10.1021/jacs.4c11481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/11/2024]
Abstract
We report herein the first asymmetric photoinduced excited-state Nazarov reaction of non-aromatic dicyclic divinyl ketones by using hydrogen-bonding catalysis. The enantioselectivity of photoinduced electrocyclization is highly dependent on the structural features of the substrate and its interaction with chiral catalysts. For the simple dicyclic divinyl ketone substrates, there is no discernible selectivity of the hydrogen bond coordination between the thiourea and carbonyl groups of the substrates in the ground state. However, we found that the direction of the electrocyclization was well controlled in each coordination model and the N,N'-dimethylamine motif acts as a base in the regioselective deprotonation process, which leads to the formation of two stereoisomers with high enantioselectivity. Photolysis of dicyclic divinyl ketones bearing a 1,3-dioxolane motif in the presence of bifunctional hybrid peptide-thiourea chiral catalysts gave the tricyclic cis-hydrofluorenones with good enantioselectivity. Mechanistic and DFT studies suggested that the amide and thiourea groups in the bifunctional chiral catalysts play a key role as H-bond donors, which coordinate with both the carbonyl group and the 1,3-dioxolane motif to provide a more favorable chiral species, and control the direction of the electrocyclization. Due to the presence of the rigid 1,3-dioxolane ring, the deprotonation/protonation process occurs regiospecifically with high driving force. This photo-electrocyclization is mild (room temperature and neutral solution), which results a broad reaction scope and functional group tolerance and demonstrates its synthetic potential in organic synthesis.
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Affiliation(s)
- Xuelong Qiao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| | - Shaojun Zhai
- Shanghai Frontiers Science Center of Molecule Intelligent Syntheses, School of Chemistry and Molecular Engineering, Wuhu Hospital Affiliated to East China Normal University, East China Normal University, Shanghai 200062, China
| | - Jiwei Xu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| | - Haibing He
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| | - Xiao He
- Shanghai Frontiers Science Center of Molecule Intelligent Syntheses, School of Chemistry and Molecular Engineering, Wuhu Hospital Affiliated to East China Normal University, East China Normal University, Shanghai 200062, China
| | - Lianrui Hu
- Shanghai Frontiers Science Center of Molecule Intelligent Syntheses, School of Chemistry and Molecular Engineering, Wuhu Hospital Affiliated to East China Normal University, East China Normal University, Shanghai 200062, China
| | - Shuanhu Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
- Shanghai Frontiers Science Center of Molecule Intelligent Syntheses, School of Chemistry and Molecular Engineering, Wuhu Hospital Affiliated to East China Normal University, East China Normal University, Shanghai 200062, China
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2
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Handjaya JP, Patankar N, Reid JP. The Diversity and Evolution of Chiral Brønsted Acid Structures. Chemistry 2024; 30:e202400921. [PMID: 38706381 DOI: 10.1002/chem.202400921] [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: 03/05/2024] [Revised: 04/22/2024] [Accepted: 05/06/2024] [Indexed: 05/07/2024]
Abstract
The chemical space of chiral Brønsted acid catalysts is defined by quantity and complexity, reflecting the diverse synthetic challenges confronted and the innovative molecular designs introduced. Here, we detail how this successful outcome is a powerful demonstration of the benefits of utilizing both local structure searches and a comprehensive understanding of catalyst performance for effective and efficient exploration of Brønsted acid properties. In this concept article we provide an evolutionary overview of this field by summarizing the approaches to catalyst optimization, the resulting structures, and functions.
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Affiliation(s)
- Jasemine P Handjaya
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada
| | - Niraja Patankar
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada
| | - Jolene P Reid
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada
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3
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Dickinson CF, Yap GPA, Tius MA. Anion-accelerated asymmetric Nazarov cyclization: access to vicinal all-carbon quaternary stereocenters. Org Biomol Chem 2023; 21:5014-5020. [PMID: 37265330 PMCID: PMC10372926 DOI: 10.1039/d3ob00735a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We have developed a catalytic asymmetric Nazarov cyclization that results in the formation of two contiguous all-carbon quaternary stereocenters in high yield with excellent levels of asymmetric induction. This method requires no catalyst recognition elements in the starting materials that are simple diketoesters. Geometrically pure E or Z isomers of the starting material lead to diastereomerically pure products with high enantioselectivity because the species that undergoes cyclization is a rhodium enolate that is configurationally stable.
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Affiliation(s)
- Cody F Dickinson
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA.
| | - Glenn P A Yap
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA
| | - Marcus A Tius
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA.
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4
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Cheng Q, Yan W, Li T, Jiao Y, Tang Z. Insights into the regioselectivity and diastereoselectivity of the Nazarov cyclization of 3-alkenyl-2-indolylmethanol with tryptophol. Org Chem Front 2023. [DOI: 10.1039/d2qo01896a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Density functional theory calculations of Nazarov cyclizations showed that 3-alkenyl-2-indolylmethanol and tryptophol formed binary and ternary complexes, respectively, in the presence and absence of H2O to produce C–N and C–C products.
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Affiliation(s)
- Qi Cheng
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
| | - Wenxin Yan
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
| | - Tian Li
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
| | - Yinchun Jiao
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
- Key Laboratory of Theoretical Organic Chemistry and Functional Molecular, Ministry of Education, Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers, Hunan University of Science and Technology, Xiangtan, 411201, China
| | - Zilong Tang
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
- Key Laboratory of Theoretical Organic Chemistry and Functional Molecular, Ministry of Education, Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers, Hunan University of Science and Technology, Xiangtan, 411201, China
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5
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Kubota Y, Fukuzumi J, Saito K, Yamada T. Experimental Investigation of Microwave-Specific Effect on Nazarov Cyclization. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20220254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yusuke Kubota
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Junichiro Fukuzumi
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Kodai Saito
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Tohru Yamada
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
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6
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Li H, Yang Q, Xu L, Wei J, Tang Y, Cai Y. Cu(I)/Chiral Vanadium Complex Cooperatively Catalyzed Asymmetric Sulfonation/Rearrangement of Alkenylfurans. Org Lett 2022; 24:8202-8207. [DOI: 10.1021/acs.orglett.2c03304] [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)
- Hongxiang Li
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Qian Yang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Lei Xu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Jie Wei
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Yurong Tang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
| | - Yunfei Cai
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
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7
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Kutateladze DA, Wagen CC, Jacobsen EN. Chloride-Mediated Alkene Activation Drives Enantioselective Thiourea and Hydrogen Chloride Co-Catalyzed Prins Cyclizations. J Am Chem Soc 2022; 144:15812-15824. [PMID: 35994741 PMCID: PMC9437134 DOI: 10.1021/jacs.2c06688] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The mechanism of chiral hydrogen-bond donor (HBD) and hydrogen chloride (HCl) co-catalyzed Prins cyclizations was analyzed through a combination of experimental and computational methods and revealed to involve an unexpected and previously unrecognized mode of alkene activation. Kinetic and spectroscopic studies support the participation of a catalytically active HCl·HBD complex that displays reduced Brønsted acidity relative to HCl alone. Nevertheless, rate acceleration relative to the HCl-catalyzed background reaction as well as high levels of enantioselectivity are achieved. This inverse Brønsted correlation is ascribed to chloride-mediated substrate activation in the rate-limiting and enantiodetermining cyclization transition state. Density functional theory (DFT) calculations, distortion-interaction analysis, and quasiclassical dynamics simulations support a stepwise mechanism in which rate acceleration and enantioselectivity are achieved through the precise positioning of the chloride anion within the active site of the chiral thiourea to enhance the nucleophilicity of the alkene and provide transition-state stabilization through local electric field effects. This mode of selective catalysis through anion positioning likely has general implications for the design of enantioselective Brønsted acid-catalyzed reactions involving π-nucleophiles.
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Affiliation(s)
| | | | - Eric N. Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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8
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Solas M, Suárez‐Pantiga S, Sanz R. Asymmetric Gold(I)-Catalyzed Tandem Hydroarylation-Nazarov Cyclization: Enantioselective Access to Cyclopentenones. Angew Chem Int Ed Engl 2022; 61:e202207406. [PMID: 35785510 PMCID: PMC9544548 DOI: 10.1002/anie.202207406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Indexed: 11/13/2022]
Abstract
The asymmetric synthesis of cyclopentachromenones from gold-catalyzed reaction of readily available skipped alkenynones is described. This cascade reaction involves an initial anti-Michael hydroarylation of the ynone moiety to form a gold-functionalized dialkenylketone intermediate, followed by a Nazarov cyclization that proceeds in an unprecedented enantioselective manner. Excellent enantiomeric ratios and chemical yields are obtained under mild reaction conditions.
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Affiliation(s)
- Marta Solas
- Área de Química Orgánica. Departamento de QuímicaFacultad de CienciasUniversidad de BurgosPza. Misael Bañuelos09001BurgosSpain
| | - Samuel Suárez‐Pantiga
- Área de Química Orgánica. Departamento de QuímicaFacultad de CienciasUniversidad de BurgosPza. Misael Bañuelos09001BurgosSpain
| | - Roberto Sanz
- Área de Química Orgánica. Departamento de QuímicaFacultad de CienciasUniversidad de BurgosPza. Misael Bañuelos09001BurgosSpain
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9
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Solas M, Suárez-Pantiga S, Sanz R. Asymmetric Gold(I)‐Catalyzed Tandem Hydroarylation‐Nazarov Cyclization: Enantioselective Access to Cyclopentenones. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Marta Solas
- Universidad de Burgos Química Facultad de CienciasPza. Misael Bañuelos, s/n 09001 Burgos SPAIN
| | - Samuel Suárez-Pantiga
- Universidad de Burgos Química Facultad de CienciasPza. Misael Bañuelos, s/n 09001 Burgos SPAIN
| | - Roberto Sanz
- Universidad de Burgos Área de Química Orgánica Departamento de Química Facultad de Ciencias Pza. Misael Bañuelos s/n 09001 Burgos SPAIN
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10
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Enyne diketones as substrate in asymmetric Nazarov cyclization for construction of chiral allene cyclopentenones. Nat Commun 2022; 13:3146. [PMID: 35672319 PMCID: PMC9174488 DOI: 10.1038/s41467-022-30846-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 05/17/2022] [Indexed: 11/08/2022] Open
Abstract
The Nazarov cyclization is one of the most powerful tools for the stereoselective synthesis of various cyclopentenone scaffolds. Therefore, developing the new classes substrate of Nazarov reaction is an important endeavor in synthetic chemistry. Herein, we report enyne diketones, enables diastereo- and enantioselective construction of chiral allene cyclopentenones in moderate to good yields with good enantioselectivities (up to 97% ee). Importantly, it is a typical example for asymmetric synthesis of cyclopentanones with allene moiety using Nazarov cyclisation. Mechanistic studies indicate that this metal-organo relay catalysis protocol involves a rhodium-catalyzed tandem oxonium ylide formation/[2,3]-sigmatropic rearrangement/reverse benzylic acid rearrangement, followed by organo-catalyzed asymmetric Nazarov cyclization/alkyne-to-allene isomerization to give the final chiral allene cyclopentenones.
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11
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Peng B, Ma J, Guo J, Gong Y, Wang R, Zhang Y, Zeng J, Chen WW, Ding K, Zhao B. A Powerful Chiral Super Brønsted C-H Acid for Asymmetric Catalysis. J Am Chem Soc 2022; 144:2853-2860. [PMID: 35143204 DOI: 10.1021/jacs.1c12723] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new type of chiral super Brønsted C-H acids, BINOL-derived phosphoryl bis((trifluoromethyl)sulfonyl) methanes (BPTMs), were developed. As compared to widely utilized BINOL-derived chiral phosphoric acids (BPAs) and N-triflyl phosphoramides (NTPAs), BPTMs displayed much higher Brønsted acidity, resulting in dramatically improved activity and excellent enantioselectivity as demonstrated in catalytic asymmetric Mukaiyama-Mannich reaction, allylic amination, three-component coupling of allyltrimethylsilane with 9-fluorenylmethyl carbamate and aldehydes, and protonation of silyl enol ether. These new strong Brønsted C-H acids have provided a platform for expanding the chemistry of asymmetric Brønsted acid catalysis.
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Affiliation(s)
- Bingfei Peng
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China
| | - Jiguo Ma
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China.,State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Jianhua Guo
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China
| | - Yating Gong
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China
| | - Ronghao Wang
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China
| | - Yi Zhang
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China.,State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Jinlong Zeng
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China
| | - Wen-Wen Chen
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China
| | - Kuiling Ding
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Baoguo Zhao
- The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai 200234, China
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12
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To AJ, Murphy GK. Iodolium salts as halogen-bond donor catalysts in the Nazarov cyclization: the molecular oxygen enigma. NEW J CHEM 2022. [DOI: 10.1039/d2nj02731c] [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
Nazarov cyclizations of activated precurosrs are achieved under iodolium catalysis, provided that oxygen is present for catalyst activation and turnover.
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Affiliation(s)
- Avery J. To
- Department of Chemistry and Waterloo Institute for Nanotechnology University of Waterloo 200 University Ave W., Waterloo, Ontario, N2L3G1, Canada
| | - Graham K. Murphy
- Department of Chemistry and Waterloo Institute for Nanotechnology University of Waterloo 200 University Ave W., Waterloo, Ontario, N2L3G1, Canada
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13
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Kutateladze DA, Jacobsen EN. Cooperative Hydrogen-Bond-Donor Catalysis with Hydrogen Chloride Enables Highly Enantioselective Prins Cyclization Reactions. J Am Chem Soc 2021; 143:20077-20083. [PMID: 34812618 PMCID: PMC8717859 DOI: 10.1021/jacs.1c10890] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Cooperative asymmetric catalysis with hydrogen chloride (HCl) and chiral dual-hydrogen-bond donors (HBDs) is applied successfully to highly enantioselective Prins cyclization reactions of a wide variety of simple alkenyl aldehydes. The optimal chiral catalysts were designed to withstand the strongly acidic reaction conditions and were found to induce rate accelerations of 2 orders of magnitude over reactions catalyzed by HCl alone. We propose that the combination of strong mineral acids and chiral hydrogen-bond-donor catalysts may represent a general strategy for inducing enantioselectivity in reactions that require highly acidic conditions.
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Affiliation(s)
- Dennis A. Kutateladze
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Eric N. Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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14
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Caballero-García G, Goodman JM. N-Triflylphosphoramides: highly acidic catalysts for asymmetric transformations. Org Biomol Chem 2021; 19:9565-9618. [PMID: 34723293 DOI: 10.1039/d1ob01708j] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
N-Triflylphosphoramides (NTPA), have become increasingly popular catalysts in the development of enantioselective transformations as they are stronger Brønsted acids than the corresponding phosphoric acids (PA). Their highly acidic, asymmetric active site can activate difficult, unreactive substrates. In this review, we present an account of asymmetric transformations using this type of catalyst that have been reported in the past ten years and we classify these reactions using the enantio-determining step as the key criterion. This compendium of NTPA-catalysed reactions is organised into the following categories: (1) cycloadditions, (2) electrocyclisations, polyene and related cyclisations, (3) addition reactions to imines, (4) electrophilic aromatic substitutions, (5) addition reactions to carbocations, (6) aldol and related reactions, (7) addition reactions to double bonds, and (8) rearrangements and desymmetrisations. We highlight the use of NTPA in total synthesis and suggest mnemonics which account for their enantioselectivity.
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Affiliation(s)
| | - Jonathan M Goodman
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, UK.
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15
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Chin YP, Krenske EH. Nazarov Cyclizations Catalyzed by BINOL Phosphoric Acid Derivatives: Quantum Chemistry Struggles To Predict the Enantioselectivity. J Org Chem 2021; 87:1710-1722. [PMID: 34634910 DOI: 10.1021/acs.joc.1c01823] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Quantum chemical calculations have successfully predicted the stereoselectivities of many BINOL phosphoric acid catalyzed reactions over the past 10-15 years. Herein we report a contrasting example: a reaction for which standard quantum chemistry techniques have proven unexpectedly ineffective at explaining the stereoselectivity. The Nazarov cyclizations of a divinyl ketone catalyzed by a BINOL phosphoric acid or H8-BINOL dithiophosphoric acid were studied with a conventional contemporary quantum chemical approach, consisting of transition state optimizations with B3LYP-D3(BJ) and single-point calculations with several functionals in implicit solvent. Unexpectedly, different functionals gave widely different predictions of the level of enantioselectivity and were unable even to agree on which enantiomer of the product would predominate. Molecular dynamics simulations with the OPLS-AA force field provided evidence that the transition state geometries optimized with DFT in the gas phase or in implicit solvent are not good representations of the true transition states of these reactions in solution. One possible reason for this, which may also explain the failure of quantum chemical techniques to reliably predict the enantioselectivity, is the fact that the transition states contain ion pairs which are not highly organized and do not contain any strongly directional noncovalent interactions between the substrate and the catalyst.
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Affiliation(s)
- Yuk Ping Chin
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Elizabeth H Krenske
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia
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16
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Cao J, Hu MY, Liu SY, Zhang XY, Zhu SF, Zhou QL. Enantioselective Silicon-Directed Nazarov Cyclization. J Am Chem Soc 2021; 143:6962-6968. [PMID: 33909970 DOI: 10.1021/jacs.1c01194] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The Nazarov electrocyclization reaction is a convenient, widely used method for construction of cyclopentenones. In the past few decades, catalytic asymmetric versions of the reaction have been extensively studied, but the strategies used to control the position of the double bond limit the substituent pattern of the products and thus the synthetic applications of the reaction. Herein, we report highly enantioselective silicon-directed Nazarov reactions which were cooperatively catalyzed by a Lewis acid and a chiral Brønsted acid. The chiral cyclopentenones we synthesized using this method generally cannot be obtained by means of other catalytic enantioselective reactions, including previously reported methods for enantioselective Nazarov cyclization. The silicon group in the dienone substrate stabilized the β-carbocation of the intermediate, thereby determining the position of the double bond in the product. Mechanistic studies suggested that the combination of Lewis and Brønsted acids synergistically activated the dienone substrate and that the enantioselectivity of the reaction originated from a chiral Brønsted acid promoted proton transfer reaction of the enol intermediate.
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Affiliation(s)
- Jin Cao
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Meng-Yang Hu
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Si-Yuan Liu
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xin-Yu Zhang
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Shou-Fei Zhu
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Qi-Lin Zhou
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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17
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Chen Z, Kong X, Niu S, Yang S, Liu J, Chen B, Luo B, Zhou C, Ding C, Fang X. N-Heterocyclic Carbene-Catalyzed Asymmetric Synthesis of Cyclopentenones. Org Lett 2021; 23:3403-3408. [PMID: 33844550 DOI: 10.1021/acs.orglett.1c00870] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
N-Heterocyclic carbene-catalyzed asymmetric construction of cyclopentenones using enals and α-diketones is achieved, furnishing a series of highly functionalized cyclopentenones in a highly diastereo- and enantioselective manner. The protocol tolerates substrates with both aromatic and aliphatic groups, and further transformations of the products delivered a range of value-added molecules.
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Affiliation(s)
- Zhizhou Chen
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Xiangwen Kong
- State Key Laboratory of Structural Chemistry and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Shengtong Niu
- State Key Laboratory of Structural Chemistry and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Shuang Yang
- State Key Laboratory of Structural Chemistry and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Jinggong Liu
- Orthopedics Department, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510120, China
| | - Bolai Chen
- Orthopedics Department, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510120, China
| | - Benlong Luo
- Pingxiang University, Pingxiang 337055, China
| | - Changyu Zhou
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Chenglin Ding
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Xinqiang Fang
- College of Chemistry, Fuzhou University, Fuzhou 350116, China.,State Key Laboratory of Structural Chemistry and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
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18
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Metternich JB, Reiterer M, Jacobsen EN. Asymmetric Nazarov Cyclizations of Unactivated Dienones by Hydrogen-Bond-Donor/Lewis Acid Co-Catalyzed, Enantioselective Proton-Transfer. Adv Synth Catal 2020; 362:4092-4097. [PMID: 33162875 PMCID: PMC7643875 DOI: 10.1002/adsc.202000831] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Indexed: 12/15/2022]
Abstract
We report an enantioselective Nazarov cyclization catalyzed by chiral hydrogen-bond-donors in concert with silyl Lewis acids. The developed transformation provides access to tri-substituted cyclopentenones in high levels of enantioselectivity (up to 95% e.e.) from a variety of simple unactivated dienones. Kinetic and mechanistic studies are consistent with a reversible 4π-electrocyclization C-C bond-forming step followed by rate- and enantio-determining proton-transfer as the mode of catalysis.
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Affiliation(s)
- Jan B Metternich
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Martin Reiterer
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Eric N Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
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19
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Kikuchi J, Aizawa Y, Terada M. Chiral strong Brønsted acid-catalyzed enantioselective addition reaction of simple olefins with ethyl glyoxylate. Org Chem Front 2020. [DOI: 10.1039/d0qo00448k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
An enantioselective intermolecular addition reaction of 1,1,2-trisubstituted and 1,2- disubstituted simple olefins with ethyl glyoxylate was developed using F10BINOL-derived N-sulfonyl phosphoramide as a chiral strong Brønsted acid catalyst.
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Affiliation(s)
- Jun Kikuchi
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Yuki Aizawa
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Masahiro Terada
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
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20
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Affiliation(s)
- Luisa Lempenauer
- Université Côte d'Azur, CNRSInstitut de Chimie de Nice UMR 7272 Parc Valrose 06108 Nice Cedex 2 France
| | - Gilles Lemière
- Sorbonne Université, CNRSInstitut Parisien de Chimie Moléculaire 4 Place Jussieu, CC 229 75252 Paris Cedex 05 France
| | - Elisabet Duñach
- Université Côte d'Azur, CNRSInstitut de Chimie de Nice UMR 7272 Parc Valrose 06108 Nice Cedex 2 France
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21
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Sugimoto K, Oshiro M, Hada R, Matsuya Y. 2,2'-Biphenol/B(OH) 3 Catalyst System for Nazarov Cyclization. Chem Pharm Bull (Tokyo) 2019; 67:1019-1022. [PMID: 31474725 DOI: 10.1248/cpb.c19-00399] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A novel catalyst system-a combination of the readily available 2,2'-biphenol with the inexpensive, nontoxic, and eco-friendly B(OH)3-promoted the Nazarov cyclization of activated and inactivated divinyl ketones to afford the corresponding cyclopentenones up to 96% yield under, in a cis-selective manner. Compared with the conventional harsh conditions with hazardous reagents, user-friendly method was established with bench-stable and easy-to-handle reagents.
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Affiliation(s)
- Kenji Sugimoto
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| | - Miyu Oshiro
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| | - Ryuhei Hada
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
| | - Yuji Matsuya
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama
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22
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Koenig JJ, Arndt T, Gildemeister N, Neudörfl JM, Breugst M. Iodine-Catalyzed Nazarov Cyclizations. J Org Chem 2019; 84:7587-7605. [DOI: 10.1021/acs.joc.9b01083] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Jonas J. Koenig
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939 Köln, Germany
| | - Thiemo Arndt
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939 Köln, Germany
| | - Nora Gildemeister
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939 Köln, Germany
| | - Jörg-M. Neudörfl
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939 Köln, Germany
| | - Martin Breugst
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939 Köln, Germany
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23
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Ouyang J, Kennemur JL, De CK, Farès C, List B. Strong and Confined Acids Enable a Catalytic Asymmetric Nazarov Cyclization of Simple Divinyl Ketones. J Am Chem Soc 2019; 141:3414-3418. [PMID: 30768254 PMCID: PMC6541325 DOI: 10.1021/jacs.8b13899] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We report a catalytic asymmetric Nazarov cyclization of simple, acylic, alkyl-substituted divinyl ketones using our recently disclosed strong and confined imidodiphosphorimidate Brønsted acids. The corresponding monocyclic cyclopentenones are formed in good yields and excellent regio-, diastereo-, and enantioselectivities. Further, the chemical utility of the obtained enantiopure cyclopentenones is demonstrated.
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Affiliation(s)
- Jie Ouyang
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm-Platz 1 , 45470 Mülheim an der Ruhr , Germany
| | - Jennifer L Kennemur
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm-Platz 1 , 45470 Mülheim an der Ruhr , Germany
| | - Chandra Kanta De
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm-Platz 1 , 45470 Mülheim an der Ruhr , Germany
| | - Christophe Farès
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm-Platz 1 , 45470 Mülheim an der Ruhr , Germany
| | - Benjamin List
- Max-Planck-Institut für Kohlenforschung , Kaiser-Wilhelm-Platz 1 , 45470 Mülheim an der Ruhr , Germany
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24
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Dreger A, Wonner P, Engelage E, Walter SM, Stoll R, Huber SM. A halogen-bonding-catalysed Nazarov cyclisation reaction. Chem Commun (Camb) 2019; 55:8262-8265. [DOI: 10.1039/c9cc02816a] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Various neutral, mono- and dicationic halogen bond donors were screened for their ability to act as catalysts in a Nazarov cyclisation reaction.
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Affiliation(s)
- Alexander Dreger
- Department of Chemistry and Biochemistry
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | - Patrick Wonner
- Department of Chemistry and Biochemistry
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | - Elric Engelage
- Department of Chemistry and Biochemistry
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | - Sebastian M. Walter
- Department of Chemistry and Biochemistry
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | - Raphael Stoll
- Department of Chemistry and Biochemistry
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
| | - Stefan M. Huber
- Department of Chemistry and Biochemistry
- Ruhr-Universität Bochum
- 44801 Bochum
- Germany
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25
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Süsse L, Vogler M, Mewald M, Kemper B, Irran E, Oestreich M. Enantioselektive Nazarov-Cyclisierungen, die von einer axial-chiralen, C 6
F 5
-substituierten Bor-Lewis-Säure katalysiert werden. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Lars Süsse
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Maria Vogler
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Marius Mewald
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 115 10623 Berlin Deutschland
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstraße 40 48149 Münster Deutschland
| | - Benedict Kemper
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstraße 40 48149 Münster Deutschland
| | - Elisabeth Irran
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 115 10623 Berlin Deutschland
| | - Martin Oestreich
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 115 10623 Berlin Deutschland
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstraße 40 48149 Münster Deutschland
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26
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Süsse L, Vogler M, Mewald M, Kemper B, Irran E, Oestreich M. Enantioselective Nazarov Cyclizations Catalyzed by an Axial Chiral C6
F5
-Substituted Boron Lewis Acid. Angew Chem Int Ed Engl 2018; 57:11441-11444. [PMID: 29978948 DOI: 10.1002/anie.201806011] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Lars Süsse
- Institut für Chemie; Technische Universität Berlin; Strasse des 17. Juni 115 10623 Berlin Germany
| | - Maria Vogler
- Institut für Chemie; Technische Universität Berlin; Strasse des 17. Juni 115 10623 Berlin Germany
| | - Marius Mewald
- Institut für Chemie; Technische Universität Berlin; Strasse des 17. Juni 115 10623 Berlin Germany
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstrasse 40 48149 Münster Germany
| | - Benedict Kemper
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstrasse 40 48149 Münster Germany
| | - Elisabeth Irran
- Institut für Chemie; Technische Universität Berlin; Strasse des 17. Juni 115 10623 Berlin Germany
| | - Martin Oestreich
- Institut für Chemie; Technische Universität Berlin; Strasse des 17. Juni 115 10623 Berlin Germany
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstrasse 40 48149 Münster Germany
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27
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Zhang H, Cheng B, Lu Z. Enantioselective Cobalt-Catalyzed Sequential Nazarov Cyclization/Electrophilic Fluorination: Access to Chiral α-Fluorocyclopentenones. Org Lett 2018; 20:4028-4031. [DOI: 10.1021/acs.orglett.8b01597] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Heyi Zhang
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Biao Cheng
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Zhan Lu
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
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28
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Karad SN, Panchal H, Clarke C, Lewis W, Lam HW. Enantioselective Synthesis of Chiral Cyclopent-2-enones by Nickel-Catalyzed Desymmetrization of Malonate Esters. Angew Chem Int Ed Engl 2018; 57:9122-9125. [PMID: 29768708 PMCID: PMC6485403 DOI: 10.1002/anie.201805578] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Indexed: 11/08/2022]
Abstract
The enantioselective synthesis of highly functionalized chiral cyclopent‐2‐enones by the reaction of alkynyl malonate esters with arylboronic acids is described. These desymmetrizing arylative cyclizations are catalyzed by a chiral phosphinooxazoline/nickel complex, and cyclization is enabled by the reversible E/Z isomerization of alkenylnickel species. The general methodology is also applicable to the synthesis of 1,6‐dihydropyridin‐3(2H)‐ones.
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Affiliation(s)
- Somnath Narayan Karad
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK.,School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Heena Panchal
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK.,School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Christopher Clarke
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK.,School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - William Lewis
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Hon Wai Lam
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, University of Nottingham, Jubilee Campus, Triumph Road, Nottingham, NG7 2TU, UK.,School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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29
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Karad SN, Panchal H, Clarke C, Lewis W, Lam HW. Enantioselective Synthesis of Chiral Cyclopent-2-enones by Nickel-Catalyzed Desymmetrization of Malonate Esters. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805578] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Somnath Narayan Karad
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus; Triumph Road Nottingham NG7 2TU UK
- School of Chemistry; University of Nottingham; University Park Nottingham NG7 2RD UK
| | - Heena Panchal
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus; Triumph Road Nottingham NG7 2TU UK
- School of Chemistry; University of Nottingham; University Park Nottingham NG7 2RD UK
| | - Christopher Clarke
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus; Triumph Road Nottingham NG7 2TU UK
- School of Chemistry; University of Nottingham; University Park Nottingham NG7 2RD UK
| | - William Lewis
- School of Chemistry; University of Nottingham; University Park Nottingham NG7 2RD UK
| | - Hon Wai Lam
- The GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry; University of Nottingham; Jubilee Campus; Triumph Road Nottingham NG7 2TU UK
- School of Chemistry; University of Nottingham; University Park Nottingham NG7 2RD UK
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30
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Jin J, Zhao Y, Gouranourimi A, Ariafard A, Hong Chan PW. Chiral Brønsted Acid Catalyzed Enantioselective Dehydrative Nazarov-Type Electrocyclization of Aryl and 2-Thienyl Vinyl Alcohols. J Am Chem Soc 2018; 140:5834-5841. [PMID: 29631393 DOI: 10.1021/jacs.8b02339] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An efficient chiral Brønsted acid-catalyzed enantioselective dehydrative Nazarov-type electrocyclization (DNE) of electron-rich aryl- and 2-thienyl-β-amino-2-en-1-ols is described. The 4π conrotatory electrocyclization reaction affords access to a wide variety of the corresponding 1 H-indenes and 4 H-cyclopenta[ b]thiophenes in excellent yields of up to 99% and enantiomeric excess (ee) values of up to 99%. Experimental and computational studies based on a proposed intimate contact ion-pair species that is further assisted by hydrogen bonding between the amino group of the substrate cation and chiral catalyst anion provide insight into the observed product enantioselectivities.
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Affiliation(s)
- Jianwen Jin
- School of Chemistry , Monash University , Clayton , Victoria 3800 , Australia
| | - Yichao Zhao
- School of Chemistry , Monash University , Clayton , Victoria 3800 , Australia
| | - Ali Gouranourimi
- School of Physical Sciences-Chemistry , University of Tasmania , Hobart , Tasmania 7001 , Australia
| | - Alireza Ariafard
- School of Physical Sciences-Chemistry , University of Tasmania , Hobart , Tasmania 7001 , Australia
| | - Philip Wai Hong Chan
- School of Chemistry , Monash University , Clayton , Victoria 3800 , Australia.,Department of Chemistry , University of Warwick , Coventry , CV4 7AL , United Kingdom
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31
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Mietke T, Cruchter T, Larionov VA, Faber T, Harms K, Meggers E. Asymmetric Nazarov Cyclizations Catalyzed by Chiral-at-Metal Complexes. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701546] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Thomas Mietke
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Thomas Cruchter
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Vladimir A. Larionov
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
- Department of Inorganic Chemistry; Peoples' Friendship University of Russia (RUDN University); Miklukho-Maklaya St. 6 117198 Moscow Russian Federation
| | - Tabea Faber
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Klaus Harms
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Eric Meggers
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
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32
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Wang CS, Wu JL, Li C, Li LZ, Mei GJ, Shi F. Design of C3-Alkenyl-Substituted 2-Indolylmethanols for Catalytic Asymmetric Interrupted Nazarov-Type Cyclization. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701521] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Cong-Shuai Wang
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
| | - Jia-Le Wu
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
| | - Can Li
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
| | - Lin-Zhi Li
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
| | - Guang-Jian Mei
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
| | - Feng Shi
- School of Chemistry and Materials Science; Jiangsu Normal University; Xuzhou 221116 People's Republic of China
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33
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Zhang H, Lu Z. Nickel-catalyzed enantioselective sequential Nazarov cyclization/decarboxylation. Org Chem Front 2018. [DOI: 10.1039/c8qo00279g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The nickel-catalyzed enantioselective sequential Nazarov cyclization/decarboxylation has been developed.
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Affiliation(s)
- Heyi Zhang
- Department of Chemistry
- Zhejiang University
- Hangzhou
- China
| | - Zhan Lu
- Department of Chemistry
- Zhejiang University
- Hangzhou
- China
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34
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Zhang L, Yuan P, Chen J, Huang Y. Enantioselective cooperative proton-transfer catalysis using chiral ammonium phosphates. Chem Commun (Camb) 2018; 54:1473-1476. [DOI: 10.1039/c7cc09549j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral phosphorate anions are shown to be highly enantioselective templates for proton-transfer catalysis.
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Affiliation(s)
- Linrui Zhang
- Key Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Pengfei Yuan
- Key Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Jiean Chen
- Key Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Yong Huang
- Key Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
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35
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Jolit A, Dickinson CF, Kitamura K, Walleser PM, Yap GPA, Tius MA. Catalytic Enantioselective Nazarov Cyclization. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701117] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Anais Jolit
- Chemistry Department; University of Hawaii at Manoa; 2545 The Mall 96822 Honolulu HI USA
| | - Cody F. Dickinson
- Chemistry Department; University of Hawaii at Manoa; 2545 The Mall 96822 Honolulu HI USA
| | - Kei Kitamura
- Chemistry Department; University of Hawaii at Manoa; 2545 The Mall 96822 Honolulu HI USA
| | - Patrick M. Walleser
- Chemistry Department; University of Hawaii at Manoa; 2545 The Mall 96822 Honolulu HI USA
| | - Glenn P. A. Yap
- Department of Chemistry and Biochemistry; University of Delaware; 236 Brown Laboratory 19716 Newark DE USA
| | - Marcus A. Tius
- Chemistry Department; University of Hawaii at Manoa; 2545 The Mall 96822 Honolulu HI USA
- University of Hawaii Cancer Center; 701 Ilalo Street 96813 Honolulu HI USA
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36
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Liu L, Kim H, Xie Y, Farès C, Kaib PSJ, Goddard R, List B. Catalytic Asymmetric [4+2]-Cycloaddition of Dienes with Aldehydes. J Am Chem Soc 2017; 139:13656-13659. [DOI: 10.1021/jacs.7b08357] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luping Liu
- Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Hyejin Kim
- Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Youwei Xie
- Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Christophe Farès
- Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Philip S. J. Kaib
- Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Richard Goddard
- Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Benjamin List
- Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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37
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Ateşin TA, Martinez GM, Flores D. It Is Not Just Up to the Substrate: Palladium(0) Cyclizes Nazarov Substrates through Intramolecular Allylic Alkylation. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00494] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tülay A. Ateşin
- Department of Chemistry, The University of Texas Rio Grande Valley, Edinburg, Texas 78539-2999, United States
| | - Gabriela M. Martinez
- Department of Chemistry, The University of Texas Rio Grande Valley, Edinburg, Texas 78539-2999, United States
| | - David Flores
- Department of Chemistry, The University of Texas Rio Grande Valley, Edinburg, Texas 78539-2999, United States
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38
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Zhou X, Zhao Y, Cao Y, He L. Catalytic Efficient Nazarov Reaction of Unactivated Aryl Vinyl Ketones via a Bidentate Diiron Lewis Acid Activation Strategy. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700820] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xin Zhou
- School of Chemsitry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
| | - Yukun Zhao
- School of Chemsitry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
| | - Yang Cao
- School of Chemsitry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
| | - Lirong He
- School of Chemsitry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
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39
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Wang GP, Chen MQ, Zhu SF, Zhou QL. Enantioselective Nazarov cyclization of indole enones cooperatively catalyzed by Lewis acids and chiral Brønsted acids. Chem Sci 2017; 8:7197-7202. [PMID: 29081952 PMCID: PMC5633839 DOI: 10.1039/c7sc03183a] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 08/25/2017] [Indexed: 11/21/2022] Open
Abstract
Enantioselective control of the chirality of a tertiary α-carbon in the products of a Nazarov cyclization of enones is challenging because the reaction involves an enantioselective proton transfer process. We herein report the use of cooperative catalysis using Lewis acids and chiral Brønsted acids to control the stereochemistry of the tertiary α-carbon in the products of this reaction. Specifically, with ZnCl2 and a chiral spiro phosphoric acid as catalysts, we realized the first enantioselective construction of cyclopenta[b]indoles with chiral tertiary α-carbons via Nazarov cyclization of indole enone substrates with only one coordinating site. Mechanistic studies revealed that the chiral spiro phosphoric acid acts as a multifunctional catalyst: it co-catalyzes the cyclization of the dienone and enantioselectively catalyzes a proton transfer reaction of the enol intermediate. This new strategy of enantioselective control by means of cooperative catalysis may show utility for other challenging asymmetric cyclization reactions.
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Affiliation(s)
- Guo-Peng Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry , College of Chemistry Nankai University , Tianjin 300071 , China . ;
| | - Meng-Qing Chen
- State Key Laboratory and Institute of Elemento-Organic Chemistry , College of Chemistry Nankai University , Tianjin 300071 , China . ;
| | - Shou-Fei Zhu
- State Key Laboratory and Institute of Elemento-Organic Chemistry , College of Chemistry Nankai University , Tianjin 300071 , China . ;
| | - Qi-Lin Zhou
- State Key Laboratory and Institute of Elemento-Organic Chemistry , College of Chemistry Nankai University , Tianjin 300071 , China . ; .,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Nankai University , Tianjin 300071 , China
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40
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Komatsuki K, Sadamitsu Y, Sekine K, Saito K, Yamada T. Stereospecific Decarboxylative Nazarov Cyclization Mediated by Carbon Dioxide for the Preparation of Highly Substituted 2-Cyclopentenones. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705909] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Keiichi Komatsuki
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Yuta Sadamitsu
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Kohei Sekine
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Kodai Saito
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Tohru Yamada
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
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41
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Komatsuki K, Sadamitsu Y, Sekine K, Saito K, Yamada T. Stereospecific Decarboxylative Nazarov Cyclization Mediated by Carbon Dioxide for the Preparation of Highly Substituted 2-Cyclopentenones. Angew Chem Int Ed Engl 2017; 56:11594-11598. [DOI: 10.1002/anie.201705909] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Keiichi Komatsuki
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Yuta Sadamitsu
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Kohei Sekine
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Kodai Saito
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Tohru Yamada
- Department of Chemistry; Keio University; 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
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42
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Li J, Fu Y, Qin C, Yu Y, Li H, Wang W. Asymmetric synthesis of isoquinolinonaphthyridines catalyzed by a chiral Brønsted acid. Org Biomol Chem 2017; 15:6474-6477. [PMID: 28737793 DOI: 10.1039/c7ob01527e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A catalytic asymmetric method for the synthesis of chiral isoquinolinonaphthyridines has been developed. A chiral disulfonimide catalyzes a redox cyclization reaction between 2-methyl-3-aldehydeazaarenes and 1,2,3,4-tetrahydroisoquinolines to deliver a range of isoquinolinonaphthyridines with good to high yields (up to 91%) and up to 92 : 8 er.
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Affiliation(s)
- Jianjun Li
- State Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory of New Drug Design, and School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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43
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Simon A, Lam YH, Houk KN. Origins of Stereoselectivity of Enamine-Iminium-Activated Nazarov Cyclizations by Vicinal Diamines. J Org Chem 2017; 82:8186-8190. [PMID: 28678495 DOI: 10.1021/acs.joc.7b01606] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The mechanism and sources of asymmetric induction in Nazarov reactions reported by Tius and co-workers have been determined with quantum chemical calculations. A chiral vicinal diamine forms an enamine-iminium adduct with α-ketoenones, and this undergoes a cationic conrotatory electrocyclization. The chiral diamine imparts stereocontrol in the enamine-iminium complex by forming a six-membered ring that favors one helicity of the electrocyclization transition state.
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Affiliation(s)
- Adam Simon
- Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095-1569, United States
| | - Yu-Hong Lam
- Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095-1569, United States
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095-1569, United States
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44
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Parmar D, Sugiono E, Raja S, Rueping M. Addition and Correction to Complete Field Guide to Asymmetric BINOL-Phosphate Derived Brønsted Acid and Metal Catalysis: History and Classification by Mode of Activation; Brønsted Acidity, Hydrogen Bonding, Ion Pairing, and Metal Phosphates. Chem Rev 2017; 117:10608-10620. [DOI: 10.1021/acs.chemrev.7b00197] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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45
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46
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Lovie-Toon JP, Tram CM, Flynn BL, Krenske EH. Mechanisms of Carbonyl Activation by BINOL N-Triflylphosphoramides: Enantioselective Nazarov Cyclizations. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00292] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Joseph P. Lovie-Toon
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Camilla Mia Tram
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
- University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Bernard L. Flynn
- Medicinal Chemistry, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Elizabeth H. Krenske
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
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47
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Vinogradov MG, Turova OV, Zlotin SG. Nazarov reaction: current trends and recent advances in the synthesis of natural compounds and their analogs. Org Biomol Chem 2017; 15:8245-8269. [DOI: 10.1039/c7ob01981e] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Recent applications of the Nazarov reaction to stereoselective synthesis of pharmacology-relevant cyclopentenone scaffolds are summarized.
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Affiliation(s)
- Maxim G. Vinogradov
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
| | - Olga V. Turova
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
| | - Sergei G. Zlotin
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
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48
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49
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Affiliation(s)
- Huilin Li
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay, Kowloon Hong Kong SAR China
| | - Rongbiao Tong
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay, Kowloon Hong Kong SAR China
| | - Jianwei Sun
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay, Kowloon Hong Kong SAR China
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50
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Li H, Tong R, Sun J. Catalytic Enantioselective Aza-Piancatelli Rearrangement. Angew Chem Int Ed Engl 2016; 55:15125-15128. [DOI: 10.1002/anie.201607714] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 09/29/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Huilin Li
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay, Kowloon Hong Kong SAR China
| | - Rongbiao Tong
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay, Kowloon Hong Kong SAR China
| | - Jianwei Sun
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay, Kowloon Hong Kong SAR China
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