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Zhao S, Peters BBC, Zhang H, Xue R, Yang Y, Wu L, Huang T, He L, Andersson PG, Zhou T. Asymmetric and Chemoselective Iridium Catalyzed Hydrogenation of Conjugated Unsaturated Oxime Ethers. Chemistry 2024; 30:e202401333. [PMID: 38779790 DOI: 10.1002/chem.202401333] [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: 04/03/2024] [Revised: 05/19/2024] [Accepted: 05/21/2024] [Indexed: 05/25/2024]
Abstract
Research on the chemoselective metal-catalyzed hydrogenation of conjugated π-systems has mostly been focussed on enones. Herein, we communicate the understudied asymmetric hydrogenation of enimines catalyzed by N,P-iridium complexes and chemoselective toward the alkene. A number of enoxime ethers underwent hydrogenation smoothly to yield the desired products in high yield and stereopurity (up to 99 % yield, up to 99 % ee). No hydrogenation of the C=N π-bond was observed under the applied reaction conditions (20 bar H2, rt, DCM). It was demonstrated that the chiral oxime ether could be hydrolyzed into the ketone with complete preservation of the installed stereogenity at the α-carbon. At last, a binding mode of the substrate to the active iridium catalyst and the consequence for the stereoselective outcome was proposed.
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Affiliation(s)
- Shaohu Zhao
- College of Chemistry and Chemical Engineering, & Institute for Carbon Neutrality, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Bram B C Peters
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16 C, Stockholm, SE-10691, Sweden
| | - Haili Zhang
- College of Chemistry and Chemical Engineering, & Institute for Carbon Neutrality, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Ruize Xue
- College of Chemistry and Chemical Engineering, & Institute for Carbon Neutrality, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Yixin Yang
- College of Chemistry and Chemical Engineering, & Institute for Carbon Neutrality, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Liuying Wu
- College of Chemistry and Chemical Engineering, & Institute for Carbon Neutrality, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Tianrui Huang
- College of Chemistry and Chemical Engineering, & Institute for Carbon Neutrality, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Lei He
- Tianfu Yongxing Laboratory, Chengdu, Sichuan, 610000, China
| | - Pher G Andersson
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16 C, Stockholm, SE-10691, Sweden
- School of Chemistry and Physics, University of Kwazulu-Natal, Private Bag X54001, Durban, 4000, South Africa
| | - Taigang Zhou
- College of Chemistry and Chemical Engineering, & Institute for Carbon Neutrality, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
- Tianfu Yongxing Laboratory, Chengdu, Sichuan, 610000, China
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Coordination Versatility of NHC-metal Topologies in Asymmetric Catalysis: Synthetic Insights and Recent Trends. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Li X, Peters BBC, Tan M, He L, Yang J, Andersson PG, ZHOU TAIGANG. Mono‐N‐Alkylation of Sulfonamides with Alcohols Catalyzed by Iridium N‐Heterocyclic Carbene‐Phosphine Complexes. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xingzhen Li
- SWPU: Southwest Petroleum University College of Chemistry and Chemical Engineering CHINA
| | - Bram B. C. Peters
- Stockholm University: Stockholms Universitet Department of Organic Chemistry SWEDEN
| | - Min Tan
- SWPU: Southwest Petroleum University College of Chemistry and Chemical Engineering CHINA
| | - Lei He
- SWPU: Southwest Petroleum University College of Chemistry and Chemical Engineering CHINA
| | - Jianping Yang
- Stockholm University: Stockholms Universitet Department of Organic Chemistry CHINA
| | - Pher G Andersson
- Stockholm University: Stockholms Universitet Department of Organic Chemistry SWEDEN
| | - TAIGANG ZHOU
- Southwest Petroleum University College of Chemistry and Chemical Engineering Xindu Rd. 8 610500 Chengdu CHINA
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Neshat A, Mastrorilli P, Mousavizadeh Mobarakeh A. Recent Advances in Catalysis Involving Bidentate N-Heterocyclic Carbene Ligands. Molecules 2021; 27:95. [PMID: 35011327 PMCID: PMC8746573 DOI: 10.3390/molecules27010095] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/02/2021] [Accepted: 12/13/2021] [Indexed: 11/17/2022] Open
Abstract
Since the discovery of persistent carbenes by the isolation of 1,3-di-l-adamantylimidazol-2-ylidene by Arduengo and coworkers, we witnessed a fast growth in the design and applications of this class of ligands and their metal complexes. Modular synthesis and ease of electronic and steric adjustability made this class of sigma donors highly popular among chemists. While the nature of the metal-carbon bond in transition metal complexes bearing N-heterocyclic carbenes (NHCs) is predominantly considered to be neutral sigma or dative bonds, the strength of the bond is highly dependent on the energy match between the highest occupied molecular orbital (HOMO) of the NHC ligand and that of the metal ion. Because of their versatility, the coordination chemistry of NHC ligands with was explored with almost all transition metal ions. Other than the transition metals, NHCs are also capable of establishing a chemical bond with the main group elements. The advances in the catalytic applications of the NHC ligands linked with a second tether are discussed. For clarity, more frequently targeted catalytic reactions are considered first. Carbon-carbon coupling reactions, transfer hydrogenation of alkenes and carbonyl compounds, ketone hydrosilylation, and chiral catalysis are among highly popular reactions. Areas where the efficacy of the NHC based catalytic systems were explored to a lesser extent include CO2 reduction, C-H borylation, alkyl amination, and hydroamination reactions. Furthermore, the synthesis and applications of transition metal complexes are covered.
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Affiliation(s)
- Abdollah Neshat
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran;
| | - Piero Mastrorilli
- Dipartimento di Ingegneria Civile, Ambientale, del Territorio, Edile e di Chimica, Politecnico di Bari, Via Orabona, I-70125 Bari, Italy;
| | - Ali Mousavizadeh Mobarakeh
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran;
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Karataş MO, Alıcı B, Passarelli V, Özdemir I, Pérez-Torrente JJ, Castarlenas R. Iridium(i) complexes bearing hemilabile coumarin-functionalised N-heterocyclic carbene ligands with application as alkyne hydrosilylation catalysts. Dalton Trans 2021; 50:11206-11215. [PMID: 34338264 DOI: 10.1039/d1dt01946e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A set of iridium(i) complexes of formula IrCl(κC,η2-IRCouR')(cod) or IrCl(κC, η2-BzIRCouR')(cod) (cod = 1,5-cyclooctadiene; Cou = coumarin; I = imidazolin-2-carbene; BzI = benzimidazolin-2-carbene) have beeen prepared from the corresponding azolium salt and [Ir(μ-OMe)(cod)]2 in THF at room temperature. The crystalline structures of 4b and 5b show a distorted trigonal bipyramidal configuration in the solid state with a coordinated coumarin moiety. In contrast, an equilibrium between this pentacoordinated structure and the related square planar isomer is observed in solution as a consequence of the hemilability of the pyrone ring. Characterization of both species by NMR was achieved at the low and high temperature limits, respectively. In addition, the thermodynamic parameters of the equilibrium, ΔHR and ΔSR, were obtained by VT 1H NMR spectroscopy and fall in the range 22-33 kJ mol-1 and 72-113 J mol-1 K-1, respectively. Carbonylation of IrCl(κC,η2-BzITolCou7,8-Me2)(cod) resulted in the formation of a bis-CO derivative showing no hemilabile behaviour. The newly synthesised complexes efficiently catalyze the hydrosilylation of alkynes at room temperature with a preference for the β-(Z) vinylsilane isomer.
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Affiliation(s)
- Mert Olgun Karataş
- Departamento de Química Inorgánica-Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza-CSIC, C/Pedro Cerbuna 12, CP. 50009, Zaragoza, Spain.
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Azpíroz R, Greger I, Oro LA, Passarelli V, Castarlenas R, Pérez‐Torrente JJ. Preparation of Butadienylpyridines by Iridium-NHC-Catalyzed Alkyne Hydroalkenylation and Quinolizine Rearrangement. Chemistry 2021; 27:11868-11878. [PMID: 33998070 PMCID: PMC8453560 DOI: 10.1002/chem.202101414] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Indexed: 11/08/2022]
Abstract
Iridium(I) N-heterocyclic carbene complexes of formula Ir(κ2 O,O'-BHetA)(IPr)(η2 -coe) [BHetA=bis-heteroatomic acidato, acetylacetonate or acetate; IPr=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-carbene; coe=cyclooctene] have been prepared by treating Ir(κ2 O,O'-BHetA)(η2 -coe)2 complexes with IPr. These complexes react with 2-vinylpyridine to afford the hydrido-iridium(III)-alkenyl cyclometalated derivatives IrH(κ2 O,O'-BHetA)(κ2 N,C-C7 H6 N)(IPr) through the iridium(I) intermediate Ir(κ2 O,O'-BHetA)(IPr)(η2 -C7 H7 N). The cyclometalated IrH(κ2 O,O'-acac)(κ2 N,C-C7 H6 N)(IPr) complex efficiently catalyzes the hydroalkenylation of aromatic and aliphatic terminal alkynes and enynes with 2-vinylpyridine to afford 2-(4R-butadienyl)pyridines with Z,E configuration as the major reaction products (yield up to 89 %). In addition, unprecedented (Z)-2-butadienyl-5R-pyridine derivatives have been obtained as minor reaction products (yield up to 21 %) from the elusive 1Z,3gem-butadienyl hydroalkenylation products. These compounds undergo a thermal 6π-electrocyclization to afford bicyclic 4H-quinolizine derivatives that, under catalytic reaction conditions, tautomerize to 6H-quinolizine to afford the (Z)-2-(butadienyl)-5R-pyridine by a retro-electrocyclization reaction.
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Affiliation(s)
- Ramón Azpíroz
- Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea-ISQCHUniversidad de Zaragoza-CSIC, Facultad de Ciencias50009ZaragozaSpain
| | - Ingo Greger
- Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea-ISQCHUniversidad de Zaragoza-CSIC, Facultad de Ciencias50009ZaragozaSpain
- CLARIANT, Gendorf Site84508BurgkirchenGermany
| | - Luis A. Oro
- Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea-ISQCHUniversidad de Zaragoza-CSIC, Facultad de Ciencias50009ZaragozaSpain
| | - Vincenzo Passarelli
- Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea-ISQCHUniversidad de Zaragoza-CSIC, Facultad de Ciencias50009ZaragozaSpain
| | - Ricardo Castarlenas
- Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea-ISQCHUniversidad de Zaragoza-CSIC, Facultad de Ciencias50009ZaragozaSpain
| | - Jesús J. Pérez‐Torrente
- Departamento de Química Inorgánica Instituto de Síntesis Química y Catálisis Homogénea-ISQCHUniversidad de Zaragoza-CSIC, Facultad de Ciencias50009ZaragozaSpain
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Quan X, Kerdphon S, Peters BBC, Rujirawanich J, Krajangsri S, Jongcharoenkamol J, Andersson PG. Cationic NHC-Phosphine Iridium Complexes: Highly Active Catalysts for Base-Free Hydrogenation of Ketones. Chemistry 2020; 26:13311-13316. [PMID: 32678969 PMCID: PMC7693092 DOI: 10.1002/chem.202002811] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/14/2020] [Indexed: 11/07/2022]
Abstract
Novel bidentate N-heterocyclic carbene-phosphine iridium complexes have been synthesized and evaluated in the hydrogenation of ketones. Reported catalytic systems require base additives and, if excluded, need elevated temperature or high pressure of hydrogen gas to achieve satisfactory reactivity. The developed catalysts showed extremely high reactivity and good enantioselectivity under base-free and mild conditions. In the presence of 1 mol % catalyst under 1 bar hydrogen pressure at room temperature, hydrogenation was complete in 30 minutes giving up to 96 % ee. Again, this high reactivity was achieved in additive-free conditions. Mechanistic experiments demonstrated that balloon pressure of hydrogen was sufficient to form the activate species by reducing and eliminating the 1,5-cyclooctadiene ligand. The pre-activated catalyst was able to hydrogenate acetophenone with 89 % conversion in 5 min.
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Affiliation(s)
- Xu Quan
- Department of Organic ChemistryStockholm UniversityStockholm10691Sweden
| | | | - Bram B. C. Peters
- Department of Organic ChemistryStockholm UniversityStockholm10691Sweden
| | | | | | | | - Pher G. Andersson
- Department of Organic ChemistryStockholm UniversityStockholm10691Sweden
- School of Chemistry and PhysicsUniversity of Kwazulu-NatalPrivate Bag X54001Durban4000South Africa
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