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Hilker S, Posevins D, Unelius CR, Bäckvall J. Chemoenzymatic Dynamic Kinetic Asymmetric Transformations of β-Hydroxyketones. Chemistry 2021; 27:15623-15627. [PMID: 34428339 PMCID: PMC9293354 DOI: 10.1002/chem.202102683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Indexed: 11/17/2022]
Abstract
Herein we report on the development and application of chemoenzymatic Dynamic Kinetic Asymmetric Transformation (DYKAT) of α-substituted β-hydroxyketones (β-HKs), using Candida antartica lipase B (CALB) as transesterification catalyst and a ruthenium complex as epimerization catalyst. An operationally simple protocol allows for an efficient preparation of highly enantiomerically enriched α-substituted β-oxoacetates. The products were obtained in yields up to 95 % with good diastereomeric ratios.
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Affiliation(s)
- Simon Hilker
- Department of Organic ChemistryArrhenius LaboratoryStockholm University10691StockholmSweden
| | - Daniels Posevins
- Department of Organic ChemistryArrhenius LaboratoryStockholm University10691StockholmSweden
| | - C. Rikard Unelius
- Department of Chemistry and Biomedical ScienceLinnaeus University39231KalmarSweden
| | - Jan‐E. Bäckvall
- Department of Organic ChemistryArrhenius LaboratoryStockholm University10691StockholmSweden
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2
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Bender CF, Widenhoefer RA. Mechanism of the Stereomutation of an Azaplatinacyclobutane Complex. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christopher F. Bender
- French Family Science Center, Duke University, Durham, North Carolina 27708-0346, United States
| | - Ross A. Widenhoefer
- French Family Science Center, Duke University, Durham, North Carolina 27708-0346, United States
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
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3
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Gustafson KPJ, Guðmundsson A, Bajnóczi ÉG, Yuan N, Zou X, Persson I, Bäckvall JE. In Situ Structural Determination of a Homogeneous Ruthenium Racemization Catalyst and Its Activated Intermediates Using X-Ray Absorption Spectroscopy. Chemistry 2020; 26:3411-3419. [PMID: 31976570 PMCID: PMC7155078 DOI: 10.1002/chem.201905479] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Indexed: 12/30/2022]
Abstract
The activation process of a known Ru‐catalyst, dicarbonyl(pentaphenylcyclopentadienyl)ruthenium chloride, has been studied in detail using time resolved in situ X‐ray absorption spectroscopy. The data provide bond lengths of the species involved in the process as well as information about bond formation and bond breaking. On addition of potassium tert‐butoxide, the catalyst is activated and an alkoxide complex is formed. The catalyst activation proceeds via a key acyl intermediate, which gives rise to a complete structural change in the coordination environment around the Ru atom. The rate of activation for the different catalysts was found to be highly dependent on the electronic properties of the cyclopentadienyl ligand. During catalytic racemization of 1‐phenylethanol a fast‐dynamic equilibrium was observed.
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Affiliation(s)
- Karl P J Gustafson
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden.,Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden.,Present address: Borregaard, P.O. Box 162, 1701, Sarpsborg, Norway
| | - Arnar Guðmundsson
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden
| | - Éva G Bajnóczi
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, 75007, Uppsala, Sweden.,Present address: Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, 1121, Budapest, Hungary
| | - Ning Yuan
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden.,Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, 75007, Uppsala, Sweden
| | - Xiaodong Zou
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden
| | - Ingmar Persson
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, 75007, Uppsala, Sweden
| | - Jan-E Bäckvall
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691, Stockholm, Sweden
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Koszelewski D, Borys F, Brodzka A, Ostaszewski R. Synthesis of Enantiomerically Pure 5,6-Dihydropyran-2-ones via Chemoenzymatic Sequential DKR-RCM Reaction. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801819] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Dominik Koszelewski
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Filip Borys
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Anna Brodzka
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
| | - Ryszard Ostaszewski
- Institute of Organic Chemistry; Polish Academy of Sciences; Kasprzaka 44/52 01-224 Warsaw Poland
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5
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Catalytic racemization of secondary alcohols with new (arene)Ru(II)-NHC and (arene)Ru(II)-NHC-tertiary phosphine complexes. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2017.11.040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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6
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Pingen D, Altıntaş Ç, Rudolf Schaller M, Vogt D. A ruthenium racemisation catalyst for the synthesis of primary amines from secondary amines. Dalton Trans 2016; 45:11765-71. [PMID: 27321431 DOI: 10.1039/c6dt01525e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A Ru-based half sandwich complex used in amine and alcohol racemization reactions was found to be active in the splitting of secondary amines to primary amines using NH3. Conversions up to 80% along with very high selectivities were achieved. However, after about 80% conversion the catalyst lost activity. Similar to Shvo's catalyst, the complex might deactivate under the influence of ammonia. It was revealed that not NH3 but mainly the primary amine is responsible for the deactivation.
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Affiliation(s)
- Dennis Pingen
- Chemical Materials Science, Department of Chemistry, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
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7
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Michalak K, Wicha J, Wójcik J. Studies towards dynamic kinetic resolution of 4-hydroxy-2-methylcyclopent-2-en-1-one and its E - O -trityloxime. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.06.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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8
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Koszelewski D, Brodzka A, Żądło A, Paprocki D, Trzepizur D, Zysk M, Ostaszewski R. Dynamic Kinetic Resolution of 3-Aryl-4-pentenoic Acids. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00271] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dominik Koszelewski
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Anna Brodzka
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Anna Żądło
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Daniel Paprocki
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Damian Trzepizur
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Małgorzata Zysk
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Ryszard Ostaszewski
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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9
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Ramakrishnan S, Waldie KM, Warnke I, De Crisci AG, Batista VS, Waymouth RM, Chidsey CED. Experimental and Theoretical Study of CO2 Insertion into Ruthenium Hydride Complexes. Inorg Chem 2016; 55:1623-32. [DOI: 10.1021/acs.inorgchem.5b02556] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Kate M. Waldie
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Ingolf Warnke
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-81087, United States
| | - Antonio G. De Crisci
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Victor S. Batista
- Department of Chemistry, Yale University, New Haven, Connecticut 06520-81087, United States
| | - Robert M. Waymouth
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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10
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Lorusso P, Coetzee J, Eastham GR, Cole-Hamilton DJ. α-Methylenation of Methyl Propanoate by the Catalytic Dehydrogenation of Methanol. ChemCatChem 2015. [DOI: 10.1002/cctc.201500763] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Patrizia Lorusso
- EaStCHEM School of Chemistry; The University of St Andrews, Purdie Building; North Haugh St Andrews, Fife KY16 9ST UK
| | - Jacorien Coetzee
- EaStCHEM School of Chemistry; The University of St Andrews, Purdie Building; North Haugh St Andrews, Fife KY16 9ST UK
| | - Graham R. Eastham
- Lucite International, Technology Centre; P.O. Box 90, Wilton Middlesbrough Cleveland TS6 8JE UK
| | - David J. Cole-Hamilton
- EaStCHEM School of Chemistry; The University of St Andrews, Purdie Building; North Haugh St Andrews, Fife KY16 9ST UK
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11
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Oxidation and β-Alkylation of Alcohols Catalysed by Iridium(I) Complexes with Functionalised N-Heterocyclic Carbene Ligands. Chemistry 2015; 21:17877-89. [DOI: 10.1002/chem.201502910] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Indexed: 11/07/2022]
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12
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Warner MC, Bäckvall JE. Racemization of Olefinic Alcohols by a Carbonyl(cyclopentadienyl)ruthenium Complex: Inhibition by the Carbon-Carbon Double Bond. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Cao H, Cai LH, Wang CX, Zhu XH, Li ZM, Hou XF. Ligand effect in racemization and dynamic kinetic resolution of alcohols: Mechanism on cymene ruthenium complexes. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2014.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Koszelewski D, Zysk M, Brodzka A, Żądło A, Paprocki D, Ostaszewski R. Evaluation of a new protocol for enzymatic dynamic kinetic resolution of 3-hydroxy-3-(aryl)propanoic acids. Org Biomol Chem 2015; 13:11014-20. [DOI: 10.1039/c5ob01380a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The application of tandem metal–enzyme dynamic kinetic resolution (DKR) is a powerful tool for the manufacture of high-value chemical commodities.
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Affiliation(s)
| | - Małgorzata Zysk
- Institute of Organic Chemistry PAS Kasprzaka 44/52
- 01-224 Warsaw
- Poland
| | - Anna Brodzka
- Institute of Organic Chemistry PAS Kasprzaka 44/52
- 01-224 Warsaw
- Poland
| | - Anna Żądło
- Institute of Organic Chemistry PAS Kasprzaka 44/52
- 01-224 Warsaw
- Poland
| | - Daniel Paprocki
- Institute of Organic Chemistry PAS Kasprzaka 44/52
- 01-224 Warsaw
- Poland
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15
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Warner MC, Bäckvall JE. Mechanistic aspects on cyclopentadienylruthenium complexes in catalytic racemization of alcohols. Acc Chem Res 2013; 46:2545-55. [PMID: 23721454 DOI: 10.1021/ar400038g] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclopentadienylruthenium complexes commonly serve as efficient transition metal catalysts in the racemization of alcohols. The combination of the racemization reaction with enzymatic resolution leads to dynamic kinetic resolution (DKR). In DKR, a theoretical yield of 100% is possible, making it a powerful tool for enantioselective synthesis. In this Account, we summarize the most important mechanistic aspects of racemization of alcohols reported over the past decade based on both experimental and computational results. Precatalyst activation is often necessary, either by heating the reaction or by adding an alkoxide-type base. The subsequent alcohol-alkoxide exchange is rapid and introduces the substrate into the catalytic cycle. This exchange requires a free coordination site, which may be created via several different mechanisms. Following alkoxide formation, racemization occurs via β-hydride elimination and subsequent readdition. In cyclopentadienyldicarbonylruthenium alkoxide complexes, which are 18-electron complexes, researchers originally considered two mechanisms for the creation of the free coordination site required for β-hydride elimination: a change in hapticity of the cyclopentadienyl ligand from η5 to η3 and dissociation of a CO ligand. Based on computational and experimental results, we have found strong support for the pathway involving CO dissociation. Researchers had also wondered if the substrate remains coordinated to the metal center (the inner-sphere mechanism) during the hydrogen transfer step(s). Using competition and crossover experiments, we found strong evidence for an inner-sphere mechanism. In summary, we have obtained a detailed picture of the racemization of alcohols by cyclopentadienylruthenium catalysts, leading to the development of more efficient catalytic systems for racemization.
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Affiliation(s)
- Madeleine C. Warner
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jan-E. Bäckvall
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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16
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Oxygenation of Ruthenium Carbene Complexes Containing Naphthothiophene or Naphthofuran: Spectroscopic and DFT Studies. Chem Asian J 2013; 8:2833-42. [DOI: 10.1002/asia.201300726] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Indexed: 11/07/2022]
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17
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Stewart B, Nyhlen J, Martín-Matute B, Bäckvall JE, Privalov T. A computational study of the CO dissociation in cyclopentadienyl ruthenium complexes relevant to the racemization of alcohols. Dalton Trans 2013; 42:927-34. [PMID: 23060073 DOI: 10.1039/c2dt31919e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of an active 16-electron ruthenium sec-alkoxide complex via loss of the CO ligand is an important step in the mechanism of the racemization of sec-alcohols by (η(5)-Ph(5)C(5))Ru(CO)(2)X ruthenium complexes with X = Cl and O(t)Bu. Here we show with accurate DFT calculations the potential energy profile of the CO dissociation pathway for a series of relevant (η(5)-Ph(5)C(5))Ru(CO)(2)X complexes, where X = Cl, O(t)Bu, H and COO(t)Bu. We have found that the CO dissociation energy increases in the following order: O(t)Bu (lowest), Cl, COO(t)Bu and H (highest). Using the distance between ruthenium and C(CO), r = Ru-C(CO), as a constraint, and by optimizing all other degrees of freedom for a range of Ru-CO distances, we obtained relative energies, ΔE(r) and geometries of a sufficient number of transient structures with the elongated Ru-CO bond up to r = 3.4 Å. Our calculations provide a quantitative understanding of the CO ligand dissociation in (η(5)-Ph(5)C(5))Ru(CO)(2)Cl and (η(5)-Ph(5)C(5))Ru(CO)(2)(O(t)Bu) complexes, which is relevant to the mechanism of their catalytic activity in the racemization of alcohols. We recently reported that exchange of the CO ligand by isotopically labeled (13)CO in the Ru-O(t)Bu complex occurs twenty times faster than that in the Ru-Cl complex. This corresponds to a difference of 1.8 kcal mol(-1) in the CO dissociation energy (at room temperature). This is in very good agreement with the calculated difference between the two potential energy curves for Ru-O(t)Bu and Ru-Cl complexes, which is about 1.8-2 kcal mol(-1) around the corresponding transition states of the CO dissociation. The calculated difference in the total energy for CO dissociation in (η(5)-Ph(5)C(5))Ru(CO)(2)X complexes is related to the stabilization provided by the X group in the final 16-electron complexes, which are formed via product-like transition states. In addition to the calculated transition states of CO dissociation in Ru-O(t)Bu and Ru-Cl complexes, the calculated transient structures with the elongated Ru-CO bond provide insight into how the geometry of the ruthenium complex with a potent heteroatom donor group (X) gradually changes when one of the COs is dissociating.
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Affiliation(s)
- Beverly Stewart
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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18
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Mavrynsky D, Murzin DY, Leino R. Kinetic Studies onsec-Alcohol Racemization with Dicarbonylchloro(pentabenzylcyclopentadienyl)- and Dicarbonylchloro(pentaphenylcyclopentadienyl)ruthenium Catalysts. ChemCatChem 2013. [DOI: 10.1002/cctc.201300163] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Alcohol Dehydrogenation with a Dual Site Ruthenium, Boron Catalyst Occurs at Ruthenium. Catalysts 2012. [DOI: 10.3390/catal2040412] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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20
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Marcos R, Martín-Matute B. Combined Enzyme and Transition-Metal Catalysis for Dynamic Kinetic Resolutions. Isr J Chem 2012. [DOI: 10.1002/ijch.201200012] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Fristrup P, Tursky M, Madsen R. Mechanistic investigation of the iridium-catalysed alkylation of amines with alcohols. Org Biomol Chem 2012; 10:2569-77. [PMID: 22349189 DOI: 10.1039/c2ob06603c] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The [Cp*IrCl(2)](2)-catalysed alkylation of amines with alcohols was investigated using a combination of experimental and theoretical methods. A Hammett study involving a series of para-substituted benzyl alcohols resulted in a line with a negative slope. This clearly documents that a positive charge is built up in the transition state, which in combination with the measurement of a significant kinetic isotope effect determines hydride abstraction as being the selectivity-determining step under these conditions. A complementary Hammett study using para-substituted anilines was also carried out. Again, a line with a negative slope was obtained suggesting that nucleophilic attack on the aldehyde is selectivity-determining. A computational investigation of the entire catalytic cycle with full-sized ligands and substrates was performed using density functional theory. The results suggest a catalytic cycle where the intermediate aldehyde stays coordinated to the iridium catalyst and reacts with the amine to give a hemiaminal which is also bound to the catalyst. Dehydration to the imine and reduction to the product amine also takes place without breaking the coordination to the catalyst. The fact that the entire catalytic cycle takes place with all the intermediates bound to the catalyst is important for the further development of this synthetic transformation.
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Affiliation(s)
- Peter Fristrup
- Department of Chemistry, Technical University of Denmark, Building 201, 2800 Kgs, Lyngby, Denmark.
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22
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Sato Y, Kayaki Y, Ikariya T. Efficient dynamic kinetic resolution of racemic secondary alcohols by a chemoenzymatic system using bifunctional iridium complexes with C-N chelate amido ligands. Chem Commun (Camb) 2012; 48:3635-7. [PMID: 22389045 DOI: 10.1039/c2cc30333g] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The combined catalyst system of bifunctional amidoiridium complexes derived from benzylic amines with CALB was found to provide a range of chiral acetates from racemic secondary alcohols in excellent yields with nearly perfect enantioselectivities via dynamic kinetic resolution.
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Affiliation(s)
- Yasuhiro Sato
- Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama 2-12-1-E4-1, Tokyo 152-8552, Japan
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Tsai FY, Ma HW, Huang SL, Lin YC, Wang Y, Liu YH. Cyclization of Aromatic Propargyl Alcohol with a Thiophene Group Yielding Naphthothiophene Aldehyde Induced by a Ruthenium Complex. Chemistry 2012; 18:3399-407. [DOI: 10.1002/chem.201103161] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Indexed: 11/11/2022]
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24
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Nun P, Fortman GC, Slawin AMZ, Nolan SP. Ruthenium Hydroxide Complexes in the Racemization of Secondary Alcohols. Organometallics 2011. [DOI: 10.1021/om200956r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pierrick Nun
- EaStCHEM, School
of Chemistry, University of St. Andrews, St. Andrews, KY16 9ST, U.K
| | - George C. Fortman
- EaStCHEM, School
of Chemistry, University of St. Andrews, St. Andrews, KY16 9ST, U.K
| | | | - Steven P. Nolan
- EaStCHEM, School
of Chemistry, University of St. Andrews, St. Andrews, KY16 9ST, U.K
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Verho O, Johnston EV, Karlsson E, Bäckvall JE. Tuning of the Electronic Properties of a Cyclopentadienylruthenium Catalyst to Match Racemization of Electron-Rich and Electron-Deficient Alcohols. Chemistry 2011; 17:11216-22. [DOI: 10.1002/chem.201100827] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Indexed: 11/05/2022]
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Torres J, Sepúlveda F, Carrión MC, Jalón FA, Manzano BR, Rodríguez AM, Zirakzadeh A, Weissensteiner W, Mucientes AE, Peña MADL. Ruthenium Arene Derivatives of Chiral Ferrocene-Based P,N or P,O Ligands. Transformation of Chloro–Alcohol into Hydrido–Carbonyl Complexes. Organometallics 2011. [DOI: 10.1021/om1008132] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Javier Torres
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, IRICA, Universidad de Castilla-La Mancha, Avda. C. J. Cela, 10, 13071 Ciudad Real, Spain
| | - Francisco Sepúlveda
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, IRICA, Universidad de Castilla-La Mancha, Avda. C. J. Cela, 10, 13071 Ciudad Real, Spain
| | - M. Carmen Carrión
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, IRICA, Universidad de Castilla-La Mancha, Avda. C. J. Cela, 10, 13071 Ciudad Real, Spain
- Fundación PCYTA, Paseo de la Innovación, 1, Edificio Emprendedores, 02006 Albacete, Spain
| | - Félix A. Jalón
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, IRICA, Universidad de Castilla-La Mancha, Avda. C. J. Cela, 10, 13071 Ciudad Real, Spain
| | - Blanca R. Manzano
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Químicas, IRICA, Universidad de Castilla-La Mancha, Avda. C. J. Cela, 10, 13071 Ciudad Real, Spain
| | - Ana M. Rodríguez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Escuela Técnica Superior de Ingenieros Industriales, Avda. C. J. Cela, 3, 13071 Ciudad Real, Spain
| | - Afrooz Zirakzadeh
- Faculty of Chemistry, University of Vienna, Währinger Strasse 38, 1090, Wien, Austria
| | - Walter Weissensteiner
- Faculty of Chemistry, University of Vienna, Währinger Strasse 38, 1090, Wien, Austria
| | - Antonio E. Mucientes
- Departamento de Química Física, Facultad de Químicas, Universidad de Castilla-La Mancha, Avda. C. J. Cela, 10, 13071 Ciudad Real, Spain
| | - M. Angeles de la Peña
- Departamento de Química Física, Facultad de Químicas, Universidad de Castilla-La Mancha, Avda. C. J. Cela, 10, 13071 Ciudad Real, Spain
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28
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Ramstadius C, Träff AM, Krumlinde P, Bäckvall JE, Cumpstey I. Ruthenium-Catalysed Epimerisation of Carbohydrate Alcohols as a Method to Determine the Equilibria for Epimer Interconversion in Hexopyranosides. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100504] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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29
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Gómez-Gallego M, Sierra MA. Kinetic isotope effects in the study of organometallic reaction mechanisms. Chem Rev 2011; 111:4857-963. [PMID: 21545118 DOI: 10.1021/cr100436k] [Citation(s) in RCA: 527] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Mar Gómez-Gallego
- Departamento de Química Orgánica I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain.
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30
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Warner MC, Verho O, Bäckvall JE. CO Dissociation Mechanism in Racemization of Alcohols by a Cyclopentadienyl Ruthenium Dicarbonyl Catalyst. J Am Chem Soc 2011; 133:2820-3. [DOI: 10.1021/ja1098066] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Madeleine C. Warner
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Oscar Verho
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jan-E. Bäckvall
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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31
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Liu PN, Ju KD, Lau CP. Highly Efficient Redox Isomerization of Allylic Alcohols and Transfer Hydrogenation of Ketones and Aldehydes Catalyzed by Ruthenium Complexes. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201000667] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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32
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Bosson J, Poater A, Cavallo L, Nolan SP. Mechanism of Racemization of Chiral Alcohols Mediated by 16-Electron Ruthenium Complexes. J Am Chem Soc 2010; 132:13146-9. [DOI: 10.1021/ja104961s] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Dam JH, Osztrovszky G, Nordstrøm LU, Madsen R. Amide synthesis from alcohols and amines catalyzed by ruthenium N-heterocyclic carbene complexes. Chemistry 2010; 16:6820-7. [PMID: 20437429 DOI: 10.1002/chem.201000569] [Citation(s) in RCA: 157] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The direct synthesis of amides from alcohols and amines is described with the simultaneous liberation of dihydrogen. The reaction does not require any stoichiometric additives or hydrogen acceptors and is catalyzed by ruthenium N-heterocyclic carbene complexes. Three different catalyst systems are presented that all employ 1,3-diisopropylimidazol-2-ylidene (IiPr) as the carbene ligand. In addition, potassium tert-butoxide and a tricycloalkylphosphine are required for the amidation to proceed. In the first system, the active catalyst is generated in situ from [RuCl(2)(cod)] (cod=1,5-cyclooctadiene), 1,3-diisopropylimidazolium chloride, tricyclopentylphosphonium tetrafluoroborate, and base. The second system uses the complex [RuCl(2)(IiPr)(p-cymene)] together with tricyclohexylphosphine and base, whereas the third system employs the Hoveyda-Grubbs 1st-generation metathesis catalyst together with 1,3-diisopropylimidazolium chloride and base. A range of different primary alcohols and amines have been coupled in the presence of the three catalyst systems to afford the corresponding amides in moderate to excellent yields. The best results are obtained with sterically unhindered alcohols and amines. The three catalyst systems do not show any significant differences in reactivity, which indicates that the same catalytically active species is operating. The reaction is believed to proceed by initial dehydrogenation of the primary alcohol to the aldehyde that stays coordinated to ruthenium and is not released into the reaction mixture. Addition of the amine forms the hemiaminal that undergoes dehydrogenation to the amide. A catalytic cycle is proposed with the {(IiPr)Ru(II)} species as the catalytically active components.
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Affiliation(s)
- Johan Hygum Dam
- Department of Chemistry, Building 201, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
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34
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Bosson J, Nolan SP. N-Heterocyclic Carbene−Ruthenium Complexes for the Racemization of Chiral Alcohols. J Org Chem 2010; 75:2039-43. [DOI: 10.1021/jo1001005] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Johann Bosson
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews KY16 9ST, U.K
| | - Steven P. Nolan
- EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews KY16 9ST, U.K
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35
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Lee JH, Han K, Kim M, Park J. Chemoenzymatic Dynamic Kinetic Resolution of Alcohols and Amines. European J Org Chem 2010. [DOI: 10.1002/ejoc.200900935] [Citation(s) in RCA: 197] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jin Hee Lee
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), San 31 Hyoja‐dong, Nam‐gu, Pohang‐si, Gyeongbuk, 790‐784, Korea, Fax: +82‐54‐279‐2117
| | - Kiwon Han
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), San 31 Hyoja‐dong, Nam‐gu, Pohang‐si, Gyeongbuk, 790‐784, Korea, Fax: +82‐54‐279‐2117
| | - Mahn‐Joo Kim
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), San 31 Hyoja‐dong, Nam‐gu, Pohang‐si, Gyeongbuk, 790‐784, Korea, Fax: +82‐54‐279‐2117
| | - Jaiwook Park
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), San 31 Hyoja‐dong, Nam‐gu, Pohang‐si, Gyeongbuk, 790‐784, Korea, Fax: +82‐54‐279‐2117
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36
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Cheung FK(K, Clarke AJ, Clarkson GJ, Fox DJ, Graham MA, Lin C, Crivillé AL, Wills M. Kinetic and structural studies on ‘tethered’ Ru(ii) arene ketone reduction catalysts. Dalton Trans 2010; 39:1395-402. [DOI: 10.1039/b915932k] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Åberg JB, Warner MC, Bäckvall JE. Unexpected Formation of a Cyclopentadienylruthenium Alkoxycarbonyl Complex with a Coordinated C═C Bond. J Am Chem Soc 2009; 131:13622-4. [DOI: 10.1021/ja905741w] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jenny B. Åberg
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Madeleine C. Warner
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jan-E. Bäckvall
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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38
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Karvembu R, Prabhakaran R, Muthu Tamizh M, Natarajan K. Ruthenium and enzyme-catalyzed dynamic kinetic resolution of alcohols. CR CHIM 2009. [DOI: 10.1016/j.crci.2008.09.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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39
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Borén L, Leijondahl K, Bäckvall JE. Dynamic kinetic asymmetric transformation of 1,4-diols and the preparation of trans-2,5-disubstituted pyrrolidines. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.02.079] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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40
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Åberg JB, Nyhlén J, Martín-Matute B, Privalov T, Bäckvall JE. CO Assistance in Ligand Exchange of a Ruthenium Racemization Catalyst: Identification of an Acyl Intermediate. J Am Chem Soc 2009; 131:9500-1. [DOI: 10.1021/ja9038455] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jenny B. Åberg
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jonas Nyhlén
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Belén Martín-Matute
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Timofei Privalov
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jan-E. Bäckvall
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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41
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Nyhlén J, Privalov T, Bäckvall JE. Racemization of Alcohols Catalyzed by [RuCl(CO)2(η5-pentaphenylcyclopentadienyl)]-Mechanistic Insights from Theoretical Modeling. Chemistry 2009; 15:5220-9. [DOI: 10.1002/chem.200900291] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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42
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Leijondahl K, Borén L, Braun R, Bäckvall JE. Enzyme- and Ruthenium-Catalyzed Dynamic Kinetic Asymmetric Transformation of 1,5-Diols. Application to the Synthesis of (+)-Solenopsin A. J Org Chem 2009; 74:1988-93. [DOI: 10.1021/jo8025109] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Karin Leijondahl
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Linnéa Borén
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Roland Braun
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jan-E. Bäckvall
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
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43
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Baratta W, Chelucci G, Magnolia S, Siega K, Rigo P. Highly Productive CNN Pincer Ruthenium Catalysts for the Asymmetric Reduction of Alkyl Aryl Ketones. Chemistry 2009; 15:726-32. [DOI: 10.1002/chem.200802112] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Baratta W, Ballico M, Baldino S, Chelucci G, Herdtweck E, Siega K, Magnolia S, Rigo P. New benzo[h]quinoline-based ligands and their pincer Ru and Os complexes for efficient catalytic transfer hydrogenation of carbonyl compounds. Chemistry 2008; 14:9148-60. [PMID: 18803204 DOI: 10.1002/chem.200800888] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
New benzo[h]quinoline ligands (HCN'N) containing a CHRNH2 (R=H (a), Me (b), tBu (c)) function in the 2-position were prepared starting from benzo[h]quinoline N-oxide (in the case of ligand a) and 2-chlorobenzo[h]quinoline (for ligands b and c). These compounds were used to prepare ruthenium and osmium complexes, which are excellent catalysts for the transfer hydrogenation (TH) of ketones. The reaction of a with [RuCl2(PPh3)3] in 2-propanol at reflux afforded the terdentate CN'N complex [RuCl(CN'N)(PPh3)2] (1), whereas the complexes [RuCl(CN'N)(dppb)] (2-4; dppb=Ph2P(CH2)4PPh2) were obtained from [RuCl2(PPh3)(dppb)] with a-c, respectively. Employment of (R,S)-Josiphos, (S,R)-Josiphos*, (S,S)-Skewphos, and (S)-MeO-Biphep in combination with [RuCl2(PPh3)3] and ligand a gave the chiral derivatives [RuCl(CN'N)(PP)] (5-8). The osmium complex [OsCl(CN'N)(dppb)] (12) was prepared by treatment of [OsCl2(PPh3)3] with dppb and ligand a. Reaction of the chloride 2 and 12 with NaOiPr in 2-propanol/toluene afforded the hydride complexes [MH(CN'N)(dppb)] (M=Ru 10, Os 14), through elimination of acetone from [M(OiPr)(CN'N)(dppb)] (M=Ru 9, Os 13). The species 9 and 13 easily reacted with 4,4'-difluorobenzophenone, via 10 and 14, respectively, affording the corresponding isolable alkoxides [M(OR)(CN'N)(dppb)] (M=Ru 11, Os 15). The complexes [MX(CN'N)(P2)] (1-15) (M=Ru, Os; X=Cl, H, OR; P=PPh3 and P2=diphosphane) are efficient catalysts for the TH of carbonyl compounds with 2-propanol in the presence of NaOiPr (2 mol %). Turnover frequency (TOF) values up to 1.8x10(6) h(-1) have been achieved using 0.02-0.001 mol % of catalyst. Much the same activity has been observed for the Ru--Cl, --H, --OR, and the Os--Cl derivatives, whereas the Os--H and Os--OR derivatives display significantly lower activity on account of their high oxygen sensitivity. The chiral Ru complexes 5-8 catalyze the asymmetric TH of methyl-aryl ketones with TOF approximately 10(5) h(-1) at 60 degrees C, up to 97 % enatiomeric excess (ee) and remarkably high productivity (0.005 mol % catalyst loading). High catalytic activity (TOF up to 2.2x10(5) h(-1)) and enantioselectivity (up to 98 % ee) have also been achieved with the in-situ-generated catalysts prepared from [MCl2(PPh3)3], (S,R)-Josiphos or (S,R)-Josiphos*, and the benzo[h]quinoline ligands a-c.
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Affiliation(s)
- Walter Baratta
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Udine, Via Cotonificio 108, 33100 Udine, Italy.
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45
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Lundgren R, Stradiotto M. Rapid Ketone Transfer Hydrogenation by Employing Simple, In Situ Prepared Iridium(I) Precatalysts Supported by “Non-NH” P,N Ligands. Chemistry 2008; 14:10388-95. [DOI: 10.1002/chem.200801530] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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46
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1‐(Pyridin‐2‐yl)methanamine‐Based Ruthenium Catalysts for Fast Transfer Hydrogenation of Carbonyl Compounds in 2‐Propanol. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800498] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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47
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Baratta W, Ballico M, Chelucci G, Siega K, Rigo P. Osmium(II) CNN pincer complexes as efficient catalysts for both asymmetric transfer and H2 hydrogenation of ketones. Angew Chem Int Ed Engl 2008; 47:4362-5. [PMID: 18442026 DOI: 10.1002/anie.200800339] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Walter Baratta
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Udine, Via Cotonificio 108, 33100 Udine, Italy.
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48
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Baratta W, Ballico M, Esposito G, Rigo P. Role of the NH2 Functionality and Solvent in Terdentate CNN Alkoxide Ruthenium Complexes for the Fast Transfer Hydrogenation of Ketones in 2-Propanol. Chemistry 2008; 14:5588-95. [DOI: 10.1002/chem.200701870] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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49
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Castarlenas R, Esteruelas MA, Oñate E. Preparation, X-ray Structure, and Reactivity of an Osmium-Hydroxo Complex Stabilized by an N-Heterocyclic Carbene Ligand: A Base-Free Catalytic Precursor for Hydrogen Transfer from 2-Propanol to Aldehydes. Organometallics 2008. [DOI: 10.1021/om800183k] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ricardo Castarlenas
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Miguel A. Esteruelas
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Enrique Oñate
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
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50
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Baratta W, Ballico M, Chelucci G, Siega K, Rigo P. Osmium(II) CNN Pincer Complexes as Efficient Catalysts for Both Asymmetric Transfer and H2 Hydrogenation of Ketones. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200800339] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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