1
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Rudolf R, Batman D, Mehner N, Walter RRM, Sarkar B. Redox-Active Triazole-Derived Mesoionic Imines with Ferrocenyl Substituents and their Metal Complexes: Directed Hydrogen-Bonding, Unusual C-H Activation and Ion-Pair Formation. Chemistry 2024; 30:e202400730. [PMID: 38634285 DOI: 10.1002/chem.202400730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 04/17/2024] [Accepted: 04/17/2024] [Indexed: 04/19/2024]
Abstract
We present herein the synthesis, characterization and complexation of ferrocenyl-substituted MIIs (mesoionic imines) and their metal complexes. In the free MIIs, strong hydrogen bonding interactions are observed between the imine-N and the C-H bonds of the ferrocenyl substituents both in the solid state and in solution. The influence of this hydrogen bonding is so strong that complexation of the MIIs with [IrCp*Cl2]2 yields unique six-membered iridacycles via C-H-activation of the corresponding C-H-site at the Fc-substituent and not the Ph-substituent. This result is in contrast to previous reports in which always a preferential C-H activation at the phenyl substituent is observed in competitive reactions in the presence of ferrocenyl substituents. The corresponding Ir complexes formed after in-situ halide exchange reaction exist in either [Ir-I] contact or as [Ir]+I- solvent separated ion-pairs depending on the solvent polarity. The iodide coordinated and solvent separated ion-pairs display drastically different physical properties. The TEP (Tolman-electronic-parameter) of these ligands was determined and lines up with previously reported MII-ligands. The redox properties were investigated by a combination of electrochemical and spectroelectrochemical methods. We show here how non-covalent interactions can have a drastic influence on the physical and chemical properties of these new class of compounds.
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Affiliation(s)
- Richard Rudolf
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569, Stuttgart
| | - Derman Batman
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569, Stuttgart
| | - Niklas Mehner
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569, Stuttgart
| | - Robert R M Walter
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569, Stuttgart
| | - Biprajit Sarkar
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569, Stuttgart
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2
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Dinuclear Reactivity of One Metal Exalted by the Second One. TOP ORGANOMETAL CHEM 2023. [DOI: 10.1007/3418_2022_80] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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3
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Advanced Application of Planar Chiral Heterocyclic Ferrocenes. INORGANICS 2022. [DOI: 10.3390/inorganics10100152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
This manuscript is reviewing the superior catalytic activity and selectivity of ferrocene ligands in a wide range of reactions: reduction of ketones, hydrogenation of olefins, hydroboration, cycloaddition, enantioselective synthesis of biaryls, Tsuji–Trost allylation. Moreover, the correlation between a ligand structure and its catalytic activity is discussed in this review.
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4
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Pfeffer C, Probst P, Wannenmacher N, Frey W, Peters R. Direct Enantioselective Addition of Alkynes to Imines by a Highly Efficient Palladacycle Catalyst. Angew Chem Int Ed Engl 2022; 61:e202206835. [PMID: 35701311 PMCID: PMC9545068 DOI: 10.1002/anie.202206835] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Indexed: 11/12/2022]
Abstract
Enantiopure propargylic amines are highly valuable synthetic building blocks. Much effort has been devoted to develop methods for their preparation. The arguably most important strategy is the 1,2-addition of alkynes to imines. Despite remarkable progress, the known methods using Zn and Cu catalysts suffer from the need for high catalyst loadings, typically ranging from 2-60 mol % for neutral aldimine substrates. Here we report a planar chiral Pd complex acting as very efficient catalyst for direct asymmetric alkyne additions to imines, requiring very low catalyst loadings. Turnover numbers of up to 8700 were accomplished. Our investigation suggests that a Pd-acetylide complex is generated as a catalytically relevant intermediate by the aid of an acac ligand acting as internal catalytic base. It is shown that the catalyst is quite stable under the reaction conditions and that product inhibition is not an issue. A total of 39 examples is shown which all yielded almost enantiopure products.
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Affiliation(s)
- Camilla Pfeffer
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - Patrick Probst
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - Nick Wannenmacher
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - Wolfgang Frey
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - René Peters
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
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5
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Pfeffer C, Probst P, Wannenmacher N, Frey W, Peters R. Direct Enantioselective Addition of Alkynes to Imines by a Highly Efficient Palladacycle Catalyst. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202206835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Camilla Pfeffer
- Universität Stuttgart: Universitat Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart GERMANY
| | - Patrick Probst
- Universität Stuttgart: Universitat Stuttgart Institut für Organische Chemie GERMANY
| | - Nick Wannenmacher
- Universität Stuttgart: Universitat Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart GERMANY
| | - Wolfgang Frey
- Universität Stuttgart: Universitat Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart GERMANY
| | - René Peters
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55Raum 06.301 70569 Stuttgart GERMANY
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6
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Wannenmacher N, Heberle M, Yu X, Demircan A, Wanner DM, Pfeffer C, Peters R. Diastereospecific Enantiodivergent Allylation of Pyrazolones as an Entry to β‐Aminoamides. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200185] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Nick Wannenmacher
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - Martin Heberle
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - Xin Yu
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - Aysegül Demircan
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - Daniel M. Wanner
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - Camilla Pfeffer
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - René Peters
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 D-70569 Stuttgart Germany
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7
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Heberle M, Legendre S, Wannenmacher N, Weber M, Frey W, Peters R. Bispalladacycle Catalyzed Nucleophilic Enantioselective Allylation of Aldehydes by Allylstannanes. ChemCatChem 2022. [DOI: 10.1002/cctc.202200093] [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)
- Martin Heberle
- University of Stuttgart: Universitat Stuttgart Chemistry GERMANY
| | - Sarah Legendre
- University of Stuttgart: Universitat Stuttgart Chemistry GERMANY
| | - Nick Wannenmacher
- University of Stuttgart: Universitat Stuttgart Chemistry Pfaffenwaldring 55 D-70569 Stuttgart GERMANY
| | - Manuel Weber
- University of Stuttgart: Universitat Stuttgart Chemistry GERMANY
| | - Wolfgang Frey
- University of Stuttgart: Universitat Stuttgart Chemistry GERMANY
| | - René Peters
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55Raum 06.301 70569 Stuttgart GERMANY
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8
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Wannenmacher N, Keim N, Frey W, Peters R. Catalytic Asymmetric Chlorination of Isoxazolinones. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - Noah Keim
- University of Stuttgart: Universitat Stuttgart Chemistry GERMANY
| | - Wolfgang Frey
- University of Stuttgart: Universitat Stuttgart Chemistry GERMANY
| | - René Peters
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55Raum 06.301 70569 Stuttgart GERMANY
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9
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Wannenmacher N, Pfeffer C, Frey W, Peters R. Enantioenriched γ-Aminoalcohols, β-Amino Acids, β-Lactams, and Azetidines Featuring Tetrasubstituted Fluorinated Stereocenters via Palladacycle-Catalyzed Asymmetric Fluorination of Isoxazolinones. J Org Chem 2021; 87:670-682. [PMID: 34890190 DOI: 10.1021/acs.joc.1c02640] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Enantiopure fluorine containing β-amino acids are of large biological and pharmaceutical interest. Strategies to prepare β-amino acid derivatives possessing a F-containing tetrasubstituted stereocenter at the α-C atom in a catalytic asymmetric sense are rare, in particular using an enantioselective electrophilic C-F bond formation. In the present study, a highly enantioselective palladacycle-catalyzed fluorination of isoxazolinones was developed. It is demonstrated that isoxazolinones are useful precursors toward enantiopure β-amino acid derivatives by diastereo- and chemoselective reduction. The formed γ-aminoalcohols served as valuable precursors toward β-amino acids, β-amino acid esters, and β-lactams, all featuring tetrasubstituted fluorinated stereocenters. In addition, by this work, enantioenriched fluorinated azetidines were accessible for the first time.
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Affiliation(s)
- Nick Wannenmacher
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Camilla Pfeffer
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Wolfgang Frey
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - René Peters
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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10
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11
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Maity R, Birenheide BS, Breher F, Sarkar B. Cooperative Effects in Multimetallic Complexes Applied in Catalysis. ChemCatChem 2021. [DOI: 10.1002/cctc.202001951] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ramananda Maity
- Department of Chemistry University of Calcutta 92, A. P. C. Road Kolkata 700009 India
| | - Bernhard S. Birenheide
- Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT) Engesserstr. 15 76131 Karlsruhe Germany
| | - Frank Breher
- Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT) Engesserstr. 15 76131 Karlsruhe Germany
| | - Biprajit Sarkar
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 D 70569 Stuttgart Germany
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12
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Li J, Yu B, Lu Z. Chiral Imidazoline Ligands and Their Applications in
Metal‐Catalyzed
Asymmetric Synthesis
†. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202000486] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Jiajing Li
- Department of Chemistry, Zhejiang University Hangzhou Zhejiang 310058 China
| | - Bing Yu
- College of Chemistry, Zhengzhou University Zhengzhou Henan 450001 China
| | - Zhan Lu
- Department of Chemistry, Zhejiang University Hangzhou Zhejiang 310058 China
- College of Chemistry, Zhengzhou University Zhengzhou Henan 450001 China
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13
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Stereospezifische asymmetrische Synthese tertiärer Allylalkohol‐ Derivate über katalytische [2,3]‐Meisenheimer‐Umlagerungen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001725] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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Yu X, Wannenmacher N, Peters R. Stereospecific Asymmetric Synthesis of Tertiary Allylic Alcohol Derivatives by Catalytic [2,3]-Meisenheimer Rearrangements. Angew Chem Int Ed Engl 2020; 59:10944-10948. [PMID: 32176404 PMCID: PMC7318343 DOI: 10.1002/anie.202001725] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 03/09/2020] [Indexed: 11/11/2022]
Abstract
Chiral acyclic tertiary allylic alcohols are very important synthetic building blocks, but their enantioselective synthesis is often challenging. A major limitation in catalytic asymmetric 1,2-addition approaches to ketones is the enantioface differentiation by steric distinction of both ketone residues. Herein we report the development of a catalytic asymmetric Meisenheimer rearrangement to overcome this problem, as it proceeds in a stereospecific manner. This allows for high enantioselectivity also for the formation of products in which the residues at the generated tetrasubstituted stereocenter display a similar steric demand. Low catalyst loadings were found to be sufficient and the reaction conditions were mild enough to tolerate even highly reactive functional groups, such as an enolizable aldehyde, a primary tosylate, or an epoxide. Our investigations suggest an intramolecular rearrangement pathway.
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Affiliation(s)
- Xin Yu
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Nick Wannenmacher
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - René Peters
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
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15
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Pinheiro DL, Nielsen DU, Amarante GW, Skrydstrup T. Pd-catalyzed carbonylative α-arylation of azlactones: A formal four-component coupling route to α,α-disubstituted amino acids. J Catal 2018. [DOI: 10.1016/j.jcat.2018.04.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Zheng K, Liu X, Feng X. Recent Advances in Metal-Catalyzed Asymmetric 1,4-Conjugate Addition (ACA) of Nonorganometallic Nucleophiles. Chem Rev 2018; 118:7586-7656. [PMID: 30047721 DOI: 10.1021/acs.chemrev.7b00692] [Citation(s) in RCA: 191] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The metal-catalyzed asymmetric conjugate addition (ACA) reaction has emerged as a general and powerful approach for the construction of optically active compounds and is among the most significant and useful reactions in synthetic organic chemistry. In recent years, great progress has been made in this area with the use of various chiral metal complexes based on different chiral ligands. This review provides comprehensive and critical information on the enantioselective 1,4-conjugate addition of nonorganometallic (soft) nucleophiles and their importance in synthetic applications. The literature is covered from the last 10 years, and a number of examples from before 2007 are included as background information. The review is divided into multiple parts according to the type of nucleophile involved in the reaction (such as C-, B-, O-, N-, S-, P-, and Si-centered nucleophiles) and metal catalyst systems used.
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Affiliation(s)
- Ke Zheng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China
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17
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Rieckhoff S, Frey W, Peters R. Regio-, Diastereo- and Enantioselective Synthesis of Piperidines with Three Stereogenic Centers from Isoxazolinones by Palladium/Iridium Relay Catalysis. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800198] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Stefan Rieckhoff
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Wolfgang Frey
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - René Peters
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
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18
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Li Y, Liu B, Xu MH. Rhodium-Catalyzed Enantioselective Alkenylation of Cyclic Ketimines: Synthesis of Multifunctional Chiral α,α-Disubstituted Allylic Amine Derivatives. Org Lett 2018; 20:2306-2310. [PMID: 29624395 DOI: 10.1021/acs.orglett.8b00651] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
By employing a simple open-chain chiral phosphite-olefin ligand, a highly enantioselective rhodium-catalyzed alkenylation of 1,2,5-thiadiazole 1,1-dioxide-type cyclic ketimines with diverse vinylboronic acids was achieved under mild conditions at room temperature. This protocol provides an efficient and practical access to multifunctional α,α-disubstituted chiral allylic amines bearing quaternary stereocenters in high yields (up to 99%) with good to excellent ee's (up to 99%).
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Affiliation(s)
- Yi Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica , Chinese Academy of Sciences , 555 Zuchongzhi Road , Shanghai , 201203 , China.,University of Chinese Academy of Sciences , Beijing , 100049 , China
| | - Bo Liu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica , Chinese Academy of Sciences , 555 Zuchongzhi Road , Shanghai , 201203 , China.,University of Chinese Academy of Sciences , Beijing , 100049 , China
| | - Ming-Hua Xu
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica , Chinese Academy of Sciences , 555 Zuchongzhi Road , Shanghai , 201203 , China
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19
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Holz J, Ayerbe García M, Frey W, Krupp F, Peters R. Diastereoselective synthesis, structure and reactivity studies of ferrocenyloxazoline gold(i) and gold(ii) complexes. Dalton Trans 2018; 47:3880-3905. [PMID: 29451574 DOI: 10.1039/c8dt00109j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
In the last few decades, gold complexes have demonstrated huge potential for soft Lewis acid catalysis. Despite the intensive research on Au complexes and planar chiral metallacycles, enantiopure ferrocenylgold complexes have - surprisingly - not been reported until the studies presented in this article. Herein, we report the asymmetric synthesis of planar chiral ferrocenyl Au(i) complexes. These dinuclear species form helically chiral ten-membered (NCCCAu)2 rings stabilized by aurophilic interactions. In supramolecular solid state structures, linear, zigzag or helical Au(i) wires with regular AuAu separations were observed. The dissolved dinuclear entities could be oxidized by Au(i) to unique ferrocenyl Au(ii) complexes featuring short Au(ii)-Au(ii) bonds, while the ferrocene core remained intact. However, our initial studies revealed the issue of configurational lability of the ferrocenyl Au(ii) complexes in terms of the element of planar chirality in the presence of the gold source, (Me2S)AuCl. This was successfully addressed by a systematic study implementing permanent σ-donor ortho-protecting groups such as methyl and trimethylsilyl, which impede an epimerization event. Oxidation of the dinuclear Au(i) complexes was also accomplished by oxidative addition reactions with halogenated solvents, preferably CHCl3. Additional reactivity studies revealed that dinuclear Au(ii) dihalide complexes are also formed with reactive alkylhalides such as iodomethane, benzylbromide and benzyliodide. Interestingly, the whole spectral range of colors (violet, blue, green, yellow, and red) is covered by the title complexes depending on the Au oxidation state and the anionic ligands in the Au(ii) complexes. This appears to be quite unusual for ferrocenes, which typically adopt orange to red colors in a non-oxidized state.
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Affiliation(s)
- Julia Holz
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
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20
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Rieckhoff S, Titze M, Frey W, Peters R. Ruthenium-Catalyzed Synthesis of 2H-Azirines from Isoxazolinones. Org Lett 2017; 19:4436-4439. [DOI: 10.1021/acs.orglett.7b01895] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Stefan Rieckhoff
- Institut für Organische
Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Marvin Titze
- Institut für Organische
Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Wolfgang Frey
- Institut für Organische
Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - René Peters
- Institut für Organische
Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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21
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Gorunova ON, Grishin YK, Ilyin MM, Kochetkov KA, Churakov AV, Kuz´mina LG, Dunina VV. Enantioselective catalysis of Suzuki reaction with planar-chiral CN-palladacycles: competition of two catalytic cycles. Russ Chem Bull 2017. [DOI: 10.1007/s11172-017-1729-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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22
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Schrapel C, Frey W, Garnier D, Peters R. Highly Enantioselective Ferrocenyl Palladacycle-Acetate Catalysed Arylation of Aldimines and Ketimines with Arylboroxines. Chemistry 2017; 23:2448-2460. [PMID: 27983770 DOI: 10.1002/chem.201605244] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Indexed: 01/02/2023]
Affiliation(s)
- Carmen Schrapel
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Wolfgang Frey
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Delphine Garnier
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - René Peters
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
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23
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Singh MP, Saleem F, Pal RS, Singh AK. Palladacycles having normal and spiro chelate rings designed from bi- and tridentate ligands with an indole core: structure, synthesis and applications as catalysts. NEW J CHEM 2017. [DOI: 10.1039/c7nj02116j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Palladacycles with normal and spiro rings catalyze Suzuki–Miyaura coupling of ArBr/ArCl/allylation of aldehydes at 0.001/1 mol% loading.
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Affiliation(s)
- Mahabir P. Singh
- Department of Chemistry
- Indian Institute of Technology, Delhi
- New Delhi 110016
- India
| | - Fariha Saleem
- Department of Chemistry
- Indian Institute of Technology, Delhi
- New Delhi 110016
- India
| | - Ram S. Pal
- Department of Chemistry
- Indian Institute of Technology, Delhi
- New Delhi 110016
- India
| | - Ajai K. Singh
- Department of Chemistry
- Indian Institute of Technology, Delhi
- New Delhi 110016
- India
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24
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Slootweg JC, Albada HB, Siegmund D, Metzler-Nolte N. Efficient Reagent-Saving Method for the N-Terminal Labeling of Bioactive Peptides with Organometallic Carboxylic Acids by Solid-Phase Synthesis. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00544] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jack C. Slootweg
- Mercachem, Kerkenbos 1013, 6546 BB Nijmegen, The Netherlands
- Lehrstuhl
für Anorganische Chemie I−Bioanorganische Chemie, Fakultät
für Chemie und Biochemie, Ruhr-Universität Bochum, D-44801 Bochum, Germany
| | - H. Bauke Albada
- Laboratory of Organic Chemistry, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- Lehrstuhl
für Anorganische Chemie I−Bioanorganische Chemie, Fakultät
für Chemie und Biochemie, Ruhr-Universität Bochum, D-44801 Bochum, Germany
| | - Daniel Siegmund
- Lehrstuhl
für Anorganische Chemie I−Bioanorganische Chemie, Fakultät
für Chemie und Biochemie, Ruhr-Universität Bochum, D-44801 Bochum, Germany
| | - Nils Metzler-Nolte
- Lehrstuhl
für Anorganische Chemie I−Bioanorganische Chemie, Fakultät
für Chemie und Biochemie, Ruhr-Universität Bochum, D-44801 Bochum, Germany
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25
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de Castro PP, Carpanez AG, Amarante GW. Azlactone Reaction Developments. Chemistry 2016; 22:10294-318. [PMID: 27245128 DOI: 10.1002/chem.201600071] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Indexed: 11/06/2022]
Abstract
Azlactones (also known as oxazolones) are heterocycles usually employed in the stereoselective synthesis of α,α-amino acids, heterocycles and natural products. The versatility of the azlactone scaffold arises from the numerous reactive sites, allowing its application in a diversity of transformations. This review aims to cover classical and recent applications of oxazolones, especially those involving stereoselective processes. After a short introduction on their structures and intrinsic reactivities, dynamic kinetic resolution (DKR) processes as well as reactions involving stereoselective formation of a new σ C-C bond, such as alkylation/allylation/arylation, aldol, ene, Michael and Mannich reactions will be exposed. Additionally, cycloadditions, Steglich rearrangement and sulfenylation reactions will also be discussed. Recent developments of the well-known Erlenmeyer azlactones will be described. For the most examples, the proposed mechanism, activation modes and/or key reaction intermediates will be exposed to rationalize both the final product and the observed stereochemistry. Finally, this review gives an overview of the synthetic utility of oxazolones.
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Affiliation(s)
- Pedro P de Castro
- Department of Chemistry, Federal University of Juiz de Fora, José Lourenço Kelmer, São Pedro, Juiz de Fora, Brazil
| | - Arthur G Carpanez
- Department of Chemistry, Federal University of Juiz de Fora, José Lourenço Kelmer, São Pedro, Juiz de Fora, Brazil
| | - Giovanni W Amarante
- Department of Chemistry, Federal University of Juiz de Fora, José Lourenço Kelmer, São Pedro, Juiz de Fora, Brazil.
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26
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Bauer JM, Frey W, Peters R. Dual Palladium(II)/Tertiary Amine Catalysis for Asymmetric Regioselective Rearrangements of Allylic Carbamates. Chemistry 2016; 22:5767-77. [PMID: 26990446 DOI: 10.1002/chem.201600138] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Indexed: 11/10/2022]
Abstract
The streamlined catalytic access to enantiopure allylic amines as valuable precursors towards chiral β- and γ-aminoalcohols as well as α- and β-aminoacids is desirable for industrial purposes. In this article an enantioselective method is described that transforms achiral allylic alcohols and N-tosylisocyanate in a single step into highly enantioenriched N-tosyl protected allylic amines via an allylic carbamate intermediate. The latter is likely to undergo a cyclisation-induced [3,3]-rearrangement catalysed by a planar chiral pentaphenylferrocene palladacycle in cooperation with a tertiary amine base. The otherwise often indispensable activation of palladacycle catalysts by a silver salt is not required in the present case and there is also no need for an inert gas atmosphere. To further improve the synthetic value, the rearrangement was used to form dimethylaminosulfonyl-protected allylic amines, which can be deprotected under non-reductive conditions.
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Affiliation(s)
- Johannes Moritz Bauer
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Wolfgang Frey
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - René Peters
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany.
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27
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Veit P, Prantl E, Förster C, Heinze K. Competitive NH···Ru/Fe Hydrogen Bonding in Ferrocenyl Ruthenocenyl Tosyl Hydrazone. Organometallics 2016. [DOI: 10.1021/acs.organomet.5b00963] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Philipp Veit
- Institute of Inorganic Chemistry
and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg
10-14, 55128 Mainz, Germany
| | - Ephraim Prantl
- Institute of Inorganic Chemistry
and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg
10-14, 55128 Mainz, Germany
| | - Christoph Förster
- Institute of Inorganic Chemistry
and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg
10-14, 55128 Mainz, Germany
| | - Katja Heinze
- Institute of Inorganic Chemistry
and Analytical Chemistry, Johannes Gutenberg-University of Mainz, Duesbergweg
10-14, 55128 Mainz, Germany
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28
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Schmidt M, Görls H, Plass W. Facile high-yield synthesis of unsymmetric end-off compartmental double Schiff-base ligands: easy access to mononuclear precursor and unsymmetric dinuclear complexes. RSC Adv 2016. [DOI: 10.1039/c6ra16870a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Novel approach to unsymmetric end-off compartmental ligands with a selective high-yield synthesis and access to unsymmetric dinuclear complexes.
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Affiliation(s)
- Markus Schmidt
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
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29
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Kondo M, Sugimoto M, Nakamura S. Direct catalytic enantioselective Mannich-type reaction of dichloroacetonitrile using bis(imidazoline)-Pd catalysts. Chem Commun (Camb) 2016; 52:13604-13607. [DOI: 10.1039/c6cc07982b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalytic enantioselective Mannich-type reaction of dichloroacetonitrile with imines has been developed.
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Affiliation(s)
- Masaru Kondo
- Department of Life Science and Applied Chemistry
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Mami Sugimoto
- Department of Life Science and Applied Chemistry
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Shuichi Nakamura
- Department of Life Science and Applied Chemistry
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
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30
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Weiss M, Holz J, Peters R. Regioselective Asymmetric Allylic Alkylation Reaction ofα-Cyanoacetates Catalyzed by a Heterobimetallic Platina-/Palladacycle. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501290] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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31
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Ballini R, Petrini M. The Nitro to Carbonyl Conversion (Nef Reaction): New Perspectives for a Classical Transformation. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500008] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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32
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Rieckhoff S, Hellmuth T, Peters R. Regioselective Pd-Catalyzed Synthesis of 2,3,6-Trisubstituted Pyridines from Isoxazolinones. J Org Chem 2015; 80:6822-30. [PMID: 26101943 DOI: 10.1021/acs.joc.5b01065] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Substituted pyridines are prevalent heterocycles of fundamental importance. Their efficient regioselective preparation is often still a challenge despite a large number of reported synthetic methodologies. In this letter we report an operationally simple approach that makes use of readily accessible isoxazolinones. The protocol involves a Pd(II)-catalyzed C-regioselective 1,4-addition to vinylketones, followed by a Pd(0)-catalyzed transformation, which is assumed to proceed via vinylnitrene-Pd intermediates. Both hydrogen and air are necessary for the pyridine formation step and could be employed at ratios above the upper explosive limit thus avoiding a safety issue. This new strategy allows an effective, scalable and practical access to various previously unknown 2,3,6-trisubstituted pyridines.
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Affiliation(s)
- Stefan Rieckhoff
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Tina Hellmuth
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - René Peters
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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33
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Schrapel C, Peters R. Palladacyclus-katalysierte, hoch enantioselektive Arylierung von Iminen mit Arylboroxinen ohne Verwendung einer exogenen Base. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501846] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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34
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Schrapel C, Peters R. Exogenous-Base-Free Palladacycle-Catalyzed Highly Enantioselective Arylation of Imines with Arylboroxines. Angew Chem Int Ed Engl 2015; 54:10289-93. [DOI: 10.1002/anie.201501846] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 04/30/2015] [Indexed: 12/18/2022]
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35
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Gorunova ON, Novitskiy IM, Livantsov MV, Grishin YK, Kochetkov KA, Dunina VV. Enantiopurity determination of CN-palladacycles using 31P NMR spectroscopy with (1R,2S,5R)-menthyloxydiphenylphosphine as chiral derivatizing agent. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.02.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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36
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Fernandes TA, Solařová H, Císařová I, Uhlík F, Štícha M, Štěpnička P. Synthesis of phosphinoferrocene amides and thioamides from carbamoyl chlorides and the structural chemistry of Group 11 metal complexes with these mixed-donor ligands. Dalton Trans 2015; 44:3092-108. [PMID: 25572958 DOI: 10.1039/c4dt03279a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of in situ generated 1'-(diphenylphosphino)-1-lithioferrocene with carbamoyl chlorides, ClC(E)NMe2, affords the corresponding (thio)amides, Ph2PfcC(E)NMe2 (E = O (), S (); fc = ferrocene-1,1'-diyl). These compounds as well as their analogues, Ph2PfcC(O)NHMe () and Ph2PfcC(O)NH2 (), prepared from 1'-(diphenylphosphino)ferrocene-1-carboxylic acid (Hdpf) were studied as ligands for the Group 11 metal ions. In the reactions with [Cu(MeCN)4][BF4], the amides give rise to bis-chelate complexes of the type [Cu(L-κ(2)O,P)2][BF4]. Similar products, [Ag(L-κ(2)O,P)2]ClO4, are obtained from silver(i) perchlorate and , or . In contrast, the reaction of AgClO4 with produces a unique molecular dimer [Ag()(ClO4-κO)]2, where the metal centres are bridged by the sulfur atoms of the P,S-chelating thioamides. The reactions of with [AuCl(tht)] (tht = tetrahydrothiophene) afford the expected gold(i)-phosphine complexes, [AuCl(L-κP)], containing uncoordinated (thio)amide moieties. Hemilabile coordination of the phosphinoamide ligands in complexes with the soft Group 11 metal ions is established by the crystal structure of a solvento complex, [Cu(-κ(2)O,P)(-κP)(CHCl3-κCl)][BF4], which was isolated serendipitously during an attempted crystallisation of [Cu(-κ(2)O,P)2][BF4]. All of the compounds are characterised by spectroscopic methods, and the structures of several representatives of both the free phosphinoamides and their complexes are determined by X-ray diffraction analysis and further studied by DFT calculations and cyclic voltammetry.
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Affiliation(s)
- Tiago A Fernandes
- Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague 2, Czech Republic.
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37
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Ayerbe Garcia M, Frey W, Ringenberg MR, Schwilk M, Peters R. Dinuclear planar chiral ferrocenyl gold(i) & gold(ii) complexes. Chem Commun (Camb) 2015; 51:16806-9. [DOI: 10.1039/c5cc07018j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first scalemic ferrocenyl gold(i) and gold(ii) complexes have been prepared and structurally analysed by X-ray, (spectro)electrochemical and DFT studies.
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Affiliation(s)
| | - Wolfgang Frey
- Universität Stuttgart
- Institut für Organische Chemie
- 70569 Stuttgart
- Germany
| | - Mark R. Ringenberg
- Universität Stuttgart
- Institut für Anorganische Chemie
- 70569 Stuttgart
- Germany
| | - Max Schwilk
- Universität Stuttgart
- Institut für Theoretische Chemie
- 70569 Stuttgart
- Germany
| | - René Peters
- Universität Stuttgart
- Institut für Organische Chemie
- 70569 Stuttgart
- Germany
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38
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Moritz Bauer J, Peters R. Catalytic asymmetric [3,3]-rearrangements of allylic acetimidates. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01749h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The rearrangement of non-halogenated acetimidates in combination with an enzymatic amide hydrolysis is attractive to get almost enantiopure allylic amines.
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Affiliation(s)
- J. Moritz Bauer
- Institut für Organische Chemie
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
| | - René Peters
- Institut für Organische Chemie
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
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39
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Hellmuth T, Frey W, Peters R. Regioselective Catalytic Asymmetric C-Alkylation of Isoxazolinones by a Base-Free Palladacycle-Catalyzed Direct 1,4-Addition. Angew Chem Int Ed Engl 2014; 54:2788-91. [DOI: 10.1002/anie.201410933] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Indexed: 12/16/2022]
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40
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Hellmuth T, Frey W, Peters R. Regioselektive katalytische asymmetrische C-Alkylierung von Isoxazolinonen durch basenfreie Palladacyclus-katalysierte direkte 1,4-Addition. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201410933] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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41
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Weiss M, Peters R. Catalytic Direct Dehydrogenative Cross-Couplings of C–H (Pro)Nucleophiles and Allylic Alcohols without an Additional Oxidant. ACS Catal 2014. [DOI: 10.1021/cs501495g] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Marcel Weiss
- Institut für Organische
Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - René Peters
- Institut für Organische
Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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42
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Yang X, Wang ZX. Mono- and Dinuclear Pincer Nickel Catalyzed Activation and Transformation of C–Cl, C–N, and C–O Bonds. Organometallics 2014. [DOI: 10.1021/om500452c] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xia Yang
- CAS Key
Laboratory of Soft
Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Zhong-Xia Wang
- CAS Key
Laboratory of Soft
Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
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43
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Mechler M, Frey W, Peters R. Macrocyclic Salen–Bis-NHC Hybrid Ligands and Their Application to the Synthesis of Enantiopure Bi- and Trimetallic Complexes. Organometallics 2014. [DOI: 10.1021/om500762r] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Melanie Mechler
- Institut für Organische
Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Wolfgang Frey
- Institut für Organische
Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - René Peters
- Institut für Organische
Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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44
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Teng Q, Hu J, Ling L, Sun R, Dong J, Chen S, Zhang H. Copper-catalyzed direct alkylation of 1,3-azoles with N-tosylhydrazones bearing a ferrocenyl group: a novel method for the synthesis of ferrocenyl-based ligands. Org Biomol Chem 2014; 12:7721-7. [DOI: 10.1039/c4ob01093k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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