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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Arpa EM, Stafström S, Durbeej B. Photochemical formation of the elusive Dewar isomers of aromatic systems: why are substituted azaborines different? Phys Chem Chem Phys 2024; 26:11295-11305. [PMID: 38529645 DOI: 10.1039/d4cp00777h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
Photochemical reactions enabling efficient transformation of aromatic systems into energetic but stable non-aromatic isomers have a long history in organic chemistry. One recently discovered reaction in this realm is that where derivatives of 1,2-azaborine, a compound isoelectronic with benzene in which two adjacent C atoms are replaced by B and N atoms, form the non-hexagon Dewar isomer. Here, we report quantum-chemical calculations that explain both why 1,2-azaborine is intrinsically more reactive toward Dewar formation than benzene, and how suitable substitutions at the B and N atoms are able to increase the corresponding quantum yield. We find that Dewar formation from 1,2-azaborine is favored by a pronounced driving force that benzene lacks, and that a large improvement in quantum yield arises when the reaction of substituted 1,2-azaborines proceeds without involvement of an intermediary ground-state species. Overall, we report new insights into making photochemical use of the Dewar isomers of aromatic compounds.
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Affiliation(s)
- Enrique M Arpa
- Division of Theoretical Chemistry, IFM, Linköping University, 58183 Linköping, Sweden.
- Institute of Organic Chemistry, RWTH Aachen University, 52056 Aachen, Germany.
| | - Sven Stafström
- Division of Theoretical Physics, IFM, Linköping University, 58183 Linköping, Sweden
| | - Bo Durbeej
- Division of Theoretical Chemistry, IFM, Linköping University, 58183 Linköping, Sweden.
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3
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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] [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 Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Patrick Probst
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Nick Wannenmacher
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Wolfgang Frey
- 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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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. [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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5
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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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6
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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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7
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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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8
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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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9
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Pfeffer C, Wannenmacher N, Frey W, Peters R. Stereo- and Regioselective Dimerization of Alkynes to Enynes by Bimetallic Syn-Carbopalladation. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00473] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Camilla Pfeffer
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Nick Wannenmacher
- 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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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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11
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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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12
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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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13
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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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14
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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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15
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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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16
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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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17
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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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18
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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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19
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Chiral Bimetallic Lewis Acids. TOP ORGANOMETAL CHEM 2015. [DOI: 10.1007/3418_2015_153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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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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21
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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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22
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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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23
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Sudheendran M, Eitel SH, Naumann S, Buchmeiser MR, Peters R. Heterogenization of ferrocene palladacycle catalysts on ROMP-derived monolithic supports and application to a Michael addition. NEW J CHEM 2014. [DOI: 10.1039/c4nj01253d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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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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25
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Direct Enantioselective Three-Component Synthesis of Optically Active Propargylamines in Water. Chemistry 2014; 20:8848-51. [DOI: 10.1002/chem.201402384] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Indexed: 11/07/2022]
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26
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Hellmuth T, Rieckhoff S, Weiss M, Dorst K, Frey W, Peters R. Cooperative Bimetallic Asymmetric Catalysis: Comparison of a Planar Chiral Ruthenocene Bis-Palladacycle to the Corresponding Ferrocene. ACS Catal 2014. [DOI: 10.1021/cs500393x] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Tina Hellmuth
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Stefan Rieckhoff
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Marcel Weiss
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Konstantin Dorst
- 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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27
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See Leng Yap J, Chen HJ, Li Y, Pullarkat SA, Leung PH. Synthesis, Optical Resolution, and Stereochemical Properties of a Rationally Designed Chiral C–N Palladacycle. Organometallics 2014. [DOI: 10.1021/om401044z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jeanette See Leng Yap
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Houguang Jeremy Chen
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Yongxin Li
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Sumod A. Pullarkat
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Pak-Hing Leung
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
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28
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Weber M, Frey W, Peters R. Asymmetric Palladium(II)-Catalyzed Cascade Reaction Giving Quaternary Amino Succinimides by 1,4-Addition and a Nef-Type Reaction. Angew Chem Int Ed Engl 2013; 52:13223-7. [DOI: 10.1002/anie.201307334] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Indexed: 01/25/2023]
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29
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Weber M, Frey W, Peters R. Asymmetrische Palladium(II)-katalysierte Kaskadenreaktion zu quartären Aminosuccinimiden über 1,4-Addition und eine Nef-artige Reaktion. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307334] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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30
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Weber M, Klein JEMN, Miehlich B, Frey W, Peters R. Monomeric Ferrocene Bis-Imidazoline Bis-Palladacycles: Variation of Pd–Pd Distances by an Interplay of Metallophilic, Dispersive, and Coulombic Interactions. Organometallics 2013. [DOI: 10.1021/om400360d] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Manuel Weber
- Institut für
Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569
Stuttgart, Germany
| | - Johannes E. M. N. Klein
- Institut für
Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569
Stuttgart, Germany
| | - Burkhard Miehlich
- 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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31
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Nakamura S, Hyodo K, Nakamura M, Nakane D, Masuda H. Catalytic Enantioselective Allylation of Ketimines by Using Palladium Pincer Complexes with Chiral Bis(imidazoline)s. Chemistry 2013; 19:7304-9. [DOI: 10.1002/chem.201300685] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Indexed: 11/05/2022]
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32
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Weber M, Frey W, Peters R. Catalytic Asymmetric Synthesis of Spirocyclic Azlactones by a Double Michael-Addition Approach. Chemistry 2013; 19:8342-51. [DOI: 10.1002/chem.201300224] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Indexed: 12/12/2022]
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33
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Hyodo K, Kondo M, Funahashi Y, Nakamura S. Catalytic Enantioselective Decarboxylative Cyanoalkylation of Imines by Using Palladium Pincer Complexes withC2-Symmetric Chiral Bis(imidazoline)s. Chemistry 2013; 19:4128-34. [DOI: 10.1002/chem.201203782] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Indexed: 02/03/2023]
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34
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Eitel SH, Jautze S, Frey W, Peters R. Asymmetric Michael additions of α-cyanoacetates by soft Lewis acid/hard Brønsted acid catalysis: stereodivergency with bi- vs. monometallic catalysts. Chem Sci 2013. [DOI: 10.1039/c3sc50419k] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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35
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Mechler M, Latendorf K, Frey W, Peters R. Homo- and Heterobimetallic Pd–, Ag–, and Ni–Hybrid Salen–Bis-NHC Complexes. Organometallics 2012. [DOI: 10.1021/om3008629] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Melanie Mechler
- Institut für
Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Katja Latendorf
- 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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36
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Weber M, Peters R. Pd(II)-Catalyzed Regio-, Enantio-, and Diastereoselective 1,4-Addition of Azlactones Formed in Situ From Racemic Unprotected Amino Acids and Acetic Anhydride. J Org Chem 2012. [DOI: 10.1021/jo302177t] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Manuel Weber
- 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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37
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Weber M, Jautze S, Frey W, Peters R. Bispalladacycle-Catalyzed Michael Addition of In Situ Formed Azlactones to Enones. Chemistry 2012; 18:14792-804. [DOI: 10.1002/chem.201202455] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Indexed: 01/05/2023]
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38
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Hyodo K, Nakamura S, Shibata N. Enantioselective Aza-Morita-Baylis-Hillman Reactions of Acrylonitrile Catalyzed by Palladium(II) Pincer Complexes havingC2-Symmetric Chiral Bis(imidazoline) Ligands. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204891] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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39
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Hyodo K, Nakamura S, Shibata N. Enantioselective Aza-Morita-Baylis-Hillman Reactions of Acrylonitrile Catalyzed by Palladium(II) Pincer Complexes havingC2-Symmetric Chiral Bis(imidazoline) Ligands. Angew Chem Int Ed Engl 2012; 51:10337-41. [DOI: 10.1002/anie.201204891] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Indexed: 12/12/2022]
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40
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Weiss M, Frey W, Peters R. Asymmetric Synthesis of Heterobimetallic Planar Chiral Ferrocene Pallada-/Platinacycles and Their Application to Enantioselective Aza-Claisen Rearrangements. Organometallics 2012. [DOI: 10.1021/om300600v] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Marcel Weiss
- 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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41
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Weber M, Frey W, Peters R. Catalytic Asymmetric Synthesis of Functionalized α,α-Disubstituted α-Amino Acid Derivatives from Racemic Unprotected α-Amino Acids via in-situ Generated Azlactones. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200085] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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42
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Eitel SH, Bauer M, Schweinfurth D, Deibel N, Sarkar B, Kelm H, Krüger HJ, Frey W, Peters R. Paramagnetic Palladacycles with PdIII Centers Are Highly Active Catalysts for Asymmetric Aza-Claisen Rearrangements. J Am Chem Soc 2012; 134:4683-93. [DOI: 10.1021/ja2098222] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Simon H. Eitel
- Institut für
Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Matthias Bauer
- Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger Straße Gebäude 54/684, 67663
Kaiserslautern, Germany
| | - David Schweinfurth
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Naina Deibel
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Biprajit Sarkar
- Institut für
Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Harald Kelm
- Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger Straße Gebäude 54/655, 67663
Kaiserslautern, Germany
| | - Hans-Jörg Krüger
- Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger Straße Gebäude 54/655, 67663
Kaiserslautern, 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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43
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Cannon JS, Frederich JH, Overman LE. Palladacyclic imidazoline-naphthalene complexes: synthesis and catalytic performance in Pd(II)-catalyzed enantioselective reactions of allylic trichloroacetimidates. J Org Chem 2012; 77:1939-51. [PMID: 22288535 DOI: 10.1021/jo2025724] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new family of air- and moisture-stable enantiopure C,N-palladacycles (PIN-acac complexes) were prepared in good overall yield in three steps from 2-iodo-1-naphthoic acid and enantiopure β-amino alcohols. Three of these PIN complexes were characterized by single-crystal X-ray analysis. As anticipated, the naphthalene and imidazoline rings of PIN-acac complexes 18a and 18b were canted significantly from planarity and projected the imidazoline substituents R(1) and R(2) on opposite faces of the palladium square plane. Fifteen PIN complexes were evaluated as catalysts for the rearrangement of prochiral (E)-allylic trichloroacetimidate 19 (eq 2) and the S(N)2' allylic substitution of acetic acid with prochiral (Z)-allylic trichloroacetimidate 23. Although these complexes were kinetically poor catalysts for the Overman rearrangement, they were good catalysts for the allylic substitution reaction, providing branched allylic esters in high yield. However, enantioselectivities were low to moderate and significantly less than that realized with palladacyclic complexes of the COP family. Computational studies support an anti-acetoxypalladation/syn-deoxypalladation mechanism analogous to that observed with COP catalysts. The computational study further suggests that optimizing steric influence in the vicinity of the carbon ligand of a chiral C,N-palladacycle, rather than near the nitrogen heterocycle, is the direction to pursue in future development of improved enantioselective catalysts of this motif.
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Affiliation(s)
- Jeffrey S Cannon
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025, USA
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44
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López C, González A, Bosque R, Basu PK, Font-Bardía M, Calvet T. Platinum(ii) and palladium(ii) complexes derived from 1-ferrocenylmethyl-3,5-diphenylpyrazole. Coordination, cyclometallation or transannulation? RSC Adv 2012. [DOI: 10.1039/c1ra01080h] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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45
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Ohara M, Nakamura S, Shibata N. Direct Enantioselective Three-Component Kabachnik-Fields Reaction Catalyzed by Chiral Bis(imidazoline)-Zinc(II) Catalysts. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100482] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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46
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Hyodo K, Nakamura S, Tsuji K, Ogawa T, Funahashi Y, Shibata N. Enantioselective Reaction of Imines and Benzyl Nitriles Using Palladium Pincer Complexes withC2-Symmetric Chiral Bis(imidazoline)s. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100626] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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47
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Peters R, Fischer DF, Jautze S. Ferrocene and Half Sandwich Complexes as Catalysts with Iron Participation. TOP ORGANOMETAL CHEM 2011. [DOI: 10.1007/978-3-642-14670-1_5] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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48
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Djukic JP, Iali W, Pfeffer M, Goff XFL. Charge-induced facial-selectivity in the formation of new cationic planar chiral iridacycles derived from aniline. Chem Commun (Camb) 2011; 47:3631-3. [DOI: 10.1039/c0cc05711h] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Weber M, Jautze S, Frey W, Peters R. Bispalladacycle-Catalyzed Brønsted Acid/Base-Promoted Asymmetric Tandem Azlactone Formation−Michael Addition. J Am Chem Soc 2010; 132:12222-5. [DOI: 10.1021/ja106088v] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manuel Weber
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Sascha Jautze
- 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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50
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Nomura H, Richards C. Allylic Imidate Rearrangements Catalyzed by Planar Chiral Palladacycles. Chem Asian J 2010; 5:1726-40. [DOI: 10.1002/asia.201000131] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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