1
|
Ibrahim H, Bala MD, Friedrich HB. Poly-functional imino-N-heterocyclic carbene ligands: Synthesis, complexation, and catalytic applications. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
2
|
Hahn E, Rupp S, Dutschke PD, Kinas J, Hepp A. Synthesis and Metallation of Unsymmetric Tetrakisimidazolium Macrocycles. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ekkehardt Hahn
- Westfalische Wilhelms Universitat Munster Department of Chemistry Corrensstraße 30 48149 Münster GERMANY
| | - Stefan Rupp
- Westfälische Wilhelms-Universität Münster: Westfalische Wilhelms-Universitat Munster Chemistry GERMANY
| | - Patrick D. Dutschke
- Westfälische Wilhelms-Universität Münster: Westfalische Wilhelms-Universitat Munster Chemistry GERMANY
| | - Jenny Kinas
- Westfälische Wilhelms-Universität Münster: Westfalische Wilhelms-Universitat Munster Chemistry GERMANY
| | - Alexander Hepp
- Westfälische Wilhelms-Universität Münster: Westfalische Wilhelms-Universitat Munster Chemistry GERMANY
| |
Collapse
|
3
|
Mikhaylov VN, Balova IA. Alternative Transformations of N-Heterocyclic Carbene Complexes of the Group 11 Metals in Transmetalation Reactions (A Review). RUSS J GEN CHEM+ 2021. [DOI: 10.1134/s1070363221110098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
4
|
Pickl T, Pöthig A. Bimetallic Platinum Group Complexes of a Macrocyclic Pyrazolate/NHC Hybrid Ligand. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas Pickl
- Catalysis Research Center & Department of Chemistry, Chair of Inorganic and Metal−Organic Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, D-85748 Garching b. München, Germany
| | - Alexander Pöthig
- Catalysis Research Center & Department of Chemistry, Chair of Inorganic and Metal−Organic Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, D-85748 Garching b. München, Germany
| |
Collapse
|
5
|
Jónsson HF, Orthaber A, Fiksdahl A. Studies on gold(I) and gold(III) alcohol functionalised NHC complexes. Dalton Trans 2021; 50:5128-5138. [PMID: 33720256 DOI: 10.1039/d1dt00387a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Five pairs of novel chiral alcohol functionalised gold(i) and gold(iii) NHC complexes derived from chiral amino alcohols, were synthesized and characterised (NMR, IR, HRMS). Single crystal X-ray diffraction data of gold(i) and gold(iii) complexes are reported and discussed. The chiral imidazolium preligands were readily synthesized via the oxalamides, subsequent reduction and final orthoformate condensation. An improved method was used for generation of gold(i) NHC complexes (up to 92%) and further oxidation afforded the corresponding gold(iii) NHC complexes (up to 99%). All the Au(i) and Au(iii) NHC complexes proved far more catalytically active in a 1,6-enyne alkoxycyclization test reaction than our previously tested N,N- and P,N-ligated Au(iii) complexes. Comparative gold(i) and gold(iii) catalytic studies demonstrated different catalytic ability, depending on the NHC ligand flexibility and bulkiness. Excellent yields (92-99%) of target alkoxycyclization product were obtained with both gold(i) and gold(iii) complexes with the bulky N1-Mes-N2-ethanol based NHC ligand.
Collapse
Affiliation(s)
- Helgi Freyr Jónsson
- Department of Chemistry, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
| | - Andreas Orthaber
- Department of Organic Chemistry - Ångström Laboratory, Uppsala University, Lägerhyddsvägen 1, 751 20, Uppsala, Sweden
| | - Anne Fiksdahl
- Department of Chemistry, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
| |
Collapse
|
6
|
Titze M, Heitkämper J, Junge T, Kästner J, Peters R. Highly Active Cooperative Lewis Acid-Ammonium Salt Catalyst for the Enantioselective Hydroboration of Ketones. Angew Chem Int Ed Engl 2021; 60:5544-5553. [PMID: 33210781 PMCID: PMC7986937 DOI: 10.1002/anie.202012796] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 11/16/2020] [Indexed: 11/25/2022]
Abstract
Enantiopure secondary alcohols are fundamental high-value synthetic building blocks. One of the most attractive ways to get access to this compound class is the catalytic hydroboration. We describe a new concept for this reaction type that allowed for exceptional catalytic turnover numbers (up to 15 400), which were increased by around 1.5-3 orders of magnitude compared to the most active catalysts previously reported. In our concept an aprotic ammonium halide moiety cooperates with an oxophilic Lewis acid within the same catalyst molecule. Control experiments reveal that both catalytic centers are essential for the observed activity. Kinetic, spectroscopic and computational studies show that the hydride transfer is rate limiting and proceeds via a concerted mechanism, in which hydride at Boron is continuously displaced by iodide, reminiscent to an SN 2 reaction. The catalyst, which is accessible in high yields in few steps, was found to be stable during catalysis, readily recyclable and could be reused 10 times still efficiently working.
Collapse
Affiliation(s)
- Marvin Titze
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - Juliane Heitkämper
- Universität StuttgartInstitut für Theoretische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - Thorsten Junge
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - Johannes Kästner
- Universität StuttgartInstitut für Theoretische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - René Peters
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| |
Collapse
|
7
|
Titze M, Heitkämper J, Junge T, Kästner J, Peters R. Highly Active Cooperative Lewis Acid—Ammonium Salt Catalyst for the Enantioselective Hydroboration of Ketones. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202012796] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Marvin Titze
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Juliane Heitkämper
- Universität Stuttgart Institut für Theoretische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Thorsten Junge
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Johannes Kästner
- Universität Stuttgart Institut für Theoretische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| | - René Peters
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| |
Collapse
|
8
|
Miskov‐Pajic V, Willig F, Wanner DM, Frey W, Peters R. Enantiodivergent [4+2] Cycloaddition of Dienolates by Polyfunctional Lewis Acid/Zwitterion Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009093] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Vukoslava Miskov‐Pajic
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Felix Willig
- Universität Stuttgart Institut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Daniel M. Wanner
- 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
| |
Collapse
|
9
|
Miskov‐Pajic V, Willig F, Wanner DM, Frey W, Peters R. Enantiodivergent [4+2] Cycloaddition of Dienolates by Polyfunctional Lewis Acid/Zwitterion Catalysis. Angew Chem Int Ed Engl 2020; 59:19873-19877. [PMID: 32697020 PMCID: PMC7693193 DOI: 10.1002/anie.202009093] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Indexed: 12/23/2022]
Abstract
Diels-Alder reactions have become established as one of the most effective ways to prepare stereochemically complex six-membered rings. Different catalysis concepts have been reported, including dienophile activation by Lewis acids or H-bond donors and diene activation by bases. Herein we report a new concept, in which an acidic prodiene is acidified by a Lewis acid to facilitate deprotonation by an imidazolium-aryloxide entity within a polyfunctional catalyst. A metal dienolate is thus formed, while an imidazolium-ArOH moiety probably forms hydrogen bonds with the dienophile. The catalyst type, readily prepared in few steps in high overall yield, was applied to 3-hydroxy-2-pyrone and 3-hydroxy-2-pyridone as well as cyclopentenone prodienes. Maleimide, maleic anhydride, and nitroolefin dienophiles were employed. Kinetic, spectroscopic, and control experiments support a cooperative mode of action. High enantioselectivity was observed even with unprecedented TONs of up to 3680.
Collapse
Affiliation(s)
- Vukoslava Miskov‐Pajic
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - Felix Willig
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - Daniel M. Wanner
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - Wolfgang Frey
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| | - René Peters
- Universität StuttgartInstitut für Organische ChemiePfaffenwaldring 5570569StuttgartGermany
| |
Collapse
|
10
|
Chernyshev VM, Denisova EA, Eremin DB, Ananikov VP. The key role of R-NHC coupling (R = C, H, heteroatom) and M-NHC bond cleavage in the evolution of M/NHC complexes and formation of catalytically active species. Chem Sci 2020; 11:6957-6977. [PMID: 33133486 PMCID: PMC7553045 DOI: 10.1039/d0sc02629h] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 06/19/2020] [Indexed: 02/01/2023] Open
Abstract
Complexes of metals with N-heterocyclic carbene ligands (M/NHC) are typically considered the systems of choice in homogeneous catalysis due to their stable metal-ligand framework. However, it becomes obvious that even metal species with a strong M-NHC bond can undergo evolution in catalytic systems, and processes of M-NHC bond cleavage are common for different metals and NHC ligands. This review is focused on the main types of the M-NHC bond cleavage reactions and their impact on activity and stability of M/NHC catalytic systems. For the first time, we consider these processes in terms of NHC-connected and NHC-disconnected active species derived from M/NHC precatalysts and classify them as fundamentally different types of catalysts. Problems of rational catalyst design and sustainability issues are discussed in the context of the two different types of M/NHC catalysis mechanisms.
Collapse
Affiliation(s)
- Victor M Chernyshev
- Platov South-Russian State Polytechnic University (NPI) , Prosveschenya 132 , Novocherkassk , 346428 , Russia
| | - Ekaterina A Denisova
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospect 47 , 119991 Moscow , Russian Federation
| | - Dmitry B Eremin
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospect 47 , 119991 Moscow , Russian Federation
- The Bridge@USC , University of Southern California , 1002 Childs Way , Los Angeles , California 90089-3502 , USA
| | - Valentine P Ananikov
- Platov South-Russian State Polytechnic University (NPI) , Prosveschenya 132 , Novocherkassk , 346428 , Russia
- N. D. Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospect 47 , 119991 Moscow , Russian Federation
| |
Collapse
|
11
|
Satake A, Katagami Y, Odaka Y, Kuramochi Y, Harada S, Kouchi T, Kamebuchi H, Tadokoro M. Synthesis of Double-Bridged Cofacial Nickel Porphyrin Dimers with 2,2'-Bipyridyl Pillars and Their Restricted Coordination Space. Inorg Chem 2020; 59:8013-8024. [PMID: 32441925 DOI: 10.1021/acs.inorgchem.0c00177] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Double-bridged cofacial Ni porphyrin dimers 2 with 2,2'-bipyridyl pillars were effectively prepared by a one-step reductive homocoupling reaction of bis(chloropyridyl)-substituted Ni porphyrin derivatives followed by a specific separation of a cyanopropyl-modified silica gel column using pyridine eluent systems. The structural analyses of 2 and its Pd complex were carried out in their solid and solution states by means of X-ray single crystal analysis and NMR, respectively. The complexation of η3-allylpalladium chloride (Pd) with 2 on the spatially restricted 2,2-bipyridine moieties on 2 gave a 2:1 (Pd:2) complex, in which the 2,2'-bipyridine ligands only provided one of the N atoms on a 2,2'-bipyridine ligand to a Pd. Therefore, the 2,2-bipyridine moieties acted as a monodentate ligand.
Collapse
Affiliation(s)
- Akiharu Satake
- Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.,Department of Chemistry, Faculty of Science Division II, Tokyo University of Science, Tokyo, Japan
| | - Yuta Katagami
- Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Yuki Odaka
- Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Yusuke Kuramochi
- Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.,Department of Chemistry, Faculty of Science Division II, Tokyo University of Science, Tokyo, Japan
| | - Shohei Harada
- Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Takaya Kouchi
- Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Hajime Kamebuchi
- Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.,Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, Tokyo, Japan
| | - Makoto Tadokoro
- Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.,Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, Tokyo, Japan
| |
Collapse
|
12
|
DeJesus JF, Jenkins DM. A Chiral Macrocyclic Tetra-N-Heterocyclic Carbene Yields an "All Carbene" Iron Alkylidene Complex. Chemistry 2020; 26:1429-1435. [PMID: 31788868 PMCID: PMC7024548 DOI: 10.1002/chem.201905360] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Indexed: 01/12/2023]
Abstract
The first chiral macrocyclic tetra-N-heterocyclic carbene (NHC) ligand has been synthesized. The macrocycle, prepared in high yield and large scale, was ligated onto palladium and iron to give divalent C2 -symmetric square planar complexes. Multinuclear NMR and single crystal X-ray diffraction demonstrated that there are two distinct NHCs on each ligand, due to the bridging chiral cyclohexane. Oxidation of the iron(II) complex with trimethylamine N-oxide yielded a bridging oxo complex. Diazodiphenylmethane reacted with the iron(II) complex at room temperature to give a paramagnetic diazoalkane complex; the same reaction yielded the "all carbene" complex at elevated temperature. Electrochemical measurements support the assignment of the "all carbene" complex being an alkylidene. Notably, the diazoalkane complex can be directly transformed into the alkylidene complex, which had not been previously demonstrated on iron. Finally, a test catalytic reaction with a diazoalkane on the iron(II) complex does not yield the expected cyclopropane, but actually the azine compound.
Collapse
Affiliation(s)
- Joseph F DeJesus
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA
| | - David M Jenkins
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA
| |
Collapse
|
13
|
Darvasiová D, Šoral M, Puškárová I, Dvoranová D, Vénosová B, Bučinský L, Zalibera M, Dujnič V, Dobrov A, Schwalbe M, Arion VB, Rapta P. Spectroelectrochemical, photochemical and theoretical study of octaazamacrocyclic nickel(II) complexes exhibiting unusual solvent-dependent deprotonation of methylene group. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.135006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
14
|
Willig F, Lang J, Hans AC, Ringenberg MR, Pfeffer D, Frey W, Peters R. Polyfunctional Imidazolium Aryloxide Betaine/Lewis Acid Catalysts as Tools for the Asymmetric Synthesis of Disfavored Diastereomers. J Am Chem Soc 2019; 141:12029-12043. [DOI: 10.1021/jacs.9b04902] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Felix Willig
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Johannes Lang
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Andreas C. Hans
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Mark R. Ringenberg
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Daniel 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
| |
Collapse
|
15
|
Abd El Sater M, Jaber N, Schulz E. Chiral Salen Complexes for Asymmetric Heterogeneous Catalysis: Recent Examples for Recycling and Cooperativity. ChemCatChem 2019. [DOI: 10.1002/cctc.201900557] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mariam Abd El Sater
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182Université Paris-Sud, Université Paris-Saclay Bâtiment 420 91405 Orsay France
- Laboratoire de Chimie Médicinale et des Produits NaturelsUniversité Libanaise, Faculté des Sciences (I) et PRASE-EDST Hadath Beyrouth Lebanon
| | - Nada Jaber
- Laboratoire de Chimie Médicinale et des Produits NaturelsUniversité Libanaise, Faculté des Sciences (I) et PRASE-EDST Hadath Beyrouth Lebanon
| | - Emmanuelle Schulz
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182Université Paris-Sud, Université Paris-Saclay Bâtiment 420 91405 Orsay France
| |
Collapse
|
16
|
Majumdar D, Das S, Thomas R, Ullah Z, Sreejith S, Das D, Shukla P, Bankura K, Mishra D. Syntheses, X-ray crystal structures of two new Zn(II)-dicyanamide complexes derived from H2vanen-type compartmental ligands: Investigation of thermal, photoluminescence, in vitro cytotoxic effect and DFT-TDDFT studies. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.04.041] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
17
|
Schmid J, Junge T, Lang J, Frey W, Peters R. Polyfunktionelle Bis‐Lewis‐Säure‐/Bis‐Triazolium‐Katalysatoren zur stereoselektiven 1,4‐Addition von 2‐Oxindolen an Maleimide. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814453] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Juliane Schmid
- Universität StuttgartInstitut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Thorsten Junge
- Universität StuttgartInstitut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Johannes Lang
- Universität StuttgartInstitut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - Wolfgang Frey
- Universität StuttgartInstitut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Deutschland
| | - René Peters
- Universität StuttgartInstitut für Organische Chemie Pfaffenwaldring 55 70569 Stuttgart Deutschland
| |
Collapse
|
18
|
Schmid J, Junge T, Lang J, Frey W, Peters R. Polyfunctional Bis-Lewis-Acid-/Bis-Triazolium Catalysts for Stereoselective 1,4-Additions of 2-Oxindoles to Maleimides. Angew Chem Int Ed Engl 2019; 58:5447-5451. [PMID: 30742732 DOI: 10.1002/anie.201814453] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Indexed: 01/19/2023]
Abstract
Achieving enzyme-like catalytic activity and stereoselectivity without the typically high substrate specificity of enzymes is a challenge in the development of artificial catalysts for asymmetric synthesis. Polyfunctional catalysts are considered to be a promising tool for achieving excellent catalytic efficiency. A polyfunctional catalyst system was developed, which incorporates two Lewis acidic/Brønsted basic cobalt centers in combination with triazolium moieties that are crucial for high reactivity and excellent stereoselectivity in the direct 1,4-addition of oxindoles to maleimides. The catalyst is assembled through click chemistry and is readily recyclable through precipitation by making use of its charges. Kinetic studies support a cooperative mode of action. Diastereodivergency is achievable with either Boc-protected or unprotected maleimide.
Collapse
Affiliation(s)
- Juliane Schmid
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Thorsten Junge
- Universität Stuttgart, Institut für Organische Chemie, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Johannes Lang
- 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
| |
Collapse
|
19
|
Transfer hydrogenation of ketones catalyzed by a trinuclear Ni(II) complex of a Schiff base functionalized N-heterocyclic carbene ligand. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.09.057] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
20
|
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.
Collapse
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
| |
Collapse
|
21
|
Ai P, Monakhov KY, van Leusen J, Kögerler P, Gourlaouen C, Tromp M, Welter R, Danopoulos AA, Braunstein P. Linear Cu I2 Pd 0 , Cu I Pd 02 , and Ag I2 Pd 0 Metal Chains Supported by Rigid N,N'-Diphosphanyl N-Heterocyclic Carbene Ligands and Metallophilic Interactions. Chemistry 2018; 24:8787-8796. [PMID: 29869809 DOI: 10.1002/chem.201801170] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 04/16/2018] [Indexed: 01/18/2023]
Abstract
Selective copper(I) to palladium(0) transmetallation of P-donors from the rigid N,N'-diphosphanyl-imidazol-2-ylidene C3 H2 [NP(tBu)2 ]2 (PCNHC P) was observed when known [Cu3 (μ3 -PCNHC P,κP,κCNHC ,κP)2 ](OTf)3 was reacted with [Pd(PPh3 )4 ]. When 1.2 equivalents of [Pd(PPh3 )4 ] was used, the product [Cu2 Pd(μ3 -PCNHC P,κP,κCNHC ,κP)2 ](OTf)2 (2(OTf)2 ) was obtained, which features a CuI -CuI -Pd0 chain and appears to be the first linear heterotrinuclear complex with d10 -d10 interactions between Pd0 and CuI . When the Cu3 precursor was reacted with 3.0 equivalents of [Pd(PPh3 )4 ], the complex [CuPd2 (μ3 -PCNHC P,κP,κCNHC ,κP)2 ](OTf)2 (3(OTf)2 ) was obtained, which, on the basis of magnetic measurements, DFT calculations, and computed nuclear shieldings, was formulated as containing a Pd0 -CuI -Pd0 chain with an electron hole delocalized over the whole cation, including the metal chain. Similarly, selective transmetallation of the P-donors in [Ag3 (μ3 -PCNHC P,κP,κCNHC ,κP)2 ](OTf)3 from silver to palladium (originating from [Pd(PPh3 )4 ]) gave the linear chain [Ag2 Pd(μ3 -PCNHC P,κP,κCNHC ,κP)2 ](OTf)2 (5(OTf)2 ), which on the basis of NMR spectroscopy comprises an AgI -AgI -Pd0 metal core. However, X-ray diffraction data collected on various samples of 5(OTf)2 were modeled with 50:50 metal disorder at the terminal positions, corresponding to a (AgI /Pd0 )-AgI -(AgI /Pd0 ) formulation. Upon standing in solution, 5(OTf)2 transformed to 6(OTf)2 , the regioisomer of 5(OTf)2 in which the Pd center has migrated to the central position of an AgI -Pd0 -AgI chain. Prolonged standing in CH2 Cl2 or by reaction with [PtCl2 (NCMe)2 ] converts complex 6(OTf)2 to the AgI /PdII complex [Ag2 PdCl2 (μ3 -PCNHC P,κP,κCNHC ,κP)2 ](OTf)2 (7(OTf)2 ). The structural data of 2(OTf)2 , 3(OTf)2 , and 7(OTf)2 establish significant heterometallophilic interactions.
Collapse
Affiliation(s)
- Pengfei Ai
- Université de Strasbourg, CNRS, Chimie UMR 7177, Laboratoire de Chimie de Coordination, 4 rue Blaise Pascal, 67081, Strasbourg Cedex, France
| | - Kirill Yu Monakhov
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Jan van Leusen
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Paul Kögerler
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany.,Jülich-Aachen Research Alliance (JARA-FIT) and Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich, 52425, Jülich, Germany
| | - Christophe Gourlaouen
- Université de Strasbourg, CNRS, Chimie UMR 7177, Laboratoire de Chimie Quantique, 1 rue Blaise Pascal, 67081, Strasbourg Cedex, France
| | - Moniek Tromp
- Sustainable Materials Characterization, Van t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1090 GE, Amsterdam, The Netherlands
| | - Richard Welter
- Université de Strasbourg, CNRS, Chimie UMR 7177, Laboratoire DECOMET, 4 rue Blaise Pascal, 67081, Strasbourg Cedex, France.,Université de Strasbourg, CNRS, Institut de biologie moléculaire des plantes, 12 rue du général Zimmer, 67084, Strasbourg cedex, France
| | - Andreas A Danopoulos
- Université de Strasbourg, CNRS, Chimie UMR 7177, Laboratoire de Chimie de Coordination, 4 rue Blaise Pascal, 67081, Strasbourg Cedex, France.,Institute for Advanced Study, USIAS, Université de Strasbourg, France.,Laboratory of Inorganic Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens GR, 15771, Greece
| | - Pierre Braunstein
- Université de Strasbourg, CNRS, Chimie UMR 7177, Laboratoire de Chimie de Coordination, 4 rue Blaise Pascal, 67081, Strasbourg Cedex, France
| |
Collapse
|
22
|
Fei F, Lu T, Yang C, Chen X, Xue Z. Synthesis, Structures, and Catalytic Properties of Dinuclear Iridium(I) Complexes with a Hexadentate Macrocyclic Diamine‐Tetracarbene Ligand. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800088] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Fan Fei
- State Key Laboratory of Coordination Chemistry Nanjing National Laboratory of Microstructures School of Chemistry and Chemical Engineering Nanjing University 210023 Nanjing P. R. China
| | - Taotao Lu
- State Key Laboratory of Coordination Chemistry Nanjing National Laboratory of Microstructures School of Chemistry and Chemical Engineering Nanjing University 210023 Nanjing P. R. China
| | - Chu‐Fan Yang
- State Key Laboratory of Coordination Chemistry Nanjing National Laboratory of Microstructures School of Chemistry and Chemical Engineering Nanjing University 210023 Nanjing P. R. China
| | - Xue‐Tai Chen
- State Key Laboratory of Coordination Chemistry Nanjing National Laboratory of Microstructures School of Chemistry and Chemical Engineering Nanjing University 210023 Nanjing P. R. China
| | - Zi‐Ling Xue
- Department of Chemistry University of Tennessee 37996 Knoxville Tennessee USA
| |
Collapse
|
23
|
Hameury S, de Frémont P, Braunstein P. Metal complexes with oxygen-functionalized NHC ligands: synthesis and applications. Chem Soc Rev 2018; 46:632-733. [PMID: 28083579 DOI: 10.1039/c6cs00499g] [Citation(s) in RCA: 150] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Ligand design has met with considerable success with both categories of hybrid ligands, which are characterized by chemically different donor groups, and of N-heterocyclic carbenes (NHCs). Their spectacular development and diversity are attracting worldwide interest and offers almost unlimited diversity and potential in e.g. coordination/organometallic main group and transition metal chemistry, catalysis, medicinal chemistry and materials science. This review aims at providing a comprehensive update on a specific class of ligands that has enjoyed much attention in the past few years, at the intersection between the two categories mentioned above, that of hybrid NHC ligands in which the functionality associated with the carbene donor is of the oxygen-donor type. For each type of oxygen-donor present in such chelating (Section 1) or bridging (Section 2) hybrid ligands, we will examine the synthesis, structures and reactivity of their metal complexes and their applications, with a special focus on homogeneous catalysis (Section 3). Thus, hydrogenation, C-H bond activation, C-C, C-N, C-O bond formation, hydrolysis of silanes, oligomerization, polymerization, metathesis, hydrosilylation, C-C bond cleavage, acceptorless dehydrogenation, dehalogenation/hydrogen transfer, oxidation and reduction reactions will be successively presented in a tabular manner, to facilitate an overview and a rapid identification of the relevant publications describing which metals associated with a given oxygen functionality are most suitable. The literature coverage includes the year 2015.
Collapse
Affiliation(s)
- Sophie Hameury
- Université de Strasbourg, CNRS, CHIMIE UMR 7177, Laboratoire de Chimie de Coordination, 4 rue Blaise Pascal, 67081 Strasbourg, France. and Universität Freiburg, Makromolekulare Chemie, Stefan-Meier-Str. 31, 79104 Freiburg, Germany
| | - Pierre de Frémont
- Université de Strasbourg, CNRS, CHIMIE UMR 7177, Laboratoire de Chimie de Coordination, 4 rue Blaise Pascal, 67081 Strasbourg, France. and Université de Strasbourg, CNRS, CHIMIE UMR 7177, Laboratoire de Synthèse, Réactivité et Catalyse Organométalliques, 4 rue Blaise Pascal, 67081 Strasbourg, France
| | - Pierre Braunstein
- Université de Strasbourg, CNRS, CHIMIE UMR 7177, Laboratoire de Chimie de Coordination, 4 rue Blaise Pascal, 67081 Strasbourg, France.
| |
Collapse
|
24
|
Schmid J, Frey W, Peters R. Polynuclear Enantiopure Salen–Mesoionic Carbene Hybrid Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00729] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Juliane Schmid
- 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
| |
Collapse
|
25
|
Lu T, Yang CF, Zhang LY, Fei F, Chen XT, Xue ZL. Metal Complexes with a Hexadentate Macrocyclic Diamine-Tetracarbene Ligand. Inorg Chem 2017; 56:11917-11928. [DOI: 10.1021/acs.inorgchem.7b01896] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Taotao Lu
- State Key Laboratory
of Coordination Chemistry, Nanjing National Laboratory of Microstructures,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Chu-Fan Yang
- State Key Laboratory
of Coordination Chemistry, Nanjing National Laboratory of Microstructures,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Li-Yi Zhang
- State Key Laboratory
of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Fuzhou 350002, P. R. China
| | - Fan Fei
- State Key Laboratory
of Coordination Chemistry, Nanjing National Laboratory of Microstructures,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Xue-Tai Chen
- State Key Laboratory
of Coordination Chemistry, Nanjing National Laboratory of Microstructures,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Zi-Ling Xue
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
| |
Collapse
|
26
|
Griffiths K, Tsipis AC, Kumar P, Townrow OPE, Abdul-Sada A, Akien GR, Baldansuren A, Spivey AC, Kostakis GE. 3d/4f Coordination Clusters as Cooperative Catalysts for Highly Diastereoselective Michael Addition Reactions. Inorg Chem 2017; 56:9563-9573. [DOI: 10.1021/acs.inorgchem.7b01011] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kieran Griffiths
- Department of Chemistry,
School of Life Sciences, University of Sussex, Brighton BN1 9QJ, U.K
| | - Athanassios C. Tsipis
- Laboratory of Inorganic and General Chemistry,
Department of Chemistry, University of Ioannina, 451 10 Ioannina, Greece
| | - Prashant Kumar
- Department of Chemistry,
School of Life Sciences, University of Sussex, Brighton BN1 9QJ, U.K
| | - Oliver P. E. Townrow
- Department of Chemistry,
School of Life Sciences, University of Sussex, Brighton BN1 9QJ, U.K
| | - Alaa Abdul-Sada
- Department of Chemistry,
School of Life Sciences, University of Sussex, Brighton BN1 9QJ, U.K
| | - Geoffrey R. Akien
- Department of Chemistry, Lancaster University, Lancaster LA1 4YB, U.K
| | | | - Alan C. Spivey
- Department of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K
| | - George E. Kostakis
- Department of Chemistry,
School of Life Sciences, University of Sussex, Brighton BN1 9QJ, U.K
| |
Collapse
|
27
|
Feng X, Wu KY, Xie SY, Li R, Wang L. A heterometallic polymer based on bis-salicylidene Schiff base ligand, synthesis, electronic chemistry, and antibacterial property. INORG NANO-MET CHEM 2017. [DOI: 10.1080/24701556.2017.1284102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Xun Feng
- College of Chemistry and Chemical Engineering and Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang Normal University, Luoyang, China
| | - Kong Yang Wu
- College of Life Science, Luoyang Normal University, Luoyang, China
| | - Shi Yu Xie
- College of Chemistry and Chemical Engineering and Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang Normal University, Luoyang, China
| | - RongFang Li
- College of Chemistry and Chemical Engineering and Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang Normal University, Luoyang, China
| | - LiYa Wang
- College of Chemistry and Chemical Engineering and Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang Normal University, Luoyang, China
- School of Life Science and Technology, Nanyang Normal University, Nanyang, China
| |
Collapse
|
28
|
Latendorf K, Mechler M, Schamne I, Mack D, Frey W, Peters R. Titanium Salen Complexes with Appended Silver NHC Groups as Nucleophilic Carbene Reservoir for Cooperative Asymmetric Lewis Acid/NHC Catalysis. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700436] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Katja Latendorf
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Melanie Mechler
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Irina Schamne
- Institut für Organische Chemie; Universität Stuttgart; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Daniel Mack
- 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
| |
Collapse
|
29
|
Charra V, de Frémont P, Braunstein P. Multidentate N-heterocyclic carbene complexes of the 3d metals: Synthesis, structure, reactivity and catalysis. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.007] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
30
|
Pan R, Zhang J, Zheng C, Wang H, Cao D, Cao W, Zhao G. Enantioselective direct Mannich reaction of functionalized acetonitrile to N -Boc imines catalyzed by quaternary phosphonium catalysis. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.03.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
31
|
Fei F, Lu T, Chen XT, Xue ZL. Synthesis and structural characterization of metal complexes with macrocyclic tetracarbene ligands. NEW J CHEM 2017. [DOI: 10.1039/c7nj02485a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fourteen Ag(i), Au(i), Ni(ii), Pd(ii) and Pt(ii) complexes were prepared with macrocyclic tetradentate N-heterocyclic carbene (NHC) ligands.
Collapse
Affiliation(s)
- Fan Fei
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Taotao Lu
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Zi-Ling Xue
- Department of Chemistry
- University of Tennessee
- Knoxville
- USA
| |
Collapse
|
32
|
Mechler M, Peters R. Diastereodivergent Asymmetric 1,4-Addition of Oxindoles to Nitroolefins by Using Polyfunctional Nickel-Hydrogen-Bond-Azolium Catalysts. Angew Chem Int Ed Engl 2015; 54:10303-7. [DOI: 10.1002/anie.201502930] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Indexed: 12/29/2022]
|
33
|
Mechler M, Peters R. Diastereodivergente asymmetrische 1,4-Addition von Oxindolen an Nitroolefine durch polyfunktionelle Nickel-H-Brücken-Azolium- Katalysatoren. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502930] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|