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Plevová K, Pabon LJP, Gaysinski M, Poulain-Martini S, Michelet V. Phosphorous NMR Analysis and Activity of Chiral BINAP‐Silver Complexes. Chempluschem 2022; 87:e202200217. [DOI: 10.1002/cplu.202200217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 09/03/2022] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | - Veronique Michelet
- University of Cote d'Azur Faculty of Sciences: Universite Cote d'Azur Faculte des Sciences CHEMISTRY Parc Valrose 06100 NICE FRANCE
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2
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Fernández-Fariña S, Martínez-Calvo M, Maneiro M, Seco JM, Zaragoza G, González-Noya AM, Pedrido R. Two Synthetic Approaches to Coinage Metal(I) Mesocates: Electrochemical versus Chemical Synthesis. Inorg Chem 2022; 61:14121-14130. [PMID: 35984909 PMCID: PMC9455603 DOI: 10.1021/acs.inorgchem.2c02243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report two different approaches to isolate neutral and cationic mesocate-type metallosupramolecular architectures derived from coinage monovalent ions. For this purpose, we use a thiocarbohydrazone ligand, H2L (1), conveniently tuned with bulky phosphine groups to stabilize the MI ions and prevent ligand crossing to achieve the selective formation of mesocates. The neutral complexes [Cu2(HL)2] (2), [Ag2(HL)2] (3), and [Au2(HL)2] (4) were prepared by an electrochemical method, while the cationic complexes [Cu2(H2L)2](PF6)2 (5), [Cu2(H2L)2](BF4)2 (6), [Ag2(H2L)2](PF6)2 (7), [Ag4(HL)2](NO3)2 (8), and [Au2(H2L)2]Cl2 (9) were obtained by using a metal salt as the precursor. All of the complexes are neutral or cationic dinuclear mesocates, except the silver nitrate derivative, which exhibits a tetranuclear cluster mesocate architecture. The crystal structures of the neutral and cationic copper(I), silver(I), and gold(I) complexes allow us to analyze the influence of synthetic methodology or the counterion role on both the micro- and macrostructures of the mesocates.
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Affiliation(s)
- Sandra Fernández-Fariña
- Departamento de Química Inorgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Miguel Martínez-Calvo
- Departamento de Química Inorgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Marcelino Maneiro
- Departamento de Química Inorgánica, Facultade de Ciencias, Campus Terra, Universidade de Santiago de Compostela, 27002 Lugo, Spain
| | - José M Seco
- Departamento de Química Orgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Guillermo Zaragoza
- Unidade de Difracción de Raios X, Edificio CACTUS, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Ana M González-Noya
- Departamento de Química Inorgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Rosa Pedrido
- Departamento de Química Inorgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
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3
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Yamashita Y, Yasukawa T, Yoo WJ, Kitanosono T, Kobayashi S. Catalytic enantioselective aldol reactions. Chem Soc Rev 2018; 47:4388-4480. [DOI: 10.1039/c7cs00824d] [Citation(s) in RCA: 165] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Recent developments in catalytic asymmetric aldol reactions have been summarized.
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Affiliation(s)
- Yasuhiro Yamashita
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Tomohiro Yasukawa
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Woo-Jin Yoo
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Taku Kitanosono
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Shū Kobayashi
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
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4
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Lestari WW, Lönnecke P, Hey-Hawkins E. Noble Metal Complexes with 4, 4′- and 5, 5′-Pyridyl-Functionalized ( S)-2, 2′-Bis(diphenylphosphanyl)-1, 1′-binaphthyl Ligands. Z Anorg Allg Chem 2014. [DOI: 10.1002/zaac.201400088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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5
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Trivedi M, Bhaskaran, Singh G, Kumar A, Rath NP. Synthesis, spectral and structural studies of silver and gold(I) complexes containing some symmetrical diphosphine ligands. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.01.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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6
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Sutar RL, Joshi NN. Base-catalyzed Mukaiyama-type aldol additions, a continued quest for stereoselectivity. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.09.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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7
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Hurem D, Moiseev AG, Simionescu R, Dudding T. A detailed NMR- and DFT-based study of the Sakurai-Hosomi-Yamamoto asymmetric allylation reaction. J Org Chem 2013; 78:4440-5. [PMID: 23570439 DOI: 10.1021/jo400451u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A Lewis acid complex between benzaldehyde and the silver catalyst was detected by (31)P NMR and shown to be the direct precursor to allylation within the Sakurai-Hosomi-Yamamoto reaction. Structural and thermochemical hybrid-DFT calculations indicated that benzaldehyde predominantly formed an η(1)-σ-complex with the catalyst; however, two other competing conformers involving different coordination modes were found, including an activated μ(2)-bound complex. The differences in (31)P NMR shifts upon complexation were calculated by the gauge-independent atomic orbital (GIAO-DFT) method for each conformer. The minimum energy conformer was found to correlate well with chemical shift trends observed experimentally, and an analysis of Mullikan charge populations revealed that the carbonyl carbon of the highest-energy conformer was the most electron-deficient. Furthermore, one minor and three major silicon intermediates were detected by (29)Si NMR and, with the aid of (1)H-(29)Si HSQC, were assigned by comparison with parent compounds and GIAO-DFT calculations. Finally, a tentative mechanism was proposed based on these findings.
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Affiliation(s)
- David Hurem
- Department of Chemistry, Brock University, 500 Glenridge Avenue, St. Catharines L2S 3A1, ON, Canada
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8
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McNulty J, Keskar K, Vemula R. The first well-defined silver(I)-complex-catalyzed cycloaddition of azides onto terminal alkynes at room temperature. Chemistry 2011; 17:14727-30. [PMID: 22125272 DOI: 10.1002/chem.201103244] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2011] [Indexed: 11/07/2022]
Affiliation(s)
- James McNulty
- Department of Chemistry and Chemical-Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4M1, Canada.
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9
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Dang TT, Boeck F, Hintermann L. Hidden Brønsted Acid Catalysis: Pathways of Accidental or Deliberate Generation of Triflic Acid from Metal Triflates. J Org Chem 2011; 76:9353-61. [DOI: 10.1021/jo201631x] [Citation(s) in RCA: 236] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tuan Thanh Dang
- Department Chemie, Technische Universität München, Lichtenbergstrasse
4, 85748 Garching b. München, Germany
| | - Florian Boeck
- Department Chemie, Technische Universität München, Lichtenbergstrasse
4, 85748 Garching b. München, Germany
| | - Lukas Hintermann
- Department Chemie, Technische Universität München, Lichtenbergstrasse
4, 85748 Garching b. München, Germany
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10
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Yamashita Y, Imaizumi T, Guo XX, Kobayashi S. Chiral silver amides as effective catalysts for enantioselective [3+2] cycloaddition reactions. Chem Asian J 2011; 6:2550-9. [PMID: 21780291 DOI: 10.1002/asia.201100246] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Indexed: 11/10/2022]
Abstract
Asymmetric [3+2] cycloaddition of α-aminoester Schiff bases with substituted olefins is one of the most efficient methods for the preparation of chiral pyrrolidine derivatives in optically pure form. In spite of its potential utility, applicable substrates for this method have been limited to Schiff bases that bear relatively acidic α-hydrogen atoms. Here we report a chiral silver amide complex for asymmetric [3+2] cycloaddition reactions. A silver complex prepared from silver bis(trimethylsilyl)amide (AgHMDS) and (R)-DTBM-SEGPHOS worked well in asymmetric [3+2] cycloaddition reactions of α-aminoester Schiff bases with several olefins to afford the corresponding pyrrolidine derivatives in high yields with remarkable exo- and enantioselectivities. Furthermore, α-aminophosphonate Schiff bases, which have less acidic α-hydrogen atoms, also reacted with olefins with high exo- and enantioselectivities. The stereoselectivities of the [3+2] cycloadditions with maleate and fumarate suggested that the reaction proceeded by means of a concerted mechanism. An NMR spectroscopic study indicated that complexation of AgHMDS with the bisphosphine ligand was not complete, and that free AgHMDS, which did not show any significant catalytic activity, existed in the catalyst solution. This means that significant ligand acceleration occurred in the current reaction system.
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Affiliation(s)
- Yasuhiro Yamashita
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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11
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Liu Y, Shang D, Zhou X, Zhu Y, Lin L, Liu X, Feng X. AgAsF6/Sm(OTf)3 promoted reversal of enantioselectivity for the asymmetric Friedel-Crafts alkylations of indoles with beta,gamma-unsaturated alpha-ketoesters. Org Lett 2010; 12:180-3. [PMID: 19938840 DOI: 10.1021/ol902587t] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first example of central metal controlled reversal of enantioselectivity in asymmetric Friedel-Crafts alkylation of indoles and beta,gamma-unsaturated alpha-ketoesters has been developed. Using the same chiral starting material derived N,N'-dioxides 1a and 1b as ligands, various indole esters 4 were obtained in good to excellent yields and enantioselectivities. The reaction also featured mild reaction conditions and remarkably low catalyst loading (down to 0.01 mol %).
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Affiliation(s)
- Yanling Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
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12
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Wieland LC, Vieira EM, Snapper ML, Hoveyda AH. Ag-catalyzed diastereo- and enantioselective vinylogous Mannich reactions of alpha-ketoimine esters. Development of a method and investigation of its mechanism. J Am Chem Soc 2009; 131:570-6. [PMID: 18980303 DOI: 10.1021/ja8062315] [Citation(s) in RCA: 154] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient diastereo- and enantioselective Ag-catalyzed method for additions of a commercially available siloxyfuran to alpha-ketoimine esters is disclosed. Catalytic transformations require an inexpensive metal salt (AgOAc) and an air stable chiral ligand that is prepared in three steps from commercially available materials in 42% overall yield. Aryl- as well as heterocyclic substituted ketoimines can be used effectively in the Ag-catalyzed process. Additionally, two examples regarding reactions of alkyl-substituted ketoimines are presented. An electronically modified N-aryl group is introduced that is responsible for high reaction efficiency (>98% conversion, 72-95% yields after purification) as well as diastereo- (up to >98:2 dr) and enantioselectivity (up to 97:3 er or 94% ee). The new N-aryl unit is crucial for conversion of the asymmetric vinylogous Mannich (AVM) products to the unprotected amines in high yields. Spectroscopic and X-ray data are among the physical evidence provided that shed light on the identity of the Ag-based chiral catalysts and some of the mechanistic subtleties of this class of enantioselective C-C bond forming processes.
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Affiliation(s)
- Laura C Wieland
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA
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14
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Affiliation(s)
- Marina Naodovic
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
| | - Hisashi Yamamoto
- Department of Chemistry, The University of Chicago, Chicago, Illinois 60637
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15
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16
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17
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Doherty S, Goodrich P, Hardacre C, Pârvulescu V, Paun C. Efficient Heterogeneous Asymmetric Catalysis of the Mukaiyama Aldol Reaction by Silica- and Ionic Liquid-Supported Lewis Acid Copper(II) Complexes of Bis(oxazolines). Adv Synth Catal 2008. [DOI: 10.1002/adsc.200700425] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Yanagisawa A, Arai T. Recent advances in chiral phosphine–silver(i) complex-catalyzed asymmetric reactions. Chem Commun (Camb) 2008:1165-72. [DOI: 10.1039/b717104h] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Synthesis and X-ray structures of new chiral Ag(I) complexes with biaryl-based N4-donor ligands. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2007.06.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Yamamoto H, Wadamoto M. Silver-Catalyzed Asymmetric Allylation: Allyltrimethoxysilane as a Remarkable Reagent. Chem Asian J 2007; 2:692-8. [PMID: 17523136 DOI: 10.1002/asia.200600413] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Recently, there have been some reports on the use of allyltrimethoxysilane for enantioselective allylation with various metal fluorides or a combination of chiral complex and fluoride anion. These reactions can be applied not only to aldehydes but also to ketones and imines. In this Focus Review we discuss the development of asymmetric allylation with allyltrimethoxysilane catalyzed by chiral silver complexes.
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Affiliation(s)
- Hisashi Yamamoto
- Department of Chemistry, The University of Chicago, 5735 S. Ellis Avenue, Chicago, IL 60637, USA.
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21
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Wong CT, Wong MW. Mechanism of Metal Chloride-Promoted Mukaiyama Aldol Reactions. J Org Chem 2007; 72:1425-30. [PMID: 17288388 DOI: 10.1021/jo062218v] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ab initio calculations (MP2/6-311+G**//B3LYP/6-31G*) were employed to investigate the mechanism of metal chloride-promoted Mukaiyama aldol reaction between trihydrosilyl enol ether and formaldehyde. The metal chlorides considered include TiCl4, BCl3, AlCl3, and GaCl3. In contrast to the concerted pathway of the uncatalyzed aldol reaction, the Lewis acid-promoted reactions favor a stepwise mechanism. Three possible stepwise pathways were located. The lowest energy pathway corresponds to a simultaneous C-C bond formation and a chlorine atom shift in the first (rate-determining) step. This process is calculated to have a low activation barrier of 12 kJ mol-1 for the TiCl4-promoted reaction. The alternative [2+2] cycloaddition and direct carbon-carbon bond formation pathways are energetically competitive. BCl3, AlCl3, and GaCl3 are predicted to be efficient catalysts for the silicon-directed aldol reaction as they strongly activate the formaldehyde electrophile. Formation of a stable pretransition state intermolecular pi-pi complex between enol silane and the activated formaldehyde (CH2=O...MCln) is a key driving force for the facile metal chloride-promoted reactions.
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Affiliation(s)
- Chiong Teck Wong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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22
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Acid–base catalyses by dimeric disilicoicosatungstates and divacant γ-Keggin-type silicodecatungstate parent: Reactivity of the polyoxometalate compounds controlled by step-by-step protonation of lacunary WO sites. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2006.05.061] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Kundu K, Doyle MP. Constructing chiral diazoacetoacetates by enantioselective catalytic Mukaiyama aldol reactions. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2005.12.030] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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24
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Slagt MQ, Zwieten DAV, Moerkerk AJ, Gebbink RJK, Koten GV. NCN–pincer palladium complexes with multiple anchoring points for functional groups. Coord Chem Rev 2004. [DOI: 10.1016/j.ccr.2004.08.014] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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25
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Lu XL, Leong WK, Andy Hor T, Goh LY. Coordination polymers and supramolecular structures in Ag(I)triflate–dppf systems (dppf=1,1′-bis(diphenylphosphino)ferrocene). J Organomet Chem 2004. [DOI: 10.1016/j.jorganchem.2004.02.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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26
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Momiyama N, Yamamoto H. Enantioselective O- and N-Nitroso Aldol Synthesis of Tin Enolates. Isolation of Three BINAP−Silver Complexes and Their Role in Regio- and Enantioselectivity. J Am Chem Soc 2004; 126:5360-1. [PMID: 15113198 DOI: 10.1021/ja039103i] [Citation(s) in RCA: 159] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The selective generation of three different silver-BINAP catalysts has been achieved via the proper combination of metal/ligand ratio and/or choice of silver salt. Indeed, the X-ray crystallographic study has been used to gain insight into the structure of the catalyst. After the evaluation of each species, 1:1 (AgX.(R)-BINAP) complex was found to be the real active species in the O-selective nitroso aldol reaction. On the other hand, a systematic survey of solvent has shown that the optimal 2:1 (AgX.(R)-BINAP) complex is the effective catalyst in the N-selective pathway. Thus, a new method of generation of the silver-BINAP catalyst and the synthetic transformations provide not only new insights into the developing area of catalytic enantioselective nitroso aldol synthesis but also clear guidance for the design of an effective catalyst.
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Affiliation(s)
- Norie Momiyama
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, USA
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27
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Synthesis and spectroscopic characterization (IR, 1H and 31P NMR, electrospray ionization mass) of mono-, di-, tetra- and poly-meric complexes of silver(I) with diphosphine ligands: X-ray crystal structures of AgNO2:(Ph2PCH2PPh2) (1:1)2, AgNO2:(Ph2P(CH2)3PPh2) (1:1)2, AgNO2:(Ph2PCHCHPPh2) (2:1)2 and AgNO2:{p-tolyl)2P(C10H6)2P(p-tolyl)2} (1:1). Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2003.11.010] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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28
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Wadamoto M, Ozasa N, Yanagisawa A, Yamamoto H. BINAP/AgOTf/KF/18-crown-6 as new bifunctional catalysts for asymmetric Sakurai-Hosomi allylation and Mukaiyama aldol reaction. J Org Chem 2003; 68:5593-601. [PMID: 12839451 DOI: 10.1021/jo020691c] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A catalytic amount of KF.18-crown-6 complex is effective as a soluble fluoride source to activate an asymmetric Sakurai-Hosomi allylation with BINAP and silver(I) triflate catalyst. The allylation of a variety of aromatic, alpha,beta-unsaturated and aliphatic aldehydes with allylic trimethoxysilane resulted in high yields and remarkable enantioselectivities. In addition, the asymmetric Mukaiyama-type aldol reaction is achieved by using trimethoxysilyl enol ethers in the presence of the same catalysts. High anti selectivity is obtained from E-silyl enol ether, while Z-silyl enol ether gives syn selectivity.
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Affiliation(s)
- Manabu Wadamoto
- Graduate School of Engineering, Nagoya University, SORST, Japan Science and Technology Corporation (JST), Chikusa, Nagoya 464-8603, Japan
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29
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Yanagisawa A, Matsumoto Y, Asakawa K, Yamamoto H. Asymmetric aldol reaction of enol trichloroacetate catalyzed by tin methoxide and BINAP·silver(I) complex. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00984-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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