51
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Khiar N, Leal MP, Navas R, Moya JF, Pérez MVG, Fernández I. P/S ligands derived from carbohydrates in Rh-catalyzed hydrosilylation of ketones. Org Biomol Chem 2012; 10:355-60. [DOI: 10.1039/c1ob06305g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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52
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Zhao QL, Wang LL. Synthesis of novel chiral bidentatephosphite ligands derived from the pyranoside backbone of monosaccharides and their application in the Cu-catalyzed conjugate addition of dialkylzinc to enones. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.11.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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53
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Benessere V, De Roma A, Del Litto R, Lega M, Ruffo F. Naplephos through the Looking-Glass: Chiral Bis(phosphanylamides) Based on β-1,2-D-Glucodiamine and Their Application in Enantioselective Allylic Substitutions. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100960] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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54
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Zhou Y, Gong Y. Asymmetric Copper(II)-Catalysed Nitroaldol (Henry) Reactions Utilizing a Chiral C1-Symmetric Dinitrogen Ligand. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100857] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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55
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New tagged naplephos ligands for asymmetric allylic substitutions under traditional and unconventional conditions. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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56
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Ohshima T, Kawabata T, Takeuchi Y, Kakinuma T, Iwasaki T, Yonezawa T, Murakami H, Nishiyama H, Mashima K. C1-Symmetric Rh/Phebox-Catalyzed Asymmetric Alkynylation of α-Ketoesters. Angew Chem Int Ed Engl 2011; 50:6296-300. [DOI: 10.1002/anie.201100252] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Indexed: 11/10/2022]
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57
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Ohshima T, Kawabata T, Takeuchi Y, Kakinuma T, Iwasaki T, Yonezawa T, Murakami H, Nishiyama H, Mashima K. C1-Symmetric Rh/Phebox-Catalyzed Asymmetric Alkynylation of α-Ketoesters. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100252] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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58
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Monney A, Venkatachalam G, Albrecht M. Synthesis and catalytic activity of histidine-based NHC ruthenium complexes. Dalton Trans 2011; 40:2716-9. [PMID: 21327245 DOI: 10.1039/c0dt01768j] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Main-chain C,N-protected histidine has been successfully alkylated at both side-chain nitrogens. The corresponding histidinium salt was metallated with ruthenium(II) by a transmetalation procedure, thus providing histidine-derived NHC ruthenium complexes. These bio-inspired complexes show appreciable activity in the catalytic transfer hydrogenation of ketones.
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Affiliation(s)
- Angèle Monney
- School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
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59
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Fernández-Pérez H, Etayo P, Panossian A, Vidal-Ferran A. Phosphine−Phosphinite and Phosphine−Phosphite Ligands: Preparation and Applications in Asymmetric Catalysis. Chem Rev 2011; 111:2119-76. [DOI: 10.1021/cr100244e] [Citation(s) in RCA: 301] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Héctor Fernández-Pérez
- Institute of Chemical Research of Catalonia (ICIQ), Avgda. Països Catalans 16, 43007 Tarragona, Spain
| | - Pablo Etayo
- Institute of Chemical Research of Catalonia (ICIQ), Avgda. Països Catalans 16, 43007 Tarragona, Spain
| | - Armen Panossian
- Institute of Chemical Research of Catalonia (ICIQ), Avgda. Països Catalans 16, 43007 Tarragona, Spain
| | - Anton Vidal-Ferran
- Institute of Chemical Research of Catalonia (ICIQ), Avgda. Països Catalans 16, 43007 Tarragona, Spain
- Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluís Companys 23, 08010 Barcelona, Spain
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60
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Synthesis of novel diphosphite ligands derived from d-mannitol and their application in Cu-catalyzed enantioselective conjugate addition of organozinc to enones. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.12.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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61
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Cadierno V, Díez J, García-Garrido SE, Gimeno J, Pizzano A. Cationic rhodium(I)–diolefin complexes containing an optically active C2-symmetric bis(sulfoximine) ligand: Synthesis and catalytic activity. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.09.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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62
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Synthesis of diphosphite ligands derived from glucopyranoside and their application in the Cu-catalyzed asymmetric 1,4-addition of organozinc to enones. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.11.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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63
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Minuth T, Boysen MMK. Bis(oxazolines) based on glycopyranosides - steric, configurational and conformational influences on stereoselectivity. Beilstein J Org Chem 2010; 6:23. [PMID: 20502606 PMCID: PMC2874406 DOI: 10.3762/bjoc.6.23] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2009] [Accepted: 02/18/2010] [Indexed: 11/23/2022] Open
Abstract
In previous studies we found that the asymmetric induction of bis(oxazolines) based on D-glucosamine strongly depended on the steric demand of the 3-O-substituents. To further probe the impact of the 3-position of the pyranose scaffold, we prepared 3-epimerised and 3-defunctionalised versions of these ligands as well as a 3-O-formyl derivative. Application of these new ligands in asymmetric cyclopropanation revealed strong steric and configurational effects of position 3 on asymmetric induction, further dramatic effects of the pyranose conformation were also observed.
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Affiliation(s)
- Tobias Minuth
- Institute of Organic Chemistry, Gottfried-Wilhelm-Leibniz University of Hannover, Schneiderberg 1B, D-30167 Hannover, Germany
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64
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65
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Gual A, Godard C, Castillón S, Claver C. Highly Efficient Rhodium Catalysts for the Asymmetric Hydroformylation of Vinyl and Allyl Ethers usingC1-Symmetrical Diphosphite Ligands. Adv Synth Catal 2010. [DOI: 10.1002/adsc.200900608] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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66
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Benessere V, Ruffo F. Naplephos: a modular library of chiral phosphines based on d-glucose for highly enantioselective asymmetric catalysis. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.01.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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67
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Clark GR, Falshaw A, Gainsford GJ, Lensink C, Slade AT, James Wright L. Ruthenium complexes of chiral diphosphinite ligands with cyclohexane or chiro -inositol backbones as catalysts for asymmetric hydrogenation reactions. J COORD CHEM 2010. [DOI: 10.1080/00958970903502744] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- George R. Clark
- a Department of Chemistry , The University of Auckland , Private Bag 92019, Auckland, New Zealand
| | - Andrew Falshaw
- b Industrial Research Limited , PO Box 31-310, Lower Hutt, New Zealand
| | | | - Cornelis Lensink
- b Industrial Research Limited , PO Box 31-310, Lower Hutt, New Zealand
| | - Angela T. Slade
- a Department of Chemistry , The University of Auckland , Private Bag 92019, Auckland, New Zealand
| | - L. James Wright
- a Department of Chemistry , The University of Auckland , Private Bag 92019, Auckland, New Zealand
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68
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Barbaro P, Santo VD, Liguori F. Emerging strategies in sustainable fine-chemical synthesis: asymmetric catalysis by metal nanoparticles. Dalton Trans 2010; 39:8391-402. [DOI: 10.1039/c002051f] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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69
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Goyard D, Telligmann SM, Goux-Henry C, Boysen MM, Framery E, Gueyrard D, Vidal S. Carbohydrate-based spiro bis(isoxazolines): synthesis and evaluation in asymmetric catalysis. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.11.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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70
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71
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Cheung HY, Yu WY, Au-Yeung TT, Zhou Z, Chan AS. Effective Chiral Ferrocenyl Phosphine-Thioether Ligands in Enantioselective Palladium-Catalyzed Allylic Alkylations. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900086] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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72
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New chiral diphosphites derived from substituted 9,10-dihydroanthracene. Applications in asymmetric catalytic processes. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.02.052] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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73
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Gottschaldt M, Schubert US. Prospects of metal complexes peripherally substituted with sugars in biomedicinal applications. Chemistry 2009; 15:1548-57. [PMID: 19130511 DOI: 10.1002/chem.200802013] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Metal complexes possess unique tunable properties, such as radioactivity, cytotoxicity or photophysical features, enabling them to act as diagnostic tracers or therapeutic agents. In applying them in biological systems, it is often necessary to enhance their solubility and biocompatibility. To achieve such goals, like the targeting of binding domains, transport systems and enzyme activities, the attachment of carbohydrate moieties appears to be suitable. Sugar-substitution in the periphery of metal complexes has therefore become a strongly growing field of research. Outlined herein is a selection of recent examples.
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Affiliation(s)
- Michael Gottschaldt
- Laboratory for Organic and Macromolecular Chemistry, Friedrich-Schiller-University Jena, Humboldtstrasse 10, 07743 Jena, Germany.
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74
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Gual A, Godard C, Claver C, Castillón S. C1-Symmetric Diphosphite Ligands Derived from Carbohydrates: Influence of Structural Modifications on the Rhodium-Catalyzed Asymmetric Hydroformylation of Styrene. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801093] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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75
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Del Litto R, Benessere V, Ruffo F, Moberg C. Carbohydrate-Based Pyridine-2-carboxamides for Mo-Catalyzed Asymmetric Allylic Alkylations. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801240] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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76
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Gual A, Godard C, Philippot K, Chaudret B, Denicourt-Nowicki A, Roucoux A, Castillón S, Claver C. Carbohydrate-derived 1,3-diphosphite ligands as chiral nanoparticle stabilizers: promising catalytic systems for asymmetric hydrogenation. CHEMSUSCHEM 2009; 2:769-779. [PMID: 19598200 DOI: 10.1002/cssc.200900079] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Metallic Ru, Rh, and Ir nanoparticles were prepared by the decomposition of organometallic precursors under H(2) pressure in the presence of 1,3-diphosphite ligands, derived from carbohydrates, as stabilizing agents. Structural modifications to the diphosphite backbone were found to influence the nanoparticles' size, dispersion, and catalytic activity. In the hydrogenation of o- and m-methylanisole, the Rh nanoparticles showed higher catalytic activity than the corresponding Ru nanoparticles. The Ir nanoparticles presented the lowest catalytic activity of the series. In all cases, the hydrogenation of o-methylanisole gave total selectivity for the cis-product, however, the ee of the product was always less than 6 %. A maximum of 81 % cis-selectivity was obtained for the hydrogenation of m-methylanisole, however, no asymmetric induction was observed. These results show that the catalytic activity is affected by a combination of influences from the substrate, the diphosphite ligands, and the metallic nanoparticles.
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Affiliation(s)
- Aitor Gual
- Department de Química Física I Inorgànica, Universitat Rovira I Virigli, Tarragona, Spain
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77
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Constable EC, Housecroft CE, Mahmood A. New chiral oligopyridines—4,4′-bis(disaccharide)-functionalised 2,2′-bipyridines and 4′-(disaccharide)-functionalised 2,2′:6′,2′′-terpyridines. Carbohydr Res 2008; 343:2567-75. [DOI: 10.1016/j.carres.2008.08.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2007] [Revised: 07/16/2008] [Accepted: 08/02/2008] [Indexed: 12/01/2022]
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78
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Muñoz S, Pons J, Solans X, Font-Bardia M, Ros J. New N-pyrazole, P-phosphinite hybrid ligands and corresponding Rh(I) complexes: X-ray crystal structures of complexes with [Rh, N, P-phosphinite, Cl, (CO)] core. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2008.03.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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79
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Kuberski B, Pecul M, Szumna A. A Chiral “Frozen” Hydrogen Bonding inC4-Symmetric Inherently Chiral Resorcin[4]arenes: NMR, X-ray, Circular Dichroism, and Theoretical Study. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800247] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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80
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Concellón J, Bernad P, del Solar V, García-Granda S, Díaz MR. Unusual Totally Selective Cyclodimerization of Epoxides: Synthesis of a Pair of Diastereoisomers of Enantiopure 2,5-Disubstituted-1,4-Dioxanes withC2 Symmetry. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200700486] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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81
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Irmak M, Boysen MM. A New Pyridyl Bis(oxazoline) Ligand Prepared fromD-Glucosamine for Asymmetric Alkynylation of Imines. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200700592] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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82
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Gual A, Axet MR, Philippot K, Chaudret B, Denicourt-Nowicki A, Roucoux A, Castillon S, Claver C. Diphosphite ligands derived from carbohydrates as stabilizers for ruthenium nanoparticles: promising catalytic systems in arene hydrogenation. Chem Commun (Camb) 2008:2759-61. [DOI: 10.1039/b802316f] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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83
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Benessere V, De Roma A, Ruffo F. Carbohydrates as building blocks of privileged ligands for multiphasic asymmetric catalysis. CHEMSUSCHEM 2008; 1:425-430. [PMID: 18702137 DOI: 10.1002/cssc.200800013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
To combine the high chemical performance of asymmetric catalysis with the increasing need for sustainability, a strategy is presented that involves the straightforward preparation of "Trost"-like ligands suitable for application in multiphasic homogeneous catalysis. Ligands with coordinating functions (phosphinoamide-phoshinoester groups) as well as phase tags introduced on a D-glucose scaffold were prepared and then examined in the Pd-catalysed asymmetric desymmetrization of meso-2-cyclopenten-1,4-diol biscarbamate. In line with our assumption, the performance of the catalyst system under traditional conditions is as high as that of the original Trost ligand, derived from trans-cyclohexanediamine, giving enantioselectivities of 98 % ee. Moreover, promising results were observed under multiphasic homogeneous conditions.
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Affiliation(s)
- Vincenzo Benessere
- Dipartimento di Chimica Paolo Corradini, Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo via Cintia, 80126 Napoli, Italy
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84
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Favier I, Gómez M, Muller G, Axet MR, Castillón S, Claver C, Jansat S, Chaudret B, Philippot K. Palladium Catalytic Species Containing Chiral Phosphites: Towards a Discrimination between Molecular and Colloidal Catalysts. Adv Synth Catal 2007. [DOI: 10.1002/adsc.200700200] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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85
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Abstract
While amino acids, terpenes and alkaloids have found broad application as tools in stereoselective organic synthesis, carbohydrates have only lately been recognised as versatile starting materials for chiral auxiliaries, reagents, ligands and organocatalysts. The structural diversity of carbohydrates and the high density of functional groups offer a wide variety of opportunities for derivatization and tailoring of synthetic tools to a specific problem.
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Affiliation(s)
- Mike M K Boysen
- Institute of Organic Chemistry, Gottfried-Wilhelm-Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany.
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86
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Tewes F, Schlecker A, Harms K, Glorius F. Carbohydrate-containing N-heterocyclic carbene complexes. J Organomet Chem 2007. [DOI: 10.1016/j.jorganchem.2007.05.007] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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87
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Axet MR, Benet-Buchholz J, Claver C, Castillón S. NewC2-Symmetric Diphosphite Ligands Derived from Carbohydrates: Effect of the Remote Stereocenters on Asymmetric Catalysis. Adv Synth Catal 2007. [DOI: 10.1002/adsc.200600654] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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88
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(R,R,R)-Tris(2-hydroxy-1-methylethyl)- and (S,S,S)-tris(2-hydroxy-2-methylethyl)phosphine: water-soluble chiral trialkylphosphines with C3-symmetry. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.06.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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89
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Del Litto R, De Roma A, Ruffo F. A convenient route from simple sugars to new chiral bis(phosphinoesters) for asymmetric catalysis. INORG CHEM COMMUN 2007. [DOI: 10.1016/j.inoche.2007.02.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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90
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Falshaw A, Gainsford GJ, Lensink C, Slade AT, Wright LJ. Ruthenium complexes that incorporate a chiro-inositol derived diphosphinite ligand as catalysts for asymmetric hydrogenation reactions. Polyhedron 2007. [DOI: 10.1016/j.poly.2006.06.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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91
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Dwivedi N, Bisht SS, Tripathi RP. Asymmetric organocatalysis with glycosyl-β-amino acids: direct asymmetric aldol reaction of acetone with aldehydes. Carbohydr Res 2006; 341:2737-43. [PMID: 16989790 DOI: 10.1016/j.carres.2006.08.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2006] [Revised: 08/08/2006] [Accepted: 08/09/2006] [Indexed: 11/24/2022]
Abstract
Direct asymmetric aldol reaction of acetone with aromatic aldehydes was achieved in good yields and high enantioselectivity using 5-amino-5-deoxy-beta-L-ido-(alpha-D-gluco)-heptofuranuronic acids as a new class of organocatalysts.
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Affiliation(s)
- Namrata Dwivedi
- Medicinal and Process Chemistry Division, Central Drug Research Institute, Lucknow 226 001, India
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92
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Hailes HC. Reaction Solvent Selection: The Potential of Water as a Solvent for Organic Transformations. Org Process Res Dev 2006. [DOI: 10.1021/op060157x] [Citation(s) in RCA: 243] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Helen C. Hailes
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
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93
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Bis(phosphinoamides) based on sugars for highly enantioselective allylic substitution: inversion of stereocontrol by switching from glucose to mannose. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.07.032] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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94
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Kato M, Sah AK, Tanase T, Mikuriya M. Tetranuclear Copper(II) Complexes Bridged by α-d-Glucose-1-Phosphate and Incorporation of Sugar Acids through the Cu4 Core Structural Changes. Inorg Chem 2006; 45:6646-60. [PMID: 16903719 DOI: 10.1021/ic060202h] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Tetranuclear copper(II) complexes containing alpha-D-glucose-1-phosphate (alpha-D-Glc-1P), [Cu4(mu-OH){mu-(alpha-D-Glc-1P)}2(bpy)4(H2O)2]X3 [X = NO3 (1a), Cl (1b), Br (1c)], and [Cu4(mu-OH){mu-(alpha-D-Glc-1P)}2(phen)4(H2O)2](NO3)3 (2) were prepared by reacting the copper(II) salt with Na2[alpha-D-Glc-1P] in the presence of diimine ancillary ligands, and the structure of 2 was characterized by X-ray crystallography to comprise four {Cu(phen)}2+ fragments connected by the two sugar phosphate dianions in 1,3-O,O' and 1,1-O mu4-bridging fashion as well as a mu-hydroxo anion. The crystal structure of 2 involves two chemically independent complex cations in which the C2 enantiomeric structure for the trapezoidal tetracopper(II) framework is switched according to the orientation of the alpha-D-glucopyranosyl moieties. Temperature-dependent magnetic susceptibility data of 1a indicated that antiferromagnetic spin coupling is operative between the two metal ions joined by the hydroxo bridge (J = -52 cm(-1)) while antiferromagnetic interaction through the Cu-O-Cu sugar phosphate bridges is weak (J = -13 cm(-1)). Complex 1a readily reacted with carboxylic acids to afford the tetranuclear copper(II) complexes, [Cu4{mu-(alpha-D-Glc-1P)}2(mu-CA)2(bpy)4](NO3)2 [CA = CH3COO (3), o-C6H4(COO)(COOH) (4)]. Reactions with m-phenylenediacetic acid [m-C6H4(CH2COOH)2] also gave the discrete tetracopper(II) cationic complex [Cu4{mu-(alpha-D-Glc-1P)}2(mu-m-C6H4(CH2COO)(CH2COOH))2(bpy)4](NO3)2 (5a) as well as the cluster polymer formulated as {[Cu4{mu-(alpha-D-Glc-1P)}2(mu-m-C6H4(CH2COO)2)(bpy)4](NO3)2}n (5b). The tetracopper structure of 1a is converted into a symmetrical rectangular core in complexes 3, 4, and 5b, where the hydroxo bridge is dissociated and, instead, two carboxylate anions bridge another pair of Cu(II) ions in a 1,1-O monodentate fashion. The similar reactions were applied to incorporate sugar acids onto the tetranuclear copper(II) centers. Reactions of 1a with delta-D-gluconolactone, D-glucuronic acid, or D-glucaric acid in dimethylformamide resulted in the formation of discrete tetracopper complexes with sugar acids, [Cu4{mu-(alpha-D-Glc-1P)}2(mu-SA)2(bpy)4](NO3)2 [SA = D-gluconate (6), D-glucuronate (7), D-glucarateH (8a)]. The structures of 6 and 7 were determined by X-ray crystallography to be almost identical with that of 3 with additional chelating coordination of the C-2 hydroxyl group of D-gluconate moieties (6) or the C-5 cyclic O atom of D-glucuronate units (7). Those with D-glucaric acid and D-lactobionic acid afforded chiral one-dimensional polymers, {[Cu4{mu-(alpha-D-Glc-1P)}2(mu-D-glucarate)(bpy)4](NO3)2}n (8b) and {[Cu4{mu-(alpha-D-Glc-1P)}2(mu-D-lactobionate)(bpy)4(H2O)2](NO3)3}n (9), respectively, in which the D-Glc-1P-bridged tetracopper(II) units are connected by sugar acid moieties through the C-1 and C-6 carboxylate O atoms in 8b and the C-1 carboxylate and C-6 alkoxy O atoms of the gluconate chain in 9. When complex 7 containing d-glucuronate moieties was heated in water, the mononuclear copper(II) complex with 2-dihydroxy malonate, [Cu(mu-O2CC(OH)2CO2)(bpy)] (10), and the dicopper(II) complex with oxalate, [Cu2(mu-C2O4)(bpy)2(H2O)2](NO3)2 (11), were obtained as a result of oxidative degradation of the carbohydrates through C-C bond cleavage reactions.
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Affiliation(s)
- Merii Kato
- Department of Chemistry, Faculty of Science, Nara Women's University, Kitauoya-higashi-machi, Nara 630-8285, Japan
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95
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Dervisi A, Koursarou D, Ooi LL, Horton PN, Hursthouse MB. Synthesis and characterisation of benzyl phosphino-thioether and -thiolato Pd(ii) complexes and their applications in Suzuki coupling reactions. Dalton Trans 2006:5717-24. [PMID: 17146536 DOI: 10.1039/b609607g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of the benzyl phosphinothioether derivatives Ph(2)PCH(2)CH(Et)SR and their corresponding palladium complexes are reported, where R = CH(2)Ph, R = CH(2)-3,5-Me-C(6)H(3) and R = 1-CH(2)C(10)H(7)(5). Crystallographic data obtained for the complexes Pd(3)Cl(2) and Pd(4)Cl(2) show intra- and inter-molecular pi-pi interactions between the aromatic rings on the P and S substituents, and NOE experiments for Pd(4)Cl(2) show that these interactions persist in solution. The performance of the phosphinothioether palladium complexes in aryl-aryl cross-coupling reactions is compared with that of the corresponding complex of the parent phosphinothiolato ligand Ph(2)PCH(2)CH(Et)S(-)(1). High turnover numbers up to 2000000 are reported for the coupling of bromobenzene, using the palladium dimer [Pd(1)I](2) as the catalyst precursor. Kinetic studies show a linear dependence of the reaction on catalyst loading. The effect of other variables on the cross-coupling reaction, such as temperature, solvent and base, is also reported.
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Affiliation(s)
- Athanasia Dervisi
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, UKCF10 3AT.
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96
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Fey N, Howell JAS, Lovatt JD, Yates PC, Cunningham D, McArdle P, Gottlieb HE, Coles SJ. A molecular mechanics approach to mapping the conformational space of diaryl and triarylphosphines. Dalton Trans 2006:5464-75. [PMID: 17117216 DOI: 10.1039/b610123b] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A molecular mechanics force field has been developed which accurately reproduces experimental solid state structures and conformer interconversion barriers for a series of sterically congested diaryl and triaryl phosphines and some of their chalcogenide and Cr(CO)5 derivatives.
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Affiliation(s)
- Natalie Fey
- School of Chemistry, Cantock's Close, Clifton, Bristol, UKBS8 1TS.
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