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Fox F, Neudörfl JM, Goldfuss B. Silanediol versus chlorosilanol: hydrolyses and hydrogen-bonding catalyses with fenchole-based silanes. Beilstein J Org Chem 2019; 15:167-186. [PMID: 30745992 PMCID: PMC6350884 DOI: 10.3762/bjoc.15.17] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 12/22/2018] [Indexed: 01/01/2023] Open
Abstract
Biphenyl-2,2'-bisfenchyloxydichlorosilane (7, BIFOXSiCl2) is synthesized and employed as precursor for the new silanols biphenyl-2,2'-bisfenchyloxychlorosilanol (8, BIFOXSiCl(OH)) and biphenyl-2,2'-bisfenchyloxysilanediol (9, BIFOXSi(OH)2). BIFOXSiCl2 (7) shows a remarkable stability against hydrolysis, yielding silanediol 9 under enforced conditions. A kinetic study for the hydrolysis of dichlorosilane 7 shows a 263 times slower reaction compared to reference bis-(2,4,6-tri-tert-butylphenoxy)dichlorosilane (14), known for its low hydrolytic reactivity. Computational analyses explain the slow hydrolyses of BIFOXSiCl2 (7) to BIFOXSiCl(OH) (8, E a = 32.6 kcal mol-1) and BIFOXSiCl(OH) (8) to BIFOXSi(OH)2 (9, E a = 31.4 kcal mol-1) with high activation barriers, enforced by endo fenchone units. Crystal structure analyses of silanediol 9 with acetone show shorter hydrogen bonds between the Si-OH groups and the oxygen of the bound acetone (OH···O 1.88(3)-2.05(2) Å) than with chlorosilanol 8 (OH···2.16(0) Å). Due to its two hydroxy units, the silanediol 9 shows higher catalytic activity as hydrogen bond donor than chlorosilanol 8, e.g., C-C coupling N-acyl Mannich reaction of silyl ketene acetals 11 with N-acylisoquinolinium ions (up to 85% yield and 12% ee), reaction of 1-chloroisochroman (18) and silyl ketene acetals 11 (up to 85% yield and 5% ee), reaction of chromen-4-one (20) and silyl ketene acetals 11 (up to 98% yield and 4% ee).
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Affiliation(s)
- Falco Fox
- Department für Chemie, Institut für Organische Chemie, Greinstrasse 4, 50939 Köln, Germany
| | - Jörg M Neudörfl
- Department für Chemie, Institut für Organische Chemie, Greinstrasse 6, 50939 Köln, Germany
| | - Bernd Goldfuss
- Department für Chemie, Institut für Organische Chemie, Greinstrasse 4, 50939 Köln, Germany
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Brüllingen E, Neudörfl JM, Goldfuss B. Enantioselective Cu-catalyzed 1,4-additions of organozinc and Grignard reagents to enones: exceptional performance of the hydrido-phosphite-ligand BIFOP-H. NEW J CHEM 2019. [DOI: 10.1039/c8nj05886e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Enantioselective CuI-catalyzed 1,4-additions and DFT computations concerning the enantioselective mechanism.
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Affiliation(s)
- Eric Brüllingen
- Department of Chemistry
- University of Cologne
- Organic Chemistry
- 50939 Cologne
- Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry
- University of Cologne
- Organic Chemistry
- 50939 Cologne
- Germany
| | - Bernd Goldfuss
- Department of Chemistry
- University of Cologne
- Organic Chemistry
- 50939 Cologne
- Germany
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Blanco Trillo R, Neudörfl JM, Goldfuss B. An unusually stable chlorophosphite: What makes BIFOP-Cl so robust against hydrolysis? Beilstein J Org Chem 2015; 11:313-22. [PMID: 25815085 PMCID: PMC4361969 DOI: 10.3762/bjoc.11.36] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Accepted: 02/11/2015] [Indexed: 11/23/2022] Open
Abstract
Two chlorophosphites, the biphenyl-based BIFOP-Cl and the diphenyl ether-based O-BIFOP-Cl, exhibit striking differences regarding their reaction with water. While BIFOP-Cl is nearly completely unreactive, its oxo-derivative O-BIFOP-Cl reacts instantly with water, yielding a tricyclic hydrocarbon unit after rearrangement. The analysis of the crystal structure of O-BIFOP-Cl and BIFOP-Cl revealed that the large steric demand of encapsulating fenchane units renders the phosphorus atom nearly inaccessible by nucleophilic reagents, but only for BIFOP-Cl. In addition to the steric effect, a hypervalent P(III)-O interaction as well as an electronic conjugation effect causes the high reactivity of O-BIFOP-Cl. A DFT study of the hydrolysis in BIFOP-Cl verifies a higher repulsive interaction to water and a decreased leaving tendency of the chloride nucleofuge, which is caused by the fenchane units. This high stability of BIFOP-Cl against nucleophiles supports its application as a chiral ligand, for example, in Pd catalysts.
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Affiliation(s)
- Roberto Blanco Trillo
- Department for Chemistry, Institut für Organische Chemie, Universität zu Köln, Greinstr. 4, 50939 Köln, Germany
| | - Jörg M Neudörfl
- Department for Chemistry, Institut für Organische Chemie, Universität zu Köln, Greinstr. 4, 50939 Köln, Germany
| | - Bernd Goldfuss
- Department for Chemistry, Institut für Organische Chemie, Universität zu Köln, Greinstr. 4, 50939 Köln, Germany
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Trillo RB, Leven M, Neudörfl JM, Goldfuss B. Electronegativity Governs Enantioselectivity: Alkyl-Aryl Cross-Coupling with Fenchol-Based Palladium-Phosphorus Halide Catalysts. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100924] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Lal S, McNally J, White AJP, Dı́ez-González S. Novel Phosphinite and Phosphonite Copper(I) Complexes: Efficient Catalysts for Click Azide–Alkyne Cycloaddition Reactions. Organometallics 2011. [DOI: 10.1021/om200791u] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Steven Lal
- Department of Chemistry, Imperial College London, Exhibition
Road, South Kensington, London SW7 2AZ, U.K
| | - Jayne McNally
- Department of Chemistry, Imperial College London, Exhibition
Road, South Kensington, London SW7 2AZ, U.K
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, Exhibition
Road, South Kensington, London SW7 2AZ, U.K
| | - Silvia Dı́ez-González
- Department of Chemistry, Imperial College London, Exhibition
Road, South Kensington, London SW7 2AZ, U.K
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Gliga A, Goldfuss B, Neudörfl JM. Lithium phosphonate umpolung catalysts: Do fluoro substituents increase the catalytic activity? Beilstein J Org Chem 2011; 7:1189-97. [PMID: 21977202 PMCID: PMC3182427 DOI: 10.3762/bjoc.7.138] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2011] [Accepted: 08/17/2011] [Indexed: 11/23/2022] Open
Abstract
Fluorinated and nonfluorinated phosphonates are employed as precatalysts in lithium phosphonate catalyzed cross benzoin couplings. Surprisingly, a decreased catalytic activity for the fluorinated precatalysts compared to the nonfluorinated systems is observed. Furthermore, the ring size of six, seven and nine membered ring catalysts appears not to be crucial for their catalytic activity.
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Affiliation(s)
- Anca Gliga
- Department für Chemie, Universität zu Köln, Greinstr. 4, D-50939 Köln, Germany
| | - Bernd Goldfuss
- Department für Chemie, Universität zu Köln, Greinstr. 4, D-50939 Köln, Germany
| | - Jörg M Neudörfl
- Department für Chemie, Universität zu Köln, Greinstr. 4, D-50939 Köln, Germany
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7
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Derivatizing agents from phosphorus trichloride and terpenyl tartrates for determining the enantiomeric purity of alcohols. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.04.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Hobuß D, Baro A, Axenov KV, Laschat S, Frey W. P‐Stereogenic Pinene‐Derived Phosphoramidites and Their Use in Copper‐Catalyzed Conjugate Additions. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201000946] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Dennis Hobuß
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany, Fax: +49‐711‐685‐64285
| | - Angelika Baro
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany, Fax: +49‐711‐685‐64285
| | - Kirill V. Axenov
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany, Fax: +49‐711‐685‐64285
| | - Sabine Laschat
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany, Fax: +49‐711‐685‐64285
| | - Wolfgang Frey
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany, Fax: +49‐711‐685‐64285
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Gliga A, Klare H, Schumacher M, Soki F, Neudörfl JM, Goldfuss B. New Umpolung Catalysts: Reactivity and Selectivity of Terpenol-Based Lithium Phosphonates in Enantioselective Benzoin-Type Couplings. European J Org Chem 2010. [DOI: 10.1002/ejoc.201001295] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Alpagut Y, Goldfuss B, Neudörfl JM. Control of asymmetric biaryl conformations with terpenol moieties: syntheses, structures and energetics of new enantiopure C2-symmetric diols. Beilstein J Org Chem 2008; 4:25. [PMID: 18941496 PMCID: PMC2511025 DOI: 10.3762/bjoc.4.25] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2008] [Accepted: 07/01/2008] [Indexed: 11/23/2022] Open
Abstract
New enantiopure, C(2)-symmetric biphenyl-2,2'-diols based on (-)-menthone (BIMOL), (-)-verbenone (BIVOL) and (-)-carvone (BICOL and hydrogenated BIMEOL), are accessible via short, synthetic routes. All diols form intramolecular hydrogen bonds and hence can be employed as chelating ligands for catalyst design, as it demonstrated for the (-)-fenchone based BIFOL. The sense of asymmetry of the biphenyl axes is controlled by the chiral terpene units and is conformationally surprisingly stable. X-ray analyses reveal M biphenyl conformation for BIMOL and P biphenyl conformation for each of BIVOL, BICOL and BIMEOL. The origins of the conformational biphenyl preferences are confirmed by computational ONIOM evaluations of the diols and their diastereomeric conformers. The experimentally observed biphenyl conformations are all energetically preferred, i.e. with 1.3 kcal/mol for (M)-BIMOL, with 5.1 kcal/mol for (P)-BIVOL, with 5.8 kcal/mol for (P)-BICOL, and with 5.4 kcal/mol for (P)-BIMEOL.
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Affiliation(s)
- Y Alpagut
- Institut für Organische Chemie, Universität zu Köln, Greinstrasse 4, D-50939 Köln, Germany. Fax: +49(0)221-470-5057, http://www.uni-koeln.de/goldfuss
| | - B Goldfuss
- Institut für Organische Chemie, Universität zu Köln, Greinstrasse 4, D-50939 Köln, Germany. Fax: +49(0)221-470-5057, http://www.uni-koeln.de/goldfuss
| | - J-M Neudörfl
- Institut für Organische Chemie, Universität zu Köln, Greinstrasse 4, D-50939 Köln, Germany. Fax: +49(0)221-470-5057, http://www.uni-koeln.de/goldfuss
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Betz R, Klüfers P. Hydrido-bis( meso-oxolanylen-3,4-dioxy)-λ 5-phosphane. PHOSPHORUS SULFUR 2008. [DOI: 10.1080/10426500701696829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Richard Betz
- a Department of Chemistry and Biochemistry , Ludwig Maximilians University , Munich , Germany
| | - Peter Klüfers
- a Department of Chemistry and Biochemistry , Ludwig Maximilians University , Munich , Germany
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12
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Soki F, Neudörfl JM, Goldfuss B. Homo- vs. heterometallic organoaluminum fencholates: Structures and selectivities. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2008.03.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Lange D, Neudörfl JM, Goldfuss B. New chiral lithium aluminum hydrides based on biphenyl-2,2′-bisfenchol (BIFOL): structural analyses and enantioselective reductions of aryl alkyl ketones. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.01.060] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Goldfuss B, Löschmann T, Kop-Weiershausen T, Neudörfl J, Rominger F. A superior P-H phosphonite: asymmetric allylic substitutions with fenchol-based palladium catalysts. Beilstein J Org Chem 2006; 2:7. [PMID: 16573833 PMCID: PMC1479457 DOI: 10.1186/1860-5397-2-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2006] [Accepted: 03/30/2006] [Indexed: 11/10/2022] Open
Abstract
The fenchol-based P-H phosphonite BIFOP-H exeeds with 65% ee other monodentate ligands in the Pd-catalyzed substitution of 1-phenyl-2-propenyl acetate with dimethylmalonate.
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Affiliation(s)
- Bernd Goldfuss
- Institut für Organische Chemie, Universität zu Köln, Greinstraße 4, D-50939 Köln, Germany
| | - Thomas Löschmann
- Dottikon Exclusive Synthesis, Hembrunnstrasse 17, CH-5605 Dottikon, Switzerland
| | - Tina Kop-Weiershausen
- Institut für Organische Chemie, Universität zu Köln, Greinstraße 4, D-50939 Köln, Germany
| | - Jörg Neudörfl
- Institut für Organische Chemie, Universität zu Köln, Greinstraße 4, D-50939 Köln, Germany
- X-ray analyses
| | - Frank Rominger
- X-ray analyses
- Organisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
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