1
|
Saleh N, Besnard C, Lacour J. Concave P-Stereogenic Phosphorodiamidite Ligands for Enantioselective Rh(I) Catalysis. Org Lett 2024; 26:2202-2206. [PMID: 38471122 DOI: 10.1021/acs.orglett.4c00371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
The development of a new class of concave P-stereogenic phosphorodiamidite ligands, derived from Tröger's bases (TBs), is explored. These ligands, characterized by their remarkable stability and unique structural geometry around the P atom, are used in asymmetric Rh(I)-catalyzed additions of boronic acids to NH-isatins resulting in excellent reactivities and reasonable enantioselectivity (er up to 92:8).
Collapse
Affiliation(s)
- Nidal Saleh
- Department of Organic Chemistry, University of Geneva, 1211 Geneva 4, Switzerland
| | - Céline Besnard
- Laboratory of Crystallography, University of Geneva, 1211 Geneva 4, Switzerland
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva, 1211 Geneva 4, Switzerland
| |
Collapse
|
2
|
Trupp L, Bruttomesso AC, Eliseeva SV, Petoud S, Ramírez JA, Barja BC. A Six-Armed Phenhomazine Ligand with a Potential "Turn-Off" Copper(II) Sensing Capability through Terbium(III) Luminescence Quenching. Chemistry 2020; 26:12645-12653. [PMID: 32501589 DOI: 10.1002/chem.202002282] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Indexed: 01/22/2023]
Abstract
Herein, the design, synthesis, and characterization of a phenhomazine ligand are described. The ligand has six pendant acetate arms designed for the combined coordination of copper(II) and lanthanide(III) ions, with the perspective of developing a "turn-off" copper sensor. The key step for the ligand preparation was the one-step endomethylene bridge fission of a diamino Tröger's base with a concomitant alkylation. Fluorescence and absorption spectroscopies as well as nuclear magnetic resonance (NMR) experiments were performed to analyze and understand the coordination properties of the ligand. Transition metal coordination was driven by the synergistic effect of the free nitrogen atoms of the diazocinic core and the two central acetate arms attached to those nitrogen atoms, whereas lanthanide coordination is performed by the external acetate arms, presumably forming a self-assembled 2:2 metallosupramolecular structure. The terbium complex shows the typical green emission with narrow bands and long luminescence lifetimes. The luminescence quenching produced by the presence of copper(II) ions was analyzed. This work sets, therefore, a starting point for the development of a phenhomazine-based "turn-off" copper(II) sensor.
Collapse
Affiliation(s)
- Leandro Trupp
- Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de, Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Instituto de Química Física de los Materiales, Medio Ambiente y, Energía (INQUIMAE), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Departamento de Química Orgánica, Facultad de, Ciencias Exactas y Naturales, Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Unidad de Microanálisis y Métodos Físicos Aplicados a Química Orgánica, (UMYMFOR), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Centre de Biophysique Moléculaire, Centre National de la, Recherche Scientifique (CNRS), UPR 4301, 45071, Orléans Cedex 2, France
| | - Andrea C Bruttomesso
- Departamento de Química Orgánica, Facultad de, Ciencias Exactas y Naturales, Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Unidad de Microanálisis y Métodos Físicos Aplicados a Química Orgánica, (UMYMFOR), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina
| | - Svetlana V Eliseeva
- Centre de Biophysique Moléculaire, Centre National de la, Recherche Scientifique (CNRS), UPR 4301, 45071, Orléans Cedex 2, France
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire, Centre National de la, Recherche Scientifique (CNRS), UPR 4301, 45071, Orléans Cedex 2, France
| | - Javier A Ramírez
- Departamento de Química Orgánica, Facultad de, Ciencias Exactas y Naturales, Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Unidad de Microanálisis y Métodos Físicos Aplicados a Química Orgánica, (UMYMFOR), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina
| | - Beatriz C Barja
- Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de, Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina.,Instituto de Química Física de los Materiales, Medio Ambiente y, Energía (INQUIMAE), CONICET-Universidad de Buenos Aires, Int. Güiraldes 2160, Ciudad Universitaria, Buenos Aires, 1428, Argentina
| |
Collapse
|
3
|
Bosmani A, Guarnieri‐Ibáñez A, Lacour J. Configurational Lability of Imino‐SubstitutedEthano TrögerBases. Insight on the Racemization Mechanism. Helv Chim Acta 2019. [DOI: 10.1002/hlca.201900021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Alessandro Bosmani
- Département de Chimie OrganiqueUniversité de Genève Quai Ernest Ansermet 30 CH-1211 Geneva 4 Switzerland
| | - Alejandro Guarnieri‐Ibáñez
- Département de Chimie OrganiqueUniversité de Genève Quai Ernest Ansermet 30 CH-1211 Geneva 4 Switzerland
| | - Jérôme Lacour
- Département de Chimie OrganiqueUniversité de Genève Quai Ernest Ansermet 30 CH-1211 Geneva 4 Switzerland
| |
Collapse
|
4
|
Wong YF, Kulsing C, Marriott PJ. Switchable Enantioselective Three- and Four-Dimensional Dynamic Gas Chromatography–Mass Spectrometry: Example Study of On-Column Molecular Interconversion. Anal Chem 2017; 89:5620-5628. [DOI: 10.1021/acs.analchem.7b00853] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yong Foo Wong
- Australian Centre for Research
on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Chadin Kulsing
- Australian Centre for Research
on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Philip J. Marriott
- Australian Centre for Research
on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| |
Collapse
|
5
|
Pujari SA, Besnard C, Bürgi T, Lacour J. A Mild and Efficient CH2-Extrusion Reaction for the Enantiospecific Synthesis of Highly Configurationally Stable Tröger Bases. Angew Chem Int Ed Engl 2015; 54:7520-3. [DOI: 10.1002/anie.201500435] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 03/11/2015] [Indexed: 01/16/2023]
|
6
|
Pujari SA, Besnard C, Bürgi T, Lacour J. A Mild and Efficient CH2-Extrusion Reaction for the Enantiospecific Synthesis of Highly Configurationally Stable Tröger Bases. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201500435] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
7
|
Lauber A, Zelenay B, Cvengroš J. Asymmetric synthesis of N-stereogenic molecules: diastereoselective double aza-Michael reaction. Chem Commun (Camb) 2014; 50:1195-7. [PMID: 24326342 DOI: 10.1039/c3cc48486f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel approach towards the asymmetric synthesis of N-stereogenic molecules via double aza-Michael addition was developed. The diastereomeric ratio can be increased by a thermodynamically controlled isomerization mechanism. Simple separation and functionalization of the products afford N-stereogenic compounds in high enantiomeric purity.
Collapse
Affiliation(s)
- Alex Lauber
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH Zurich, 8093 Zurich, Switzerland.
| | | | | |
Collapse
|
8
|
Sathyanarayana A, Prabusankar G. Facile access to imidazole and imidazolium substituted dibenzo-diazocines. NEW J CHEM 2014. [DOI: 10.1039/c4nj00351a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The C2-symmetrical 2,8- and 4,10-diimidazo methano dibenzo diazocines were synthesized and converted into alkyl imidazolium salts.
Collapse
Affiliation(s)
| | - Ganesan Prabusankar
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Yeddumailaram, India
| |
Collapse
|
9
|
Řezanka P, Sýkora D, Novotný M, Havlík M, Král V. Nonaqueous Capillary Electrophoretic Enantioseparation of Water Insoluble Tröger's Base Derivatives Using β-Cyclodextrin as Chiral Selector. Chirality 2013; 25:810-3. [DOI: 10.1002/chir.22220] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 06/12/2013] [Accepted: 06/17/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Pavel Řezanka
- Institute of Chemical Technology; Department of Analytical Chemistry; Prague Czech Republic
| | - David Sýkora
- Institute of Chemical Technology; Department of Analytical Chemistry; Prague Czech Republic
| | - Michal Novotný
- Institute of Chemical Technology; Department of Analytical Chemistry; Prague Czech Republic
| | - Martin Havlík
- Institute of Chemical Technology; Department of Analytical Chemistry; Prague Czech Republic
| | - Vladimír Král
- Institute of Chemical Technology; Department of Analytical Chemistry; Prague Czech Republic
| |
Collapse
|
10
|
Pujari SA, Guénée L, Lacour J. Efficient Synthesis of Imino-methano Tröger Bases by Nitrene Insertions into C–N Bonds. Org Lett 2013; 15:3930-3. [DOI: 10.1021/ol4016892] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sandip A. Pujari
- University of Geneva, Department of Organic Chemistry, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland, and Laboratory of Crystallography, University of Geneva, quai Ernest Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Laure Guénée
- University of Geneva, Department of Organic Chemistry, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland, and Laboratory of Crystallography, University of Geneva, quai Ernest Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Jérôme Lacour
- University of Geneva, Department of Organic Chemistry, 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland, and Laboratory of Crystallography, University of Geneva, quai Ernest Ansermet 24, CH-1211 Genève 4, Switzerland
| |
Collapse
|
11
|
Řezanka P, Ryšavá H, Havlík M, Jakubek M, Sýkora D, Král V. Enantioseparation of Tröger's Base Derivatives by Capillary Electrophoresis Using Cyclodextrins as Chiral Selectors. Chirality 2013; 25:379-83. [DOI: 10.1002/chir.22148] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Accepted: 12/04/2012] [Indexed: 11/11/2022]
Affiliation(s)
- Pavel Řezanka
- Institute of Chemical Technology; Department of Analytical Chemistry; Technická 5 166 28 Prague 6 Czech Republic
| | - Helena Ryšavá
- Institute of Chemical Technology; Department of Analytical Chemistry; Technická 5 166 28 Prague 6 Czech Republic
| | - Martin Havlík
- Institute of Chemical Technology; Department of Analytical Chemistry; Technická 5 166 28 Prague 6 Czech Republic
| | - Milan Jakubek
- Institute of Chemical Technology; Department of Analytical Chemistry; Technická 5 166 28 Prague 6 Czech Republic
| | - David Sýkora
- Institute of Chemical Technology; Department of Analytical Chemistry; Technická 5 166 28 Prague 6 Czech Republic
| | - Vladimír Král
- Institute of Chemical Technology; Department of Analytical Chemistry; Technická 5 166 28 Prague 6 Czech Republic
| |
Collapse
|
12
|
Interconversion of Stereochemically Labile Enantiomers (Enantiomerization). Top Curr Chem (Cham) 2013; 341:231-69. [DOI: 10.1007/128_2013_453] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
13
|
Goto H, Sudoh M, Kawamoto K, Sugimoto H, Inoue S. Isocyanurates with Planar Chirality: Design, Optical Resolution, and Isomerization. Chirality 2012; 24:867-78. [DOI: 10.1002/chir.22093] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Accepted: 06/06/2012] [Indexed: 11/09/2022]
Affiliation(s)
- Hidetoshi Goto
- Department of Industrial Chemistry, Faculty of Engineering; Tokyo University of Science; Tokyo Japan
| | - Masanao Sudoh
- Department of Industrial Chemistry, Faculty of Engineering; Tokyo University of Science; Tokyo Japan
| | - Keiko Kawamoto
- Department of Industrial Chemistry, Faculty of Engineering; Tokyo University of Science; Tokyo Japan
| | - Hiroshi Sugimoto
- Department of Industrial Chemistry, Faculty of Engineering; Tokyo University of Science; Tokyo Japan
| | - Shohei Inoue
- Department of Industrial Chemistry, Faculty of Engineering; Tokyo University of Science; Tokyo Japan
| |
Collapse
|
14
|
Goto H, Hayakawa T, Furutachi K, Sugimoto H, Inoue S. Planar-chiral metal complexes comprised of square-planar metal and achiral tetradentate ligands: design, optical resolution, and thermodynamics. Inorg Chem 2012; 51:4134-42. [PMID: 22435891 DOI: 10.1021/ic2024742] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Planar-chiral palladium complexes {[[N,N'-[1,4-butanediylbis(oxy-7,1-naphthalenediyl)]bis(2-pyridinecarboxamidato)](2-)-κN(1),κN(1)',κN(2),κN(2)']palladium (PdL(4)) and [[2,2'-[1,4-butanediylbis[[(oxy-7,1-naphthalenediyl)imino]methyl]]dipyrrolato](2-)-κN(1),κN(1)',κN(2),κN(2)']palladium (PdL(5))} were synthesized from achiral tetradentate ligands N,N'-[1,4-butanediylbis(oxy-7,1-naphthalenediyl)]bis(2-pyridinecarboxamide) (H(2)L(4)) and N,N'-bis[(1H-pyrrol-2-yl)methylidene]-7,7'-(1,4-butanediyldioxy)bis(1-naphthalenamine) (H(2)L(5)) bearing two dissymmetric bidentate units at both ends and a Pd(II) ion, respectively. The palladium complexes were crystallized in the monoclinic space group P2(1)/n with the unit cell parameters a = 16.5464(6) Å, b = 11.3534(4) Å, c = 17.6697(7) Å, β = 115.5300(10)°, and Z = 4 for PdL(4) and a = 17.2271(8) Å, b = 10.1016(5) Å, c = 17.9361(9) Å, β = 105.6310(10)°, and Z = 4 for PdL(5). The planar-chiral structures of PdL(4) and PdL(5) were confirmed by single-crystal X-ray analyses, resulting in the fact that the crystals were racemic mixtures. The racemic mixtures were successfully resolved by using chiral high-performance liquid-chromatography techniques. Racemizations of the complexes were found to be drastically dependent on the arrangement of the charged or uncharged metal-binding N atoms of the ligands.
Collapse
Affiliation(s)
- Hidetoshi Goto
- Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, 12-1 Ichigaya-funagawara, Shinjuku, Tokyo 162-0826, Japan
| | | | | | | | | |
Collapse
|
15
|
Sharma A, Besnard C, Guénée L, Lacour J. Asymmetric synthesis of ethano-Tröger bases using CuTC-catalyzed diazo decomposition reactions. Org Biomol Chem 2012; 10:966-9. [DOI: 10.1039/c1ob06751f] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
16
|
Dolenský B, Havlík M, Král V. Oligo Tröger's bases—new molecular scaffolds. Chem Soc Rev 2012; 41:3839-58. [DOI: 10.1039/c2cs15307f] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
17
|
Révész Á, Schröder D, Rokob TA, Havlík M, Dolenský B. Identification and interconversion of diastereomeric oligo-Tröger bases probed by ion mobility mass spectrometry. Phys Chem Chem Phys 2012; 14:6987-95. [DOI: 10.1039/c2cp40585g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
18
|
One-Step Catalytic Asymmetric Synthesis of Configurationally Stable Tröger Bases. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100134] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
19
|
Sharma A, Guénée L, Naubron JV, Lacour J. One-Step Catalytic Asymmetric Synthesis of Configurationally Stable Tröger Bases. Angew Chem Int Ed Engl 2011; 50:3677-80. [DOI: 10.1002/anie.201100134] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Indexed: 11/06/2022]
|
20
|
Révész Á, Schröder D, Rokob TA, Havlík M, Dolenský B. Epimerisierung einer Bis-Tröger-Base im Flug. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201007162] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
21
|
Révész Á, Schröder D, Rokob TA, Havlík M, Dolenský B. In-Flight Epimerization of a Bis-Tröger Base. Angew Chem Int Ed Engl 2011; 50:2401-4. [DOI: 10.1002/anie.201007162] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Indexed: 11/06/2022]
|
22
|
Poli E, Merino E, Díaz U, Brunel D, Corma A. Si–C attachment points during sol–gel synthesis of organosilicas from 2,8-bis-silylated Tröger's base as building block precursor. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10426h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
23
|
Trapp O. Investigation of the stereodynamics of molecules and catalyzed reactions by CE. Electrophoresis 2010; 31:786-813. [DOI: 10.1002/elps.200900599] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
24
|
Michon C, Sharma A, Bernardinelli G, Francotte E, Lacour J. Stereoselective synthesis of configurationally stable functionalized ethano-bridged Tröger bases. Chem Commun (Camb) 2010; 46:2206-8. [PMID: 20234907 DOI: 10.1039/b925065d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New functionalized ethano-bridged Tröger bases are readily prepared using a simple alkylation/rearrangement sequence which affords configurationally stable derivatives as single stereoisomers (de > 96%).
Collapse
Affiliation(s)
- Christophe Michon
- Department of Organic Chemistry, Quai Ernest Ansermet 30, Ch-1211 Geneva 4, Switzerland
| | | | | | | | | |
Collapse
|
25
|
Prof. Volker Schurig's 70th birthday. J Chromatogr A 2010; 1217:926-7. [DOI: 10.1016/j.chroma.2009.10.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2009] [Revised: 09/02/2009] [Accepted: 10/13/2009] [Indexed: 11/18/2022]
|
26
|
Chromatographic peak deconvolution of constitutional isomers by multiple-reaction-monitoring mass spectrometry. J Chromatogr A 2010; 1217:1010-6. [DOI: 10.1016/j.chroma.2009.09.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Revised: 09/11/2009] [Accepted: 09/17/2009] [Indexed: 11/21/2022]
|
27
|
Wijeratne AB, Spencer SE, Gracia J, Armstrong DW, Schug KA. Antimony(III)-D, L-tartrates exhibit proton-assisted enantioselective binding in solution and in the gas phase. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2009; 20:2100-2105. [PMID: 19683939 DOI: 10.1016/j.jasms.2009.07.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Revised: 06/26/2009] [Accepted: 07/11/2009] [Indexed: 05/28/2023]
Abstract
The negative ion mode ESI mass spectral analysis of antimony(III)-D- and -L-tartrate ("tartar emetic"), in association with leucine enantiomeric isotopomers, revealed remarkable proton-assisted enantioselective molecular recognition phenomena. The current study infers that recognition of amino acids by antimony(III)-D,L-tartrate complexes requires that the chiral selector associate a proton to become enantioselective. The dianionic selector itself failed to show enantiomeric discrimination capacity. This observation was shown to be consistent both in solution-phase targeting full scan and gas-phase targeting collision threshold dissociation (CTD) experiments. Importantly, this disparity in enantioselective binding capacity between the dianionic and the protonated monoanionic representatives of antimony(III)-D- and -L-tartrates could only be clearly revealed by ESI-MS and tandem mass spectrometry experiments as described herein. This finding urges a more in-depth study of mechanisms associated with exhibited enantiomeric resolving capacity of antimony tartrates in HPLC and CE applications, as well as in former ESI-MS association studies.
Collapse
Affiliation(s)
- Aruna B Wijeratne
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX, USA
| | | | | | | | | |
Collapse
|
28
|
Michon C, Gonçalves-Farbos MH, Lacour J. NMR enantiodifferentiation of quaternary ammonium salts of Tröger base. Chirality 2009; 21:809-17. [DOI: 10.1002/chir.20687] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
29
|
Baytekin B, Baytekin H, Hahn U, Reckien W, Kirchner B, Schalley C. Dendrimer Disassembly in the Gas Phase: A Cascade Fragmentation Reaction of Fréchet Dendrons. Chemistry 2009; 15:7139-49. [DOI: 10.1002/chem.200900403] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
30
|
|
31
|
Dolenský B, Elguero J, Král V, Pardo C, Valík M. Current Tröger's Base Chemistry. ADVANCES IN HETEROCYCLIC CHEMISTRY 2007. [DOI: 10.1016/s0065-2725(06)93001-3] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
|
32
|
Lenev DA, Golovanov DG, Lyssenko KA, Kostyanovsky RG. Configurationally stable methylates of methano- and ethano-Tröger bases. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.07.041] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
33
|
Affiliation(s)
- Martin Valík
- a Department of Analytical Chemistry , Institute of Chemical Technology Prague , Technická 5, Praha 6, 166 28, Czech Republic
| | - Robert M. Strongin
- b Department of Chemistry , Louisiana State University , Baton Rouge, LA, 70803, USA
| | - Vladimír Král
- a Department of Analytical Chemistry , Institute of Chemical Technology Prague , Technická 5, Praha 6, 166 28, Czech Republic
| |
Collapse
|
34
|
Lenev DA, Lyssenko KA, Golovanov DG, Buss V, Kostyanovsky RG. Bis-ortho-Substitution by Methyl Groups Dramatically Increases the Racemization Barrier of Tröger Bases. Chemistry 2006; 12:6412-8. [PMID: 16729337 DOI: 10.1002/chem.200501532] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We have shown through racemization kinetics studies that the enantiomerization barriers of the bis-ortho-methyl substituted Tröger bases 2 and 3 in acidic media are raised by 30 kJ mol(-1) relative to the parent compound 1, that is 130.4(4) and 131.6(4) kJ mol(-1), respectively (105 degrees C, pH 1, ethylene glycol). The enantiomerization barrier of para-methoxy-para-nitro substituted Tröger base 4 was determined by dynamic capillary electrophoresis to 96.3(2) kJ mol(-1) (25 degrees C, pH 2.2, H(2)O), which is lower by 5 kJ mol(-1) relative to 1. The influence of deutero-substitution on the racemization rates was also studied. The influence of steric and electronic factors on the enantiomerization barrier was investigated by quantum-mechanical (DFT) calculations. It is shown that enantiomerization takes place in two steps: ring-opening and further interconversion of the monocyclic intermediate. For the interconversion to occur a transition state has to be passed which is sensitive to steric effects. Ortho-substitution by methyl groups significantly increases the energy of this state. Thus, compounds 2 and 3 are the simplest Tröger bases which are configurationally stable in acidic media.
Collapse
Affiliation(s)
- Denis A Lenev
- Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 ul. Kosygina, 119991 Moscow, Russia.
| | | | | | | | | |
Collapse
|
35
|
Wistuba D, Trapp O, Gel-Moreto N, Galensa R, Schurig V. Stereoisomeric Separation of Flavanones and Flavanone-7-O-glycosides by Capillary Electrophoresis and Determination of Interconversion Barriers. Anal Chem 2006; 78:3424-33. [PMID: 16689546 DOI: 10.1021/ac0600499] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The stereoisomeric separation of several flavanones and flavanone-7-O-glycosides has been achieved with capillary electrophoresis by adding native cyclodextrins or cyclodextrin derivatives to the background electrolyte. As an alternative method, micellar electrokinetic chromatography with sodium cholate as a chiral surfactant has been used for the epimeric separation of two flavanone-7-O-glycosides. The effect of buffer systems containing mixtures of cyclodextrin with either sodium dodecyl sulfate or sodium cholate upon the chiral recognition of flavanones and flavanone-7-O-glycosides as well as the variation of the background electrolyte (concentration of buffer and surfactant, pH value, organic modifier), and its influence on the resolution factor Rs was investigated. Temperature- and pH-dependent enantiomerization or epimerization barriers of several flavanones (naringenin, homoeriodictyol) and flavanone-7-O-glycosides (naringin, neohesperidin, prunin, narirutin) in basic media (pH values of 9-11) have been observed. Interconversion profiles featuring characteristic plateau formation of the elution pattern were observed at high pH and evaluated with the simulation software ChromWin to determine rate constants k(T) and Eyring activation parameters, DeltaG#(T), DeltaH#, and DeltaS#.
Collapse
Affiliation(s)
- Dorothee Wistuba
- Institut für Organische Chemie, Universität Tübingen, 72076 Tübingen, Germany.
| | | | | | | | | |
Collapse
|
36
|
Lenev DA, Lyssenko KA, Kostyanovsky RG. Sterically hindered fluorinated and brominated Tröger bases: synthesis and X-ray diffraction analysis. MENDELEEV COMMUNICATIONS 2006. [DOI: 10.1070/mc2006v016n03abeh002345] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
37
|
Valík M, Matějka P, Herdtweck E, Král V, Dolensky B. A New Bis-Tröger's Base: Synthesis, Spectroscopy, Crystal Structure and Isomerization. ACTA ACUST UNITED AC 2006. [DOI: 10.1135/cccc20061278] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A new bis-Tröger's base was prepared from a tetraamine precursor as a mixture of two diastereoisomers. One of the isomers has a chair-like geometry, and the other possesses a boat-like geometry, embodying molecular tweezers. A one-pot preparation of bis-TB isomers and their interconversion under acid conditions was also studied. Structures of both isomers were confirmed by single-crystal X-ray diffraction. Extensive spectroscopic data, including 1H and 13C NMR, IR and Raman spectra of the isomers, are given.
Collapse
|
38
|
Deprez NR, McNitt KA, Petersen ME, Brown RG, Lewis DE. Synthesis and fluorescence properties of naphthalimide-containing Tröger’s bases. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.01.166] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
39
|
Trapp O. Evaluation and Prediction of Stereoisomerizations in Comprehensive Two-Dimensional Chromatography. ACTA ACUST UNITED AC 2004; 44:1671-9. [PMID: 15446825 DOI: 10.1021/ci049899k] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Conformational and configurational changes such as isomerizations, epimerizations, diastereomerizations and, enantiomerizations are important for the investigation of a large variety of processes ranging from protein folding to the stereostability of drugs. Under optimized conditions, these processes lead to an elution profile characterized by a plateau formation between the two interconverting species in chromatographic separations in a certain temperature range. By temperature-dependent measurements and subsequent computer simulation of the experimental chromatograms, the forward and backward rate constants k1 and k(-1), the Gibb's energy DeltaG++, activation enthalpy DeltaH++, and entropy DeltaS++ can be obtained. Due to its high efficiency two-dimensional chromatography is able to resolve the time-dependent distribution of the two species in the second dimension, thereby yielding the precise ratio of stereoisomers. An algorithm for the simulation and evaluation of two-dimensional chromatographic experiments has been developed, based on the theoretical plate model, which allows the determination of rate constants and barriers of isomerization, epimerization, and enantiomerization processes from two-dimensional chromatographic experiments. In the present article a detailed description of the extended theoretical plate model required for the simulation, the methods available, and examples for the evaluation of complex experimental data and the prediction of the separation conditions to observe isomerization, epimerizations, and enantiomerizations in two-dimensional chromatography are given.
Collapse
Affiliation(s)
- O Trapp
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
| |
Collapse
|