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Wenzel TJ, Chisholm CD. Using NMR spectroscopic methods to determine enantiomeric purity and assign absolute stereochemistry. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2011; 59:1-63. [PMID: 21600355 DOI: 10.1016/j.pnmrs.2010.07.003] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 07/28/2010] [Indexed: 05/30/2023]
Affiliation(s)
- Thomas J Wenzel
- Department of Chemistry, Bates College, Lewiston, Maine 04240, USA.
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52
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Pérez-Fuertes Y, Taylor JE, Tickell DA, Mahon MF, Bull SD, James TD. Asymmetric Strecker synthesis of α-arylglycines. J Org Chem 2011; 76:6038-47. [PMID: 21627154 DOI: 10.1021/jo200528s] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A practically simple three-component Strecker reaction for the asymmetric synthesis of enantiopure α-arylglycines has been developed. Addition of a range of aryl-aldehydes to a solution of sodium cyanide and (S)-1-(4-methoxyphenyl)ethylamine affords highly crystalline (S,S)-α-aminonitriles that are easily obtained in diastereomerically pure form. Heating the resultant (S,S)-α-aminonitriles in 6 M aqueous HCl at reflux resulted in cleavage of their chiral auxiliary fragments and concomitant hydrolysis of their nitrile groups to afford enantiopure (S)-α-arylglycines. The enantiopurities of these (S)-α-arylglycines were determined via derivatization of their corresponding methyl esters with 2-formylphenylboronic acid and (S)-BINOL, followed by (1)H NMR spectroscopic analysis of the resultant mixtures of diastereomeric iminoboronate esters.
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Nishiyabu R, Kubo Y, James TD, Fossey JS. Boronic acid building blocks: tools for sensing and separation. Chem Commun (Camb) 2011; 47:1106-23. [DOI: 10.1039/c0cc02920c] [Citation(s) in RCA: 313] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Nishiyabu R, Kubo Y, James TD, Fossey JS. Boronic acid building blocks: tools for self assembly. Chem Commun (Camb) 2011; 47:1124-50. [DOI: 10.1039/c0cc02921a] [Citation(s) in RCA: 411] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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55
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Martić S, Labib M, Shipman PO, Kraatz HB. Ferrocene-peptido conjugates: From synthesis to sensory applications. Dalton Trans 2011; 40:7264-90. [DOI: 10.1039/c0dt01707h] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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56
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Mirri G, Bull SD, Horton PN, James TD, Male L, Tucker JHR. Electrochemical method for the determination of enantiomeric excess of binol using redox-active boronic acids as chiral sensors. J Am Chem Soc 2010; 132:8903-5. [PMID: 20536177 DOI: 10.1021/ja103462x] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A chiral ferrocene-based boronic acid interacts with (R)- and (S)-Binol to form two complexes that exhibit significantly different ferrocene-based electrode potentials. This difference in redox behavior can be exploited to demonstrate in principle how high levels of enantiomeric excess in a mixture of enantiomers can be quantified and read-out using an electrochemical method.
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Affiliation(s)
- Giorgio Mirri
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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Sun P, Armstrong DW. Effective enantiomeric separations of racemic primary amines by the isopropyl carbamate-cyclofructan6 chiral stationary phase. J Chromatogr A 2010; 1217:4904-18. [PMID: 20561631 DOI: 10.1016/j.chroma.2010.04.079] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Revised: 04/22/2010] [Accepted: 04/29/2010] [Indexed: 11/29/2022]
Abstract
A new chiral stationary phase (CSP) was developed by bonding isopropyl-carbamate functionalized cyclofructan6 (IP-CF6) to the silica gel. It was evaluated by injecting 119 racemic primary amine-containing compounds. This CSP showed pronounced enantioselectivity toward all types of primary amines, separating 93% of all tested compounds. Baseline separation was achieved even for some simple aliphatic racemic amines that contained no other functionality. The polar organic mode was shown to be the effective mobile phase owing to higher efficiency. This new chiral stationary phase showed great potential for preparative-scale separations. It is also interesting that the chiral selector, R-naphthylethyl-carbamate functionalized CF6 (RN-CF6), was found to provide complementary selectivity for the relatively few amine analytes that did not separate on IP-CF6. Thus between the two CSPs, 98% of attempted amine compounds were separated.
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Affiliation(s)
- Ping Sun
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019-0065, USA
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58
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Elfeky S, Flower S, Masumoto N, D'Hooge F, Labarthe L, Chen W, Len C, James T, Fossey J. Diol Appended Quenchers for Fluorescein Boronic Acid. Chem Asian J 2010; 5:581-8. [DOI: 10.1002/asia.200900386] [Citation(s) in RCA: 25] [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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59
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Nieto S, Dragna JM, Anslyn EV. A facile circular dichroism protocol for rapid determination of enantiomeric excess and concentration of chiral primary amines. Chemistry 2010; 16:227-32. [PMID: 19946914 PMCID: PMC2982703 DOI: 10.1002/chem.200902650] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A protocol for the rapid determination of the absolute configuration and enantiomeric excess (ee) of alpha-chiral primary amines with potential applications in asymmetric reaction discovery has been developed. The protocol requires derivatization of alpha-chiral primary amines through condensation with pyridine carboxaldehyde to quantitatively yield the corresponding imine. The Cu(I) complex with 2,2'-bis (diphenylphosphino)-1,1'-dinaphthyl (BINAP--Cu(I)) with the imine yields a metal-to-ligand charge-transfer (MLCT) band in the visible region of the circular dichroism (CD) spectrum upon binding. Diastereomeric host-guest complexes give CD signals of the same signs but different amplitudes, allowing for differentiation of enantiomers. Processing the primary optical data from the CD spectrum with linear discriminant analysis (LDA) allows for the determination of the absolute configuration and identification of the amines, and processing with a supervised multilayer perceptron artificial neural network (MLP-ANN) allows for the simultaneous determination of the ee and concentration. The primary optical data necessary to determine the ee of unknown samples is obtained in two minutes per sample. To demonstrate the utility of the protocol in asymmetric reaction discovery, the ee values and concentrations for an asymmetric metal-catalyzed reaction are determined. The potential of the application of this protocol in high-throughput screening (HTS) of ee is discussed.
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Affiliation(s)
- Sonia Nieto
- Department of Chemistry and Biochemistry, University of Texas at
Austin, Austin, TX 78712
| | - Justin M. Dragna
- Department of Chemistry and Biochemistry, University of Texas at
Austin, Austin, TX 78712
| | - Eric V. Anslyn
- Department of Chemistry and Biochemistry, University of Texas at
Austin, Austin, TX 78712
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60
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Orlov NV, Ananikov VP. First principles design of derivatizing agent for direct determination of enantiomeric purity of chiral alcohols and amines by NMR spectroscopy. Chem Commun (Camb) 2010; 46:3212-4. [DOI: 10.1039/b923359h] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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61
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Nieto S, Arnau P, Serrano E, Navarro R, Soler T, Cativiela C, Urriolabeitia EP. Functionalization of Methyl (R)-Phenylglycinate Through Orthopalladation: C−Hal, C−O, C−N, and C−C Bond Coupling. Inorg Chem 2009; 48:11963-75. [DOI: 10.1021/ic901941s] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sonia Nieto
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Palmira Arnau
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Elena Serrano
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Rafael Navarro
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Tatiana Soler
- Servicios Técnicos de Investigación, Facultad de Ciencias Fase II, Universidad de Alicante, 03690 San Vicente de Raspeig, Alicante, Spain
| | - Carlos Cativiela
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Esteban P. Urriolabeitia
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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Baldwin JE, Kiemle DJ, Kostikov AP. Quantitative Analyses of Mixtures of 2-Deuterio-1-vinylcyclobutanes. J Org Chem 2009; 74:7866-72. [DOI: 10.1021/jo901663v] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John E. Baldwin
- Department of Chemistry, Syracuse University, Syracuse, New York 13244
| | - David J. Kiemle
- Department of Chemistry, State University of New York College of Environmental Science and Forestry, Syracuse, New York 13210
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A simple chiral derivatisation protocol for 1H NMR spectroscopic analysis of the enantiopurity of O-silyl-1,2-amino alcohols. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2008.12.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Galbraith E, Kelly AM, Fossey JS, Kociok-Köhn G, Davidson MG, Bull SD, James TD. Dynamic covalent self-assembled macrocycles prepared from 2-formyl-aryl-boronic acids and 1,2-amino alcohols. NEW J CHEM 2009. [DOI: 10.1039/b815138e] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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66
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Elfeky SA, D’Hooge F, Poncel L, Chen W, Perera SP, van den Elsen JMH, James TD, Jenkins ATA, Cameron PJ, Fossey JS. A surface plasmon enhanced fluorescence sensor platform. NEW J CHEM 2009. [DOI: 10.1039/b906125h] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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67
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Ma WMJ, Pereira Morais MP, D’Hooge F, van den Elsen JMH, Cox JPL, James TD, Fossey JS. Dye displacement assay for saccharide detection with boronate hydrogels. Chem Commun (Camb) 2009:532-4. [DOI: 10.1039/b814379j] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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68
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Yeste SL, Powell ME, Bull SD, James TD. Simple Chiral Derivatization Protocols for 1H NMR and 19F NMR Spectroscopic Analysis of the Enantiopurity of Chiral Diols. J Org Chem 2008; 74:427-30. [DOI: 10.1021/jo8019187] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sonia Lozano Yeste
- Department of Chemistry, University of Bath, Bath, BA2 7AY, United Kingdom
| | | | - Steven D. Bull
- Department of Chemistry, University of Bath, Bath, BA2 7AY, United Kingdom
| | - Tony D. James
- Department of Chemistry, University of Bath, Bath, BA2 7AY, United Kingdom
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69
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Jackson TR, Springall JS, Rogalle D, Masumoto N, Ching Li H, D'Hooge F, Perera SP, Jenkins ATA, James TD, Fossey JS, van den Elsen JMH. Boronate affinity saccharide electrophoresis: a novel carbohydrate analysis tool. Electrophoresis 2008; 29:4185-91. [PMID: 18925583 DOI: 10.1002/elps.200800178] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The incorporation of specialised carbohydrate affinity ligand methacrylamido phenylboronic acid in polyacrylamide gels for fluorophore-assisted carbohydrate electrophoresis greatly improved the effective separation of saccharides that show similar mobilities in standard electrophoresis. Polyacrylamide gel electrophoresis using methacrylamido phenylboronic acid in low loading (typically 0.5-1% dry weight) was unequivocally shown to alter retention of labelled saccharides depending on their boronate affinity. While conventional fluorophore-assisted carbohydrate electrophoresis of 2-aminoacridone labelled glucose oligomers showed an inverted parabolic migration, an undesired trait of small oligosaccharides labelled with this neutral fluorophore, boron affinity saccharide electrophoresis separation of these carbohydrates completely restored their predicted running order, based on their charge/mass ratio, and resulted in improved separation of the analyte saccharides. These results exemplify boron affinity saccharide electrophoresis as an important new technique for analysing carbohydrates and sugar-containing molecules.
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Affiliation(s)
- Thomas R Jackson
- Department of Biology and Biochemistry, University of Bath, Bath, UK
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