1
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Kopysov V, Yamaletdinov R, Boyarkin OV. Quantification of enantiomers and blind identification of erythro-sphingosine non-racemates by cold ion spectroscopy. Analyst 2024. [PMID: 39140796 PMCID: PMC11323735 DOI: 10.1039/d4an00911h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2024] [Accepted: 08/10/2024] [Indexed: 08/15/2024]
Abstract
Enantiomers of a lipid erythro-sphingosine have been quantified with ≈4% accuracy by UV cold ion spectroscopy of their non-covalent complexes with a chiral aromatic molecule. The diastereomeric configuration of such complexes enables the quantification using just a single enantiomeric lipid standard and the identification of non-racemic solutions with no standards at all.
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Affiliation(s)
- Vladimir Kopysov
- SCI-SB-RB Group, ISIC, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
| | - Ruslan Yamaletdinov
- SCI-SB-RB Group, ISIC, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
| | - Oleg V Boyarkin
- SCI-SB-RB Group, ISIC, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
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2
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Monselise EBI, Vyazmensky M, Scherf T, Batushansky A, Fishov I. D-Glutamate production by stressed Escherichia coli gives a clue for the hypothetical induction mechanism of the ALS disease. Sci Rep 2024; 14:18247. [PMID: 39107374 PMCID: PMC11303787 DOI: 10.1038/s41598-024-68645-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Accepted: 07/25/2024] [Indexed: 08/10/2024] Open
Abstract
In the search for the origin of Amyotrophic Lateral Sclerosis disease (ALS), we hypothesized earlier (Monselise, 2019) that D-amino acids produced by stressed microbiome may serve as inducers of the disease development. Many examples of D-amino acid accumulation under various stress conditions were demonstrated in prokaryotic and eukaryotic cells. In this work, wild-type Escherichia coli, members of the digestive system, were subjected to carbon and nitrogen starvation stress. Using NMR and LC-MS techniques, we found for the first time that D-glutamate accumulated in the stressed bacteria but not in control cells. These results together with the existing knowledge, allow us to suggest a new insight into the pathway of ALS development: D-glutamate, produced by the stressed microbiome, induces neurobiochemical miscommunication setting on C1q of the complement system. Proving this insight may have great importance in preventive medicine of such MND modern-age diseases as ALS, Alzheimer, and Parkinson.
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Affiliation(s)
- Edna Ben-Izhak Monselise
- Department of Life Science, Bergman Campus, Ben-Gurion University of the Negev, 8441901, Beer-Sheva, Israel.
| | - Maria Vyazmensky
- Department of Life Science, Bergman Campus, Ben-Gurion University of the Negev, 8441901, Beer-Sheva, Israel
| | - Tali Scherf
- Department of Chemical Research Support, The Weizmann Institute of Science, 7610001, Rehovot, Israel
| | - Albert Batushansky
- Ilse Katz Institute for Nanoscale Science & Technology, Marcus Campus, Ben-Gurion University of the Negev, 8410501, Beer-Sheva, Israel
| | - Itzhak Fishov
- Department of Life Science, Bergman Campus, Ben-Gurion University of the Negev, 8441901, Beer-Sheva, Israel.
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3
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Lafrance AA, Girard M, Bryce DL. Solid-state NMR spectra of amino acid enantiomers and their relative intensities. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2024; 131:101925. [PMID: 38582022 DOI: 10.1016/j.ssnmr.2024.101925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 03/21/2024] [Accepted: 03/22/2024] [Indexed: 04/08/2024]
Abstract
Under normal experimental conditions in an achiral environment, NMR spectra of enantiomers have chemical shifts and J couplings which are not differentiable. In this work, the reproducibility of spectral intensities for pairs of amino acid enantiomers, as well as factors influencing these intensities, is assessed using 13C and 15N cross-polarization magic-angle spinning (CP/MAS) NMR spectroscopy. Prompted by a recent literature debate over a possible influence of the chirality-induced spin selectivity (CISS) effect on spectral intensities obtained in CP/MAS NMR experiments carried out on enantiomers, a number of control experiments were performed with recycle delays of at least 5T1. These included the analysis of proton-decoupled Bloch decay solid-state NMR spectra as well as solution NMR spectra where the cross polarization process is absent. Bloch decay and CP/MAS NMR spectra yield the same relative intensities for pairs of enantiomers while solution NMR spectra provide relative intensities closest to unity. Differences of plus-or-minus a few percent in the D/L spectral intensity ratios observed in all solid-state NMR experiments are due to sample preparation (i.e., grinding, particle size, partial amorphization) and limitations on sample purity. As previously described in the literature, more drastic intensity differences on the order of 50% are easily created by ball milling the samples. Finally, apodization is shown to invert the apparent D/L ratio in low signal-to-noise 15N CP/MAS NMR spectra of aspartic acid enantiomers. In summary, no spectral intensity differences attributable to enantiomerism are identified.
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Affiliation(s)
- Audrey-Anne Lafrance
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, and Nexus for Quantum Technologies, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario, K1N 6N5, Canada
| | - Manon Girard
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, and Nexus for Quantum Technologies, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario, K1N 6N5, Canada
| | - David L Bryce
- Department of Chemistry and Biomolecular Sciences, Centre for Catalysis Research and Innovation, and Nexus for Quantum Technologies, University of Ottawa, 10 Marie Curie Private, Ottawa, Ontario, K1N 6N5, Canada.
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4
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Chen S, Wu R, Fu HH. Persistent Chirality-Induced Spin-Selectivity Effect in Circular Helix Molecules. NANO LETTERS 2024; 24:6210-6217. [PMID: 38709107 DOI: 10.1021/acs.nanolett.4c00383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2024]
Abstract
The spin-orbit coupling (SOC), the dynamics of the nonequilibrium transport process, and the breaking of time-reversal and space-inversion symmetries have been regarded as key factors for the emergence of chirality-induced spin selectivity (CISS) and chirality-dependent spin currents in helix molecules. In this work, we demonstrated the generation of persistent CISS currents in various circular single-stranded DNAs and 310-helix proteins for the first time, regardless of whether an external magnetic flux is applied or not. This new CISS effect presents only in equilibrium transport processes, distinct from the traditional CISS observed in nonequilibrium transport processes and linear helix molecules; we term it as the PCISS effect. Notably, PCISS manifests irrespective of whether the SOC is chirality-driven or stems from heavy-metal substrates, making it an efficient way to generate chirality-locked pure spin currents. Our research establishes a novel paradigm for examining the underlying physics of the CISS effect.
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Affiliation(s)
- Song Chen
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Ruqian Wu
- Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, United States
| | - Hua-Hua Fu
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- Institute for Quantum Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
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5
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Sonstrom RE, Vang ZP, Scolati HN, Neill JL, Pate BH, Clark JR. Rapid Enantiomeric Excess Measurements of Enantioisotopomers by Molecular Rotational Resonance Spectroscopy. Org Process Res Dev 2023; 27:1185-1197. [PMID: 38046274 PMCID: PMC10691865 DOI: 10.1021/acs.oprd.3c00028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
Abstract
Recent work in drug discovery has shown that selectively deuterated small molecules can improve the safety and efficacy for active pharmaceutical ingredients. The advantages derive from changes in metabolism resulting from the kinetic isotope effect when deuterium is substituted for a hydrogen atom at a structural position where rate limiting C-H bond breaking occurs. This application has pushed the development of precision deuteration strategies in synthetic chemistry that can install deuterium atoms with high regioselectivity and with stereocontrol. Copper-catalyzed alkene transfer hydrodeuteration chemistry has recently been shown to have high stereoselectivity for deuteration at the metabolically important benzyl C-H position. In this case, stereocontrol results in the creation of enantioisotopomers-molecules that are chiral solely by virtue of the deuterium substitution-and chiral analysis techniques are needed to assess the reaction selectivity. It was recently shown that chiral tag molecular rotational resonance (MRR) spectroscopy provides a routine way to measure the enantiomeric excess and establish the absolute configuration of enantioisotopomers. High-throughput implementations of chiral tag MRR spectroscopy are needed to support optimization of the chemical synthesis. A measurement methodology for high-throughput chiral analysis is demonstrated in this work. The high-throughput ee measurements are performed using cavity-enhanced MRR spectroscopy, which reduces measurement times and sample consumption by more than an order-of-magnitude compared to the previous enantioisotopomer analysis using a broadband MRR spectrometer. It is also shown that transitions for monitoring the enantiomers can be selected from a broadband rotational spectrum without the need for spectroscopic analysis. The general applicability of chiral tag MRR spectroscopy is illustrated by performing chiral analysis on six enantioisotopomer reaction products using a single molecule as the tag for chiral discrimination.
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Affiliation(s)
| | - Zoua Pa Vang
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53233-1881, United States
| | - Haley N Scolati
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, United States
| | - Justin L Neill
- BrightSpec Inc., Charlottesville, Virginia 22903, United States
| | - Brooks H Pate
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904-4319, United States
| | - Joseph R Clark
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53233-1881, United States
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6
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Matulevičiūtė G, Kleizienė N, Račkauskienė G, Martynaitis V, Bieliauskas A, Šachlevičiūtė U, Jankauskas R, Bartkus MR, Sløk FA, Šačkus A. Facile synthesis of new N-(aminocycloalkylene)amino acid compounds using chiral triflate esters with N-Boc-aminopyrrolidines and N-Boc-aminopiperidines. RSC Adv 2023; 13:21378-21394. [PMID: 37469966 PMCID: PMC10353522 DOI: 10.1039/d3ra03060a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 07/12/2023] [Indexed: 07/21/2023] Open
Abstract
In this study, we prepared a series of new N-(aminocycloalkylene)amino acid derivatives for use in chiral building blocks. The method was based on the conversion of enantiopure α-hydroxy acid esters into the corresponding chiral triflate esters, which were displaced by a nucleophilic substitution SN2 reaction with aminopyrrolidine and aminopiperidine derivatives, and the inversion of the configuration to give methyl 2-[(Boc-amino)cycloamin-1-yl]alkanoates with good yield and high enantiomeric and diastereomeric purity. Synthesized 2-[(Boc-amino)piperidin-1-yl]propanoates combined with ethyl l-phenylalaninate gave new chiral N-Boc- and N-nosyl-dipeptides containing a piperidine moiety. The structures were elucidated by 1H-, 13C-, and 15N-NMR spectroscopy, high-resolution mass spectrometry, and X-ray crystallography analyses.
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Affiliation(s)
- Gita Matulevičiūtė
- Institute of Synthetic Chemistry, Kaunas University of Technology K. Baršausko g. 59 Kaunas LT-51423 Lithuania
- Department of Organic Chemistry, Kaunas University of Technology Radvilėnų pl. 19 Kaunas LT-50254 Lithuania
| | - Neringa Kleizienė
- Institute of Synthetic Chemistry, Kaunas University of Technology K. Baršausko g. 59 Kaunas LT-51423 Lithuania
| | - Greta Račkauskienė
- Institute of Synthetic Chemistry, Kaunas University of Technology K. Baršausko g. 59 Kaunas LT-51423 Lithuania
| | - Vytas Martynaitis
- Department of Organic Chemistry, Kaunas University of Technology Radvilėnų pl. 19 Kaunas LT-50254 Lithuania
| | - Aurimas Bieliauskas
- Institute of Synthetic Chemistry, Kaunas University of Technology K. Baršausko g. 59 Kaunas LT-51423 Lithuania
| | - Urtė Šachlevičiūtė
- Institute of Synthetic Chemistry, Kaunas University of Technology K. Baršausko g. 59 Kaunas LT-51423 Lithuania
| | - Rokas Jankauskas
- Institute of Synthetic Chemistry, Kaunas University of Technology K. Baršausko g. 59 Kaunas LT-51423 Lithuania
| | - Martynas R Bartkus
- Institute of Synthetic Chemistry, Kaunas University of Technology K. Baršausko g. 59 Kaunas LT-51423 Lithuania
| | - Frank A Sløk
- Vipergen ApS Gammel Kongevej 23A Copenhagen V DK-1610 Denmark
| | - Algirdas Šačkus
- Institute of Synthetic Chemistry, Kaunas University of Technology K. Baršausko g. 59 Kaunas LT-51423 Lithuania
- Department of Organic Chemistry, Kaunas University of Technology Radvilėnų pl. 19 Kaunas LT-50254 Lithuania
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7
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Błaszczyk J, Bujnicki B, Pokora-Sobczak P, Mielniczak G, Sieroń L, Kiełbasiński P, Drabowicz J. New Optically Active tert-Butylarylthiophosphinic Acids and Their Selenium Analogues as the Potential Synthons of Supramolecular Organometallic Complexes: Syntheses and Crystallographic Structure Determination. Molecules 2023; 28:molecules28114298. [PMID: 37298774 DOI: 10.3390/molecules28114298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 05/18/2023] [Accepted: 05/22/2023] [Indexed: 06/12/2023] Open
Abstract
The aim of the research described in this publication is two-fold. The first is a detailed description of the synthesis of a series of compounds containing a stereogenic heteroatom, namely the optically active P-stereogenic derivatives of tert-butylarylphoshinic acids bearing sulfur or selenium. The second is a detailed discussion dedicated to the determination of their structures by an X-ray analysis. Such a determination is needed when considering optically active hetero-oxophosphoric acids as new chiral solvating agents, precursors of new chiral ionic liquids, or ligands in complexes serving as novel organometallic catalysts.
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Affiliation(s)
- Jarosław Błaszczyk
- Division of Organic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łódź, Poland
| | - Bogdan Bujnicki
- Division of Organic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łódź, Poland
| | - Patrycja Pokora-Sobczak
- Division of Organic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łódź, Poland
| | - Grażyna Mielniczak
- Division of Organic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łódź, Poland
| | - Lesław Sieroń
- Institute of General and Ecological Chemistry, Lodz University of Technology, Żeromskiego 116, 90-924 Łódź, Poland
| | - Piotr Kiełbasiński
- Division of Organic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łódź, Poland
| | - Józef Drabowicz
- Division of Organic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łódź, Poland
- Institute of Chemistry, Jan Długosz University in Częstochowa, Armii Krajowej 13/15, 42-200 Częstochowa, Poland
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8
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Liang J, Xu Z, Wu J, Zhao Y. Tailoring the Recognition Property of a 19F-Labeled Gallium-Based NMR Probe: The Influence of the Metal Center. Anal Chem 2023; 95:7569-7574. [PMID: 37129497 DOI: 10.1021/acs.analchem.3c00049] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Chirality is a fundamental property of nature and an essential element of the life process. As the biological activities, metabolic pathways, and toxicity of individual enantiomers are often varied, methods to rapidly and accurately discriminate chiral analytes are in great demand. Here, we report a 19F-labeled gallium-based probe for the enantiodifferentiation of chiral monoamines, diamines, amino alcohols, amino acids, and N-heterocycles. A comparison between the new gallium-based probe and the previously developed aluminum aminotrisphenolate complex was performed. It was revealed that the gallium metal center displays a much stronger affinity toward the amino group compared to the hydroxy group, thereby producing simplified 19F NMR signals for analytes with multiple Lewis basic sites. For sterically bulky analyte, the replacement of the aluminum with gallium is envisioned to expand the binding pocket of the probe to allow different binding models to interconvert rapidly. This feature is important to the creation of easily interpretable 19F signals corresponding to each enantiomer. It is further demonstrated that the gallium-based probe is suitable for the assessment of the enantiomeric excess values of the crude products obtained in asymmetric reactions without the need for purification.
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Affiliation(s)
- Jinhua Liang
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China
| | - Zhenchuang Xu
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Jian Wu
- Instrumental Analysis Center, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Yanchuan Zhao
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
- Key Laboratory of Energy Regulation Materials, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
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9
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Katkova MA, Zabrodina GS, Rumyantcev RV, Zhigulin GY, Muravyeva MS, Shavyrin AS, Sheven DG, Ketkov SY. Praseodymium Metallacrown-Based NMR Probe for Enantioselective Discrimination of Mandelate Anions in Water. Inorg Chem 2023; 62:3827-3835. [PMID: 36802536 DOI: 10.1021/acs.inorgchem.2c04091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Recently, the enhanced interest in water-soluble aminohydroximate Ln(III)-Cu(II) metallacrowns (MC) is largely due to their fascinating structural chemistry, diverse properties and ease of synthesis. We examined the water-soluble praseodymium(III) alaninehydroximate complex Pr(H2O)4[15-MCCu(II)Alaha-5]·3Cl (1) as a highly effective chiral lanthanide shift reagent for NMR analysis of the biologically relevant (R/S)-mandelate (MA) anions in aqueous media. The R-MA and S-MA enantiomers can be easily discriminated in the presence of small (1.2-6.2 mol %) amounts of MC 1 by the 1H NMR signals of multiple protons exhibiting an enantiomeric shift difference (ΔΔδ) of 0.06 ppm up to 0.31 ppm. Additionally, a possibility of coordination of MA to the metallacrown was investigated by the ESI-MS technique and a Density Functional Theory modeling of the molecular electrostatic potential and noncovalent interactions.
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Affiliation(s)
- Marina A Katkova
- G. A. Razuvaev Institute of Organometallic Chemistry RAS, Nizhny Novgorod 603950, Russia
| | - Galina S Zabrodina
- G. A. Razuvaev Institute of Organometallic Chemistry RAS, Nizhny Novgorod 603950, Russia
| | - Roman V Rumyantcev
- G. A. Razuvaev Institute of Organometallic Chemistry RAS, Nizhny Novgorod 603950, Russia
| | - Grigory Yu Zhigulin
- G. A. Razuvaev Institute of Organometallic Chemistry RAS, Nizhny Novgorod 603950, Russia
| | - Maria S Muravyeva
- G. A. Razuvaev Institute of Organometallic Chemistry RAS, Nizhny Novgorod 603950, Russia
| | - Andrey S Shavyrin
- G. A. Razuvaev Institute of Organometallic Chemistry RAS, Nizhny Novgorod 603950, Russia
| | - Dmitriy G Sheven
- Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk 630090, Russia
| | - Sergey Yu Ketkov
- G. A. Razuvaev Institute of Organometallic Chemistry RAS, Nizhny Novgorod 603950, Russia
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10
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Chen YT, Li B, Chen JL, Su XC. Stereospecific recognition of a chiral centre over multiple flexible covalent bonds by 19F-NMR. Analyst 2023; 148:233-238. [PMID: 36537694 DOI: 10.1039/d2an01632j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
High performance in chiral recognition by a reactive 19F-tag was demonstrated for a variety of enantiomers. The analytes with up to five flexible covalent bonds from the chiral center can be discriminated by a sensitive chiral reporter manifested in the 19F-NMR spectrum. Simultaneous identification of chiral amines in a mixture and high accuracy ee determination were achieved.
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Affiliation(s)
- Ya-Ting Chen
- State Key Laboratory of Elemento-Organic Chemistry, Tianjin Key Laboratory of Biosensing and Molecular Recognition College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Bin Li
- State Key Laboratory of Elemento-Organic Chemistry, Tianjin Key Laboratory of Biosensing and Molecular Recognition College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Jia-Liang Chen
- State Key Laboratory of Elemento-Organic Chemistry, Tianjin Key Laboratory of Biosensing and Molecular Recognition College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Xun-Cheng Su
- State Key Laboratory of Elemento-Organic Chemistry, Tianjin Key Laboratory of Biosensing and Molecular Recognition College of Chemistry, Nankai University, Tianjin 300071, China.
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11
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Marta TB, Argondizzo AC, da Silva Oliboni R, Silva MS. NMR chiral recognition of lipoic acid by cinchonidine CSA: A stereocenter beyond the organic function. Chirality 2023; 35:40-48. [PMID: 36336792 DOI: 10.1002/chir.23514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 10/20/2022] [Accepted: 10/21/2022] [Indexed: 11/09/2022]
Abstract
Alpha-lipoic acid is a natural product that possesses distinct pharmacological properties. Lipoic acid is a short-chain fatty acid containing an asymmetric carbon at five bonds of distance to the organic function. Herein, we developed a nuclear magnetic resonance protocol to access the chiral recognition of lipoic acid in a simple and rapid procedure employing cinchonidine as a cheap chiral solvation agent in deuterated chloroform. To optimize this method, a statistical design of the experimental model was performed to produce a clear understanding of the optimal concentration, temperature, and molar ratio parameters. Based on the obtained spectra, the cinchonidine H8 -H9 scalar coupling indicated a conformational preference in the chiral discrimination procedure. Density functional theory calculations established a proximity between the asymmetric center of lipoic acid and the aromatic moiety of cinchonidine, clarifying possible conformations in this ion-pair interaction. The described protocol demonstrates how far is far enough to chiral discrimination using a chiral solvation agent, expanding the method to compounds that contain a remote stereocenter.
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Affiliation(s)
- Talia Behnen Marta
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, Pelotas, Rio Grande do Sul, Brazil
| | - Augusto Cardozo Argondizzo
- Grupo de Catálise e Estudos Teóricos, Universidade Federal de Pelotas - UFPel, Pelotas, Rio Grande do Sul, Brazil
| | - Robson da Silva Oliboni
- Grupo de Catálise e Estudos Teóricos, Universidade Federal de Pelotas - UFPel, Pelotas, Rio Grande do Sul, Brazil
| | - Márcio Santos Silva
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, Pelotas, Rio Grande do Sul, Brazil
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12
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Carlson CD, Hazrah AS, Mason D, Yang Q, Seifert NA, Xu Y. Alternating 1-Phenyl-2,2,2-Trifluoroethanol Conformational Landscape With the Addition of One Water: Conformations and Large Amplitude Motions. J Phys Chem A 2022; 126:7250-7260. [PMID: 36191084 DOI: 10.1021/acs.jpca.2c05803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The 1:1 adduct of 1-phenyl-2,2,2-trifluoroethanol (PhTFE), a chiral fluoroalcohol, with water was investigated using chirped pulse Fourier transform microwave spectroscopy and computational methods. While PhTFE itself was predicted to have three minima, I (gauche+), II (trans), and III (gauche-), only I and II were stable and only I was observed experimentally. A systematic search of the PhTFE···H2O conformational landscape identified 110 stable minima, 14 of which are within a 15 kJ mol-1 energy window. Rotational spectra of the two PhTFE···H2O conformers along with several deuterium and 18O isotopologues were assigned, and the isotopic data were used to verify the corresponding structures. In the two observed monohydrate conformers, one contains PhTFE I where the water subunit is inserted into the existing intramolecular OH···F contact of I, and the binary adduct is stabilized by two intermolecular contacts: OH···OW and HW···F, whereas the other contains PhTFE II where the water subunit interacts with both the alcohol hydrogen and phenyl ring of II, demonstrating that interaction with water sufficiently stabilizes II for its observation in a jet expansion. Interestingly, the predicted electric dipole moment components at the identified minima deviate considerably from the experimental ones. Such deviations were analyzed in terms of dynamic effects associated with the large amplitude motions of the unbound HW. In addition, tunnelling effects associated with the exchange of the bonded and nonbonded HW were also discussed.
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Affiliation(s)
- Colton D Carlson
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Arsh S Hazrah
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Daniel Mason
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Qian Yang
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Nathan A Seifert
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.,Department of Chemistry and Chemical & Biomedical Engineering, University of New Haven, 300 Boston Post Rd, West Haven, Connecticut 06516, United States
| | - Yunjie Xu
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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13
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K S N, Kumar TN, Reddy Singam SS, Chaudhari SR. Selective Homodecoupled 1D- 1H NMR Experiment for Unravelling Enantiomers. Anal Chem 2022; 94:10299-10303. [PMID: 35834712 DOI: 10.1021/acs.analchem.2c01020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
1H NMR spectroscopy is a quick and easy tool to resolve enantiomers. However, the paradigm of resolution of enantiomers by 1H NMR is a difficult task due to the minor chemical shift differences and overlap of the resonances of the enantiomers. In the current study, we have performed the conventional selective homodecoupling 1D-1H NMR experiment to achieve chiral resolutions. The predominant features of the proposed methods are (a) high sensitivity as opposed to routinely employed pure shift NMR experiments, (b) easy optimization like conventional 1D-1H NMR, and (c) an artifact-free spectrum. The application of the method has been exhibited in the measurement of proton chemical shift differences between diastereomers and enantiomer excess (ee). The broad use of the proposed method was demonstrated by employing the six samples utilizing the chiral solvating and derivatizing agents.
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Affiliation(s)
- Naresh K S
- Department of Spice and Flavour Science, CSIR - Central Food Technological Research Institute, Mysuru, Karnataka 570020, India.,AcSIR - Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201002, India
| | - Theerthan N Kumar
- Department of Spice and Flavour Science, CSIR - Central Food Technological Research Institute, Mysuru, Karnataka 570020, India
| | - Siva Sankara Reddy Singam
- Department of Food Safety and Analytical Quality Control Laboratory, CSIR - Central Food Technological Research Institute, Mysuru, Karnataka 570020, India.,AcSIR - Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201002, India
| | - Sachin R Chaudhari
- Department of Spice and Flavour Science, CSIR - Central Food Technological Research Institute, Mysuru, Karnataka 570020, India.,AcSIR - Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201002, India
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14
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Chen YT, Li B, Chen JL, Su XC. Simultaneous Discrimination and Quantification of Enantiomeric Amino Acids under Physiological Conditions by Chiral 19F NMR Tag. Anal Chem 2022; 94:7853-7860. [PMID: 35617740 DOI: 10.1021/acs.analchem.2c00218] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Enantiomeric analysis is of great significance in chemistry, chemical biology and pharmaceutical research. We herein propose a chiral 19F NMR tag containing an amino reactive NHS group to discriminate the enantiomeric amino acids under physiological conditions by NMR spectroscopy. The chiral 19F NMR tag readily forms stable amide products with the amino acids in aqueous solution. The stereospecific chemistry of enantiomeric amino acids is discriminated by a stereogenic carbon bonded with a 19F atom and is therefore decoded by the 19F reporter and manifested in the distinct 19F chemical shift. The chemical shift difference (ΔΔδ) of the chiral 19F NMR tag derived enantiomeric amino acids variants has a broad chemical shift range between -1.13 to 1.68 ppm, indicating the high sensitivity of the chiral 19F NMR tag to the stereospecific environment surrounding the individual amino acids. The distinguishable chemical shift produced by the chiral 19F NMR tag permits simultaneous discrimination and quantification of the enantiomeric amino acids in a mixture. The high fidelity of the chiral 19F NMR tag affords high-accuracy determination of the enantiomeric composition of amino acids by simple 1D NMR under physiological conditions.
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Affiliation(s)
- Ya-Ting Chen
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Bin Li
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jia-Liang Chen
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xun-Cheng Su
- State Key Laboratory of Elemento-organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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15
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Yu Y, Yang G, Zhang S, Liu M, Xu S, Wang C, Li M, Zhang SXA. Wide-Range and Highly Sensitive Chiral Sensing by Discrete 2D Chirality Transfer on Confined Surfaces of Au(I)-Thiolate Nanosheets. ACS NANO 2022; 16:148-159. [PMID: 34898188 DOI: 10.1021/acsnano.1c04693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Circular dichroism (CD) chiral sensing is very promising to meet the ever-increasing demands for high-throughput chiral analysis in asymmetric synthesis. However, it is still very challenging to sensitively quantify the composition of enantiomers in a wide concentration range because the existing sensing systems show either linear CD response resultant from stoichiometric chiral transfer or nonlinear CD response resultant from amplified chiral transfer and thus have the drawbacks of low sensitivity and narrow quantification range, respectively. Herein, we propose a sensing system of two-dimensional (2D) Au(I)-thiolate nanosheets. The disordered interligand interactions on the confined surfaces of nanosheets enable the formation of discrete amplified chiral domains around the adsorbed chiral analytes, resulting in a linearly amplified chiral transfer behavior, which provides a solution for highly sensitive and wide-range quantification of enantiomer compositions. Taking (1R, 2R)-(-)- and (1S, 2S)-(+)-1,2-diamino cyclohexanes as example analytes, the concentration and full-range enantiomeric excess (ee) values have been quickly determined by adsorbing them on the surface of Au(I)-MPA (MPA: 3-mercaptopropionic acid) nanosheets in the concentration range of 1.0 × 10-6 to 4.0 × 10-5 M. By engineering the surface functional groups, Au(I)-thiolate nanosheets can be extended to sense other types of analytes, and several polyols with multiple chiral centers have been sensed by boronic acid functionalized nanosheets at the 10-7 M level. The high performances, good extendibility, and one-pot high-yield aqueous synthesis ensure these Au(I)-thiolate nanosheets can be developed as a practical and powerful chiral sensing platform.
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Affiliation(s)
- Yang Yu
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 130012 Changchun, People's Republic of China
| | - Guojian Yang
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 130012 Changchun, People's Republic of China
| | - Shengrui Zhang
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 130012 Changchun, People's Republic of China
| | - Mo Liu
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 130012 Changchun, People's Republic of China
| | - Shujue Xu
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 130012 Changchun, People's Republic of China
| | - Chunyu Wang
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 130012 Changchun, People's Republic of China
| | - Minjie Li
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 130012 Changchun, People's Republic of China
| | - Sean Xiao-An Zhang
- State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 130012 Changchun, People's Republic of China
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16
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Li H, Xu Z, Zhang S, Jia Y, Zhao Y. Construction of Lewis Pairs for Optimal Enantioresolution via Recognition-Enabled “Chromatographic” 19F NMR Spectroscopy. Anal Chem 2022; 94:2023-2031. [DOI: 10.1021/acs.analchem.1c03783] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Huanhuan Li
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Zhenchuang Xu
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Siquan Zhang
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Yushu Jia
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Yanchuan Zhao
- The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
- Key Laboratory of Energy Regulation Materials, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
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17
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Zhang X, Xu J, Sun Z, Bian G, Song L. NMR analysis of the enantiomeric purity of chiral diols by a new chiral boron agent. RSC Adv 2022; 12:4692-4696. [PMID: 35425523 PMCID: PMC8981704 DOI: 10.1039/d2ra00428c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 02/01/2022] [Indexed: 11/21/2022] Open
Abstract
A new boric agent with bridged structure, boric acid D, was first synthesized and used as an excellent chiral derivative agent for highly efficient enantiodiscrimination of various diols.
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Affiliation(s)
- Xuebo Zhang
- College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, China
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
| | - Jing Xu
- College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, China
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
| | - Zhaofeng Sun
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
| | - Guangling Bian
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
| | - Ling Song
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
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18
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Valentín-Pérez Á, Rosa P, Hillard EA, Giorgi M. Chirality determination in crystals. Chirality 2021; 34:163-181. [PMID: 34766388 DOI: 10.1002/chir.23377] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 08/26/2021] [Accepted: 09/13/2021] [Indexed: 12/26/2022]
Abstract
This tutorial review article discusses chirality determination in the solid state, both in single crystals and in crystal assemblies, with an emphasis on X-ray diffraction. The main principles of using X-ray diffraction to reliably determine absolute structure are summarized, and the complexity which can be encountered in chiral structures-kryptoracemates, scalemates, and inversion twinning-is illustrated with examples from our laboratories and the literature. We then address the problem of the bulk crystallization and discuss different techniques to determine chirality in a large assembly of crystal structures, with a special prominence given to an X-ray natural circular dichroism mapping technique that we recently reported.
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Affiliation(s)
| | - Patrick Rosa
- Univ. Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, Cedex, France
| | - Elizabeth A Hillard
- Univ. Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, Cedex, France.,CNRS, Univ. Bordeaux, CRPP, UMR 5031, Pessac, France
| | - Michel Giorgi
- Aix Marseille Univ, CNRS, Centrale Marseille, FSCM, Spectropole, Marseille, France
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19
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Mitschke N, Eruçar G, Fsadni MH, Roberts AR, Sadeghi MM, Golding BT, Christoffers J, Wilkes H. Enantiopure 2,9‐Dideuterodecane – Preparation and Proof of Enantiopurity. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nico Mitschke
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
- Institut für Chemie und Biologie des Meeres (ICBM) Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Gülsera Eruçar
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Miriam H. Fsadni
- School of Natural & Environmental Sciences, Bedson Building Newcastle University NE1 7RU Newcastle upon Tyne UK
| | - Amy R. Roberts
- School of Natural & Environmental Sciences, Bedson Building Newcastle University NE1 7RU Newcastle upon Tyne UK
| | - Majid M. Sadeghi
- School of Natural & Environmental Sciences, Bedson Building Newcastle University NE1 7RU Newcastle upon Tyne UK
| | - Bernard T. Golding
- School of Natural & Environmental Sciences, Bedson Building Newcastle University NE1 7RU Newcastle upon Tyne UK
| | - Jens Christoffers
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Heinz Wilkes
- Institut für Chemie und Biologie des Meeres (ICBM) Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
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20
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Nakakoji T, Sato H, Ono D, Miyake H, Mieda E, Shinoda S, Tsukube H, Kawasaki H, Arakawa R, Shizuma M. One-pot analysis of enantiomeric excess of free amino acids by electrospray ionization mass spectrometry. RSC Adv 2021; 11:36237-36241. [PMID: 35492793 PMCID: PMC9043479 DOI: 10.1039/d1ra06542d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 11/03/2021] [Indexed: 12/13/2022] Open
Abstract
An electrospray ionization mass spectrometric method for the simultaneous analysis of the enantiomeric excess of free amino acids, without chromatographic separation, was demonstrated using a quasi-racemic mixture of deuterium-labelled and unlabelled chiral copper(ii) complexes. This convenient method enables the simultaneous high-sensitivity determination of the enantiomeric excess of 12 amino acids. A mass spectrometric method for the simultaneous analysis of the enantiomeric excess of free amino acids, without chromatographic separation, was demonstrated using a quasi-racemic mixture of deuterium-labelled and unlabelled chiral Cu(ii) complexes.![]()
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Affiliation(s)
- Takashi Nakakoji
- Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Hirofumi Sato
- Osaka Research Institute of Industrial Science and Technology, Morinomiya, Joto-ku, Osaka 536-8553, Japan
| | - Daisuke Ono
- Osaka Research Institute of Industrial Science and Technology, Morinomiya, Joto-ku, Osaka 536-8553, Japan
| | - Hiroyuki Miyake
- Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Eiko Mieda
- Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Satoshi Shinoda
- Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Hiroshi Tsukube
- Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Hideya Kawasaki
- Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, Yamate-cho, Suita, Osaka 564-8680, Japan
| | - Ryuichi Arakawa
- Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, Yamate-cho, Suita, Osaka 564-8680, Japan
| | - Motohiro Shizuma
- Osaka Research Institute of Industrial Science and Technology, Morinomiya, Joto-ku, Osaka 536-8553, Japan
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21
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Negatively charged cyclodextrins: Synthesis and applications in chiral analysis-A review. Carbohydr Polym 2020; 256:117517. [PMID: 33483038 DOI: 10.1016/j.carbpol.2020.117517] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 12/02/2020] [Accepted: 12/11/2020] [Indexed: 12/12/2022]
Abstract
The negatively charged cyclodextrins (CDs) play an important role in chiral analysis due to the additional electrostatic effect beyond the host-guest inclusion, especially in enantioanalysis of positively charged and electrically neutral analytes. This review presents recent advances in application of anionic CDs for enantioanalysis during the past five years. Firstly, the synthesis approaches of random substitution and single isomers of anionic CDs are briefly discussed. The main part focuses on the chiral analysis using anionic CDs in various analytical techniques, including capillary electrophoresis, high-performance liquid chromatography, capillary electrochromatography, counter current chromatography, nuclear magnetic resonance, etc. Particular attention is given to the capillary electrophoresis application since charged CDs could be used as a carrier of enantiomers by virtue of their self-mobility and offer an easy adjustment of the enantiomer migration order. Finally, future opportunities are also discussed in the conclusion of this review.
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22
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Inclusion complexes of tricyclic drugs and β-cyclodextrin: Inherent chirality and dynamic behaviour. Int J Pharm 2020; 588:119775. [PMID: 32805385 DOI: 10.1016/j.ijpharm.2020.119775] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 08/12/2020] [Accepted: 08/13/2020] [Indexed: 11/21/2022]
Abstract
Amitriptyline (AMT) and cyclobenzaprine (CBZ) are tricyclic drugs used as antidepressant and muscle relaxant, respectively. They show inherently chirality, i.e. they are chiral due to the lack of any symmetry element. As they are used as racemic mixture, diastereomeric inclusion complexes are formed via encapsulation in homochiral βCD. In this work we show that a suitable combination of NMR methods easily provides details on the chiral recognition, geometry of complexation, rotational dynamics and spatial proximity of selected atom pairs. In particular, we show that 13C NMR can be used to unambiguously assess chiral recognition, demonstrating a higher performance over 1H NMR. The mole fraction of the bound drug and the association constant can be worked out through diffusion experiments, whereas the combination of non-selective, selective and bi-selective relaxation spectra gave insights into the rotational motion of the complexed drug and the spatial proximity of selected proton pairs. The toolkit here proposed provides a thorough characterization of CD/drug inclusion complexes from a physicochemical point of view. This can constructively complement the conventional pharmacological and pharmacokinetic experiments, and can shed light on the understanding of CD/drug formulations.
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23
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Matviychuk Y, Steimers E, von Harbou E, Holland DJ. Bayesian approach for automated quantitative analysis of benchtop NMR data. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2020; 319:106814. [PMID: 32950022 DOI: 10.1016/j.jmr.2020.106814] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 07/28/2020] [Accepted: 08/24/2020] [Indexed: 06/11/2023]
Abstract
Low-cost, user-friendly benchtop NMR instruments are often touted as a "one-click" solution for data acquisition, however insufficient peak dispersion in their spectra often reduces the accuracy of quantification and requires user expertise with sophisticated processing tools. Our work aims to facilitate the wide acceptance of benchtop NMR instruments as a viable and effective substitute for cryogenic magnets. We propose an algorithmic approach that completely automates the routine analysis of sets of samples with similar compositions - the problem that often underlies many industrial applications concerned with reaction and process monitoring and quality control. Our solution is rooted in the idea of parametric modelling formulated in terms of Bayesian statistics, which effectively incorporates prior knowledge about the studied system (such as concentration-dependent chemical shift changes) that is usually available in industrial applications. Furthermore, the use of quantum mechanical models for chemical species makes our approach invariant to the spectrometer field strength - a necessary prerequisite for the successful analysis of benchtop data. We demonstrate the performance of our method with two representative sets of samples: mixtures of alcohols and acetates, and aqueous mixtures of biologically relevant species. In these examples, our fully automated analysis of benchtop spectra achieves average errors in concentrations of 0.01 mol/mol and 0.02 mol/mol respectively. Our method is competitive with the traditional processing approaches of well resolved high-field data and has the potential to bring the benefits of NMR even to a small chemistry laboratory.
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Affiliation(s)
- Yevgen Matviychuk
- University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand.
| | - Ellen Steimers
- Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße 44, 67663 Kaiserslautern, Germany
| | - Erik von Harbou
- Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße 44, 67663 Kaiserslautern, Germany
| | - Daniel J Holland
- University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
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24
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Li GW, Wang XJ, Cui DD, Zhang YF, Xu RY, Shi SH, Liu LT, Wang MC, Liu HM, Lei XX. Azaheterocyclic diphenylmethanol chiral solvating agents for the NMR chiral discrimination of alpha-substituted carboxylic acids. RSC Adv 2020; 10:34605-34611. [PMID: 35514411 PMCID: PMC9056771 DOI: 10.1039/d0ra06312f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 08/24/2020] [Indexed: 12/02/2022] Open
Abstract
A series of small-membered heterocycle probes, so-called azaheterocycle-containing diphenylmethanol chiral solvating agents (CSAs), have been developed for NMR enantiodiscrimination. These chiral sensors were readily synthesized were inexpensive and efficiently used for the chiral analysis of alpha-substituted carboxylic acids. The sensing method was operationally simple and the processing was straightforward. Notably, we propose (S)-aziridinyl diphenylmethanol as a promising CSA, which has excellent chiral discriminating properties and offers multiple detectable possibilities pertaining to the 1H NMR signals of diagnostic split protons (including 25 examples, up to 0.194 ppm, 77.6 Hz). Its ability to detect the molecular recognition of fluorinated carboxylic acids were further investigated, with a good level of discrimination via the 19F NMR spectroscopic analysis. In addition, an accurate enantiomeric excess (ee) analysis of the p-methoxyl-mandelic acid with different optical compositions have been calculated based on the integration of well-separated proton signals.
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Affiliation(s)
- Gao-Wei Li
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
- School of Pharmaceutical Sciences, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Xiao-Juan Wang
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Dan-Dan Cui
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Yu-Fei Zhang
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Rong-Yao Xu
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Shuai-Hua Shi
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Lan-Tao Liu
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Min-Can Wang
- School of Pharmaceutical Sciences, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Hong-Min Liu
- School of Pharmaceutical Sciences, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Xin-Xiang Lei
- School of Pharmaceutical Sciences, South-Central University for Nationalities Wuhan 430074 P. R. China
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25
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Malinowska M, Jarzyński S, Pieczonka A, Rachwalski M, Leśniak S, Zawisza A. Optically Pure Aziridin-2-yl Methanols as Readily Available 1H NMR Sensors for Enantiodiscrimination of α-Racemic Carboxylic Acids Containing Tertiary or Quaternary Stereogenic Centers. J Org Chem 2020; 85:11794-11801. [PMID: 32805106 PMCID: PMC7506949 DOI: 10.1021/acs.joc.0c01564] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
![]()
Enantiopure
aziridin-2-yl methanols 3–7 are used
as highly effective sensors for enantiodiscrimination
of α-racemic carboxylic acids containing tertiary or quaternary
stereogenic centers. A linear correlation between theoretical and
observed % ee values for CSA-3 and enantiomerically enriched
samples of mandelic acid has been observed, indicating the possible
application of these compounds in the ee determination. The free NH
and OH groups in 3–7 ensure good
recognition.
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Affiliation(s)
- Martyna Malinowska
- Department of Organic and Applied Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland
| | - Szymon Jarzyński
- Department of Organic and Applied Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland
| | - Adam Pieczonka
- Department of Organic and Applied Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland
| | - Michał Rachwalski
- Department of Organic and Applied Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland
| | - Stanisław Leśniak
- Department of Organic and Applied Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland
| | - Anna Zawisza
- Department of Organic and Applied Chemistry, University of Łódź, Tamka 12, 91-403 Łódź, Poland
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26
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27
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Abstract
A new class of bambus[4]urils (BU[4]s) composed of asymmetric N,N'-disubstituted glycoluril subunits with different alkyl groups were designed, synthesized, and fully characterized by NMR techniques and X-ray crystallography. Structural studies showed that four macrocyclic diastereoisomers are possible: two Sn symmetric achiral macrocycles and two macrocycles that are "inherently" chiral. The relative "head-to-tail" arrangement of the N-substituents in Bn4Me4BU[4], 5a, clearly observed by X-ray spectroscopy analysis, determines the overall symmetry of the bambusuril structure. Chiral Pr4Me4BU[4], 4b, was resolved by chiral high-performance liquid chromatography (HPLC) into its enantiomers, and all four inherently chiral bambusuril pairs (two Pr4Me4BU[4] and two Bn4Me4BU[4] stereoisomers, 4b, 4d, 5b, and 5d) were clearly observed by 1H NMR spectroscopy with the aid of (R)-BINOL as a chiral solvating agent. This latter methodology provides a rapid and powerful approach for investigating the enantiopurity of inherently chiral cavitands, which complements and augments the conventional chromatographic approaches.
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Affiliation(s)
| | - Ofer Reany
- Department of Natural Sciences, The Open University of Israel, Ra'anana 4353701, Israel
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28
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Hiller NDJ, do Amaral e Silva NA, Tavares TA, Faria RX, Eberlin MN, de Luna Martins D. Arylboronic Acids and their Myriad of Applications Beyond Organic Synthesis. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000396] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Noemi de Jesus Hiller
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
| | - Nayane Abreu do Amaral e Silva
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
| | - Thais Apolinário Tavares
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
| | - Robson Xavier Faria
- Laboratório de Toxoplasmose e outras Protozooses; Instituto Oswaldo Cruz, Fiocruz; Av. Brasil, 4365 Manguinhos Rio de Janeiro RJ 21040-360 Brasil
| | - Marcos Nogueira Eberlin
- Mackenzie Presbyterian University; School of Engineering; Rua da Consolação, 930 SP 01302-907 São Paulo Brasil
| | - Daniela de Luna Martins
- Instituto de Química; Laboratório de Catálise e Síntese (Lab CSI); Laboratório 413; Universidade Federal Fluminense; Outeiro de São João Batista s/n; Campus do Valonguinho, Centro Niterói RJ 24020-141 Brasil
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29
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Li G, Ma M, Wang G, Wang X, Lei X. Efficient Enantiodifferentiation of Carboxylic Acids Using BINOL-Based Amino Alcohol as a Chiral NMR Solvating Agent. Front Chem 2020; 8:336. [PMID: 32432082 PMCID: PMC7213237 DOI: 10.3389/fchem.2020.00336] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 04/01/2020] [Indexed: 12/30/2022] Open
Abstract
A new optically active BINOL-amino alcohol has been designed and synthesized in a good yield and applied as chiral nuclear magnetic resonance (NMR) solvating agent for enantioselective recognition. Analysis by 1H NMR spectroscopy demonstrated that it has excellent enantiodifferentiation properties toward carboxylic acids and non-steroidal anti-inflammatory drugs (14 examples). The non-equivalent chemical shifts (up to 0.641 ppm) of various mandelic acids were evaluated by the reliable peak of well-resolved 1H NMR signals. In addition, enantiomeric excesses of the ortho-chloro-mandelic acid with different enantiomeric ratio were calculated based on integration of proton well-separated splitting signals.
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Affiliation(s)
- Gaowei Li
- College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu, China
| | - Minshan Ma
- School of Pharmaceutical Sciences, South Central University for Nationalities, Wuhan, China
| | - Guifang Wang
- School of Pharmaceutical Sciences, South Central University for Nationalities, Wuhan, China
| | - Xiaojuan Wang
- College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu, China
| | - Xinxiang Lei
- School of Pharmaceutical Sciences, South Central University for Nationalities, Wuhan, China
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30
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Hassan DS, Thanzeel FY, Wolf C. Stereochemical analysis of chiral amines, diamines, and amino alcohols: Practical chiroptical sensing based on dynamic covalent chemistry. Chirality 2020; 32:457-463. [PMID: 32027416 DOI: 10.1002/chir.23185] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 01/09/2020] [Accepted: 01/10/2020] [Indexed: 12/26/2022]
Abstract
Practical chiroptical sensing with a small group of commercially available aromatic aldehydes is demonstrated. Schiff base formation between the electron-deficient 2,4-dinitrobenzaldehyde probe and either primary amines, diamines, or amino alcohols proceeds smoothly in chloroform at room temperature and is completed in the presence of molecular sieves within 2.5 hours. The substrate binding coincides with a distinct circular dichroism signal induction at approximately 330 nm, which can be correlated to the absolute configuration and enantiomeric composition of the analyte. The usefulness of this sensing method is highlighted with the successful sensing of 18 aliphatic and aromatic amines and amino alcohols and five examples showing quantitative %ee determination with good accuracy.
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Affiliation(s)
- Diandra S Hassan
- Department of Chemistry, Georgetown University, Washington, D.C., USA
| | - F Yushra Thanzeel
- Department of Chemistry, Georgetown University, Washington, D.C., USA
| | - Christian Wolf
- Department of Chemistry, Georgetown University, Washington, D.C., USA
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31
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Day IJ. Matrix-assisted DOSY. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2020; 116:1-18. [PMID: 32130955 DOI: 10.1016/j.pnmrs.2019.09.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 08/30/2019] [Accepted: 09/01/2019] [Indexed: 06/10/2023]
Abstract
The analysis of mixtures by NMR spectroscopy is challenging. Diffusion-ordered NMR spectroscopy enables a pseudo-separation of species based on differences in their translational diffusion coefficients. Under the right circumstances, this is a powerful technique; however, when molecules diffuse at similar rates separation in the diffusion dimension can be poor. In addition, spectral overlap also limits resolution and can make interpretation challenging. Matrix-assisted diffusion NMR seeks to improve resolution in the diffusion dimension by utilising the differential interaction of components in the mixture with an additive to the solvent. Tuning these matrix-analyte interactions allows the diffusion resolution to be optimised. This review presents the background to matrix-assisted diffusion experiments, surveys the wide range of matrices employed, including chromatographic stationary phases, surfactants and polymers, and demonstrates the current state of the art.
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Affiliation(s)
- Iain J Day
- School of Life Sciences, University of Sussex, Falmer, Brighton BN1 9QJ, UK.
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32
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Lesot P, Aroulanda C, Berdagué P, Meddour A, Merlet D, Farjon J, Giraud N, Lafon O. Multinuclear NMR in polypeptide liquid crystals: Three fertile decades of methodological developments and analytical challenges. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2020; 116:85-154. [PMID: 32130960 DOI: 10.1016/j.pnmrs.2019.10.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 10/24/2019] [Indexed: 06/10/2023]
Abstract
NMR spectroscopy of oriented samples makes accessible residual anisotropic intramolecular NMR interactions, such as chemical shift anisotropy (RCSA), dipolar coupling (RDC), and quadrupolar coupling (RQC), while preserving high spectral resolution. In addition, in a chiral aligned environment, enantiomers of chiral molecules or enantiopic elements of prochiral compounds adopt different average orientations on the NMR timescale, and hence produce distinct NMR spectra or signals. NMR spectroscopy in chiral aligned media is a powerful analytical tool, and notably provides unique information on (pro)chirality analysis, natural isotopic fractionation, stereochemistry, as well as molecular conformation and configuration. Significant progress has been made in this area over the three last decades, particularly using polypeptide-based chiral liquid crystals (CLCs) made of organic solutions of helically chiral polymers (as PBLG) in organic solvents. This review presents an overview of NMR in polymeric LCs. In particular, we describe the theoretical tools and the major NMR methods that have been developed and applied to study (pro)chiral molecules dissolved in such oriented solvents. We also discuss the representative applications illustrating the analytical potential of this original NMR tool. This overview article is dedicated to thirty years of original contributions to the development of NMR spectroscopy in polypeptide-based chiral liquid crystals.
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Affiliation(s)
- Philippe Lesot
- Université Paris Sud/Université Paris-Saclay, UMR CNRS 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, ICMMO, Equipe RMN en Milieu Orienté, Bât. 410, 15 rue du Doyen Georges Poitou, F-91405 Orsay cedex, France; Centre National de la Recherche Scientifique (CNRS), France.
| | - Christie Aroulanda
- Université Paris Sud/Université Paris-Saclay, UMR CNRS 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, ICMMO, Equipe RMN en Milieu Orienté, Bât. 410, 15 rue du Doyen Georges Poitou, F-91405 Orsay cedex, France
| | - Philippe Berdagué
- Université Paris Sud/Université Paris-Saclay, UMR CNRS 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, ICMMO, Equipe RMN en Milieu Orienté, Bât. 410, 15 rue du Doyen Georges Poitou, F-91405 Orsay cedex, France
| | - Abdelkrim Meddour
- Université Paris Sud/Université Paris-Saclay, UMR CNRS 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, ICMMO, Equipe RMN en Milieu Orienté, Bât. 410, 15 rue du Doyen Georges Poitou, F-91405 Orsay cedex, France
| | - Denis Merlet
- Université Paris Sud/Université Paris-Saclay, UMR CNRS 8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay, ICMMO, Equipe RMN en Milieu Orienté, Bât. 410, 15 rue du Doyen Georges Poitou, F-91405 Orsay cedex, France
| | - Jonathan Farjon
- Centre National de la Recherche Scientifique (CNRS), France; Faculté des Sciences et Techniques de Nantes, UMR CNRS 6230, Chimie et Interdisciplinarité, Synthèse, Analyse, Modélisation, CEISAM, Equipe EBSI, BP 92208, 2 rue de la Houssinière, F-44322 Nantes cedex 3, France
| | - Nicolas Giraud
- Université Paris Descartes, Sorbonne Paris Cité, UMR CNRS 8601, Laboratory of Pharmacological and Toxicological Chemistry and Biochemistry, LPTCB, 45 rue des Saints Pères, F-75006 Paris, France
| | - Olivier Lafon
- Universite de Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR CNRS 8181, Unité de Catalyse et Chimie du Solide, UCCS, F-59000 Lille, France; Institut Universitaire de France (IUF), France
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33
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Prasad D, Mogurampelly S, Chaudhari SR. R-VAPOL-phosphoric acid based 1H and 13C-NMR for sensing of chiral amines and acids. RSC Adv 2020; 10:2303-2312. [PMID: 35494596 PMCID: PMC9048436 DOI: 10.1039/c9ra07803g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 01/04/2020] [Indexed: 01/07/2023] Open
Abstract
Enantiomers have significant importance in pharmaceuticals, biology and modern chemistry and therefore distinguishing and quantifying the enantiomeric forms is of utmost importance. Herein, we propose diphenyl-3,3'-biphenanthryl-4,4'-diyl phosphate (R-VAPOL-PA) as a promising chiral solvating agent to discriminate amines and acids of poly-functional groups such as chiral amines, amino alcohols and hydroxy acids. The methodological approach involves using the nature of hydrogen bonds and ion pairs as a mode of weak interactions to form diastereomers where the probe is associated with enantiomers. The resulting diastereomer difference in the NMR spectrum enables the chiral discrimination with a complete baseline peak separation and an accurate enantiomeric excess (ee) analysis. We also carried out density functional theory (DFT) calculations to understand the complex formation to explain enantiodiscrimination by analysing the formation and stability of different chiral complexes. The binding energy differences between enantiomeric forms revealed by DFT calculations are qualitatively in agreement with the diastereomer difference in the NMR spectrum and unequivocally establishes the suggested experimental protocol of R-VAPOL-PA-based enantiomeric discrimination.
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Affiliation(s)
- Durga Prasad
- Department of Spice and Flavour Science, CSIR-Central Food Technological Research Institute Mysore Karnataka 570020 India
| | - Santosh Mogurampelly
- Department of Physics, Indian Institute of Technology Jodhpur Karwar Rajasthan 342037 India
| | - Sachin R Chaudhari
- Department of Spice and Flavour Science, CSIR-Central Food Technological Research Institute Mysore Karnataka 570020 India
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34
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Mandai K, Tsuchihashi Y, Ashikari Y, Yoshida JI, Nagaki A. 18O-Labeled chiral compounds enable the facile determination of enantioselectivity by mass spectroscopy. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2019.151367] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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35
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Wang SY, Li L, Xiao Y, Wang Y. Recent advances in cyclodextrins-based chiral-recognizing platforms. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.115691] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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36
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Kriegelstein M, Profous D, Lyčka A, Trávníček Z, Přibylka A, Volná T, Benická S, Cankař P. Axially Chiral Trifluoromethylbenzimidazolylbenzoic Acid: A Chiral Derivatizing Agent for α-Chiral Primary Amines and Secondary Alcohols To Determine the Absolute Configuration. J Org Chem 2019; 84:11911-11921. [PMID: 31449414 DOI: 10.1021/acs.joc.9b01770] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Racemic 2-(2-trifluoromethyl)-1H-benzo[d]imidazol-1-yl)benzoic acid (TBBA) was synthesized in three steps from 1-fluoro-2-nitrobenzene. Target (P)- and (M)-TBBA atropisomers were stable with a racemization barrier above 30 kcal/mol. As a chiral derivatizing agent, TBBA showed much higher differences in chemical shifts (ΔδPM) than the conventional Mosher's acid.
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Affiliation(s)
- Michal Kriegelstein
- Department of Organic Chemistry, Faculty of Science , Palacký University , 17. Listopadu 12 , 771 46 Olomouc , Czech Republic
| | - David Profous
- Department of Organic Chemistry, Faculty of Science , Palacký University , 17. Listopadu 12 , 771 46 Olomouc , Czech Republic
| | - Antonín Lyčka
- Faculty of Science , University of Hradec Králové , Rokitanského 62 , CZ-500 03 , Hradec Králové 3 , Czech Republic
| | - Zdeněk Trávníček
- Division of Biologically Active Complexes and Molecular Magnets, Regional Centre of Advanced Technologies and Materials, Faculty of Science , Palacký University , Šlechtitelů 27 , 783 71 Olomouc , Czech Republic
| | - Adam Přibylka
- Department of Organic Chemistry, Faculty of Science , Palacký University , 17. Listopadu 12 , 771 46 Olomouc , Czech Republic
| | - Tereza Volná
- Institute of Molecular and Translation Medicine, Faculty of Medicine and Dentistry , Palacký University , Hněvotínská 5 , 779 00 , Olomouc , Czech Republic
| | - Sandra Benická
- Institute of Molecular and Translation Medicine, Faculty of Medicine and Dentistry , Palacký University , Hněvotínská 5 , 779 00 , Olomouc , Czech Republic
| | - Petr Cankař
- Department of Organic Chemistry, Faculty of Science , Palacký University , 17. Listopadu 12 , 771 46 Olomouc , Czech Republic
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37
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Wang W, Xia X, Bian G, Song L. A chiral sensor for recognition of varied amines based on 19F NMR signals of newly designed rhodium complexes. Chem Commun (Camb) 2019; 55:6098-6101. [PMID: 31069349 DOI: 10.1039/c9cc01942a] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel chiral octahedral rhodium complex containing fluorine has been developed to be an excellent chiral sensor for a variety of amines including diamines, monoamines, amino alcohols and amino acids, showing well distinguishable 19F NMR signals and an accurate measurement of enantiomeric determination.
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Affiliation(s)
- Wei Wang
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
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38
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Yang S, Bian G, Sa R, Song L. Assigning the Absolute Configurations of Chiral Primary Amines Based on Experimental and DFT-Calculated 19F Nuclear Magnetic Resonance. Front Chem 2019; 7:318. [PMID: 31165055 PMCID: PMC6536038 DOI: 10.3389/fchem.2019.00318] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 04/23/2019] [Indexed: 12/26/2022] Open
Abstract
In this work, a novel method for assigning the absolute configuration of a chiral primary amine has been developed based on the experimental and DFT-calculated 19F NMR chemical shift differences of its derived two fluorinated amides by reacting with two enantiomers of a chiral derivatizing agent FPP (α-fluorinated phenylacetic phenylselenoester) separately. Comparing the experimental chemical shift difference Δ δ α - F R , S of (R)-FPA-amide/(S)-FPA-amide with the calculated Δδα-F R,S of (R)-FPA-(R)-amide/(S)-FPA-(R)-amide, if the experimental Δδα-F R,S has the same symbol (positive or negative) as one of the theoretical Δδα-F R,S , the assigned configuration of the amine is considered to be consistent with the theoretical one. Our method could be applied to a broad substrate scope avoiding wrong conclusion due to empirical judgment.
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Affiliation(s)
- Shiwei Yang
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Guangling Bian
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Rongjian Sa
- Institute of Oceanography, Ocean College, Fujian Provincial Key Laboratory of Information Processing and Intelligent Control, Minjiang University, Fuzhou, China
| | - Ling Song
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China
- University of Chinese Academy of Sciences, Beijing, China
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39
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Lesot P, Berdagué P, Meddour A, Kreiter A, Noll M, Reggelin M. 2 H and 13 C NMR-Based Enantiodetection Using Polyacetylene versus Polypeptide Aligning Media: Versatile and Complementary Tools for Chemists. Chempluschem 2019; 84:144-153. [PMID: 31950698 DOI: 10.1002/cplu.201800493] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Indexed: 12/12/2022]
Abstract
In this work, the practical/analytical potential of an L-valine-derived polyacetylene (PLA) lyotropic liquid crystal (LLC) is examined to spectrally discriminate enantiomers (racemic mixture) or enantiotopic directions of a large collection (23) of (pro)chiral model compounds (from rigid to flexible and polar to apolar ones), thus covering various important aspects of enantiomorphism. Experimental 2 H-{1 H} (deuterated analytes and at natural abundance level) and 13 C-{1 H} NMR results are discussed in terms of the difference of 2 H-RQCs or 13 C-RCSAs and compared to those obtained in polypeptide-type LLCs (PBLG). The analysis of the NMR results provides an overview of the enantiodifferentiation capabilities of PLA and gives useful/practical hints for the chemist to select the most appropriate chiral oriented system. Astonishing NAD NMR results were obtained in the case of one of the simplest, chiral alkanes, 3-methylhexane. From a theoretical viewpoint, the data collected highlight the key molecular factors involved in orientation/discrimination processes, as a basis for optimizing computational prediction (molecular dynamics simulation), as well as designing novel helically chiral polymers as new enantiodiscriminating aligning media. In addition, a new, robust and efficient protocol to synthesize PLA and its enantiomer (PDA) on a large scale and with small polydispersities is proposed.
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Affiliation(s)
- Philippe Lesot
- RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Université Paris-Sud/Université Paris-Saclay, Bât. 410, 91405, Orsay cedex, France
| | - Philippe Berdagué
- RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Université Paris-Sud/Université Paris-Saclay, Bât. 410, 91405, Orsay cedex, France
| | - Abdelkrim Meddour
- RMN en Milieu Orienté, ICMMO, UMR CNRS 8182, Université Paris-Sud/Université Paris-Saclay, Bât. 410, 91405, Orsay cedex, France
| | - Alexander Kreiter
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Strasse 4, 64287, Darmstadt, Germany
| | - Markus Noll
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Strasse 4, 64287, Darmstadt, Germany
| | - Michael Reggelin
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Strasse 4, 64287, Darmstadt, Germany
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40
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Intakaew N, Rithchumpon P, Prommin C, Yimklan S, Kungwan N, Thavornyutikarn P, Meepowpan P. Synthesis and characterization of novel chiral derivatizing agents containing β-keto-anthracene adducts (KAAs) by 1H-NMR: aromatic influence and chiral alcohol absolute configuration determination. Org Biomol Chem 2019; 17:541-554. [DOI: 10.1039/c8ob02662a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New chiral derivatizing agents and the effect of aromatic rings were investigated for absolute configuration of chiral alcohols via1H-NMR.
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Affiliation(s)
- Neeranuth Intakaew
- Department of Chemistry
- Faculty of Science
- Chiang Mai University
- Chiang Mai 50200
- Thailand
| | - Puracheth Rithchumpon
- Department of Chemistry
- Faculty of Science
- Chiang Mai University
- Chiang Mai 50200
- Thailand
| | - Chanatkran Prommin
- Department of Chemistry
- Faculty of Science
- Chiang Mai University
- Chiang Mai 50200
- Thailand
| | - Saranphong Yimklan
- Department of Chemistry
- Faculty of Science
- Chiang Mai University
- Chiang Mai 50200
- Thailand
| | - Nawee Kungwan
- Department of Chemistry
- Faculty of Science
- Chiang Mai University
- Chiang Mai 50200
- Thailand
| | | | - Puttinan Meepowpan
- Department of Chemistry
- Faculty of Science
- Chiang Mai University
- Chiang Mai 50200
- Thailand
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41
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Menna M, Imperatore C, Mangoni A, Della Sala G, Taglialatela-Scafati O. Challenges in the configuration assignment of natural products. A case-selective perspective. Nat Prod Rep 2019; 36:476-489. [DOI: 10.1039/c8np00053k] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
An overview by a case study approach on the currently available methods for the configurational analysis of natural products.
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Affiliation(s)
- Marialuisa Menna
- Department of Pharmacy
- University of Naples Federico II
- 80131 Napoli
- Italy
| | | | - Alfonso Mangoni
- Department of Pharmacy
- University of Naples Federico II
- 80131 Napoli
- Italy
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42
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Nath N, Bordoloi P, Barman B, Baishya B, Chaudhari SR. Insight into old and new pure shift nuclear magnetic resonance methods for enantiodiscrimination. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:876-892. [PMID: 29411898 DOI: 10.1002/mrc.4719] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 01/20/2018] [Accepted: 01/23/2018] [Indexed: 06/08/2023]
Abstract
Enantiodiscrimination and their quantification using nuclear magnetic resonance (NMR) spectroscopy has always been a subject of great interest. Proton is the nucleus of choice for enantiodiscrimination due to its high sensitivity and ubiquitous presence in nature. Despite its advantages, enantiodiscrimination suffers from extensive signal splitting by the proton-proton scalar couplings, which give complex multiplets that spread over a frequency range of some tens of hertz. These multiplets often overlap, further complicating interpretation of the spectra and quantifications. In the present review, we discuss some of the recent developments in the pure shift 1 H NMR based methods for enantiomer resolution and enantiodiscrimination. We also compare various pure shift methods used for enantiodiscrimination and measurement of enantiomeric excess, considering the fact that conventional 1 H NMR fails to provide any detailed insight.
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Affiliation(s)
- Nilamoni Nath
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Priyakshi Bordoloi
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Bhaskar Barman
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Bikash Baishya
- Centre of Biomedical Research, SGPGIMS Campus, Lucknow, Uttar Pradesh, 226014, India
| | - Sachin R Chaudhari
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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43
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44
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Knežević A, Novak J, Pescitelli G, Vinković V. Determination of the Absolute Configuration of ( S
)- N
-(1-Aryl-allyl)-3,5-dinitrobenzamides and Their Elution Order on Brush-Type Chiral Stationary Phases. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800346] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Anamarija Knežević
- Division of Organic Chemistry and Biochemistry; Ruđer Bošković Institute; Bijenička cesta 54 Zagreb Croatia
| | - Jurica Novak
- Division of Physical Chemistry; Ruđer Bošković Institute; Bijenička cesta 54 Zagreb Croatia
| | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale; Università di Pisa; Via Moruzzi 13 Pisa Italy
| | - Vladimir Vinković
- Division of Organic Chemistry and Biochemistry; Ruđer Bošković Institute; Bijenička cesta 54 Zagreb Croatia
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45
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Kuksenok VY, Shtrykova VV, Filimonov VD, Druganov AG, Bondarev AA, Stankevich KS. The determination of enantiomer composition of 1-((3-chlorophenyl)-(phenyl)methyl) amine and 1-((3-chlorophenyl)(phenyl)-methyl) urea (Galodif) by NMR spectroscopy, chiral HPLC, and polarimetry. Chirality 2018; 30:1135-1143. [PMID: 30075486 DOI: 10.1002/chir.23005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 06/28/2018] [Accepted: 07/09/2018] [Indexed: 11/06/2022]
Abstract
For the first time, a method for enantiomer resolution of the anticonvulsant Galodif (1-((3-chlorophenyl)(phenyl)methyl) urea) by chiral HPLC was developed, whereas the enantiomeric composition of 1-((3-chlorophenyl)(phenyl)methyl) amine-precursor in Galodif synthesis-cannot be resolved by this method. However, starting 1-((3-chlorophenyl)(phenyl)methyl) amine quantitatively forms diastereomeric N-((3-chlorophenyl)(phenyl)methyl)-1-camphorsulfonamides in reaction with chiral (1R)-(+)- or (1S)-(-)-camphor-10-sulfonyl chlorides. The diastereomeric ratio of obtained camphorsulfonamides can be easily determined by NMR 1 H and 13 C spectroscopy. The DFT calculations of specific rotation of Galodif enantiomers showed good agreement with experimental data. The absolute configuration of enantiomers was proposed for the first time.
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Affiliation(s)
- Vera Yu Kuksenok
- The Kizhner Research Center, National Research Tomsk Polytechnic University, Tomsk, Russia
| | - Victoria V Shtrykova
- The Kizhner Research Center, National Research Tomsk Polytechnic University, Tomsk, Russia
| | - Victor D Filimonov
- The Kizhner Research Center, National Research Tomsk Polytechnic University, Tomsk, Russia
| | - Alexandr G Druganov
- N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | | | - Ksenia S Stankevich
- The Kizhner Research Center, National Research Tomsk Polytechnic University, Tomsk, Russia
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46
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Lankhorst PP, van Rijn JHJ, Duchateau ALL. One-Dimensional 13C NMR Is a Simple and Highly Quantitative Method for Enantiodiscrimination. Molecules 2018; 23:molecules23071785. [PMID: 30036942 PMCID: PMC6100457 DOI: 10.3390/molecules23071785] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 07/13/2018] [Accepted: 07/17/2018] [Indexed: 12/04/2022] Open
Abstract
The discrimination of enantiomers of mandelonitrile by means of 1D 13C NMR and with the aid of the chiral solvating agent (S)-(+)-1-(9-anthryl)-2,2,2-trifluoroethanol (TFAE) is presented. 1H NMR fails for this specific compound because proton signals either overlap with the signals of the chiral solvating agent or do not show separation between the (S)-enantiomer and the (R)-enantiomer. The 13C NMR method is validated by preparing artificial mixtures of the (R)-enantiomer and the racemate, and it is shown that with only 4 mg of mandelonitrile a detection limit of the minor enantiomer of 0.5% is obtained, corresponding to an enantiomeric excess value of 99%. Furthermore, the method shows high linearity, and has a small relative standard deviation of only 0.3% for the minor enantiomer when the relative abundance of this enantiomer is 20%. Therefore, the 13C NMR method is highly suitable for quantitative enantiodiscrimination. It is discussed that 13C NMR is preferred over 1H NMR in many situations, not only in molecules with more than one chiral center, resulting in complex mixtures of many stereoisomers, but also in the case of molecules with overlapping multiplets in the 1H NMR spectrum, and in the case of molecules with many quaternary carbon atoms, and therefore less abundant protons.
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Affiliation(s)
- Peter P Lankhorst
- DSM Biotechnology Center, P.O. Box 1, 2600 MA Delft, The Netherlands.
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47
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Luu QH, Lewis KG, Banerjee A, Bhuvanesh N, Gladysz JA. The robust, readily available cobalt(iii) trication [Co(NH 2CHPhCHPhNH 2) 3] 3+ is a progenitor of broadly applicable chirality and prochirality sensing agents. Chem Sci 2018; 9:5087-5099. [PMID: 29938040 PMCID: PMC5994889 DOI: 10.1039/c8sc01510d] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 05/09/2018] [Indexed: 12/16/2022] Open
Abstract
When NMR spectra of chiral racemic organic molecules containing a Lewis basic functional group are recorded in the presence of air and water stable salts of the cobalt(iii) trication [Co((S,S)-NH2CHPhCHPhNH2)3]3+ (23+), separate signals are usually observed for the enantiomers (28 diverse examples, >12 functional groups). Several chiral molecules can be simultaneously analyzed, and enantiotopic groups in prochiral molecules differentiated (16 examples). Particularly effective are the mixed bis(halide)/tetraarylborate salts Λ-23+ 2X-BArf- (X = Cl, I; BArf = B(3,5-C6H3(CF3)2)4), which are applied in CD2Cl2 or CDCl3 at 1-100 mol% (avg 34 and 14 mol%). Job plots establish 1 : 1 binding for Λ-23+ 2Cl-BArf- and 1-phenylethyl acetate (4) or 1-phenylethanol (10), and ca. 1 : 2 binding with DMSO (CD2Cl2). Selected binding constants are determined, which range from 7.60-2.73 M-1 for the enantiomers of 10 to 28.1-22.6 M-1 for the enantiomers of 4. The NH moieties of the C2 faces of the trication are believed to hydrogen bond to the Lewis basic functional groups, as seen in the crystal structure of a hexakis(DMSO) solvate of Λ-23+ 3I-. These salts rank with the most broadly applicable chirality sensing agents discovered to date.
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Affiliation(s)
- Quang H Luu
- Department of Chemistry , Texas A&M University , P.O. Box 30012 , College Station , Texas 77842-3012 , USA .
| | - Kyle G Lewis
- Department of Chemistry , Texas A&M University , P.O. Box 30012 , College Station , Texas 77842-3012 , USA .
| | - Anik Banerjee
- Department of Chemistry , Texas A&M University , P.O. Box 30012 , College Station , Texas 77842-3012 , USA .
| | - Nattamai Bhuvanesh
- Department of Chemistry , Texas A&M University , P.O. Box 30012 , College Station , Texas 77842-3012 , USA .
| | - John A Gladysz
- Department of Chemistry , Texas A&M University , P.O. Box 30012 , College Station , Texas 77842-3012 , USA .
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48
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Yang GH, Li Y, Li X. Chirality Sensing of Molecules with Diverse Functional Groups by Using N
-tert
-Butyl Sulfinyl Squaramide. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201700671] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Guo-Hui Yang
- State Key Laboratory of Elemento-Organic Chemistry; Collaborative Innovation Center of Chemical Science and Engineering; College of Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Yao Li
- State Key Laboratory of Elemento-Organic Chemistry; Collaborative Innovation Center of Chemical Science and Engineering; College of Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Xin Li
- State Key Laboratory of Elemento-Organic Chemistry; Collaborative Innovation Center of Chemical Science and Engineering; College of Chemistry; Nankai University; Tianjin 300071 P. R. China
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49
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Chen Z, Fan H, Yang S, Bian G, Song L. Chiral sensors for determining the absolute configurations of α-amino acid derivatives. Org Biomol Chem 2018; 16:8311-8317. [DOI: 10.1039/c8ob01933a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Two simple 1H NMR tests give the absolute configurations of α-amino acids.
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Affiliation(s)
- Zhongxiang Chen
- The Key Laboratory of Coal to Ethylene Glycol and its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Hongjun Fan
- The State Key Lab of Molecular Reaction Dynamics
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian
- P. R. China
| | - Shiwei Yang
- The Key Laboratory of Coal to Ethylene Glycol and its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Guangling Bian
- The Key Laboratory of Coal to Ethylene Glycol and its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
| | - Ling Song
- The Key Laboratory of Coal to Ethylene Glycol and its Related Technology
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- P. R. China
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50
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Modification of Kagan's amide for improved activity as Chiral Solvating Agent in enantiodiscrimination during NMR analysis. Tetrahedron 2018. [DOI: 10.1016/j.tet.2017.11.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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