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Nizamov IS, Yakovlev AA, Shilnikova OV, Nikitin YN, Nizamov ID, Batyeva ES, Cherkasov RA. Chiral Salts of Dithiophosphonic Acids on the Basis of Monoterpenyl Alcohols and Cinchona Alkaloids. RUSS J GEN CHEM+ 2022. [DOI: 10.1134/s1070363222120106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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2
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Balzano F, Iuliano A, Uccello-Barretta G, Zullo V. Renewable Resources for Enantiodiscrimination: Chiral Solvating Agents for NMR Spectroscopy from Isomannide and Isosorbide. J Org Chem 2022; 87:12698-12709. [PMID: 36075050 PMCID: PMC9552179 DOI: 10.1021/acs.joc.2c01244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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A new family of chiral selectors was synthesized in a
single synthetic
step with yields up to 84% starting from isomannide and isosorbide.
Mono- or disubstituted carbamate derivatives were obtained by reacting
the isohexides with electron-donating arylisocyanate (3,5-dimethylphenyl-
or 3,5-dimethoxyphenyl-) and electron-withdrawing arylisocyanate (3,5-bis(trifluoromethyl)phenyl-)
groups to test opposite electronic effects on enantiodifferentiation.
Deeper chiral pockets and derivatives with more acidic protons were
obtained by derivatization with 1-naphthylisocyanate and p-toluenesulfonylisocyanate, respectively. All compounds were
tested as chiral solvating agents (CSAs) in 1H NMR experiments
with rac-N-3,5-dinitrobenzoylphenylglycine
methyl ester in order to determine the influence of different structural
features on the enantiodiscrimination capabilities. Some selected
compounds were tested with other racemic analytes, still leading to
enantiodiscrimination. The enantiodiscrimination conditions were then
optimized for the best CSA/analyte couple. Finally, a 2D- and 1D-NMR
study was performed employing the best performing CSA with the two
enantiomers of the selected analyte, aiming to determine the enantiodiscrimination
mechanism, the stoichiometry of interaction, and the complexation
constant.
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Affiliation(s)
- Federica Balzano
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124 Pisa, Italy
| | - Anna Iuliano
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124 Pisa, Italy
| | - Gloria Uccello-Barretta
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124 Pisa, Italy
| | - Valerio Zullo
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124 Pisa, Italy
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Recchimurzo A, Maccabruni F, Uccello Barretta G, Balzano F. Quinine as a highly responsive chiral sensor for the 1H and 19F NMR enantiodiscrimination of N-trifluoroacetyl amino acids with free carboxyl functions. Analyst 2022; 147:1669-1677. [PMID: 35315472 DOI: 10.1039/d2an00166g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Hydrogen-bond accepting and enantiodiscriminating abilities of quinine (Qui) have been exploited in the enantiodiscrimination of N-trifluoroacetyl (TFA) derivatives of amino acids by nuclear magnetic resonance (NMR) spectroscopy. 1H and 19F NMR resonances of derivatives of alanine, valine, leucine, norvaline, phenylalanine, phenylglycine, methionine, glutamic acid, proline, and tryptophan were well differentiated employing CDCl3 and/or C6D6 as solvent, with Qui acting in some cases not only as enantiodiscriminating agent, but also as solubility promoter. For derivatives soluble in both solvents, the best results were obtained in benzene-d6, with very high nonequivalence values, which were detectable not only starting from very low equimolar concentrations of 0.1 mM, but also in the presence of sub-stoichiometric amounts of Qui. The quality of enantiodifferentiation has been also evaluated by means of the enantioresolution quotient E. The method has been applied to the detection and quantification of mixtures of amino acid derivatives by single point measurements.
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Affiliation(s)
- Alessandra Recchimurzo
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy.
| | - Fabio Maccabruni
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy.
| | - Gloria Uccello Barretta
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy.
| | - Federica Balzano
- Department of Chemistry and Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy.
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Lankhorst PP, Duchateau ALL, Netscher T. Discrimination of stereoisomers by one-dimensional 13 C NMR: All 16 stereoisomers of 4-hydroxy-α-tocopherol resolved. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2021; 59:1146-1153. [PMID: 34380173 DOI: 10.1002/mrc.5202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/04/2021] [Accepted: 08/08/2021] [Indexed: 06/13/2023]
Abstract
All 16 resolved! A vitamin E-derived compound containing four chiral centers is the first example where all stereoisomers, that is, eight diastereomeric pairs of enantiomers, could be discriminated in a single NMR run. Measurement at 176 MHz in the presence of Pirkle's alcohol as a chiral solvating agent is a relatively robust, simple, easy-to-set-up, and fast method.
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Affiliation(s)
| | | | - Thomas Netscher
- DSM Nutritional Products, Research and Development, Basel, Switzerland
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Recchimurzo A, Micheletti C, Uccello-Barretta G, Balzano F. A Dimeric Thiourea CSA for the Enantiodiscrimination of Amino Acid Derivatives by NMR Spectroscopy. J Org Chem 2021; 86:7381-7389. [PMID: 34019407 PMCID: PMC8279476 DOI: 10.1021/acs.joc.1c00340] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Indexed: 01/19/2023]
Abstract
The reaction of benzoyl isothiocyanate with (1R,2R)-1,2-bis(2-hydroxyphenyl)ethylenediamine afforded a new thiourea chiral solvating agent (CSA) with a very high ability to differentiate 1H and 13C NMR signals of simple amino acid derivatives, even at low concentrations. The enantiodiscrimination efficiency was higher with respect to that of the parent monomer, a thiourea derivative of 2-((1R)-1-aminoethyl)phenol, thus putting into light the relevance of the cooperativity between the two molecular portions of the dimer in a cleft conformation stabilized by interchain hydrogen bond interactions. An achiral base additive (DABCO or DMAP) played an active role in the chiral discrimination processes, mediating the interaction between the CSA and the enantiomeric mixtures. The chiral discrimination mechanism was investigated by NMR spectroscopy through the determination of complexation stoichiometries, association constants, and the stereochemistry of the diastereomeric solvates.
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Affiliation(s)
| | | | - Gloria Uccello-Barretta
- Department of Chemistry and
Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Federica Balzano
- Department of Chemistry and
Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
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Gupta R, Gonnade RG, Bedekar AV. Effect of Substituent of Roof Shape Amines on the Molecular Recognition of Optically Active Acids by NMR Spectroscopy. ChemistrySelect 2020. [DOI: 10.1002/slct.202003338] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Riddhi Gupta
- Department of Chemistry Faculty of Science The Maharaja Sayajirao University of Baroda Vadodara 390 002 India
| | - Rajesh G. Gonnade
- Center for Materials Characterization CSIR-National Chemical Laboratory Dr. Homi Bhabha Road Pune 411 008 India
| | - Ashutosh V. Bedekar
- Department of Chemistry Faculty of Science The Maharaja Sayajirao University of Baroda Vadodara 390 002 India
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Recchimurzo A, Micheletti C, Uccello-Barretta G, Balzano F. Thiourea Derivative of 2-[(1 R)-1-Aminoethyl]phenol: A Flexible Pocket-like Chiral Solvating Agent (CSA) for the Enantiodifferentiation of Amino Acid Derivatives by NMR Spectroscopy. J Org Chem 2020; 85:5342-5350. [PMID: 32191037 PMCID: PMC7997569 DOI: 10.1021/acs.joc.0c00027] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Indexed: 12/12/2022]
Abstract
Thiourea derivatives of 2-[(1R)-1-aminoethyl]phenol, (1S,2R)-1-amino-2,3-dihydro-1H-inden-2-ol, (1R,2R)-(1S,2R)-1-amino-2,3-dihydro-1H-inden-2-ol, and (R)-1-phenylethanamine have been compared as chiral solvating agents (CSAs) for the enantiodiscrimination of derivatized amino acids using nuclear magnetic resonance (NMR) spectroscopy. Thiourea derivative, prepared by reacting 2-[(1R)-1-aminoethyl]phenol with benzoyl isothiocyanate, constitutes an effective CSA for the enantiodiscrimination of N-3,5-dinitrobenzoyl (DNB) derivatives of amino acids with free or derivatized carboxyl functions. A base additive 1,4-diazabicyclo[2.2.2]octane(DABCO)/N,N-dimethylpyridin-4-amine (DMAP)/NBu4OH) is required both to solubilize amino acid derivatives with free carboxyl groups in CDCl3 and to mediate their interaction with the chiral auxiliary to attain efficient differentiation of the NMR signals of enantiomeric substrates. For ternary systems CSA/substrate/DABCO, the chiral discrimination mechanism has been ascertained through the NMR determination of complexation stoichiometry, association constants, and stereochemical features of the diastereomeric solvates.
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Affiliation(s)
- Alessandra Recchimurzo
- Department of Chemistry and
Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Cosimo Micheletti
- Department of Chemistry and
Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Gloria Uccello-Barretta
- Department of Chemistry and
Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
| | - Federica Balzano
- Department of Chemistry and
Industrial Chemistry, University of Pisa, via Moruzzi 13, 56124 Pisa, Italy
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Nizamov IS, Salikhov RZ, Nizamov ID, Yakimov VY, Sergeenko GG, Batyeva ES, Cherkasov RA. Chiral Salts of Phosphorus Dithioacids Based on Quinine. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s1070363218110105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Recent Advances in Multinuclear NMR Spectroscopy for Chiral Recognition of Organic Compounds. Molecules 2017; 22:molecules22020247. [PMID: 28178223 PMCID: PMC6155827 DOI: 10.3390/molecules22020247] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 01/26/2017] [Accepted: 01/30/2017] [Indexed: 12/17/2022] Open
Abstract
Nuclear magnetic resonance (NMR) is a powerful tool for the elucidation of chemical structure and chiral recognition. In the last decade, the number of probes, media, and experiments to analyze chiral environments has rapidly increased. The evaluation of chiral molecules and systems has become a routine task in almost all NMR laboratories, allowing for the determination of molecular connectivities and the construction of spatial relationships. Among the features that improve the chiral recognition abilities by NMR is the application of different nuclei. The simplicity of the multinuclear NMR spectra relative to 1H, the minimal influence of the experimental conditions, and the larger shift dispersion make these nuclei especially suitable for NMR analysis. Herein, the recent advances in multinuclear (19F, 31P, 13C, and 77Se) NMR spectroscopy for chiral recognition of organic compounds are presented. The review describes new chiral derivatizing agents and chiral solvating agents used for stereodiscrimination and the assignment of the absolute configuration of small organic compounds.
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Żymańczyk-Duda E, Kozyra K, Brzezińska-Rodak M, Klimek-Ochab M. Baker’s yeasts driven synthesis of enantiomers of ethyl 1-hydroxy-1-(3,4-dimethoxyphenyl)methane(P-phenyl)phosphinate – Possible organophosphorus CDA’s. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2017.01.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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