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Senboku H, Minemura Y, Suzuki Y, Matsuno H, Takakuwa M. Synthesis of N-Boc-α-amino Acids from Carbon Dioxide by Electrochemical Carboxylation of N-Boc-α-aminosulfones. J Org Chem 2021; 86:16077-16083. [PMID: 34550701 DOI: 10.1021/acs.joc.1c01516] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Electrochemical reduction of N-Boc-α-aminosulfones in DMF using an undivided cell equipped with a Pt plate cathode and an Mg rod anode under atmospheric pressure of bubbling carbon dioxide through the solution under constant current conditions resulted in a reductive C-S bond cleavage with elimination of benzenesulfinate ion generating the corresponding anion species followed by fixation of carbon dioxide to give the corresponding N-Boc-α-amino acids in moderate to good yields.
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Affiliation(s)
- Hisanori Senboku
- Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan.,Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Yoshihito Minemura
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Yuto Suzuki
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Hidetoshi Matsuno
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Mayu Takakuwa
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
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2
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3
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Enantiodiscrimination of carboxylic acids using single enantiomer thioureas as chiral solvating agents. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131141] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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4
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Pieczonka AM, Leśniak S, Rachwalski M. Chiral imines prepared from 1-(2-aminoalkyl)aziridines as novel chiral shifts reagents for efficient recognition of acids. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.02.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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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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6
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Fraschetti C, Filippi A, Crestoni ME, Marcantoni E, Glucini M, Guarcini L, Montagna M, Guidoni L, Speranza M. Contact Ion Pairs on a Protonated Azamacrocycle: the Role of the Anion Basicity. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:615-621. [PMID: 26744294 DOI: 10.1007/s13361-015-1327-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 12/14/2015] [Accepted: 12/16/2015] [Indexed: 06/05/2023]
Abstract
A potassium-containing hexaazamacrocyclic dication, [M•H•K](2+), is able to add in the gas phase mono- and dicarboxylate anions as well as inorganic anions by forming the corresponding monocharged adducts, the structure of which markedly depends on the basicity of the anion. With anions, such as acetate or fluoride, the neutral hexaazamacrocycle M acts as an acceptor of monosolvated K(+) ion. With less basic anions, such as trifluoroacetate or chloride, the protonated hexaazamacrocycle [M•H](+) performs the unusual functions of an acceptor of contact K(+)/anion pairs. Graphical Abstract ᅟ.
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Affiliation(s)
- Caterina Fraschetti
- Dipartimento di Chimica e Tecnologie del Farmaco, Università La Sapienza, Rome, Italy
| | - Antonello Filippi
- Dipartimento di Chimica e Tecnologie del Farmaco, Università La Sapienza, Rome, Italy
| | - Maria Elisa Crestoni
- Dipartimento di Chimica e Tecnologie del Farmaco, Università La Sapienza, Rome, Italy
| | - Enrico Marcantoni
- Scuola di Scienze e Tecnologie, Divisione Chimica, Università di Camerino, 62032, Camerino (MC), Italy
| | - Marco Glucini
- Scuola di Scienze e Tecnologie, Divisione Chimica, Università di Camerino, 62032, Camerino (MC), Italy
| | - Laura Guarcini
- Dipartimento di Chimica e Tecnologie del Farmaco, Università La Sapienza, Rome, Italy
| | - Maria Montagna
- Dipartimento di Chimica e Tecnologie del Farmaco, Università La Sapienza, Rome, Italy
| | - Leonardo Guidoni
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi de L'Aquila, 67100, L'Aquila, Italy
| | - Maurizio Speranza
- Dipartimento di Chimica e Tecnologie del Farmaco, Università La Sapienza, Rome, Italy.
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7
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Uccello Barretta G, Balzano F, Aiello F, Nardelli F, Ciogli A, Calcaterra A, Botta B. Covalently assembled resorcin[4]arenes and molecular tweezers: a chiral recognition rationale by NMR. Supramol Chem 2015. [DOI: 10.1080/10610278.2015.1111373] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
| | - Federica Balzano
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Federica Aiello
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Francesca Nardelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Alessia Ciogli
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma “La Sapienza”, Roma, Italy
| | - Andrea Calcaterra
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma “La Sapienza”, Roma, Italy
| | - Bruno Botta
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma “La Sapienza”, Roma, Italy
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8
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Fraschetti C, Filippi A, Crestoni ME, Marcantoni E, Glucini M, Guarcini L, Montagna M, Guidoni L, Speranza M. Protonated Hexaazamacrocycles as Selective K(+) Receptors. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2015; 26:1186-1190. [PMID: 25854782 DOI: 10.1007/s13361-015-1104-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 02/03/2015] [Accepted: 02/13/2015] [Indexed: 06/04/2023]
Abstract
Protonated hexaazamacrocycle [M•H](+) is able to detect K(+) ions present at ppb level in methanolic solutions containing 10(-5) M of Na(+) ions. The high sensitivity and selectivity of [M•H](+) for K(+) is ascribed to the favorable energy balance between the K(+) ion desolvation and its coordination to the [M•H](+) macrocycle, which allows the formation of the corresponding adduct before the Coulombic explosion of the ESI-MS nanodroplets.
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Affiliation(s)
- Caterina Fraschetti
- Dipartimento di Chimica e Tecnologia del Farmaco, Università La Sapienza, Rome, Italy
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9
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Roof shape amines: synthesis and application as NMR chiral solvating agents for discrimination of α-functionalized acids. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.05.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Application of optically active aminonaphthols as NMR solvating agents for chiral discrimination of mandelic acid. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.04.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Tanaka K, Iwashita T, Sasaki C, Takahashi H. Ring-expanded chiral rhombamine macrocycles for efficient NMR enantiodiscrimination of carboxylic acid derivatives. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.03.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Bian G, Fan H, Yang S, Yue H, Huang H, Zong H, Song L. A Chiral Bisthiourea as a Chiral Solvating Agent for Carboxylic Acids in the Presence of DMAP. J Org Chem 2013; 78:9137-42. [DOI: 10.1021/jo4013546] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guangling Bian
- The
State Key Lab of Structural Chemistry and 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
| | - Hongjun Fan
- The
State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Shiwei Yang
- The
State Key Lab of Structural Chemistry and 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
| | - Huifeng Yue
- The
State Key Lab of Structural Chemistry and 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
| | - Huayin Huang
- The
State Key Lab of Structural Chemistry and 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
| | - Hua Zong
- The
State Key Lab of Structural Chemistry and 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
| | - Ling Song
- The
State Key Lab of Structural Chemistry and 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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13
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D'Acquarica I, Calcaterra A, Sacco F, Balzano F, Aiello F, Tafi A, Pesci N, Uccello-Barretta G, Botta B. Stereochemical preference of 2'-deoxycytidine for chiral bis(diamido)-bridged basket resorcin[4]arenes. Chirality 2013; 25:840-51. [PMID: 24038320 DOI: 10.1002/chir.22224] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 06/18/2013] [Accepted: 06/19/2013] [Indexed: 11/08/2022]
Abstract
Bis(diamido)-bridged basket resorcin[4]arene (all-S)-1 and its (all-R)-1 enantiomer proved able to interact with 2'-deoxycytidine (2) and pyrimidine nucleoside analogs in dimethyl sulfoxide (DMSO) solution. In such a solvent, the resorcinarene hosts adopt a preferential 1,3-alternate-like conformation, with a larger cavity delimited by two syn 3,5-dimethoxyphenyl moieties, and two external pockets, each delimited by the other 3,5-dimethoxyphenyl group and its diamido arm (the wing). Complexation phenomena were investigated by nuclear magnetic resonance (NMR) methods, including (1)H NMR DOSY and 1D ROESY experiments, and molecular modeling. Heteroassociation constants of [(all-S)-1·2] and [(all-R)-1·2] diastereoisomeric complexes were obtained from diffusion data by single point measurements, and from nonlinear fitting of 1H NMR chemical shifts. Selective proton relaxation rate measurements allowed us to significantly discriminate the two complexes by identifying two different interaction sites of the guest in the resorcin[4]arene host, depending on its configuration.
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Affiliation(s)
- Ilaria D'Acquarica
- Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma "La Sapienza", Roma, Italy
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14
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Yang XF, Ning R, Xie LJ, Cui Y, Zhang YL, Zheng LY. Macrocyclic Compound as NMR Chiral Solvating Agent for Determination of Enantiomeric Excess of Carboxylic Acids. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2013. [DOI: 10.1246/bcsj.20130092] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Xiao-feng Yang
- School of Chemistry and Chemical Engineering, University of Jinan
| | - Rui Ning
- School of Chemistry and Chemical Engineering, University of Jinan
| | - Li-jun Xie
- School of Chemistry and Chemical Engineering, University of Jinan
| | - Yu Cui
- School of Chemistry and Chemical Engineering, University of Jinan
| | - Yong-ling Zhang
- School of Chemistry and Chemical Engineering, University of Jinan
| | - Lu-yi Zheng
- School of Chemistry and Chemical Engineering, University of Jinan
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15
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Uccello-Barretta G, Balzano F. Chiral NMR Solvating Additives for Differentiation of Enantiomers. Top Curr Chem (Cham) 2013; 341:69-131. [DOI: 10.1007/128_2013_445] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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16
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Gospodarowicz K, Hołyńska M, Paluch M, Lisowski J. Novel chiral hexaazamacrocycles for the enantiodiscrimination of carboxylic acids. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.09.093] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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17
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Ma Q, Ma M, Tian H, Ye X, Xiao H, Chen LH, Lei X. A novel amine receptor based on the binol scaffold functions as a highly effective chiral shift reagent for carboxylic acids. Org Lett 2012; 14:5813-5. [PMID: 23170807 DOI: 10.1021/ol3027686] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A "smart" receptor has been newly synthesized. NMR studies demonstrated that the receptor functions as a chiral shift reagent that is highly effective for determining the enantiomeric purity of a series of carboxylic acids, particularly those that have an α-oxygen atom.
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Affiliation(s)
- Qingzhu Ma
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China
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18
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19
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Periasamy M, Dalai M, Padmaja M. Chiral trans-1,2-diaminocyclohexane derivatives as chiral solvating agents for carboxylic acids. J CHEM SCI 2011. [DOI: 10.1007/s12039-010-0090-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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20
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Gualandi A, Grilli S, Savoia D, Kwit M, Gawroński J. C-hexaphenyl-substituted trianglamine as a chiral solvating agent for carboxylic acids. Org Biomol Chem 2011; 9:4234-41. [PMID: 21499627 DOI: 10.1039/c0ob01192d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral hexaazamacrocycles with a trianglamine structure and C(3)-symmetry, containing six ring substituents and twelve stereocenters have been tested as chiral solvating agents (CSAs) for α-substituted carboxylic acids. Excellent results have been obtained with a hexaphenyl-substituted macrocycle. The optimal ratio between the macrocycle and racemic acid, allowing for baseline separation of the enantiomers' signals in the (1)H NMR spectrum, was dependent on the type of acid, in particular on its degree of acidity. The analyte and the CSA could be separated and recovered by a simple acid-base extraction and reused without purification. The conformations of the free and protonated hexaamino macrocycles were inferred by CD spectroscopic studies and DFT calculations.
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Affiliation(s)
- Andrea Gualandi
- Dipartimento di Chimica G. Ciamician, Alma Mater Studiorum Università di Bologna, via Selmi 2, 40126, Bologna, Italy.
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21
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Tanaka K, Nakai Y, Takahashi H. Efficient NMR chiral discrimination of carboxylic acids using rhombamine macrocycles as chiral shift reagent. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.01.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Moon LS, Pal M, Kasetti Y, Bharatam PV, Jolly RS. Chiral solvating agents for cyanohydrins and carboxylic acids. J Org Chem 2010; 75:5487-98. [PMID: 20704425 DOI: 10.1021/jo100445d] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have shown that a structure as simple as an ion pair of (R)- or (S)-mandelate and dimethylamminopyridinium ions possesses structural features that are sufficient for NMR enantiodiscrimination of cyanohydrins. Moreover, (1)H NMR data of cyanohydrins of known configuration obtained in the presence of the mandelate-dimethylaminopyridinium ion pair point to the existence of a correlation between chemical shifts and absolute configuration of cyanohydrins. Mandelate-DMAPH(+) ion pair and mandelonitrile form a 1:1 complex with an association constant of 338 M(-1) (DeltaG(0), -3.4 kcal/mol) for the (R)-mandelonitrile/(R)-mandelate-DMAPH(+) and 139 M(-1) (DeltaG(0), -2.9 kcal/mol) for the (R)-mandelonitrile/(S)-mandelate-DMAPH(+) complex. To understand the origin of enantiodiscrimination, the geometry optimization and energy minimization of the models of ternary complexes of (S)-mandelonitrile/(R)-mandelate/DMAPH(+) and (S)-mandelonitrile/(S)-mandelate/DMAPH(+) complexes was performed using DFT methodology (B3LYP) with the 6-31+G(d) basis set in Gaussian 3.0. Further, analysis of optimized molecular model obtained from theoretical studies suggested that (i) DMAP may be replaced with other amines, (ii) the hydroxyl group of mandelic acid is not necessary for stabilization of ternary complex and may be replaced with other groups such as methyl, (iii) the ion pair should form a stable ternary complex with any hydrogen-bond donor, provided its OH bond is sufficiently polarized, and (iv) alpha-H of racemic mandelic acid should also get resolved with optically pure mandelonitrile. These inferences were experimentally verified, which not only validated the proposed model but also led to development of a new chiral solvating agent for determination of ee of carboxylic acids and absolute configuration of aryl but not alkyl carboxylic acids.
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Affiliation(s)
- Lomary S Moon
- Department of Chemistry, Institute of Microbial Technology (Council of Scientific and Industrial Research), Sector 39, Chandigarh 160 036, India
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23
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Busto E, González-Álvarez A, Gotor-Fernández V, Alfonso I, Gotor V. Optically active macrocyclic hexaazapyridinophanes decorated at the periphery: synthesis and applications in the NMR enantiodiscrimination of carboxylic acids. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.06.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Błażewska KM, Gajda T. Assignment of the absolute configuration of hydroxy- and aminophosphonates by NMR spectroscopy. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.05.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Huang SH, Bai ZW, Feng JW. Chiral self-discrimination of the enantiomers of alpha-phenylethylamine derivatives in proton NMR. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2009; 47:423-427. [PMID: 19224544 DOI: 10.1002/mrc.2406] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Two types of chiral analytes, the urea and amide derivatives of alpha-phenylethylamine, were prepared. The effect of inter-molecular hydrogen-bonding interaction on self-discrimination of the enantiomers of analytes has been investigated using high-resolution (1)H NMR. It was found that the urea derivatives with double-hydrogen-bonding interaction exhibit not only the stronger hydrogen-bonding interaction but also better self-recognition abilities than the amide derivatives (except for one bearing two NO(2) groups). The present results suggest that double-hydrogen-bonding interaction promotes the self-discrimination ability of the chiral compounds.
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Affiliation(s)
- Shao-Hua Huang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, the Chinese Academy of Sciences, Wuhan 430071, China
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26
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‘Calixarene-like’ chiral amine macrocycles as novel chiral shift reagents for carboxylic acids. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2008.11.018] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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27
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Shirakawa S, Moriyama A, Shimizu S. Synthesis, Optical Resolution and Enantiomeric Recognition Ability of Novel, Inherently Chiral Calix[4]arenes: Trial Application to Asymmetric Reactions as Organocatalysts. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800850] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Cycloalkane-1,2-diamine derivatives as chiral solvating agents. Study of the structural variables controlling the NMR enantiodiscrimination of chiral carboxylic acids. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.06.031] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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30
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The novel macrocyclic compounds as chiral solvating agents for determination of enantiomeric excess of carboxylic acids. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.06.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Tanaka K, Fukuda N, Fujiwara T. Trianglamine as a new chiral shift reagent for secondary alcohols. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.10.024] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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32
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New pincer-like receptor derived from trans-cyclopentane-1,2-diamine as a chiral shift reagent for carboxylic acids. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.08.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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New chiral auxiliaries derived from (S)-α-phenylethylamine as chiral solvating agents for carboxylic acids. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.03.030] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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