1
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Lidskog A, Dawaigher S, Solano Arribas C, Ryberg A, Jensen J, Bergquist KE, Sundin A, Norrby PO, Wärnmark K. Experimental and Computational Models for Side Chain Discrimination in Peptide-Protein Interactions. Chemistry 2021; 27:10883-10897. [PMID: 33908678 PMCID: PMC8362025 DOI: 10.1002/chem.202100890] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Indexed: 12/02/2022]
Abstract
A bis(18‐crown‐6) Tröger's base receptor and 4‐substituted hepta‐1,7‐diyl bisammonium salt ligands have been used as a model system to study the interactions between non‐polar side chains of peptides and an aromatic cavity of a protein. NMR titrations and NOESY/ROESY NMR spectroscopy were used to analyze the discrimination of the ligands by the receptor based on the substituent of the ligand, both quantitatively (free binding energies) and qualitatively (conformations). The analysis showed that an all‐anti conformation of the heptane chain was preferred for most of the ligands, both free and when bound to the receptor, and that for all of the receptor‐ligand complexes, the substituent was located inside or partly inside of the aromatic cavity of the receptor. We estimated the free binding energy of a methyl‐ and a phenyl group to an aromatic cavity, via CH‐π, and combined aromatic CH‐π and π‐π interactions to be −1.7 and −3.3 kJ mol−1, respectively. The experimental results were used to assess the accuracy of different computational methods, including molecular mechanics (MM) and density functional theory (DFT) methods, showing that MM was superior.
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Affiliation(s)
- Anna Lidskog
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Sami Dawaigher
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Carlos Solano Arribas
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Anna Ryberg
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Jacob Jensen
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Karl Erik Bergquist
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Anders Sundin
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Per-Ola Norrby
- Data Science & Modelling, Pharmaceutical Sciences, R&D, AstraZeneca Gothenburg, Gothenburg, Sweden
| | - Kenneth Wärnmark
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
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2
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Tahir MN, Cao Y, Azzouz A, Roy R. Host-guest chemistry of the sulfasalazine-β-cyclodextrin inclusion complex. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132052] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Tomeček J, Čablová A, Hromádková A, Novotný J, Marek R, Durník I, Kulhánek P, Prucková Z, Rouchal M, Dastychová L, Vícha R. Modes of Micromolar Host-Guest Binding of β-Cyclodextrin Complexes Revealed by NMR Spectroscopy in Salt Water. J Org Chem 2021; 86:4483-4496. [PMID: 33648337 DOI: 10.1021/acs.joc.0c02917] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Multitopic supramolecular guests with finely tuned affinities toward widely explored cucurbit[n]urils (CBs) and cyclodextrins (CDs) have been recently designed and tested as functional components of advanced supramolecular systems. We employed various spacers between the adamantane cage and a cationic moiety as a tool for tuning the binding strength toward CB7 to prepare a set of model guests with KCB7 and Kβ-CD values of (0.6-5.0) × 1010 M-1 and (0.6-2.6) × 106 M-1, respectively. These accessible adamantylphenyl-based binding motifs open a way toward supramolecular components with an outstanding affinity toward β-cyclodextrin. 1H NMR experiments performed in 30% CaCl2/D2O at 273 K along with molecular dynamics simulations allowed us to identify two arrangements of the guest@β-CD complexes. The approach, joining experimental and theoretical methods, provided a better understanding of the structure of cyclodextrin complexes and related molecular recognition, which is highly important for the rational design of drug delivery systems, molecular sensors and switches.
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Affiliation(s)
- Josef Tomeček
- Department of Chemistry, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
| | - Andrea Čablová
- Department of Chemistry, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
| | - Aneta Hromádková
- Department of Chemistry, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
| | - Jan Novotný
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.,Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Radek Marek
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.,Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Ivo Durník
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Petr Kulhánek
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Zdeňka Prucková
- Department of Chemistry, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
| | - Michal Rouchal
- Department of Chemistry, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
| | - Lenka Dastychová
- Department of Chemistry, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
| | - Robert Vícha
- Department of Chemistry, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
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4
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Matador E, Iglesias-Sigüenza J, Monge D, Merino P, Fernández R, Lassaletta JM. Enantio- and Diastereoselective Nucleophilic Addition of N-tert-Butylhydrazones to Isoquinolinium Ions through Anion-Binding Catalysis. Angew Chem Int Ed Engl 2021; 60:5096-5101. [PMID: 33045143 DOI: 10.1002/anie.202012861] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Indexed: 12/13/2022]
Abstract
A highly enantio- and diastereoselective thiourea-catalyzed dearomatization of isoquinolines employing N-tert-butylhydrazones as neutral α-azo carbanions and masked acyl anion equivalents has been developed. Experimental and computational data supports the generation of highly ordered complexes wherein the chloride behaves as a template for the catalyst, the hydrazone reagent, and the isoquinolinium cation, providing excellent stereocontrol in the formation of two contiguous stereogenic centers. The ensuing selective and high-yielding transformations provide appealing dihydroisoquinoline derivatives.
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Affiliation(s)
- Esteban Matador
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González 1, 41012, Sevilla, Spain
| | - Javier Iglesias-Sigüenza
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González 1, 41012, Sevilla, Spain
| | - David Monge
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González 1, 41012, Sevilla, Spain
| | - Pedro Merino
- Instituto de BiocomputaciónyFísica de Sistemas Complejos (BIFI), Universidad de Zaragoza-CSIC, 50009, Zaragoza, Spain
| | - Rosario Fernández
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Prof. García González 1, 41012, Sevilla, Spain
| | - José M Lassaletta
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA), C/ Américo Vespucio 49, 41092, Sevilla, Spain
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5
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Matador E, Iglesias‐Sigüenza J, Monge D, Merino P, Fernández R, Lassaletta JM. Enantio‐ and Diastereoselective Nucleophilic Addition of
N
‐
tert
‐Butylhydrazones to Isoquinolinium Ions through Anion‐Binding Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202012861] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Esteban Matador
- Departamento de Química Orgánica Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/ Prof. García González 1 41012 Sevilla Spain
| | - Javier Iglesias‐Sigüenza
- Departamento de Química Orgánica Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/ Prof. García González 1 41012 Sevilla Spain
| | - David Monge
- Departamento de Química Orgánica Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/ Prof. García González 1 41012 Sevilla Spain
| | - Pedro Merino
- Instituto de BiocomputaciónyFísica de Sistemas Complejos (BIFI) Universidad de Zaragoza-CSIC 50009 Zaragoza Spain
| | - Rosario Fernández
- Departamento de Química Orgánica Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/ Prof. García González 1 41012 Sevilla Spain
| | - José M. Lassaletta
- Instituto de Investigaciones Químicas (CSIC-US) and Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/ Américo Vespucio 49 41092 Sevilla Spain
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6
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Cyclodextrins as inhibitors of the precipitation of riboflavin-5'-phosphate due to presence of zinc chloride: A NMR investigation. J Pharm Biomed Anal 2016; 144:183-187. [PMID: 28081895 DOI: 10.1016/j.jpba.2016.12.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 12/20/2016] [Accepted: 12/29/2016] [Indexed: 02/08/2023]
Abstract
Several cyclodextrins (CDs) were probed in order to counteract the precipitation of riboflavin-5'-phosphate (or flavin mononucleotide, FMN-P) due to the presence of divalent cations, by exploiting Nuclear Magnetic Resonance (NMR) spectroscopy both for quantitative analyses and stereochemical characterizations. Among CDs, β-cyclodextrin (β-CD) showed the best solubilizing power in virtue of the formation of a 1-2 FMN-P/β-CD complex, the stereochemistry of which was ascertained by ROESY (Rotating-frame Overhauser Enhanced SpectroscopY) measurements.
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7
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Renzetti A, Marrone A, Gérard S, Sapi J, Nakazawa H, Re N, Fontana A. TiCl4-promoted condensation of methyl acetoacetate, isobutyraldehyde, and indole: a theoretical and experimental study. Phys Chem Chem Phys 2015; 17:8964-72. [DOI: 10.1039/c4cp05412a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A combined DFT and experimental study of the title reaction points to a three-step mechanism: (1) titanium enolate formation, (2) Knoevenagel condensation of enolate and aldehyde, and (3) Michael addition of indole.
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Affiliation(s)
- Andrea Renzetti
- Department of Chemistry
- Osaka City University
- 558-8585 Osaka
- Japan
| | - Alessandro Marrone
- Dipartimento di Farmacia
- Università “G. d'Annunzio” di Chieti-Pescara
- I-66100 Chieti
- Italy
| | - Stéphane Gérard
- Institut de Chimie Moléculaire de Reims
- UMR CNRS 7312
- Université de Reims Champagne-Ardenne
- Faculté de Pharmacie
- F-51096 Reims
| | - Janos Sapi
- Institut de Chimie Moléculaire de Reims
- UMR CNRS 7312
- Université de Reims Champagne-Ardenne
- Faculté de Pharmacie
- F-51096 Reims
| | | | - Nazzareno Re
- Dipartimento di Farmacia
- Università “G. d'Annunzio” di Chieti-Pescara
- I-66100 Chieti
- Italy
| | - Antonella Fontana
- Dipartimento di Farmacia
- Università “G. d'Annunzio” di Chieti-Pescara
- I-66100 Chieti
- Italy
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8
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Tamami M, Hemp ST, Zhang K, Zhang M, Moore RB, Long TE. Poly(ethylene glycol)-based ammonium ionenes containing nucleobases. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.01.040] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Marrone A, Renzetti A, De Maria P, Gérard S, Sapi J, Fontana A, Re N. Condensation of beta-diester titanium enolates with carbonyl substrates: a combined DFT and experimental investigation. Chemistry 2010; 15:11537-50. [PMID: 19777518 DOI: 10.1002/chem.200901595] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The condensation of dialkyl beta-diesters with various aldehydes promoted by TiCl4 has been studied by DFT approaches and experimental methods, including NMR, IR and UV/Vis spectroscopy. Various possible reaction pathways have been investigated and their energy profiles evaluated to find out a plausible mechanism of the reaction. Theoretical results and experimental evidence point to a three-step mechanism: 1) Ti-induced formation of the enolate ion; 2) aldol reaction between the enolate ion and the aldehyde, both coordinated to titanium; and 3) intramolecular elimination that leads to a titanyl complex. The presented mechanistic hypothesis allows one to better understand the pivotal role of titanium(IV) in the reaction.
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Affiliation(s)
- Alessandro Marrone
- Dipartimento di Scienze del Farmaco, Università degli Studi G. d'Annunzio di Chieti-Pescara, Via dei Vestini, 66100 Chieti, Italy
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10
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O'Farrell CM, Hagan KA, Wenzel TJ. Water-soluble calix[4]resorcinarenes as chiral NMR solvating agents for bicyclic aromatic compounds. Chirality 2009; 21:911-21. [DOI: 10.1002/chir.20688] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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11
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Provencher KA, Weber MA, Randall LA, Cunningham PR, Dignam CF, Wenzel TJ. Carboxymethylated cyclodextrins and their complexes with Pr(III) and Yb(III) as water-soluble chiral NMR solvating agents for cationic compounds. Chirality 2009; 22:336-46. [DOI: 10.1002/chir.20748] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Gasa T, Spruell J, Dichtel W, Sørensen T, Philp D, Stoddart J, Kuzmič P. Complexation between Methyl Viologen (Paraquat) Bis(Hexafluorophosphate) and Dibenzo[24]Crown-8 Revisited. Chemistry 2009; 15:106-16. [DOI: 10.1002/chem.200801827] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Water-soluble calix[4]resorcinarenes as chiral NMR solvating agents for phenyl-containing compounds. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.07.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Wahl A, Al-Rimawi F, Schnell I, Kornysova O, Maruska A, Pyell U. Synthesis of a polyrotaxane-based macroporous polymer as stationary phase for capillary electrochromatographyviahost–guest complexation ofN,N ′-ethylenedianilinediacrylamide with statistically methylated β-cyclodextrin. J Sep Sci 2008; 31:1519-28. [DOI: 10.1002/jssc.200700632] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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O'Farrell CM, Chudomel JM, Collins JM, Dignam CF, Wenzel TJ. Water-Soluble Calix[4]resorcinarenes with Hydroxyproline Groups as Chiral NMR Solvating Agents. J Org Chem 2008; 73:2843-51. [DOI: 10.1021/jo702751z] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Jan M. Collins
- Department of Chemistry, Bates College, Lewiston, Maine 04240
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16
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Powell E, Lee YH, Partch R, Dennis D, Morey T, Varshney M. Pi-Pi complexation of bupivacaine and analogues with aromatic receptors: implications for overdose remediation. Int J Nanomedicine 2007; 2:449-59. [PMID: 18019843 PMCID: PMC2676660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The interaction of the important but often overdosed local anesthetic bupivacaine, its structural analogs 2,6-dimethylaniline, and N-methyl-2,6-dimethylacetanilide, and cocaine, with several electron deficient aromatic moieties were studied primarily by proton NMR and UV-visible spectroscopy. In solution, the anesthetic, its analogs and cocaine are electron donors and form pi-pi charge transfer complexes with strong aromatic acceptors, as monitored by the upfield changes induced in the NMR chemical shifts (delta) and red-shifted UV-vis wavelength (lamda max) absorbance of the acceptors. The equilibrium binding constant, K, was determined from the 1H NMR charge transfer induced chemical shift changes and used to calculate the free energy (deltaG) for complex formation of three acceptor-donor pairs. HPLC results indicate that the concentrations of free bupivacaine, its analogs and of cocaine are reduced from solution via binding to aromatic-functionalized silica.
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Affiliation(s)
- Evon Powell
- Department of Chemistry, Clarkson University, Potsdam, NY, USA
| | - Y-H Lee
- Department of Chemistry, Kyungwon University, Seoul, Korea
| | - Richard Partch
- Department of Chemistry, Clarkson University, Potsdam, NY, USA
| | - Donn Dennis
- Department of Anesthesiology, University of Florida, Gainesville, FL, USA
| | - Timothy Morey
- Department of Anesthesiology, University of Florida, Gainesville, FL, USA
| | - Manoj Varshney
- Department of Anesthesiology, University of Florida, Gainesville, FL, USA
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17
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Lovely AE, Wenzel TJ. Chiral NMR discrimination of pyrrolidines using (18-crown-6)-2,3,11,12-tetracarboxylic acid. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.10.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Dignam CF, Randall LA, Blacken RD, Cunningham PR, Lester SKG, Brown MJ, French SC, Aniagyei SE, Wenzel TJ. Carboxymethylated cyclodextrin derivatives as chiral NMR discriminating agents. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.04.006] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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19
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Dignam CF, Zopf JJ, Richards CJ, Wenzel TJ. Water-Soluble Calix[4]resorcarenes as Enantioselective NMR Shift Reagents for Aromatic Compounds. J Org Chem 2005; 70:8071-8. [PMID: 16277329 DOI: 10.1021/jo051267p] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A tetra L-prolinylmethyl derivative of a tetra-sulfonated calix[4]resorcarene (1) is an effective chiral NMR solvating agent for water-soluble compounds with phenyl, pyridyl, bicyclic aromatic, or indole rings. These aromatic compounds form host-guest complexes with the calix[4]resorcarene in water. Complexation of substrates with the calix[4]resorcarene is likely promoted by hydrophobic effects, and bicyclic substrates have association constants with the calix[4]resorcarene larger than those of similar phenyl-containing compounds. Aromatic resonances of the substrates show substantial upfield shifts because of shielding from the aromatic rings of the calix[4]resorcarene, and several resonances in the 1H NMR spectra typically exhibit enantiomeric discrimination. The extent of enantiomeric discrimination depends in part on interactions of the substituent groups of the substrates with the prolinylmethyl groups of the calix[4]resorcarene. The effectiveness of a calix[4]resorcarene prepared from N-methyl-L-alanine (2) as a chiral NMR discriminating agent is compared to the L-prolinylmethyl derivative.
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20
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Dignam CF, Richards CJ, Zopf JJ, Wacker LS, Wenzel TJ. An Enantioselective NMR Shift Reagent for Cationic Aromatics. Org Lett 2005; 7:1773-6. [PMID: 15844903 DOI: 10.1021/ol050355t] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[structure: see text] The water-soluble tetra l-prolinylmethyl derivative of a tetrasulfonated calix[4]resorcarene is an effective chiral NMR solvating agent for compounds with bicyclic aromatic or indole rings. Complexation of bicyclic substrates with the calix[4]resorcarene is likely promoted by hydrophobic effects. The bicyclic substrates have larger association constants with the calix[4]resorcarene than similar phenyl-containing compounds. Substantial enantiomeric discrimination is observed for several resonances in the (1)H NMR spectra of these substrates.
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21
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Disch JS, Staples RJ, Concolino TE, Haas TE, Rybak-Akimova EV. Nickel(II) Cyclidenes with Appended Ethylpyridine Receptor Centers as Molecular Tweezers for Dicarboxylic Acids. Inorg Chem 2003; 42:6749-63. [PMID: 14552627 DOI: 10.1021/ic0345572] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of 14-, 15-, and 16-membered nickel(II) cyclidene macrocycles appended with 2-aminoethyl(2-pyridine) receptors I-III, respectively, were prepared and characterized by X-ray crystallography and NMR techniques. The 14- and 15-membered macrocycles I and II exist in a planar or extended Z-configuration, whereas the 16-membered macrocycle III was saddle shaped and had two asymmetric configurations in the unit cell (IIIa in a "capped" configuration and IIIb in an "open" configuration). Variable-temperature (1)H NMR studies of III in CD(3)CN were conducted (25-65 degrees C), and at room temperature, the interconversion between capping and uncapping is slow on the NMR time scale, resulting in a broad spectrum, whereas at 65 degrees C, interconversion was fast. (1)H NMR binding studies indicated I-III bind unsaturated dicarboxylic acids in a 1:1 stoichiometry with binding constants approaching 400 M(-)(1) in CD(3)CN, and the binding strength was dependent on the shape of the macrocyclic cyclidene platforms, whereas monocarboxylic acids were not bound. Generally, the planar 14-membered cyclidene I bound diacids the weakest and the 16-membered cyclidene III bound diacids the strongest. The presence of nuclear Overhauser effect spectrometry cross peaks in a 20 mM solution of 1:1 II-maleic acid indicates that the binding mode is ditopic with the guest being encapsulated by the aminoethylpyridine arms above the macrocyclic framework.
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Affiliation(s)
- Jeremy S Disch
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155, USA
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22
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Lezcano M, Novo M, Al-Soufi W, Rodríguez-Núñez E, Tato JV. Complexation of several fungicides with beta-cyclodextrin: determination of the association constants and isolation of the solid complexes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2003; 51:5036-5040. [PMID: 12903966 DOI: 10.1021/jf0343682] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The formation of inclusion complexes with beta-cyclodextrin was studied for several popular fungicides of different types: prochloraz, 2-phenylphenol, thiophanate methyl, 8-hydroxyquinoline, and benalaxyl. Phase solubility diagrams showed that in all cases complexation takes place, leading to an important increase of water solubility in prochloraz and benalaxyl. Equilibrium association constants could be determined from the phase solubility data and from NMR titrations in the case of 2-phenylphenol. Because of the low solubility of the complex formed between 8-hydroxyquinoline and beta-cyclodextrin, the corresponding association constant could not be determined. The solid complexes of fungicide-cyclodextrin were prepared and isolated by different methods. The isolation of real complexes and not physical mixtures was confirmed in the cases of prochloraz, 2-phenylphenol, and benalaxyl by differential scanning calorimetry.
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Affiliation(s)
- Minerva Lezcano
- Departamentos de Química Física y Física Aplicada, Facultade de Ciencias, Universidade de Santiago de Compostela, E-27002 Lugo, Spain
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Kryatova OP, Kolchinski AG, Rybak-Akimova EV. Metal-containing ditopic receptors for molecular recognition of diammonium cations. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(02)01482-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Lezcano M, Al-Soufi W, Novo M, Rodríguez-Núñez E, Tato JV. Complexation of several benzimidazole-type fungicides with alpha- and beta-cyclodextrins. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2002; 50:108-112. [PMID: 11754552 DOI: 10.1021/jf010927y] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The potential increase in water solubility of three benzimidazole-type fungicides (thiabendazole, carbendazim, and fuberidazole) due to complexation with alpha- and beta-cyclodextrins was investigated. Fluorescence emission spectra of the fungicides in the presence of different concentrations of the cyclodextrins were measured. Analysis of these spectra by the method of principal components global analysis (PCGA) yielded precise values for the association constants and the emission spectra of the fungicide-cyclodextrin inclusion complexes. Phase-solubility diagrams confirmed the formation of inclusion complexes between each of the fungicides and beta-cyclodextrin and showed significant increases of their solubilities due to complexation.
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Affiliation(s)
- Minerva Lezcano
- Departamentos de Química Física y Física Aplicada, Facultade de Ciencias, Universidade de Santiago de Compostela, E-27002 Lugo, Spain
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25
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Gaboyard M, Hervaud Y, Boutevin B. Photoinitiated alternating copolymerization of vinyl ethers with chlorotrifluoroethylene. POLYM INT 2002. [DOI: 10.1002/pi.902] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Kawaguchi M, Ikeda A, Shinkai S. A novel porphyrin–homooxacalix[3]arene conjugate which creates a C3-symmetrical capsular space. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00463-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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28
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Cohen JI, Castro S, Han JA, Behaj V, Engel R. Polycations. IX. Polyammonium derivatives of cyclodextrins: syntheses and binding to organic oxyanions. HETEROATOM CHEMISTRY 2000. [DOI: 10.1002/1098-1071(2000)11:7<546::aid-hc14>3.0.co;2-r] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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29
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Zhong Z, Ikeda A, Shinkai S. Triple Linkage of Two Homooxacalix[3]arenes Creates Capsular Molecules and Self-Threaded Rotaxanes. J Am Chem Soc 1999. [DOI: 10.1021/ja9925002] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhenlin Zhong
- Department of Chemistry and Biochemistry Graduate School of Engineering, Kyushu University Fukuoka 812-8581, Japan
| | - Atsushi Ikeda
- Department of Chemistry and Biochemistry Graduate School of Engineering, Kyushu University Fukuoka 812-8581, Japan
| | - Seiji Shinkai
- Department of Chemistry and Biochemistry Graduate School of Engineering, Kyushu University Fukuoka 812-8581, Japan
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Sahai R, Singh V, Verma R. Differential Refractometric Studies on Some Strong and Weak Molecular Complexes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1980. [DOI: 10.1246/bcsj.53.2995] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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31
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Sahai R, Singh V. Determination of Stoichiometry and Formation Constant of Molecular Complexes by Differential Refractometry. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1980. [DOI: 10.1246/bcsj.53.1785] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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