1
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Sehgal V, Pandey SP, Singh PK. Prospects of charged cyclodextrins in biomedical applications. Carbohydr Polym 2024; 323:121348. [PMID: 37940240 DOI: 10.1016/j.carbpol.2023.121348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 08/26/2023] [Accepted: 08/28/2023] [Indexed: 11/10/2023]
Abstract
Cyclodextrins (CDs), recognized for their unique ability to form inclusion complexes, have seen broad utilization across various scientific fields. Recently, there has been a surge of interest in the use of charged cyclodextrins for biomedical applications, owing to their enhanced properties, such as superior solubility and improved molecular recognition compared to neutral CDs. Despite the growing literature, a comprehensive review of the biomedical utilisations of multi-charged cyclodextrins is scarce. This review provides a comprehensive exploration of the emerging prospects of charged cyclodextrin-based assemblies in the field of biomedical applications. Focusing on drug delivery systems, the review details how charged CDs enhance drug solubility and stability, reduce toxicity, and enable targeted and controlled drug release. Furthermore, the review highlights the role of charged CDs in gene therapy, notably their potential for DNA/RNA binding, cellular uptake, degradation protection, and targeted gene delivery. The promising potential of charged CDs in antibacterial and antiviral therapies, including photodynamic therapies, biofilm control, and viral replication inhibition, is discussed. Concluding with a future outlook, this review highlights the potential challenges and advancements that could propel charged CDs to the forefront of biomedicine.
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Affiliation(s)
- Vidhi Sehgal
- Department of Biotechnology, Mithibai College of Arts, Chauhan Institute of Science & Amrutben Jivanlal College of Commerce and Economics, Vile Parle (W), 400 056, India
| | - Shrishti P Pandey
- Department of Biotechnology, Mithibai College of Arts, Chauhan Institute of Science & Amrutben Jivanlal College of Commerce and Economics, Vile Parle (W), 400 056, India
| | - Prabhat K Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400085, India.
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2
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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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3
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Raval HB, Bedekar AV. Synthesis And Study of Fluorine Containing Kagan's Amides as Chiral Solvating Agents For Enantiodiscrimination of Acids by NMR Spectroscopy. ChemistrySelect 2020. [DOI: 10.1002/slct.202000779] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Hiten B. Raval
- Department of Chemistry Faculty of Science, The MaharajaSayajirao University of Baroda Vadodara 390 002 India
| | - Ashutosh V. Bedekar
- Department of Chemistry Faculty of Science, The MaharajaSayajirao University of Baroda Vadodara 390 002 India
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4
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Dalvano BE, Wenzel TJ. Sulfated cyclodextrins as water-soluble chiral NMR solvating agents for cationic compounds. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.tetasy.2017.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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5
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Puentes CM, Wenzel TJ. Phosphated cyclodextrins as water-soluble chiral NMR solvating agents for cationic compounds. Beilstein J Org Chem 2017; 13:43-53. [PMID: 28179947 PMCID: PMC5238554 DOI: 10.3762/bjoc.13.6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 12/22/2016] [Indexed: 11/27/2022] Open
Abstract
The utility of phosphated α-, β- and γ-cyclodextrins as water-soluble chiral NMR solvating agents for cationic substrates is described. Two sets of phosphated cyclodextrins, one with degrees of substitution in the 2–6 range, the other with degrees of substitution in the 6–10 range, are examined. Results with 33 water-soluble cationic substrates are reported. We also explored the possibility that the addition of paramagnetic lanthanide ions such as praseodymium(III) and ytterbium(III) further enhances the enantiomeric differentiation in the NMR spectra. The chiral differentiation with the phosphated cyclodextrins is compared to prior results obtained with anionic carboxymethylated cyclodextrins. There are a number of examples where a larger differentiation is observed with the phosphated cyclodextrins.
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Affiliation(s)
| | - Thomas J Wenzel
- Department of Chemistry, Bates College, Lewiston, Maine 04240 USA
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6
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Gupta R, Gonnade RG, Bedekar AV. Application of Roof-Shape Amines as Chiral Solvating Agents for Discrimination of Optically Active Acids by NMR Spectroscopy: Study of Match–Mismatch Effect and Crystal Structure of the Diastereomeric Salts. J Org Chem 2016; 81:7384-92. [DOI: 10.1021/acs.joc.6b00935] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Riddhi Gupta
- Department
of Chemistry, Faculty of Science, M.S. 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, M.S. University of Baroda, Vadodara 390 002, India
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7
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Dowey AE, Puentes CM, Carey-Hatch M, Sandridge KL, Krishna NB, Wenzel TJ. Synthesis and Utilization of Trialkylammonium-Substituted Cyclodextrins as Water-Soluble Chiral NMR Solvating Agents for Anionic Compounds. Chirality 2016; 28:299-305. [DOI: 10.1002/chir.22582] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 01/04/2016] [Accepted: 01/08/2016] [Indexed: 11/10/2022]
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8
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Gao G, Lv C, Li Q, Ai L, Zhang J. Enantiomeric discrimination of α-hydroxy acids and N -Ts-α-amino acids by 1 H NMR spectroscopy. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.10.060] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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9
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Synthesis and applications of exo N-((1R,2R,4R)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-yl)benzamides as NMR solvating agents for the chiral discrimination of 1,1′-binaphthyl-2,2′-diyl hydrogenphosphates and α-substituted acids. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.08.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Mavridis IM, Yannakopoulou K. Anionic cyclodextrins as versatile hosts for pharmaceutical nanotechnology: Synthesis, drug delivery, enantioselectivity, contrast agents for MRI. Int J Pharm 2015; 492:275-90. [DOI: 10.1016/j.ijpharm.2015.06.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 06/03/2015] [Accepted: 06/04/2015] [Indexed: 12/30/2022]
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11
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Jain N, Patel RB, Bedekar AV. Modified Kagan's amide: synthesis and application as a chiral solvating agent for hydrogen-bonding based chiral discrimination in NMR. RSC Adv 2015. [DOI: 10.1039/c5ra06959a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
A modified Kagan's amide, N-((S)-1-(3,5-bis(trifluoromethyl)phenyl)ethyl)-3,5-dinitrobenzamide has been designed, synthesized and screened as a Chiral Solvating Agent for discrimination of optically active substrates.
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Affiliation(s)
- Nilesh Jain
- Department of Chemistry
- Faculty of Science
- M. S. University of Baroda
- Vadodara 390 002
- India
| | - Ravi B. Patel
- Department of Chemistry
- Faculty of Science
- M. S. University of Baroda
- Vadodara 390 002
- India
| | - Ashutosh V. Bedekar
- Department of Chemistry
- Faculty of Science
- M. S. University of Baroda
- Vadodara 390 002
- India
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12
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Enantiodifferentiation of multifunctional tertiary alcohols by NMR spectroscopy with a Whelk-O type chiral solvating agent. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2013.11.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Guo S, Wang G, Ai L. Synthesis of macrocycles and their application as chiral solvating agents in the enantiomeric recognition of carboxylic acids and α-amino acid derivatives. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.03.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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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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15
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Chiral Derivatizing Agents, Macrocycles, Metal Complexes, and Liquid Crystals for Enantiomer Differentiation in NMR Spectroscopy. Top Curr Chem (Cham) 2013; 341:1-68. [DOI: 10.1007/128_2013_433] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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16
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Pham NH, Wenzel TJ. A water-soluble calix[4]resorcinarene with L-pipecolinic acid groups as a chiral NMR solvating agent. Chirality 2012; 24:193-200. [DOI: 10.1002/chir.21979] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Accepted: 10/19/2011] [Indexed: 11/09/2022]
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17
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Imidazolinium sulfonate and sulfamate zwitterions as chiral solvating agents for enantiomeric excess calculations. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.09.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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18
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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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19
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Wenzel TJ, Chisholm CD. Using NMR spectroscopic methods to determine enantiomeric purity and assign absolute stereochemistry. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2011; 59:1-63. [PMID: 21600355 DOI: 10.1016/j.pnmrs.2010.07.003] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 07/28/2010] [Indexed: 05/30/2023]
Affiliation(s)
- Thomas J Wenzel
- Department of Chemistry, Bates College, Lewiston, Maine 04240, USA.
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20
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Pham NH, Wenzel TJ. A sulfonated calix[4]resorcinarene with l-pipecolinic acid groups as a water-soluble chiral NMR solvating agent. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.08.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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21
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Pham NH, Wenzel TJ. A sulfonated calix[4]resorcinarene with α-methyl-l-prolinylmethyl groups as a water-soluble chiral NMR solvating agent. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.04.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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22
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Iwaniuk DP, Wolf C. A versatile and practical solvating agent for enantioselective recognition and NMR analysis of protected amines. J Org Chem 2011; 75:6724-7. [PMID: 20822120 DOI: 10.1021/jo101426a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The 3,5-dinitrobenzoyl-derived 1-naphthylethyl amide 3 is an attractive CSA for NMR analysis of protected amines. It is readily prepared in a single step and combines practical resolution of diastereomeric complexes due to signal sharpness and effective signal separation. Crystallographic analysis shows that 3 forms a chiral cleft that can selectively bind one enantiomer of a substrate through hydrogen bonding, π-π stacking, and CH/π interactions. The enantioselective complex formation causes strong upfield shifts in the (1)H NMR spectrum even in the presence of only 5 mol % of 3.
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Affiliation(s)
- Daniel P Iwaniuk
- Department of Chemistry, Georgetown University, Washington, D C 20057, USA
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23
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Enantiomeric discrimination of aromatic-containing anionic substrates using cationic cyclodextrins. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2010.12.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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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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25
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Maffeo D, Lampropoulou M, Fardis M, Lazarou YG, Mavridis IM, Mavridou DAI, Urso E, Pratsinis H, Kletsas D, Yannakopoulou K. Novel polycarboxylated EDTA-type cyclodextrins as ligands for lanthanide binding: study of their luminescence, relaxivity properties of Gd(iii) complexes, and PM3 theoretical calculations. Org Biomol Chem 2010; 8:1910-21. [DOI: 10.1039/b924980j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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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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27
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Hagan KA, O'Farrell CM, Wenzel TJ. Water-Soluble Calix[4]resorcinarenes with Hydroxyproline Groups as Chiral NMR Solvating Agents for Phenyl- and Pyridyl-Containing Compounds. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900674] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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28
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Sun P, Macdonnell FM, Armstrong DW. Enantioselective Host-Guest Complexation of Ru(II) trisdiimine complexes using neutral and anionic derivatized cyclodextrins. Inorganica Chim Acta 2009; 362:3073-3078. [PMID: 20161587 DOI: 10.1016/j.ica.2009.02.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Enantioselective host-guest complexation between five racemic Ru(II) trisdiimine complexes and eight derivatized cyclodextrins (CDs) has been examined by NMR techniques. The appearance of non-equivalent complexation-induced shifts of between the Δ and Λ-enantionomers of the Ru(II) trisdiimine complexes and derivatized CDs is readily observed by NMR. In particular, sulfobutyl ether-β-cyclodextrin sodium salt (SBE-β-CD), R-naphtylethyl carbamate β-cyclodextrin (RN-β-CD), and S-naphtylethyl carbamate β-cyclodextrin (SN-β-CD) showed good enantiodiscrimination for all five Ru complexes examined, which indicates that aromatic and anionic derivatizing groups are beneficial for chiral recognition. The complexation stoichiometry between SBE-β-CD and [Ru(phen)(3)](2+) was found to be 1: 1 and binding constants reveal that Λ-[Ru(phen)(3)](2+) binds more strongly to SBE-β-CD than the Δ-enantiomer. Correlations between this NMR method and separative techniques based on CDs as chiral discriminating agents (i.e., selectors) are discussed in detail.
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Affiliation(s)
- Ping Sun
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, TX 76019, USA
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29
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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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30
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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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31
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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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32
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Provencher KA, Wenzel TJ. Carboxymethylated cyclodextrins and their paramagnetic lanthanide complexes as water-soluble chiral NMR solvating agents. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.07.024] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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33
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Malavašič Č, Wagger J, Stanovnik B, Svete J. (S)-N-Benzyl-3(6)-methylpiperazine-2,5-diones as chiral solvating agents for N-acylamino acid esters. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.06.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Synthesis and biological properties of tensyuic acids B, C, and E, and investigation of the optical purity of natural tensyuic acid B. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.05.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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35
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Kaik M, Gajewy J, Grajewski J, Gawronski J. Discrimination of enantiomers of alpha-amino acids by chiral derivatizing reagents from trans-1,2-diaminocyclohexane. Chirality 2008; 20:301-6. [PMID: 17600850 DOI: 10.1002/chir.20435] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
New chiral derivatizing reagents (CDAs) derived from trans-1,2-diaminocyclohexane, having an electron-deficient aromatic substituent (either an aromatic imide or 3,5-dinitrobenzamide) and rigid structure (either an amide or a urea linker), are reported. Significant shift differences of diastereotopic protons in the 1H NMR signals are observed for enantiomers of suitably protected alpha-amino acids, linked to CDA by a covalent bond. A simple, general model rationalizing the observed enantiomer discrimination and based on semiempirical conformational search is presented.
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Affiliation(s)
- Magdalena Kaik
- Department of Chemistry, A Mickiewicz University, 60780 Poznan, Poland
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36
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Pham DT, Clements P, Easton CJ, Lincoln SF. 1H NMR studies of enantioselective host–guest complexation by modified β-cyclodextrins and their europium(III) complexes. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2007.12.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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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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38
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Ema T, Tanida D, Sakai T. Versatile and Practical Macrocyclic Reagent with Multiple Hydrogen-Bonding Sites for Chiral Discrimination in NMR. J Am Chem Soc 2007; 129:10591-6. [PMID: 17676846 DOI: 10.1021/ja073476s] [Citation(s) in RCA: 147] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bifunctional macrocycles 1-4 and diamide 5 were designed and synthesized. NMR studies demonstrated that, among them, receptor 1 functions as the best chiral solvating agent (shift reagent), which is effective for a wide range of chiral compounds having a carboxylic acid, oxazolidinone, carbonate, lactone, alcohol, sulfoxide, sulfoximine, sulfinamide, isocyanate, or epoxide functionality. The addition of only 5 mol % (69 microg, 0.15 mM) of 1 splits the enantiomeric signals of sulfoxide 13. The excellent performance of 1 as a chiral solvating agent, such as versatility, signal sharpness, high splitting ability, high sensitivity, wide detection window, and synthetic accessibility, is reported. NMR studies revealed that the principal binding site of 1 is the two amide NH groups of the lower segment and that the additional binding site is the pyridyl nitrogen. The V-shaped arrangement of the two 2,6-diacylaminopyridine moieties as constructed in 1 was found to be much more effective for binding a variety of compounds than the parallel alignment of the two binding motifs as constructed in 4. The NO2 group in 1 enhanced not only the binding ability but also the degree of enantioselectivity. Unexpectedly, the comparisons between 1 and 3 enabled us to find the importance of the relative orientation of the binaphthyl moiety; the orthogonal disposition of the binaphthyl moiety in 1 most effectively brings about the differential ring-current effect on the chiral guest molecule bound, which leads to the high degree of chiral discrimination in NMR.
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Affiliation(s)
- Tadashi Ema
- Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama 700-8530, Japan.
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39
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Wagger J, Grdadolnik SG, Grošelj U, Meden A, Stanovnik B, Svete J. Chiral solvating properties of (S)-1-benzyl-6-methylpiperazine-2,5-dione. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.02.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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40
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Ema T, Tanida D, Sakai T. Versatile and Practical Chiral Shift Reagent with Hydrogen-Bond Donor/Acceptor Sites in a Macrocyclic Cavity. Org Lett 2006; 8:3773-5. [PMID: 16898814 DOI: 10.1021/ol0613665] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[structure: see text] Bifunctional macrocycle 1 with C2 symmetry was newly synthesized. NMR studies demonstrated that receptor 1 functions as a chiral shift reagent (solvating agent) that is highly effective for a wide range of chiral compounds having a carboxylic acid, oxazolidinone, lactone, alcohol, sulfoxide, sulfoximine, isocyanate, or epoxide functionality. Binding constants were determined to investigate the binding behavior of 1.
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Affiliation(s)
- Tadashi Ema
- Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama 700-8530, Japan.
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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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Pérez-Trujillo M, Maestre I, Jaime C, Alvarez-Larena A, Piniella JF, Virgili A. Enantioselective preparation and structural and conformational analysis of the chiral solvating agent α,α′-bis(trifluoromethyl)-1,8-anthracenedimethanol. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.tetasy.2005.08.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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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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Ema T, Ouchi N, Doi T, Korenaga T, Sakai T. Highly Sensitive Chiral Shift Reagent Bearing Two Zinc Porphyrins. Org Lett 2005; 7:3985-8. [PMID: 16119948 DOI: 10.1021/ol0514808] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new type of chiral receptor (R,R)- or (S,S)-1b with C(2) symmetry was synthesized. An induced-fit type of binding behavior of 1b for diamines was revealed by CD spectroscopy. NMR studies demonstrated that 1b can function as a highly sensitive chiral shift reagent for the determination of the enantiomeric purity of chiral diamines, aziridine, and isoxazoline at the microgram level. [structure: see text]
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Affiliation(s)
- Tadashi Ema
- Department of Applied Chemistry, Faculty of Engineering, Okayama University, Tsushima, Okayama 700-8530, Japan.
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Bonnet C, Gadelle A, Pécaut J, Fries PH, Delangle P. Inclusion complexes of trivalent lutetium cations with an acidic derivative of per(3,6-anhydro)-α-cyclodextrin. Chem Commun (Camb) 2005:625-7. [PMID: 15672157 DOI: 10.1039/b414870c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The cyclodextrin derivative (hexakis (2-O-carboxymethyl-3,6-anhydro)-alpha-cyclodextrin) forms mono- and bimetallic complexes with lutetium(III) in aqueous solution; the X-ray structure of the binuclear complex [Lu2(ACX)(H2O)2] is the first example of a lanthanide-cyclodextrin inclusion complex.
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Affiliation(s)
- Célia Bonnet
- Laboratoire de Reconnaissance Ionique, SCIB, CEA/DSM/DRFMC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
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Shinoda S, Miyake H, Tsukube H. Molecular recognition and sensing via rare earth complexes. HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS 2005. [DOI: 10.1016/s0168-1273(05)35004-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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