1
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Galindres DM, Ribeiro AC, Esteso MA, Vargas EF. Standard molar properties of ionic resorcinarenes in water and dimethysulfoxide. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
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2
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Liu JL, Zhou XM, Sun M, Jia AQ, Shi HT, Zhang QF. A resorcinarene based chelating agent for selective cloud point extraction of Pb2+ ions in water: Synthesis, structural characterization and analytical applications. ARAB J CHEM 2023. [DOI: 10.1016/j.arabjc.2023.104866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023] Open
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3
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Pineda-Castañeda H, Rivera-Monroy ZJ, Maldonado M. Copper(I)-Catalyzed Alkyne-Azide Cycloaddition (CuAAC) "Click" Reaction: A Powerful Tool for Functionalizing Polyhydroxylated Platforms. ACS OMEGA 2023; 8:3650-3666. [PMID: 36743057 PMCID: PMC9893463 DOI: 10.1021/acsomega.2c06269] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 12/23/2022] [Indexed: 05/13/2023]
Abstract
Click chemistry is currently one of the most used tools for the generation of complex organic molecules. The advantages of using click chemistry in organic synthesis are remarkable; in many cases, the reactions occur under mild conditions and are free of solvents, with high yields and short reaction times. This makes it an extraordinarily effective and viable alternative for obtaining complex/conjugated molecules. In this review, the use of click chemistry CuAAC is especially emphasized for polyhydroxylated platforms such as resorcinarenes or calixarenes, focusing mainly on aspects of synthesis, specifically conditions, reagents, and methodologies.
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Affiliation(s)
- Héctor
Manuel Pineda-Castañeda
- Chemistry
Department, Universidad Nacional de Colombia,
Bogotá, Carrera 45 No 26-85, Building 451, office 409, Bogotá 11321, Colombia
| | - Zuly Jenny Rivera-Monroy
- Chemistry
Department, Universidad Nacional de Colombia,
Bogotá, Carrera 45 No 26-85, Building 451, office 409, Bogotá 11321, Colombia
| | - Mauricio Maldonado
- Chemistry
Department, Universidad Nacional de Colombia,
Bogotá, Carrera 45 No 26-85, Building 451, office 409, Bogotá 11321, Colombia
- Email
for M.M.:
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4
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Sanabria E, Esteso MA, Vargas EF. Recognition of Heavy Metals by Using Resorcin[4]arenes Soluble in Water. TOXICS 2022; 10:toxics10080461. [PMID: 36006140 PMCID: PMC9415269 DOI: 10.3390/toxics10080461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/19/2022] [Accepted: 08/01/2022] [Indexed: 05/09/2023]
Abstract
The complexing properties of two water-soluble resorcin[4]arenes (tetrasodium 5,11,17,23-tetrakissulfonatemethylen 2,8,14,20-tetra(butyl)resorcin[4]arene, Na4BRA, and tetrasodium 5,11,17,23-tetrakissulfonatemethylen-2,8,14,20-tetra(2-(methylthio)ethyl)resorcin[4]arene, Na4SRA) with polluting heavy metals such as Cu2+, Pb2+, Cd2+ and Hg2+ were studied by conductivity, and the findings were confirmed by using other techniques to try to apply this knowledge to removing them. The results indicate that Na4BRA is able to complex Cu2+ in a 1:1 ratio and Pb2+ in a 1:2 ratio, while Na4SRA complexes Hg2+ in a 1:1 ratio. On the contrary, no indications have been observed that either of the resorcin[4]arenes studied complexes the Cd2+ ions. The results suggest that the bonds established between the sulfur atoms located at the lower edge of the SRA4- and the solvent hydrogens could prevent the entry of the guest into the host cavity. However, in the case of Hg2+ ions, the entry is favoured by the interactions between the sulfur donor atoms present on the lower edge of Na4SRA and the Hg2+ ions. Therefore, it can be said that Na4BRA is selective for Cu2+ and Pb2+ ions and Na4SRA is selective for Hg2+ ions.
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Affiliation(s)
- Edilma Sanabria
- Grupo GICRIM, Programa de Investigación Criminal, Universidad Manuela Beltrán, Avenida Circunvalar No. 60-00, Bogota 111321, Colombia
| | - Miguel A. Esteso
- Universidad Católica de Ávila, Calle los Canteros s/n, 05005 Ávila, Spain
- Unidad Docente Química Física, Universidad de Alcalá, 28805 Alcalá de Henares (Madrid), Spain
- Correspondence: (M.A.E.); (E.F.V.)
| | - Edgar F. Vargas
- Departamento de Química, Universidad de los Andes, Cr. 1 No. 18A 10, Bogota 111711, Colombia
- Correspondence: (M.A.E.); (E.F.V.)
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5
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Liu JL, Zhang PZ, Jia AQ, Shi HT, Zhang QF. Supramolecular Assemblies of Sulfonatomethylated Calix[4]resorcinarenes with Aquated Sodium(I), Cesium(I), and Aluminum(III) Ions. ChemistrySelect 2022. [DOI: 10.1002/slct.202104118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jing L. Liu
- Institute of Molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan Anhui 243002 P. R. China
| | - Pei Z. Zhang
- Institute of Molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan Anhui 243002 P. R. China
| | - Ai Q. Jia
- Institute of Molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan Anhui 243002 P. R. China
| | - Hua T. Shi
- Institute of Molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan Anhui 243002 P. R. China
| | - Qian F. Zhang
- Institute of Molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan Anhui 243002 P. R. China
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6
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Quaglio D, Polli F, Del Plato C, Cianfoni G, Tortora C, Mazzei F, Botta B, Calcaterra A, Ghirga F. Calixarene: a versatile scaffold for the development of highly sensitive biosensors. Supramol Chem 2021. [DOI: 10.1080/10610278.2021.2011283] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Deborah Quaglio
- Department of Chemistry and Technology of Drugs, Sapienza - University of Rome, Rome, Italy
| | - Francesca Polli
- Department of Chemistry and Technology of Drugs, Sapienza - University of Rome, Rome, Italy
| | - Cristina Del Plato
- Department of Chemistry and Technology of Drugs, Sapienza - University of Rome, Rome, Italy
- Center for Life Nano- & Neuro-Science@Sapienza, Italian Institute of Technology, Rome, Italy
| | - Gabriele Cianfoni
- Department of Chemistry and Technology of Drugs, Sapienza - University of Rome, Rome, Italy
- Center for Life Nano- & Neuro-Science@Sapienza, Italian Institute of Technology, Rome, Italy
| | - Carola Tortora
- Department of Chemistry and Technology of Drugs, Sapienza - University of Rome, Rome, Italy
| | - Franco Mazzei
- Department of Chemistry and Technology of Drugs, Sapienza - University of Rome, Rome, Italy
| | - Bruno Botta
- Department of Chemistry and Technology of Drugs, Sapienza - University of Rome, Rome, Italy
| | - Andrea Calcaterra
- Department of Chemistry and Technology of Drugs, Sapienza - University of Rome, Rome, Italy
| | - Francesca Ghirga
- Department of Chemistry and Technology of Drugs, Sapienza - University of Rome, Rome, Italy
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7
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Castillo-Aguirre A, Esteso MA, Maldonado M. Resorcin[4]arenes: Generalities and Their Role in the Modification and Detection of Amino Acids. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824999200510232141] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The characteristics and properties that enable resorcin[4]arenes to self-assemble
in order to form derivatives with amino acids with a high potential for application in various
fields are reviewed. In particular, resorcin[4]arene synthesis, their characteristics, the
variety in the size of cavity, their functional groups, and their applications associated with
molecular interactions are described in this study. Also, the types of amino acids that can
be recognized by resorcin[4]arenes, their interactions, the techniques that allow the determination
of the association constants, and the evaluation of the stoichiometry of the complex
formed, are reviewed.
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Affiliation(s)
- Alver Castillo-Aguirre
- Department of Chemistry, Faculty of Science, National University of Colombia-Bogota Headquarters, 30 No. 45-03 Carrera, Colombia
| | - Miguel Angel Esteso
- Universidad Catolica Santa Teresa de Jesus de Avila. Calle los Canteros s/n. 05005 Avila, Spain
| | - Mauricio Maldonado
- Department of Chemistry, Faculty of Science, National University of Colombia-Bogota Headquarters, 30 No. 45-03 Carrera, Colombia
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8
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Castillo-Aguirre AA, Pérez-Redondo A, Maldonado M. Influence of the hydrogen bond on the iteroselective O-alkylation of calix[4]resorcinarenes. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127402] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Velásquez-Silva A, Forero RS, Sanabria E, Pérez-Redondo A, Maldonado M. Host-guest inclusion systems of tetra(alkyl)resorcin [4]arenes with choline in DMSO: Dynamic NMR studies and X-ray structural characterization of the 1:1 inclusion complex. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.07.093] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Velásquez-Silva BA, Castillo-Aguirre A, Rivera-Monroy ZJ, Maldonado M. Aminomethylated Calix[4]resorcinarenes as Modifying Agents for Glycidyl Methacrylate (GMA) Rigid Copolymers Surface. Polymers (Basel) 2019; 11:polym11071147. [PMID: 31277429 PMCID: PMC6680909 DOI: 10.3390/polym11071147] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 06/28/2019] [Accepted: 07/02/2019] [Indexed: 01/16/2023] Open
Abstract
Functionalization of tetrapropylcalix[4]resorcinarene, tetrapentylcalix[4]resorcinarene, tetranonylcalix[4]resorcinarene, and tetra-(4-hydroxyphenyl)calix[4]resorcinarene by means of aminomethylation reactions with the amino acids β-alanine and l-proline in the presence of aqueous formaldehyde was carried out. When β-alanine was used, the reaction products were tetrabenzoxazines. The reaction with tetra-(4-hydroxyphenyl)calix[4]resorcinarene did not proceed under the experimental conditions; therefore, l-proline was used, and the corresponding tetra-Mannich base was regio- and diasteroselectively formed. The products were characterized via FT-IR, 1H NMR, 13C NMR, and elemental analysis. With these aminomethylated-calix[4]resorcinarenes, the chemical surface modification of the copolymers poly(GMA-co-EDMA) and poly(BMA-co-EDMA-co-MMA) in a basic medium was studied. The results were quite satisfactory, obtaining the corresponding copolymers functionalized by nucleophilic substitution reaction and ring-opening between the carboxyl group of the upper rim of aliphatic calix[4]resorcinarenes and the hydroxyl group of the lower rim in the aromatic calix[4]resorcinarene and the epoxy group of the glycidyl methacrylate residue of each copolymer. The modified copolymers were characterized via FT-IR, scanning electron microscopy imaging, and elemental analysis. Finally, the modified copolymer surfaces exhibited interaction with peptides, showing their potential application in chromatographic separation techniques such as high-performance liquid chromatography.
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Affiliation(s)
- Betty Astrid Velásquez-Silva
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, Carrera 30 No. 45-03, 7122 Carrera, Colombia
| | - Alver Castillo-Aguirre
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, Carrera 30 No. 45-03, 7122 Carrera, Colombia
| | - Zuly Jenny Rivera-Monroy
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, Carrera 30 No. 45-03, 7122 Carrera, Colombia
| | - Mauricio Maldonado
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, Carrera 30 No. 45-03, 7122 Carrera, Colombia.
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11
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Jordan JH, Wishard A, Mague JT, Gibb BC. Binding Properties and Supramolecular Polymerization of a Water-Soluble Resorcin[4]arene. Org Chem Front 2019; 6:1236-1243. [PMID: 31772734 PMCID: PMC6879061 DOI: 10.1039/c9qo00182d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Controlling the self-assembly of molecules in water is difficult because the small size, polarity, and hydrogen bond donating and accepting properties of water attenuate most non-covalent interactions. Here we describe how resorcinarene 1, with pyridinium pendent groups, assembles in water to form head-to-tail assemblies. These small supramolecular polymers form because they offer greater stabilization than any latent head-to-head assembly of resorcinarenes to form dimeric (or hexameric) containers. Instead, the resorcinarene bowl - particularly if negatively charged - is a good host for the pyridinium pendent groups of a second resorcinarene. Alternatively, resorcinarene 1 is also a good host for complexing anions and cations of any added salt. In combination therefore, host 1 possesses a rich repertoire of supramolecular properties that is dependent on the ionic strength and the nature of salts, pH, and the concentration of the host. These findings provide new information about controlling the self-assembly of resorcinarenes in water.
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Affiliation(s)
- Jacobs H Jordan
- Department of Chemistry, Tulane University, New Orleans, LA 70118, USA,
| | - Anthony Wishard
- Department of Chemistry, Tulane University, New Orleans, LA 70118, USA,
| | - Joel T Mague
- Department of Chemistry, Tulane University, New Orleans, LA 70118, USA,
| | - Bruce C Gibb
- Department of Chemistry, Tulane University, New Orleans, LA 70118, USA,
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12
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Castillo-Aguirre AA, Rivera Monroy ZJ, Maldonado M. Analysis by RP-HPLC and Purification by RP-SPE of the C-Tetra( p-hydroxyphenyl)resorcinolarene Crown and Chair Stereoisomers. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2019; 2019:2051282. [PMID: 31143485 PMCID: PMC6501146 DOI: 10.1155/2019/2051282] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 03/10/2019] [Accepted: 03/27/2019] [Indexed: 05/27/2023]
Abstract
A method for the separation of stereoisomer mixture of the octol C-tetra(p-hydroxyphenyl)calix[4]resorcinarene that was obtained by an acid cyclocondensation reaction between resorcinol and benzaldehyde is reported in this paper. A crude product from octol formation reaction was analyzed by reverse-phase high-performance liquid chromatography (RP-HPLC), and two well-resolved signals corresponding to the crown and chair isomers were found. A reverse phase in solid-phase extraction (RP-SPE) protocol allowed the separation of the two stereoisomers with high purity of each isomer. Finally, the crude and purified stereoisomers were characterized by using FT-IR, 1H-NMR, and 13C-NMR techniques, confirming the chemical identity of the two isomers and the efficiency in the separation process.
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Affiliation(s)
- Alver A. Castillo-Aguirre
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, Bogota 11001, Colombia
| | - Zuly Jenny Rivera Monroy
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, Bogota 11001, Colombia
| | - Mauricio Maldonado
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Sede Bogotá, Bogota 11001, Colombia
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13
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Calixarenes: Generalities and Their Role in Improving the Solubility, Biocompatibility, Stability, Bioavailability, Detection, and Transport of Biomolecules. Biomolecules 2019; 9:biom9030090. [PMID: 30841659 PMCID: PMC6468619 DOI: 10.3390/biom9030090] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 02/24/2019] [Accepted: 02/28/2019] [Indexed: 12/11/2022] Open
Abstract
The properties and characteristics of calix[n]arenes are described, as well as their capacity to form amphiphilic assemblies by means of the design of synthetic macrocycles with a hydrophilic head and a hydrophobic tail. Their interaction with various substances of interest in pharmacy, engineering, and medicine is also described. In particular, the role of the calix[n]arenes in the detection of dopamine, the design of vesicles and liposomes employed in the manufacture of systems of controlled release drugs used in the treatment of cancer, and their role in improving the solubility of testosterone and anthelmintic drugs and the biocompatibility of biomaterials useful for the manufacture of synthetic organs is emphasized. The versatility of these macrocycles, able to vary in size, shape, functional groups, and hydrophobicity and to recognize various biomolecules and molecules with biological activity without causing cytotoxicity is highlighted.
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14
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Abstract
This article is based on a review of the literature and our own experience with toxicological molecules. We explain the nature of calix[n]arenes and as their recognized properties are used to detect compounds of toxicological interest, mainly the most important pesticide families such as organophosphorated, organochlorine compounds, pyrethroid insecticides, carbamate fungicides, and herbicides, using different techniques. In addition, we show the role of the macrocycle and its interactions, and the advantage of using this type of compound for improving conventional techniques, where the phenomenon of recognition is very important, such as chromatography, solid-phased extraction, and the development of specific sensors, among others and Even we also show the use of this macrocycle for detoxication procedures in vivo. In this way, we display as the multiple possibilities of functionalization of the calix[n]arenes makes these versatile molecules in the phenomena of specific recognition. Finally, This review highlights the main analytical methods reported in the literature for determination of plaguicides by host-guest interaction with calixarenes. In this way, among the available analytical tools, chromatographic, and electrochemical-based methods are the most used techniques for the detection and to quantify plaguicides using calixarenes.
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Affiliation(s)
- Edilma Sanabria Español
- Grupo GICRIM, Programa de Investigación Criminal , Universidad Manuela Beltrán , Bogotá , Colombia
| | - Mauricio Maldonado
- Departamento de Química, Facultad de Ciencias , Universidad Nacional de Colombia , Bogotá , Colombia
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15
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Diffusion and conductance properties of aqueous solutions of tetrasodium 5,11,17,23-tetrakissulfonatemethylen-2,8,14,20-tetra(2-(methylthio)ethyl)resorcinarene. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Casas-Hinestroza JL, Maldonado M. Conformational Aspects of the O-acetylation of C-tetra(phenyl)calixpyrogallol[4]arene. Molecules 2018; 23:molecules23051225. [PMID: 29783780 PMCID: PMC6100403 DOI: 10.3390/molecules23051225] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2018] [Revised: 05/15/2018] [Accepted: 05/17/2018] [Indexed: 11/16/2022] Open
Abstract
Reaction between pyrogallol and benzaldehyde results in a conformational mixture of C-tetra(phenyl)pyrogallol[4]arene (crown and chair). The conformer mixture was separated using crystallization procedures and the structures were determined using FTIR, 1H-NMR, and 13C-NMR. O-acetylation of C-tetra(phenyl)pyrogallol[4]arene (chair) with acetic anhydride, in pyridine results in the formation of dodecaacetyl-tetra(phenyl)pyrogallol[4]arene. The structure was determined using 1H-NMR and 13C-NMR finding that the product maintains the conformation of the starting conformer. On the other hand, the O-acetylation reaction of C-tetra(phenyl)pirogallol[4]arene (crown) under same conditions proceeded efficiently, and its structure was determined using 1H-NMR and 13C-NMR. Dynamic 1H-NMR of acetylated pyrogallolarene was studied by means of variable temperature in DMSO-d6 solution, and it revealed that two conformers are formed in the solution. Boat conformations for acetylated pyrogallolarene showed a slow interconversion at room temperature.
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Affiliation(s)
- José Luis Casas-Hinestroza
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-sede Bogotá, Carrera 30 # 45-03, Bogotá 111321, Columbia.
| | - Mauricio Maldonado
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-sede Bogotá, Carrera 30 # 45-03, Bogotá 111321, Columbia.
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17
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Sanabria E, Esteso MÁ, Vargas E, Maldonado M. Experimental comparative study of solvent effects on the structure of two sulfonated resorcinarenes. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.01.111] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Sanabria Español E, Maldonado Villamil M, Esteso MÁ, Vargas EF. Volumetric and acoustic properties of two sodium sulfonateresorcin[4]arenes in water and dimethylsulfoxide. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2017.11.060] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Han X, Tian C, Gandra I, Eslava V, Galindres D, Vargas E, Leblanc R. The Investigation on Resorcinarenes towards either Inhibiting or Promoting Insulin Fibrillation. Chemistry 2017; 23:17903-17907. [DOI: 10.1002/chem.201704932] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Indexed: 01/28/2023]
Affiliation(s)
- Xu Han
- Department of Chemistry; University of Miami; Coral Gables FL 33146 United States
| | - Chuan Tian
- Department of Chemistry and Laufer Center for Physical and Quantitative Biology; Stony Brook University; Stony Brook New York 11794-3400 United States
| | - Ingrid Gandra
- Florida International University; 10555 West Flagler Street Miami FL 33174 United States
| | - Valeria Eslava
- Departamento de Quimica; Universidad de los Andes; Cr. 1, No. 18A 10 Bogota 111711 Colombia
| | - Diana Galindres
- Departamento de Quimica; Universidad de los Andes; Cr. 1, No. 18A 10 Bogota 111711 Colombia
| | - Edgar Vargas
- Departamento de Quimica; Universidad de los Andes; Cr. 1, No. 18A 10 Bogota 111711 Colombia
| | - Roger Leblanc
- Department of Chemistry; University of Miami; Coral Gables FL 33146 United States
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Selective O-Alkylation of the Crown Conformer of Tetra(4-hydroxyphenyl)calix[4]resorcinarene to the Corresponding Tetraalkyl Ether. Molecules 2017; 22:molecules22101660. [PMID: 28976918 PMCID: PMC6151838 DOI: 10.3390/molecules22101660] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Revised: 09/29/2017] [Accepted: 09/30/2017] [Indexed: 11/17/2022] Open
Abstract
Reactions of glycidyl methacrylate with the crown and chair conformers of tetra(4-hydroxyphenyl)calix[4]resorcinarene were studied. The reactions were done over epoxide groups present in the ester, which can easily undergo an opening reaction with hydroxyl groups in the macrocyclic system. Initially, epoxidation reactions were carried out with pure conformers, and it was observed that the reaction between tetra(4-hydroxyphenyl)calix[4]resorcinarene fixed in the chair conformation does not occur, while for the molecule fixed in the crown conformation only one tetraalkylated derivative was obtained. The obtained product was characterized using IR, ¹H-NMR, 13C-NMR, COSY, HMQC and HMBC techniques. An exhaustive NMR study showed that the reaction is selective at the hydroxyl groups in the lower rim, without affecting the hydroxyl groups in the upper rim. In addition, the RP-HPLC analysis of the epoxidation reaction mixture, using both crown and chair conformers, showed that only the crown conformer reacted under tested conditions. Finally, a comparative study of the reactivity of tetranonylcalix[4]resorcinarene with glycidyl methacrylate showed that the reaction does not take place. Instead, the formation of the tetranonylcalix[4]resorcinarene tetrasodium salt was observed, which confirms that the hydroxyl groups in the upper rim are unreactive under these conditions.
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22
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Han X, Park J, Wu W, Malagon A, Wang L, Vargas E, Wikramanayake A, Houk KN, Leblanc RM. A resorcinarene for inhibition of Aβ fibrillation. Chem Sci 2017; 8:2003-2009. [PMID: 28451317 PMCID: PMC5398272 DOI: 10.1039/c6sc04854d] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 11/17/2016] [Indexed: 12/24/2022] Open
Abstract
Amyloid-β peptides (Aβ) fibrillation is the hallmark of Alzheimer's disease (AD). However, it has been challenging to discover potent agents in order to inhibit Aβ fibrillation. Herein, we demonstrated the effect of resorcinarene on inhibiting Aβ fibrillation in vitro via experimental and computational methods. Aβ were incubated with different concentrations of resorcinarene so as to monitor the kinetics by using thioflavin T binding assay. The results, which were further confirmed by far-UV CD spectroscopy and atomic force microscopy, strongly indicated that the higher concentration of resorcinarene, the more effective the inhibition of Aβ fibrillation. A cytotoxicity study showed that when sea urchin embryos were exposed to the resorcinarene, the majority survived due to the resorcinarene low toxicity. In addition, when the resorcinarene was added, the formation of toxic Aβ 42 species was delayed. Computational studies of Aβ fibrillation, including docking simulations and MD simulations, illustrated that the interaction between inhibitor resorcinarene and Aβ is driven by the non-polar interactions. These studies display a novel strategy for the exploration of promising antiamyloiddogenic agents for AD treatments.
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Affiliation(s)
- Xu Han
- Department of Chemistry , Cox Science Center , University of Miami , Coral Gables , Florida 33146 , USA .
| | - Jiyong Park
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095 , USA .
| | - Wei Wu
- Department of Biology , Cox Science Center , University of Miami , Coral Gables , Florida 33146 , USA
| | - Andres Malagon
- Departamento de Quimica , Universidad de los Andes , Cr. 1 No. 18A 10 , Bogota 111711 , Colombia
| | - Lingyu Wang
- Department of Biology , Cox Science Center , University of Miami , Coral Gables , Florida 33146 , USA
| | - Edgar Vargas
- Departamento de Quimica , Universidad de los Andes , Cr. 1 No. 18A 10 , Bogota 111711 , Colombia
| | - Athula Wikramanayake
- Department of Biology , Cox Science Center , University of Miami , Coral Gables , Florida 33146 , USA
| | - K N Houk
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095 , USA .
| | - Roger M Leblanc
- Department of Chemistry , Cox Science Center , University of Miami , Coral Gables , Florida 33146 , USA .
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