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Todorov AR, Dryś M, Gazagnaire E, Podder M, Kilpeläinen I. Cellulose carbamates via transcarbamoylation/transurethanization of methyl carbamates in superbase-acid conjugate ionic liquids. RSC Adv 2024; 14:23118-23128. [PMID: 39040690 PMCID: PMC11262085 DOI: 10.1039/d4ra04521a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2024] [Accepted: 07/11/2024] [Indexed: 07/24/2024] Open
Abstract
A sustainable homogeneous transcarbamoylation/transurethanization protocol for cellulose modification with methyl N-substituted carbamates was developed. The protocol utilizes the superbase ionic liquid [mTBNH][OAc], not only as a green reaction medium, but also as a promotor of the transformation. This approach allows to obtain different cellulose carbamates with controllable degrees of substitution. The solubility of the obtained materials from the newly developed method was compared with the solubility of materials obtained from the isocyanate approach, where some intrinsic trends were observed.
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Affiliation(s)
- Aleksandar R Todorov
- Materials Chemistry Division, Department of Chemistry, University of Helsinki 00560 Helsinki Finland
| | - Magdalena Dryś
- Materials Chemistry Division, Department of Chemistry, University of Helsinki 00560 Helsinki Finland
- Natural Resources Institute Finland Latokartanonkaari 9 00790 Helsinki Finland
| | - Eva Gazagnaire
- Materials Chemistry Division, Department of Chemistry, University of Helsinki 00560 Helsinki Finland
| | - Manisha Podder
- Materials Chemistry Division, Department of Chemistry, University of Helsinki 00560 Helsinki Finland
| | - Ilkka Kilpeläinen
- Materials Chemistry Division, Department of Chemistry, University of Helsinki 00560 Helsinki Finland
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2
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Yao G, Liu C, Elsherbiny SM, Huang Q. Chiral Recognition of D/L-Ribose by Visual and SERS Assessments. Molecules 2023; 28:6480. [PMID: 37764256 PMCID: PMC10537478 DOI: 10.3390/molecules28186480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/14/2023] [Accepted: 09/03/2023] [Indexed: 09/29/2023] Open
Abstract
Ribose is the central molecular unit in ribose nucleic acid (RNA). Ribose is a key molecule in the study of many persistent scientific mysteries, such as the origin of life and the chiral homogeneity of biological molecules. Therefore, the chiral recognition of ribose is of great significance. The traditional method of chiral recognition of ribose is HPLC, which is time-consuming, expensive, and can only be operated in the laboratory. There is no report on optical analytical techniques that can quickly detect the chirality of ribose. In this study, a simple and convenient approach for the chiral recognition of ribose has been developed. β-cyclodextrin(β-CD)-coated Ag NPs aggregate after adding D-ribose, so that D-/L-ribose can be identified using visual colorimetry and/or surface-enhanced Raman spectroscopy (SERS). The color change visible to the naked eye can readily distinguish the chirality of ribose, while the SERS method can provide the more sensitive analysis of enantiomeric ribose. The advantages of this method are that it is fast, convenient, low cost, and can be operated outside the laboratory. DFT calculations show that D-ribose and cyclodextrin have the same chirality, forming multiple strong hydrogen bonds between them; thus, D/L-ribose will induce different optical effects.
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Affiliation(s)
- Guohua Yao
- The Education Ministry Key Laboratory of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Non-carbon Energy Conversion and Utilization Institute, Shanghai Normal University, Shanghai 200234, China;
- CAS Key Laboratory of Ion-Beam Bioengineering, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; (C.L.)
| | - Chao Liu
- CAS Key Laboratory of Ion-Beam Bioengineering, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; (C.L.)
| | - Shereen M. Elsherbiny
- CAS Key Laboratory of Ion-Beam Bioengineering, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; (C.L.)
| | - Qing Huang
- CAS Key Laboratory of Ion-Beam Bioengineering, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; (C.L.)
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Novel Copper(II) Complexes with Dipinodiazafluorene Ligands: Synthesis, Structure, Magnetic and Catalytic Properties. Molecules 2022; 27:molecules27134072. [PMID: 35807331 PMCID: PMC9268630 DOI: 10.3390/molecules27134072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 06/20/2022] [Accepted: 06/22/2022] [Indexed: 02/06/2023] Open
Abstract
The reactions of CuX2 (X = Cl, Br) with dipinodiazafluorenes yielded four new complexes [CuX2L1]2 (X = Cl (1), Br (2), L1 = (1R,3R,8R,10R)-2,2,9,9-Tetramethyl-3,4,7,8,9,10-hexahydro-1H-1,3:8,10-dimethanocyclopenta [1,2-b:5,4-b’]diquinolin-12(2H)-one) and [(CuX2)2L2]n (X = Cl (3), Br (4), L2 = (1R,3R,8R,10R,1’R,3’R,8’R,10’R)-2,2,2’,2’,9,9,9’,9’-Octamethyl-1,1’,2,2’,3,3’,4,4’,7,7’,8,8’,9,9’,10,10’-hexadecahydro-1,3:1’,3’:8,10:8’,10’-tetramethano-12,12’-bi(cyclopenta [1,2-b:5,4-b’]diquinolinylidene). The complexes were characterized by IR and EPR spectroscopy, HR-ESI-MS and elemental analysis. The crystal structures of compounds 1, 2 and 4 were determined by X-ray diffraction (XRD) analysis. Complexes 1–2 have a monomeric structure, while complex 4 has a polymeric structure due to additional coordinating N,N sites in L2. All complexes contain a binuclear fragment {Cu2(μ-X)2×2} (X = Cl, Br) in their structures. Each copper atom has a distorted square-pyramidal coordination environment formed by two nitrogen atoms and three halogen atoms. The Cu-Nax distance is elongated compared to Cu-Neq. The EPR spectra of compounds 1–4 in CH3CN confirm their paramagnetic nature due to the d9 electronic configuration of the copper(II) ion. The magnetic properties of all compounds were studied by the method of static magnetic susceptibility. For complexes 1 and 2, the effective magnetic moments are µeff ≈ 1.87 and 1.83 µB (per each Cu2+ ion), respectively, in the temperature range 50–300 K, which are close to the theoretical spin value (1.73 µB). Ferromagnetic exchange interactions between Cu(II) ions inside {Cu2(μ-X)2X2} (X = Cl, Br) dimers (J/kB ≈ 25 and 31 K for 1 and 2, respectively) or between dimers (θ′ ≈ 0.30 and 0.47 K for 1 and 2, respectively) were found at low temperatures. For compounds 3 and 4, the magnetic susceptibility is well described by the Curie–Weiss law in the temperature range 1.77–300 K with µeff ≈ 1.72 and 1.70 µB for 3 and 4, respectively, and weak antiferromagnetic interactions (θ ≈ −0.4 K for 3 and −0.65 K for 4). Complexes 1–4 exhibit high catalytic activity in the oxidation of alkanes and alcohols with peroxides. The maximum yield of cyclohexane oxidation products reached 50% (complex 3). Based on the data on the study of regio- and bond-selectivity, it was concluded that hydroxyl radicals play a decisive role in the oxidation reaction. The initial products in reactions with alkanes are alkyl hydroperoxides.
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Debiais M, Gimenez Molina A, Müller S, Vasseur JJ, Barvik I, Baraguey C, Smietana M. Design and NMR characterization of reversible head-to-tail boronate-linked macrocyclic nucleic acids. Org Biomol Chem 2022; 20:2889-2895. [PMID: 35319560 DOI: 10.1039/d2ob00232a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Inspired by the ability of boronic acids to bind with compounds containing diol moieties, we envisioned the formation in solution of boronate ester-based macrocycles by the head-to-tail assembly of a nucleosidic precursor that contains both a boronic acid and the natural 2',3'-diol of ribose. DOSY NMR spectroscopy experiments in water and anhydrous DMF revealed the dynamic assembly of this precursor into dimeric and trimeric macrocycles in a concentration-dependent fashion as well as the reversibility of the self-assembly process. NMR experimental values and quantum mechanics calculations provided further insight into the sugar pucker conformation profile of these macrocycles.
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Affiliation(s)
- Mégane Debiais
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, 1919 route de Mende, 34095 Montpellier, France.
| | - Alejandro Gimenez Molina
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, 1919 route de Mende, 34095 Montpellier, France.
| | - Sabine Müller
- University Greifswald, Institute for Biochemistry, Greifswald, Germany
| | - Jean-Jacques Vasseur
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, 1919 route de Mende, 34095 Montpellier, France.
| | - Ivan Barvik
- Institute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 2, 121 16, Czech Republic
| | - Carine Baraguey
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, 1919 route de Mende, 34095 Montpellier, France.
| | - Michael Smietana
- Institut des Biomolécules Max Mousseron, Université de Montpellier, CNRS, ENSCM, 1919 route de Mende, 34095 Montpellier, France.
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Recognition of Chiral Carboxylates by Synthetic Receptors. Molecules 2021; 26:molecules26216417. [PMID: 34770825 PMCID: PMC8587759 DOI: 10.3390/molecules26216417] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/19/2021] [Accepted: 10/21/2021] [Indexed: 11/17/2022] Open
Abstract
Recognition of anionic species plays a fundamental role in many essential chemical, biological, and environmental processes. Numerous monographs and review papers on molecular recognition of anions by synthetic receptors reflect the continuing and growing interest in this area of supramolecular chemistry. However, despite the enormous progress made over the last 20 years in the design of these molecules, the design of receptors for chiral anions is much less developed. Chiral recognition is one of the most subtle types of selectivity, and it requires very precise spatial organization of the receptor framework. At the same time, this phenomenon commonly occurs in many processes present in nature, often being their fundamental step. For these reasons, research directed toward understanding the chiral anion recognition phenomenon may lead to the identification of structural patterns that enable increasingly efficient receptor design. In this review, we present the recent progress made in the area of synthetic receptors for biologically relevant chiral carboxylates.
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Szemenyei B, Malmosi M, Pál D, Baranyai P, Drahos L, Móczár I, Huszthy P. When crown ethers finally click: novel, click-assembled, fluorescent enantiopure pyridino-crown ether-based chemosensors – and an N-2-aryl-1,2,3-triazole containing one. NEW J CHEM 2021. [DOI: 10.1039/d1nj04173h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorescent chemosensors containing differently connected 1,2,3-triazole units for enantiomeric recognition studies of chiral protonated primary amines and amino acid esters.
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Affiliation(s)
- Balázs Szemenyei
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, H-1521 Budapest, Hungary
| | - Mira Malmosi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, H-1521 Budapest, Hungary
| | - Dávid Pál
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, H-1521 Budapest, Hungary
| | - Péter Baranyai
- Wigner Research Centre for Physics, PO Box 49, H-1525 Budapest, Hungary
| | - László Drahos
- Institute of Organic Chemistry, Research Centre for Natural Sciences, PO Box 286, H-1519 Budapest, Hungary
| | - Ildikó Móczár
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, H-1521 Budapest, Hungary
| | - Péter Huszthy
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, H-1521 Budapest, Hungary
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Taghavi Shahraki B, Maghsoudi S, Fatahi Y, Rabiee N, Bahadorikhalili S, Dinarvand R, Bagherzadeh M, Verpoort F. The flowering of Mechanically Interlocked Molecules: Novel approaches to the synthesis of rotaxanes and catenanes. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213484] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Chirality at the Nanoparticle Surface: Functionalization and Applications. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10155357] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Chiral molecules, such as amino acids and carbohydrates, are the building blocks of nature. As a consequence, most natural supramolecular structures, such as enzymes and receptors, are able to distinguish among different orientations in space of functional groups, and enantiomers of chiral drugs usually have different pharmacokinetic properties and physiological effects. In this regard, the ability to recognize a single enantiomer from a racemic mixture is of paramount importance. Alternatively, the capacity to synthetize preferentially one enantiomer over another through a catalytic process can eliminate (or at least simplify) the subsequent isolation of only one enantiomer. The advent of nanotechnology has led to noteworthy improvements in many fields, from material science to nanomedicine. Similarly, nanoparticles functionalized with chiral molecules have been exploited in several fields. In this review, we report the recent advances of the use of chiral nanoparticles grouped in four major areas, i.e., enantioselective recognition, asymmetric catalysis, biosensing, and biomedicine.
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Synthesis and applications of carbohydrate based chiral ionic liquids as chiral recognition agents and organocatalysts. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.111994] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Tiwari PR, John ME, Karnik AV. Synthesis and Antimicrobial Evaluation of Chiral 3, 5-Diaryl-5, 6-dihydrothiazolo[ 2, 3-c][1, 2, 4]triazoles. LETT ORG CHEM 2019. [DOI: 10.2174/1570178616666190411102818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
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Disclosed herein is a general approach for the synthesis of chiral thiazolo triazoles 5a-e. An
efficient 3-step synthetic strategy has been developed to obtain the fused heterocycles in good yields.
The key step involves formation of a secondary carbocation under acidic condition and intramolecular
attack of the nitrogen of the 1,2,4-triazolo part leads to the formation of fused bicyclic compound in a
regioselective manner. A new chiral center was created during the reaction and Chiral HPLC analyses
confirmed the presence of the same and the racemic nature of the synthesized compounds. Their antimicrobial
activities were evaluated by broth micro-dilution method and expressed as the minimum inhibitory
concentration. The preliminary bioassay results demonstrate that most of the target compounds
exhibit a significantly wide spectrum activity against S. aureus and E. coli comparable to ampicillin.
The efficacies of compounds against C. albicans are either more or similar compared to Griseofulvin.
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Affiliation(s)
- Pawankumar R. Tiwari
- Department of Chemistry, University of Mumbai, Kalina, Santacruz (E), Mumbai - 400098, India
| | - Marina E. John
- Department of Chemistry, University of Mumbai, Kalina, Santacruz (E), Mumbai - 400098, India
| | - Anil V. Karnik
- Department of Chemistry, University of Mumbai, Kalina, Santacruz (E), Mumbai - 400098, India
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Resolution and Racemization of a Planar-Chiral A1/A2-Disubstituted Pillar[5]arene. Symmetry (Basel) 2019. [DOI: 10.3390/sym11060773] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Butoxycarbonyl (Boc)-protected pillar[4]arene[1]-diaminobenzene (BP) was synthesized by introducing the Boc protection onto the A1/A2 positions of BP. The oxygen-through-annulus rotation was partially inhibited because of the presence of the middle-sized Boc substituents. We succeeded in isolating the enantiopure RP (RP, RP, RP, RP, and RP)- and SP (SP, SP, SP, SP, and SP)-BP, and studied their circular dichroism (CD) spectral properties. As the Boc substituent is not large enough to completely prevent the flip of the benzene units, enantiopure BP-f1 underwent racemization in solution. It is found that the racemization kinetics is a function of the solvent and temperature employed. The chirality of the BP-f1 could be maintained in n-hexane and CH2Cl2 for a long period at room temperature, whereas increasing the temperature or using solvents that cannot enter into the cavity of BP-f1 accelerated the racemization of BP-f1. The racemization kinetics and the thermodynamic parameters of racemization were studied in several different organic solvents.
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Tiwari PR, John ME, Karnik AV. Design and synthesis of novel enantiomerically enriched morpholino [4, 3–a] benzimidazole derivatives as potential bioactive agents. SYNTHETIC COMMUN 2018. [DOI: 10.1080/00397911.2018.1514052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
| | - Marina E. John
- Department of Chemistry, University of Mumbai, Mumbai, India
| | - Anil V. Karnik
- Department of Chemistry, University of Mumbai, Mumbai, India
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