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Trojan M, Kučnirová K, Bouzková Š, Cvačka J, Čejka J, Tavčar G, Rybáčková M, Kvíčala J. Quaternary ammonium fluorides and difluorosilicates as nucleophilic fluorination reagents. Org Biomol Chem 2024; 22:1047-1056. [PMID: 38197465 DOI: 10.1039/d3ob01875j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
TBAT (tetrabutylammonium difluorotriphenylsilicate) is an excellent homogeneous nucleophilic fluorination reagent, but a high excess of the reagent was reported to be essential. We hence optimized the reaction conditions and compared its nucleophilic fluorination reactivity with that of other common commercial nucleophilic fluorination reagents, such as anhydrous TBAF and TASF (tris(dimethylamino)sulfonium difluorotrimethylsilicate). As the substrates, we employed a standard set of primary and secondary octyl substrates under identical conditions. To eliminate the possibility of hydrogen fluoride elimination in the above reagents, we prepared four quaternary ammonium fluorides lacking β-elimination possibility in the hydrocarbon chain, transformed them to the corresponding difluorotriphenylsilicates, and compared their reactivity with that of the commercial reagents. Furthermore, attempts to isolate analogous tetrabutylammonium difluoromethyldiphenylsilicate or difluorodimethylphenylsilicate failed, as was confirmed by comparison of the published experimental data with computed 19F NMR spectra. Finally, we studied the transition states of decomposition of various tetramethylammonium methylphenyldifluorosilicates by DFT methods and found that their relative energies increase with an increasing number of phenyl groups. The formation of difluorosilicates is a nearly barrierless process.
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Affiliation(s)
- Michal Trojan
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Kateřina Kučnirová
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Šárka Bouzková
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Josef Cvačka
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 542/2, 160 00 Prague 6, Czech Republic
| | - Jan Čejka
- Department of Solid State Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Gašper Tavčar
- Department of Inorganic Chemistry and Technology, "Jožef Stefan" Institute, Jamova cesta 39, Ljubljana, Slovenia
| | - Markéta Rybáčková
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
| | - Jaroslav Kvíčala
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic.
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2
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Del Mauro A, Lapešová J, Rando C, Šindelář V. Merging Bambus[6]uril and Biotin[6]uril into an Enantiomerically Pure Monofunctionalized Hybrid Macrocycle. Org Lett 2024; 26:106-109. [PMID: 38153981 PMCID: PMC10789090 DOI: 10.1021/acs.orglett.3c03715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 12/19/2023] [Accepted: 12/26/2023] [Indexed: 12/30/2023]
Abstract
Bambus[6]urils and biotin[6]urils are macrocycles with an exceptional affinity for inorganic anions. Here, we investigated statistical condensation of 2,4-dibenzylglycoluril and d-biotin, monomers of the corresponding macrocycles, to prepare the enantiomerically pure macrocycle 1 containing a single d-biotin and five glycoluril units. Host-guest properties of 1 in chloroform solution and solid state were investigated. The macrocycle 1 bearing a single functional group was employed in the formation of [1]rotaxane utilizing reversible covalent bonds.
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Affiliation(s)
- Arico Del Mauro
- Department
of Chemistry, Faculty of Science, Masaryk
University, 625 00 Brno, Czech Republic
- RECETOX,
Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
| | - Jana Lapešová
- Department
of Chemistry, Faculty of Science, Masaryk
University, 625 00 Brno, Czech Republic
- RECETOX,
Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
| | - Carola Rando
- Department
of Chemistry, Faculty of Science, Masaryk
University, 625 00 Brno, Czech Republic
- RECETOX,
Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
| | - Vladimír Šindelář
- Department
of Chemistry, Faculty of Science, Masaryk
University, 625 00 Brno, Czech Republic
- RECETOX,
Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
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Slávik P, Torrisi J, Jurček P, Sokolov J, Šindelář V. Synthesis of Enantiomerically Pure Bambus[6]urils Utilizing Orthogonal Protection of Glycolurils. J Org Chem 2023; 88:11514-11522. [PMID: 37505936 PMCID: PMC10442914 DOI: 10.1021/acs.joc.3c00667] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Indexed: 07/30/2023]
Abstract
A general strategy for the synthesis of 2N,4N'-disubstituted glycoluril enantiomers on a multigram scale using orthogonal protection is reported. The use of these glycolurils is demonstrated in the synthesis of enantiomerically pure bambus[6]uril macrocycles. Moreover, the deprotection of (S)-1-phenylethyl substituents on the macrocycle was achieved, opening access to various chiral bambus[6]urils via post-macrocyclization modification strategy.
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Affiliation(s)
- Petr Slávik
- Department
of Chemistry, Faculty of Science, Masaryk
University, 625 00 Brno, Czech
Republic
- RECETOX,
Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
| | - Jacopo Torrisi
- Department
of Chemistry, Faculty of Science, Masaryk
University, 625 00 Brno, Czech
Republic
- RECETOX,
Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
| | - Pia Jurček
- Department
of Chemistry, Faculty of Science, Masaryk
University, 625 00 Brno, Czech
Republic
- RECETOX,
Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
| | - Jan Sokolov
- Department
of Chemistry, Faculty of Science, Masaryk
University, 625 00 Brno, Czech
Republic
- RECETOX,
Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
| | - Vladimír Šindelář
- Department
of Chemistry, Faculty of Science, Masaryk
University, 625 00 Brno, Czech
Republic
- RECETOX,
Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
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4
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Recent progress of antibacterial hydrogels in wound dressings. Mater Today Bio 2023; 19:100582. [PMID: 36896416 PMCID: PMC9988584 DOI: 10.1016/j.mtbio.2023.100582] [Citation(s) in RCA: 41] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/26/2023] [Accepted: 02/10/2023] [Indexed: 02/17/2023] Open
Abstract
Hydrogels are essential biomaterials due to their favorable biocompatibility, mechanical properties similar to human soft tissue extracellular matrix, and tissue repair properties. In skin wound repair, hydrogels with antibacterial functions are especially suitable for dressing applications, so novel antibacterial hydrogel wound dressings have attracted widespread attention, including the design of components, optimization of preparation methods, strategies to reduce bacterial resistance, etc. In this review, we discuss the fabrication of antibacterial hydrogel wound dressings and the challenges associated with the crosslinking methods and chemistry of the materials. We have investigated the advantages and limitations (antibacterial effects and antibacterial mechanisms) of different antibacterial components in the hydrogels to achieve good antibacterial properties, and the response of hydrogels to stimuli such as light, sound, and electricity to reduce bacterial resistance. Conclusively, we provide a systematic summary of antibacterial hydrogel wound dressings findings (crosslinking methods, antibacterial components, antibacterial methods) and an outlook on long-lasting antibacterial effects, a broader antibacterial spectrum, diversified hydrogel forms, and the future development prospects of the field.
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Zhang W, Zhao J, Yang D. Anion-Coordination-Driven Assembly: From Discrete Supramolecular Self-Assemblies to Functional Soft Materials. Chempluschem 2022; 87:e202200294. [PMID: 36410745 DOI: 10.1002/cplu.202200294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 10/18/2022] [Indexed: 01/31/2023]
Abstract
Anion templated assembly of supramolecular systems has been extensively explored in previous reports, whereas anions serve only as an auxiliary and spectator role. With the development of anion coordination chemistry in recent years, anion coordination-driven assembly (ACDA) has emerged as a new strategy for the construction of supramolecular self-assemblies. Anions are proved to exist as the main actors in the construction of supramolecular architectures, i. e., serve as the coordination center. This Review will focus on the recent progress in anion-coordination-driven assembly of discrete supramolecular architectures, such as helicates, polyhedrons and polygons, and the various applications of 'aniono'-systems. At the end of this Review, we highlight current challenges and opportunities for future research of anion-coordination-driven self-assembly.
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Affiliation(s)
- Wenyao Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, P. R. China.,Key Laboratory of Magnetic Molecules and Magnetic Information Materials (Ministry of Education), School of Chemistry and Material Science, Shanxi Normal University, Taiyuan, 030006, P. R. China
| | - Jie Zhao
- School of Chemistry and Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China
| | - Dong Yang
- Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, P. R. China
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Del Mauro A, Kokan Z, Šindelář V. Dynamic [1]rotaxanes via a reversible covalent bond and host-guest anion recognition. Chem Commun (Camb) 2022; 58:3815-3818. [PMID: 35234240 DOI: 10.1039/d2cc00779g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bambus[6]uril-based [1]rotaxanes were formed quantitatively, utilizing a bis(acyloxy)iodate(I) reversible covalent bond and host-guest anion recognition. These novel [1]rotaxanes exhibited a dynamic nature facilitating carboxylate component exchange reactions in acetonitrile.
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Affiliation(s)
- Arico Del Mauro
- Department of Chemistry and RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Zoran Kokan
- Department of Chemistry and RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Vladimír Šindelář
- Department of Chemistry and RECETOX, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
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