10 results on '"Aromatic fluorination"'
Search Results
2. Aromatic Fluorination of Multiblock Amphiphile Enhances Its Incorporation into Lipid Bilayer Membranes.
- Author
-
Sasaki, Ryo, Sato, Kohei, and Kinbara, Kazushi
- Subjects
- *
FLUORINATION , *BILAYER lipid membranes , *ORGANIC solvents , *SUPRAMOLECULAR chemistry - Abstract
We designed multiblock amphiphiles AmF and AmH, which consist of perfluorinated and non‐fluorinated hydrophobic units, respectively. Absorption spectroscopy revealed that both amphiphiles are molecularly dispersed in organic solvent, while they form aggregates under aqueous conditions. Furthermore, we investigated whether AmF and AmH can be incorporated into DOPC lipid bilayer membranes, and found that the maximum concentration of AmF that can be incorporated into DOPC lipid bilayer membranes is 43 times higher than that of AmH. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
3. How aromatic fluorination exchanges the interaction role of pyridine with carbonyl compounds: The formaldehyde adduct
- Author
-
López Alonso, Juan Carlos and López Alonso, Juan Carlos
- Abstract
Producción Científica, The rotational spectrum of the weakly bound complex pentafluoropyridineꞏꞏꞏformaldehyde has been investigated using Fourier transform microwave spectroscopy. From the analysis of the rotational parameters of the parent species and of the 13C and 15N isotopologues, the structural arrangement of the adduct has been unambiguously established. The full ring fluorination of pyridine has a dramatic effect on its binding properties: It alters the electron density distribution at the π-cloud of pyridine creating a π-hole and changing its electron donor-acceptor capabilities. In the complex, formaldehyde lies above the aromatic ring with one of the oxygen lone pairs, as conventionally envisaged, pointing toward its centre. This lone pairꞏꞏꞏπ-hole interaction, reinforced by a weak C-HꞏꞏꞏN interaction, indicates an exchange of the electron-acceptor roles of both molecules when compared to the pyridineꞏꞏꞏformaldehyde adduct. Tunnelling doublets due to the internal rotation of formaldehyde have also been observed and analysed leading to a discussion on the competition between lone pairꞏꞏꞏπ-hole and π ꞏꞏꞏπ staking interactions., Ministerio de Economía y Competitividad (Grant CTQ2016-75253-P), Ministerio de Ciencia, Innovación y Universidades de España (Proyecto No. PGC2018-094644-B-C22), Comunidad Autónoma de Madrid (P2018 / EMT-4329 AIRTEC-CM)
- Published
- 2021
4. How Aromatic Fluorination Exchanges the Interaction Role of Pyridine with Carbonyl Compounds: The Formaldehyde Adduct
- Author
-
Juan C. López, Susana Blanco, Ibon Alkorta, Assimo Maris, Alberto Macario, Lopez J.C., Macario A., Maris A., Alkorta I., Blanco S., Universidad de Valladolid [Valladolid] (UVa), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Comunidad de Madrid, Università di Bologna, Alkorta, Ibon [0000-0001-6876-6211], and Alkorta, Ibon
- Subjects
Rotational spectroscopy ,Non-covalent interactions ,Aromatic fluorination ,Pyridine ,Stacking ,Hot Paper ,Ring (chemistry) ,Pentafluoropyridine ,01 natural sciences ,Catalysis ,Molecular adducts ,Pi-hole interactions ,Adduct ,non-covalent interaction ,chemistry.chemical_compound ,Carbonyl compounds ,rotational spectroscopy ,Formaldehyde ,fluorine ,0103 physical sciences ,23 Química ,Molecule ,Lone pair ,ComputingMilieux_MISCELLANEOUS ,chemistry.chemical_classification ,[PHYS]Physics [physics] ,010304 chemical physics ,molecular adduct ,Full Paper ,molecular adducts ,010405 organic chemistry ,pi-hole interactions ,Organic Chemistry ,General Chemistry ,Fluorine ,Full Papers ,3. Good health ,0104 chemical sciences ,Crystallography ,chemistry ,non-covalent interactions ,pi-hole interaction - Abstract
Producción Científica, The rotational spectrum of the weakly bound complex pentafluoropyridineꞏꞏꞏformaldehyde has been investigated using Fourier transform microwave spectroscopy. From the analysis of the rotational parameters of the parent species and of the 13C and 15N isotopologues, the structural arrangement of the adduct has been unambiguously established. The full ring fluorination of pyridine has a dramatic effect on its binding properties: It alters the electron density distribution at the π-cloud of pyridine creating a π-hole and changing its electron donor-acceptor capabilities. In the complex, formaldehyde lies above the aromatic ring with one of the oxygen lone pairs, as conventionally envisaged, pointing toward its centre. This lone pairꞏꞏꞏπ-hole interaction, reinforced by a weak C-HꞏꞏꞏN interaction, indicates an exchange of the electron-acceptor roles of both molecules when compared to the pyridineꞏꞏꞏformaldehyde adduct. Tunnelling doublets due to the internal rotation of formaldehyde have also been observed and analysed leading to a discussion on the competition between lone pairꞏꞏꞏπ-hole and π ꞏꞏꞏπ staking interactions., Ministerio de Economía y Competitividad (grant CTQ2016-75253-P), Ministerio de Ciencia, Innovación y Universidades de España (project PGC2018-094644-B-C22), Comunidad Autónoma de Madrid (grant P2018 / EMT-4329 AIRTEC-CM)
- Published
- 2021
- Full Text
- View/download PDF
5. Nouvelles approches de marquage au fluor 18 et développement d'un radiotraceur pour l'imagerie TEP en oncologie
- Author
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Pelletier, Rémi, Laboratoire d’imagerie biomédicale multimodale [Orsay] (BioMaps), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay, Bertrand Kühnast, LaBoratoire d'Imagerie biOmédicale MultimodAle Paris-Saclay (BIOMAPS), Service Hospitalier Frédéric Joliot (SHFJ), Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), and STAR, ABES
- Subjects
[CHIM.ORGA]Chemical Sciences/Organic chemistry ,Aromatic fluorination ,Fluor 18 ,Molecular imaging ,[CHIM.ORGA] Chemical Sciences/Organic chemistry ,Binimetinib ,Fluorine-18 ,PET ,TEP ,[CHIM.RADIO] Chemical Sciences/Radiochemistry ,Imagerie moléculaire ,Fluoration aromatique ,Bore ,[CHIM.RADIO]Chemical Sciences/Radiochemistry ,Boron - Abstract
PET is a medical imaging technique that uses positron-emitting radioactive atoms. One of the most common isotope used for PET imaging isfluorine-18, but the low reactivity of [¹⁸F]fluoride anion is still associated with labelling issues of some specific compounds. The introduction of fluorine on a non-activated aromatic ring remains a radiosynthesis challenge, limiting the development of radiotracers involving such scaffold. The first part of this work deals with the development of new strategies of radiofluorination using boron,known to have a high affinity with fluorine. Two approaches have been studied. The first one is based on the use of a boron atom to guide aromatic fluorination through a concerted nucleophilic aromatic substitution. The second one was the use of the fluorophilic borylated compounds aiming to tranfer aqueous [¹⁸F]fluorides anions produced in the cyclotron to an organic solvent to eliminate drying steps of the [¹⁸F]fluorides usually required. The second part of this work describes the radiolabeling of binimetinib, a drug prescribed for the treatment of BRAF mutant melanomas. Binimetinib is an inhibitor of the MAPK enzyme carrying two fluorine atoms. Beyond the challenge of [¹⁸F]binimetinib synthesis, this compound could be a key for the stratification of patients suffering from cancers involving specific mutations deregulating the RAS signalling pathway involved in cell survival and proliferation mechanism., La Tomographie par Émission de positons (TEP) est une technique d'imagerie médicale utilisant des atomes radioactifs émetteurs de positons. Un des principaux isotopes utilisés en TEP est le fluor 18, qui présente encore aujourd'hui des difficultés pour le marquage de certains composés compte tenu de la faible réactivité de l'anion [¹⁸F]fluorure. En particulier, l'introduction de fluor sur un noyau aromatique non activé reste un défi de radiosynthèse, limitant le développement de radiotraceurs comportant ce motif. La première partie de ces travaux est consacrée au développement de nouvelles stratégies de radiofluoration basées sur l’utilisation du bore qui possède une forte affinité pour le fluor. Deux approches ont en particulier été étudiées. La première a consisté à utiliser un atome de bore afin de diriger la fluoration aromatique et de réaliser une substitution nucléophile aromatique concertée. La seconde a été la mise en œuvre des composés borylés fluorophiles pour le transfert des [¹⁸F]fluorures aqueux produits par le cyclotron vers un solvant organique dans le but de s’affranchir des étapes de préparation et de séchage des [¹⁸F]fluorures classiquement requises. La seconde partie de ces travaux est consacrée au radiomarquage isotopique du binimetinib, un médicament pour le traitement des mélanomes BRAF mutants. Le binimetinib est un inhibiteur de l'enzyme MAPK présentant deux atomes de fluor. Au-delà du défi qu’a représenté la synthèse du [¹⁸F]binimetinib, cette molécule pourrait être un outil clef pour la stratification des populations de patients atteints de cancers mettant en jeu des mutations spécifiques entraînant la dérégulation de la voie de signalisation RAS, impliquée dans la survie et la prolifération cellulaire.
- Published
- 2020
6. A novel improvement in ArLPdF catalytic fluorination of aromatic compounds
- Author
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Samant, Bhupesh S. and Bhagwat, Sunil S.
- Subjects
- *
FLUORINATION , *AROMATIC compounds , *REVERSED micelles , *PHOSPHINE , *LIGANDS (Biochemistry) , *CHEMICAL reactions , *ARGON , *ANISOTROPY , *CATALYSTS - Abstract
Abstract: In this study, we used reverse micellar medium for overcoming the disadvantages of ArLMF catalytic fluorination of aromatic compounds. It not only enhanced the fluorination rate, but also widened the scope of reaction for bromoaromatics with electron donating and withdrawing functionalities at ortho position. Various bromoaromatic compounds were fluorinated using the biarylphosphine ligand i.e. cyclohexyl BrettPhos ligand, along with [cinnamylPdCl]2, and CsF as the fluoride source in reverse micellar media. The anisotropic palisade layer of reverse micelles provided the active site for reaction. The most crucial factor in the critical reductive elimination step could be the spatial orientation of ArLPdF complex in the palisade layer; forming ArF as the final product in high yield with excellent selectivity. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
7. QM/MM and molecular dynamics simulation of the structure and dissociation of CuF in acetonitrile solvent.
- Author
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Pliego Jr, Josefredo R.
- Subjects
- *
MOLECULAR dynamics , *ACETONITRILE , *SOLVATION , *ION pairs , *SOLVENTS , *TRANSITION metals - Abstract
[Display omitted] • Easy dissociation of copper(I) fluoride ion pair in acetonitrile. • Nonbonded force field for Cu+ ion in acetonitrile. • The force field cannot describe ligand effect on the CuF dissociation. • QM/MM calculations needs a large region for copper(I) transition metal. The coordination structure and stability of the CuF species in acetonitrile solution was investigated by QM/MM, molecular dynamics and cluster-continuum methods. Different QM regions were used, such as CuF, CuF(CH 3 CN) 3 and CuF(CH 3 CN) 4. The use of the small QM region indicates a good stability of the CuF ion pair towards dissociation, with pentacoordinated Cu(I) in the CuF(CH 3 CN) 4 species. However, turning 4 acetonitrile molecules in the first solvation shell to the quantum mechanical level in the molecular dynamics simulation leads to the formation of tricoordinated Cu(I) ion, either Cu+(CH 3 CN) 3 or CuF(CH 3 CN) 2 species, indicating an easy dissociation of CuF in solution. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
8. New approaches for fluorine-18 labeling and development of a radiotracer for PET imaging in oncology
- Author
-
Pelletier, Rémi, STAR, ABES, LaBoratoire d'Imagerie biOmédicale MultimodAle Paris-Saclay (BIOMAPS), Service Hospitalier Frédéric Joliot (SHFJ), Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay, and Bertrand Kühnast
- Subjects
[CHIM.ORGA]Chemical Sciences/Organic chemistry ,Aromatic fluorination ,Fluor 18 ,Molecular imaging ,Binimetinib ,[CHIM.ORGA] Chemical Sciences/Organic chemistry ,Fluorine-18 ,PET ,TEP ,Imagerie moléculaire ,[CHIM.RADIO] Chemical Sciences/Radiochemistry ,Fluoration aromatique ,Bore ,[CHIM.RADIO]Chemical Sciences/Radiochemistry ,Boron - Abstract
PET is a medical imaging technique that uses positron-emitting radioactive atoms. One of the most common isotope used for PET imaging isfluorine-18, but the low reactivity of [¹⁸F]fluoride anion is still associated with labelling issues of some specific compounds. The introduction of fluorine on a non-activated aromatic ring remains a radiosynthesis challenge, limiting the development of radiotracers involving such scaffold. The first part of this work deals with the development of new strategies of radiofluorination using boron,known to have a high affinity with fluorine. Two approaches have been studied. The first one is based on the use of a boron atom to guide aromatic fluorination through a concerted nucleophilic aromatic substitution. The second one was the use of the fluorophilic borylated compounds aiming to tranfer aqueous [¹⁸F]fluorides anions produced in the cyclotron to an organic solvent to eliminate drying steps of the [¹⁸F]fluorides usually required. The second part of this work describes the radiolabeling of binimetinib, a drug prescribed for the treatment of BRAF mutant melanomas. Binimetinib is an inhibitor of the MAPK enzyme carrying two fluorine atoms. Beyond the challenge of [¹⁸F]binimetinib synthesis, this compound could be a key for the stratification of patients suffering from cancers involving specific mutations deregulating the RAS signalling pathway involved in cell survival and proliferation mechanism., La Tomographie par Émission de positons (TEP) est une technique d'imagerie médicale utilisant des atomes radioactifs émetteurs de positons. Un des principaux isotopes utilisés en TEP est le fluor 18, qui présente encore aujourd'hui des difficultés pour le marquage de certains composés compte tenu de la faible réactivité de l'anion [¹⁸F]fluorure. En particulier, l'introduction de fluor sur un noyau aromatique non activé reste un défi de radiosynthèse, limitant le développement de radiotraceurs comportant ce motif. La première partie de ces travaux est consacrée au développement de nouvelles stratégies de radiofluoration basées sur l’utilisation du bore qui possède une forte affinité pour le fluor. Deux approches ont en particulier été étudiées. La première a consisté à utiliser un atome de bore afin de diriger la fluoration aromatique et de réaliser une substitution nucléophile aromatique concertée. La seconde a été la mise en œuvre des composés borylés fluorophiles pour le transfert des [¹⁸F]fluorures aqueux produits par le cyclotron vers un solvant organique dans le but de s’affranchir des étapes de préparation et de séchage des [¹⁸F]fluorures classiquement requises. La seconde partie de ces travaux est consacrée au radiomarquage isotopique du binimetinib, un médicament pour le traitement des mélanomes BRAF mutants. Le binimetinib est un inhibiteur de l'enzyme MAPK présentant deux atomes de fluor. Au-delà du défi qu’a représenté la synthèse du [¹⁸F]binimetinib, cette molécule pourrait être un outil clef pour la stratification des populations de patients atteints de cancers mettant en jeu des mutations spécifiques entraînant la dérégulation de la voie de signalisation RAS, impliquée dans la survie et la prolifération cellulaire.
- Published
- 2020
9. Aromatic Fluorination of Multiblock Amphiphile Enhances Its Incorporation into Lipid Bilayer Membranes
- Author
-
Kohei Sato, Ryo Sasaki, and Kazushi Kinbara
- Subjects
endocrine system ,Absorption spectroscopy ,aromatic fluorination ,Supramolecular chemistry ,010402 general chemistry ,01 natural sciences ,supramolecular chemistry ,lcsh:Chemistry ,multiblock amphiphiles ,Amphiphile ,Lipid bilayer ,lipid bilayer membranes ,Aqueous solution ,010405 organic chemistry ,Chemistry ,urogenital system ,Organic solvent ,Communication ,fungi ,General Chemistry ,self-assembly ,Communications ,0104 chemical sciences ,Membrane ,Chemical engineering ,lcsh:QD1-999 ,lipids (amino acids, peptides, and proteins) ,Self-assembly - Abstract
We designed multiblock amphiphiles AmF and AmH, which consist of perfluorinated and non‐fluorinated hydrophobic units, respectively. Absorption spectroscopy revealed that both amphiphiles are molecularly dispersed in organic solvent, while they form aggregates under aqueous conditions. Furthermore, we investigated whether AmF and AmH can be incorporated into DOPC lipid bilayer membranes, and found that the maximum concentration of AmF that can be incorporated into DOPC lipid bilayer membranes is 43 times higher than that of AmH., A multiblock amphiphile that consists of perfluorinated hydrophobic unit and hydrophilic tetraethylene glycol chains has been prepared. The maximum concentration of the amphiphile that can be incorporated into DOPC lipid bilayer membranes is 43 times higher than that of its non‐fluorinated analogue.
- Published
- 2019
10. Microflow Fluorinations of Benzynes: Efficient Synthesis of Fluoroaromatic Compounds.
- Author
-
Ikawa T, Masuda S, and Akai S
- Subjects
- Halogenation, Hydrocarbons, Fluorinated chemistry, Molecular Structure, Benzene Derivatives chemistry, Flow Injection Analysis, Hydrocarbons, Fluorinated chemical synthesis
- Abstract
Fluorinated aromatic compounds are found in a variety of biologically active compounds, including clinical drugs and agrochemicals. Therefore, the synthesis of aryl fluorides is particularly important in the medicinal and process chemistry fields. In this paper, we report a method for the synthesis of aryl fluorides by benzyne fluorination under microflow conditions using the efficient Comet X-01 micromixer. In comparison to our previously reported method under ordinary batch conditions, this approach facilitates a significant reduction in reaction times, to ca. 10 s, as well as increases in the yields of fluoroarenes (by up to 51%).
- Published
- 2018
- Full Text
- View/download PDF
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