1
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Lindberg A, Vasdev N. Ring-opening of non-activated aziridines with [ 11C]CO 2 via novel ionic liquids. RSC Adv 2022; 12:21417-21421. [PMID: 35975081 PMCID: PMC9345297 DOI: 10.1039/d2ra03966d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 07/14/2022] [Indexed: 11/23/2022] Open
Abstract
Novel ionic liquids based on DBU and DBN halide salts were developed as a catalytic system for ring-opening of non-activated aziridines with [11C]CO2. The ability of ionic liquids to activate aziridines represents a simple methodology for the synthesis of 11C-carbamates and can be extended for CO2-fixation in organic and radiochemistry. Novel ionic liquids based on DBU and DBN halide salts were developed as a catalytic system for ring-opening of non-activated aziridines with [11C]CO2.![]()
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Affiliation(s)
- Anton Lindberg
- Azrieli Centre for Neuro-Radiochemistry, Brain Health Imaging Centre, Centre for Addiction and Mental Health Toronto ON M5T 1R8 Canada
| | - Neil Vasdev
- Azrieli Centre for Neuro-Radiochemistry, Brain Health Imaging Centre, Centre for Addiction and Mental Health Toronto ON M5T 1R8 Canada .,Department of Psychiatry, University of Toronto Toronto ON M5T 1R8 Canada
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2
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Reissig F, Mamat C. Strained Ammonium Precursors for Radiofluorinations. Chemistry 2022; 11:e202200039. [PMID: 35736542 PMCID: PMC9220932 DOI: 10.1002/open.202200039] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 05/24/2022] [Indexed: 12/11/2022]
Abstract
The increasing application of positron emission tomography (PET) in nuclear medicine has stimulated the extensive development of a multitude of novel and versatile techniques to introduce fluorine‐18, especially for the radiolabelling of biologically or pharmacologically active molecules. Taking into consideration that the introduction of fluorine‐18 (t1/2=109.8 min) mostly proceeds under harsh conditions, radiolabelling of such molecules represents a challenge and is of enormous interest. Ideally, it should proceed in a regioselective manner under mild physiological conditions, in an acceptable time span, with high yields and high specific activities. Special attention has been drawn to 2‐fluoroethyl and 3‐fluoropropyl groups, which are often the active sites of radiofluorinated compounds. Precursors containing an ammonium leaving group – such as a strained azetidinium or aziridinium moiety – can help to overcome these obstacles leading to a convenient and mild introduction of [18F]fluoride with high radiochemical yields.
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Affiliation(s)
- Falco Reissig
- Institut für Radiopharmazeutische Krebsforschung Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328, Dresden, Germany.,Fakultät Chemie und Lebensmittelchemie, Technische Universität Dresden, 01062, Dresden, Germany
| | - Constantin Mamat
- Institut für Radiopharmazeutische Krebsforschung Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328, Dresden, Germany.,Fakultät Chemie und Lebensmittelchemie, Technische Universität Dresden, 01062, Dresden, Germany
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3
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Scroggie KR, Perkins MV, Chalker JM. Reaction of [ 18F]Fluoride at Heteroatoms and Metals for Imaging of Peptides and Proteins by Positron Emission Tomography. Front Chem 2021; 9:687678. [PMID: 34249861 PMCID: PMC8262615 DOI: 10.3389/fchem.2021.687678] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 06/07/2021] [Indexed: 12/11/2022] Open
Abstract
The ability to radiolabel proteins with [18F]fluoride enables the use of positron emission tomography (PET) for the early detection, staging and diagnosis of disease. The direct fluorination of native proteins through C-F bond formation is, however, a difficult task. The aqueous environments required by proteins severely hampers fluorination yields while the dry, organic solvents that promote nucleophilic fluorination can denature proteins. To circumvent these issues, indirect fluorination methods making use of prosthetic groups that are first fluorinated and then conjugated to a protein have become commonplace. But, when it comes to the radiofluorination of proteins, these indirect methods are not always suited to the short half-life of the fluorine-18 radionuclide (110 min). This review explores radiofluorination through bond formation with fluoride at boron, metal complexes, silicon, phosphorus and sulfur. The potential for these techniques to be used for the direct, aqueous radiolabeling of proteins with [18F]fluoride is discussed.
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Affiliation(s)
| | | | - Justin M. Chalker
- Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Adelaide, SA, Australia
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4
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Basuli F, Zhang X, Phelps TE, Jagoda EM, Choyke PL, Swenson RE. Automated Synthesis of Fluorine-18 Labeled CXCR4 Ligand via the Conjugation with Nicotinic Acid N-Hydroxysuccinimide Ester (6-[ 18F]SFPy). Molecules 2020; 25:E3924. [PMID: 32867358 PMCID: PMC7504725 DOI: 10.3390/molecules25173924] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 08/18/2020] [Accepted: 08/25/2020] [Indexed: 12/13/2022] Open
Abstract
The C-X-C motif chemokine receptor 4 (CXCR4) is a seven-transmembrane G protein-coupled receptor that is overexpressed in numerous diseases, particularly in various cancers and is a powerful chemokine, attracting cells to the bone marrow niche. Therefore, CXCR4 is an attractive target for imaging and therapeutic purposes. The goal of this study is to develop an efficient, reproducible, and straightforward method to prepare a fluorine-18 labeled CXCR4 ligand. 6-[18F]Fluoronicotinic acid-2,3,5,6-tetrafluorophenyl ester (6-[18F]FPy-TFP) and nicotinic acid N-hydroxysuccinimide ester (6-[18F]SFPy) have been prepared using 'fluorination on the Sep-Pak' method. Conjugation of 6-[18F]SFPy or 6-[18F]FPy-TFP with the alpha-amino group at the N terminus of the protected T140 precursor followed by deprotection, yielded the final product 6-[18F]FPy-T140. The overall radiochemical yields were 6-17% (n = 15, decay-corrected) in a 90-min radiolabeling time with a radiochemical purity >99%. 6-[18F]FPy-T140 exhibited high specific binding and nanomolar affinity for CXCR4 in vitro, indicating that the biological activity of the peptide was preserved. For the first time, [18F]SFPy has been prepared using 'fluorination on the Sep-Pak' method that allows rapid automated synthesis of 6-[18F]FPy-T140. In addition to increased synthetic efficiency, this construct binds with CXCR4 in high affinity and may have potential as an in vivo positron emission tomography (PET) imaging agent. This radiosynthesis method should encourage wider use of this PET agent to quantify CXCR4 in both research and clinical settings.
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Affiliation(s)
- Falguni Basuli
- Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD 20892, USA; (X.Z.); (R.E.S.)
| | - Xiang Zhang
- Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD 20892, USA; (X.Z.); (R.E.S.)
| | - Tim E. Phelps
- Molecular Imaging Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA; (T.E.P.); (E.M.J.); (P.L.C.)
| | - Elaine M. Jagoda
- Molecular Imaging Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA; (T.E.P.); (E.M.J.); (P.L.C.)
| | - Peter L. Choyke
- Molecular Imaging Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA; (T.E.P.); (E.M.J.); (P.L.C.)
| | - Rolf E. Swenson
- Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD 20892, USA; (X.Z.); (R.E.S.)
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5
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Hacaperková E, Jaroš A, Kotek J, Notni J, Straka M, Kubíček V, Hermann P. Al( iii)-NTA-fluoride: a simple model system for Al–F binding with interesting thermodynamics. Dalton Trans 2020; 49:13726-13736. [DOI: 10.1039/d0dt02644a] [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
Unsaturated AlIII complex shows a fast exchange of water molecules, hydroxide and fluoride anions in the coordination sphere, highly pH-dependent fluoride binding and release of fluorides at high pH or at high phosphate anion concentrations.
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Affiliation(s)
- Eliška Hacaperková
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Adam Jaroš
- Institute of Organic Chemistry and Biochemistry
- AS CR
- 166 10 Prague
- Czech Republic
| | - Jan Kotek
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Johannes Notni
- Institut für Pathologie und Pathologische Anatomie
- Technische Universität München
- 81675 München
- Germany
| | - Michal Straka
- Institute of Organic Chemistry and Biochemistry
- AS CR
- 166 10 Prague
- Czech Republic
| | - Vojtěch Kubíček
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
| | - Petr Hermann
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 40 Prague
- Czech Republic
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6
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Ivanova J, Štrumfs B, Žalubovskis R. Access to NH-aziridine-2-carboxamides through Davidsen acylimidodicarbonate activation. CR CHIM 2019. [DOI: 10.1016/j.crci.2019.03.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Collet C, Vucko T, Ariztia J, Karcher G, Pellegrini-Moïse N, Lamandé-Langle S. Fully automated radiosynthesis of [ 18F]fluoro- C-glyco-c(RGDfC): exploiting all the abilities of the AllInOne synthesizer. REACT CHEM ENG 2019. [DOI: 10.1039/c9re00303g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Fully automated and modular radiosynthesis of [18F]fluoro-C-glyco-RGD conjugate.
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Affiliation(s)
- Charlotte Collet
- NancycloTEP
- F-54511 Vandoeuvre-lès-Nancy
- France
- Université de Lorraine
- INSERM
| | | | | | - Gilles Karcher
- NancycloTEP
- F-54511 Vandoeuvre-lès-Nancy
- France
- Département de Médecine Nucléaire
- CHRU-Nancy
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8
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Alluri SR, Riss PJ. Stereospecific radiosynthesis of 3-fluoro amino acids: access to enantiomerically pure radioligands for positron emission tomography. Org Biomol Chem 2018; 16:2219-2224. [PMID: 29546903 DOI: 10.1039/c8ob00184g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A variety of substituted non-racemic aziridine-2-carboxylates equivalent to amino acids were prepared and subjected to ring opening reaction by [18F/19F]fluoride. The regio and stereospecific ring opening depends on the substituents on the nitrogen as well as both the carbons of aziridines. The applicability of the methods to afford access to 3-[18F/19F]fluoro amino acids are illustrated.
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Affiliation(s)
- Santosh R Alluri
- Realomics Strategic Research Initiative, Department of Chemistry, University of Oslo, Sem salands vei 26, 0374, Oslo, Norway.
| | - Patrick J Riss
- Realomics Strategic Research Initiative, Department of Chemistry, University of Oslo, Sem salands vei 26, 0374, Oslo, Norway. and Norsk Medisinsk Syklotron AS, Nydalen, Oslo, Norway and Klinikk for Kirugi og Nevrofag, Oslo Universitet Sykehus HF-Rikshopitalet, Nydalen, Oslo, Norway
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9
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Krishnan HS, Ma L, Vasdev N, Liang SH. 18 F-Labeling of Sensitive Biomolecules for Positron Emission Tomography. Chemistry 2017; 23:15553-15577. [PMID: 28704575 PMCID: PMC5675832 DOI: 10.1002/chem.201701581] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Indexed: 12/21/2022]
Abstract
Positron emission tomography (PET) imaging study of fluorine-18 labeled biomolecules is an emerging and rapidly growing area for preclinical and clinical research. The present review focuses on recent advances in radiochemical methods for incorporating fluorine-18 into biomolecules via "direct" or "indirect" bioconjugation. Recently developed prosthetic groups and pre-targeting strategies, as well as representative examples in 18 F-labeling of biomolecules in PET imaging research studies are highlighted.
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Affiliation(s)
- Hema S. Krishnan
- Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Longle Ma
- Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Neil Vasdev
- Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
| | - Steven H. Liang
- Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital & Department of Radiology, Harvard Medical School, Boston, MA, 02114, USA
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10
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Wiemer J, Steinbach J, Pietzsch J, Mamat C. Preparation of a novel radiotracer targeting the EphB4 receptor via radiofluorination using spiro azetidinium salts as precursor. J Labelled Comp Radiopharm 2017; 60:489-498. [DOI: 10.1002/jlcr.3526] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 05/10/2017] [Accepted: 05/29/2017] [Indexed: 12/26/2022]
Affiliation(s)
- Jens Wiemer
- Institut für Radiopharmazeutische Krebsforschung; Helmholtz-Zentrum Dresden-Rossendorf; Dresden Germany
| | - Jörg Steinbach
- Institut für Radiopharmazeutische Krebsforschung; Helmholtz-Zentrum Dresden-Rossendorf; Dresden Germany
- Fachbereich Chemie und Lebensmittelchemie; Technische Universität Dresden; Dresden Germany
| | - Jens Pietzsch
- Institut für Radiopharmazeutische Krebsforschung; Helmholtz-Zentrum Dresden-Rossendorf; Dresden Germany
- Fachbereich Chemie und Lebensmittelchemie; Technische Universität Dresden; Dresden Germany
| | - Constantin Mamat
- Institut für Radiopharmazeutische Krebsforschung; Helmholtz-Zentrum Dresden-Rossendorf; Dresden Germany
- Fachbereich Chemie und Lebensmittelchemie; Technische Universität Dresden; Dresden Germany
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11
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Basuli F, Zhang X, Woodroofe CC, Jagoda EM, Choyke PL, Swenson RE. Fast indirect fluorine-18 labeling of protein/peptide using the useful 6-fluoronicotinic acid-2,3,5,6-tetrafluorophenyl prosthetic group: A method comparable to direct fluorination. J Labelled Comp Radiopharm 2017; 60:168-175. [PMID: 27990672 PMCID: PMC5344719 DOI: 10.1002/jlcr.3487] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 12/01/2016] [Accepted: 12/06/2016] [Indexed: 12/20/2022]
Abstract
Fluorine-18 labeling of biomolecules is mostly performed by an indirect labeling method using a prosthetic group. Fluorine-18 labeled 6-fluoronicotinic acid-2,3,5,6-tetrafluorophenyl ester is a useful prosthetic group to radiolabel a protein. Recently, we reported an improved preparation of this prosthetic group. To test the conjugation efficiency of the labeled ester prepared by this method, we have performed conjugation reactions with a peptide, a protein, and a small molecule. Prostate-specific membrane antigen targeting small molecule [18 F]DCFPyL, αvβ3 integrin receptors targeting peptide [18 F]c(RGDfK) and [18 F]albumin were prepared in good radiochemical yields. The conjugation reactions were completed at 40°C to 50°C in 10 minutes. The overall radiochemical yield was 25% to 43% in 30 to 45 minutes.
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Affiliation(s)
- Falguni Basuli
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD, USA
| | - Xiang Zhang
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD, USA
| | - Carolyn C Woodroofe
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD, USA
| | - Elaine M Jagoda
- Molecular Imaging Program, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Peter L Choyke
- Molecular Imaging Program, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Rolf E Swenson
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD, USA
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12
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Médoc M, Sobrio F. Nucleophilic Fluorination and Radiofluorination via Aziridinium Intermediates: N-Substituent Influence, Unexpected Regioselectivity, and Differences between Fluorine-19 and Fluorine-18. J Org Chem 2015; 80:10086-97. [PMID: 26406157 DOI: 10.1021/acs.joc.5b01714] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The efficient dehydrofluorination and radiofluorination of N,N-disubstituted-β-aminoalcohols through an anchimeric-assisted mechanism was developed. An investigation into the influence of N-substituents on the ring opening of the aziridinium intermediate indicated differences in the isomeric ratio and the yields of fluorinated products obtained from N,N-disubstituted-phenylalaninol. This influence was substantial for (18)F-radiofluorination, with yields varying from 0 to 71% at room temperature (RT). Although no significant effects were observed in the fluorine-19 chemistry when the reaction was heated to 90 °C, considerable changes appeared during radiofluorination. In the latter case, the radiochemical yields increased, and degradation of the 2-fluoro-propan-1-amine isomer (b) occurred, leading to a regiospecific reaction in the radiolabeling of [(18)F]-fluorodeprenyl. This method involving nucleophilic radiofluorination at RT was successfully applied to the radiolabeling of [(18)F]-2-fluoroethylamines in which the influence of the N-substituent was also observed.
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Affiliation(s)
- Marie Médoc
- CEA, I2BM, LDM-TEP, UMR 6301 ISTCT , F-14074 Caen, France.,Centre National de la Recherche Scientifique, UMR 6301 ISTCT, LDM-TEP , F-14074 Caen, France.,UNICAEN, UMR 6301 ISTCT, LDM-TEP, GIP Cyceron , BP5229, F-14074 Caen, France
| | - Franck Sobrio
- CEA, I2BM, LDM-TEP, UMR 6301 ISTCT , F-14074 Caen, France.,Centre National de la Recherche Scientifique, UMR 6301 ISTCT, LDM-TEP , F-14074 Caen, France.,UNICAEN, UMR 6301 ISTCT, LDM-TEP, GIP Cyceron , BP5229, F-14074 Caen, France
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13
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Schjoeth-Eskesen C, Hansen PR, Kjaer A, Gillings N. Efficient regioselective ring opening of activated aziridine-2-carboxylates with [(18)f]fluoride. ChemistryOpen 2015; 4:65-71. [PMID: 25861572 PMCID: PMC4380955 DOI: 10.1002/open.201402081] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Indexed: 11/23/2022] Open
Abstract
Aziridines can undergo a range of ring-opening reactions with nucleophiles. The regio- and stereochemistry of the products depend on the substituents on the aziridine. Aziridine ring-opening reactions have rarely been used in radiosynthesis. Herein we report the ring opening of activated aziridine-2-carboxylates with [18F]fluoride. The aziridine was activated for nucleophilic attack by substitution of various groups on the aziridine nitrogen atom. Fluorine-18 radiolabelling was followed by ester hydrolysis and removal of the activation group. Totally regioselective ring opening and subsequent deprotection was achieved with tert-butyloxycarbonyl- and carboxybenzyl-activated aziridines to give α-[18F]fluoro-β-alanine in good radiochemical yield.
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Affiliation(s)
- Christina Schjoeth-Eskesen
- Department of Clinical Physiology, Nuclear Medicine & PET, Copenhagen University Hospital Rigshospitalet Blegdamsvej 9, 2100 Copenhagen Ø (Denmark) ; Department of Clinical Physiology, Nuclear Medicine & PET, Copenhagen University Hospital Rigshospitalet Blegdamsvej 9, 2100 Copenhagen Ø (Denmark)
| | - Paul Robert Hansen
- Department of Drug Design & Pharmacology, University of Copenhagen Universitetsparken 2, 2100 Copenhagen Ø (Denmark)
| | - Andreas Kjaer
- Department of Clinical Physiology, Nuclear Medicine & PET, Copenhagen University Hospital Rigshospitalet Blegdamsvej 9, 2100 Copenhagen Ø (Denmark) ; Cluster for Molecular Imaging, Faculty of Health Sciences, University of Copenhagen Blegdamsvej 3B, 2100 Copenhagen Ø (Denmark)
| | - Nic Gillings
- Department of Clinical Physiology, Nuclear Medicine & PET, Copenhagen University Hospital Rigshospitalet Blegdamsvej 9, 2100 Copenhagen Ø (Denmark)
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14
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Samimi HA, Salehi E, Dadvar F. N-bromosuccinimide/cerium Ammonium Nitrate: An Efficient Reagent for Stereo-controlled Deamination of Ketoaziridines. JOURNAL OF CHEMICAL RESEARCH 2014. [DOI: 10.3184/174751914x14176157994656] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An efficient and novel method for the deamination of trans-1-alkyl (H or benzoyl)-2-aroyl aziridines in a completely stereo-controlled reaction in the presence of N-bromosuccinimide/cerium (IV) ammonium nitrate is described. In comparison with the previous reported work, this reaction reveals a substituent-reactivity relationship and important role for the substituent on C1 and C2 in determining whether deamination or oxidation reaction takes place.
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Affiliation(s)
- Heshmat Allah Samimi
- Department of Chemistry, Faculty of Sciences, Shahrekord University, PO Box 115, Shahrekord, Iran
| | - Elham Salehi
- Department of Chemistry, Faculty of Sciences, Shahrekord University, PO Box 115, Shahrekord, Iran
| | - Farkhondeh Dadvar
- Department of Chemistry, Faculty of Sciences, Shahrekord University, PO Box 115, Shahrekord, Iran
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15
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Médoc M, Sobrio F. Nucleophilic radiofluorination at room temperature via aziridinium intermediates. RSC Adv 2014. [DOI: 10.1039/c4ra07158a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
2-Fluoroamines were synthesized at RT from alcohols with different sources of nucleophilic [18F]- or [19F]-fluoride.
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Affiliation(s)
- M. Médoc
- CEA
- I2BM
- LDM-TEP
- UMR 6301 ISTCT
- F-14074 Caen, France
| | - F. Sobrio
- CEA
- I2BM
- LDM-TEP
- UMR 6301 ISTCT
- F-14074 Caen, France
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16
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Samimi HA, Kiyani H, Shams Z. Stereo-controlled Deamination of Ketoaziridines Using Ph3P/I2. JOURNAL OF CHEMICAL RESEARCH 2013. [DOI: 10.3184/174751913x13646666428217] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PPh3/I2 is an efficient reagent for the stereo-controlled deamination of non-activated aziridines, N–H and N-alkyl aziridines, using. The method works gives the corresponding trans-alkenes from both cis and trans-aziridines. A plausible mechanism is proposed for the ring opening and deamination of keto-aziridines in the presence of Ph3P/I2.
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Affiliation(s)
- Heshmat Allah Samimi
- Department of Chemistry, Faculty of Sciences, Shahrekord University, PO Box 115, Shahrekord, Iran
| | - Hamzeh Kiyani
- School of Chemistry, Damghan University, Damghan, 36715-364, Iran
| | - Zahra Shams
- Department of Chemistry, Faculty of Sciences, Shahrekord University, PO Box 115, Shahrekord, Iran
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17
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Li XG, Haaparanta M, Solin O. Oxime formation for fluorine-18 labeling of peptides and proteins for positron emission tomography (PET) imaging: A review. J Fluor Chem 2012. [DOI: 10.1016/j.jfluchem.2012.07.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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18
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One-step 18F-labeling of peptides for positron emission tomography imaging using the SiFA methodology. Nat Protoc 2012; 7:1946-55. [DOI: 10.1038/nprot.2012.109] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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19
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Samimi HA, Shams Z, Momeni AR. Deamination of cis and trans-aziridines using diethyl thiourea and iodine. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2012. [DOI: 10.1007/s13738-012-0094-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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20
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Amigues E, Schulz J, Szlosek-Pinaud M, Fernandez P, Silvente-Poirot S, Brillouet S, Courbon F, Fouquet E. [18F]Si-RiboRGD: From Design and Synthesis to the Imaging of αvβ3 Integrins in Melanoma Tumors. Chempluschem 2012. [DOI: 10.1002/cplu.201200022] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Basuli F, Wu H, Shi ZD, Teng B, Li C, Sulima A, Bate A, Young P, McMillan M, Griffiths GL. Synthesis of ApoSense compound [18F]2-(5-(dimethylamino)naphthalene-1-sulfonamido)-2-(fluoromethyl)butanoic acid ([18F]NST732) by nucleophilic ring opening of an aziridine precursor. Nucl Med Biol 2012; 39:687-96. [PMID: 22336374 DOI: 10.1016/j.nucmedbio.2011.12.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2011] [Revised: 12/01/2011] [Accepted: 12/09/2011] [Indexed: 01/22/2023]
Abstract
INTRODUCTION The small molecule 2-(5-(dimethylamino)naphthalene-1-sulfonamido)-2-(fluoromethyl)butanoic acid (NST732) is a member of the ApoSense family of compounds, capable of selective targeting, binding and accumulation within cells undergoing apoptotic cell death. It has application in molecular imaging and blood clotting particularly for monitoring antiapoptotic drug treatments. We are investigating a fluorine-18-radiolabeled analog of this compound for positron emission tomography studies. METHODS We prepared the tosylate precursor methyl 2-(5-(dimethylamino)naphthalene-1-sulfonamido)-2-(tosyloxymethyl)butanoate (4) to synthesize fluorine-18-labeled NST732. Fluorination reaction of the tosylate precursor in 1:1 acetonitrile:dimethylsulfoxide with tetrabutyl ammonium fluoride proceeds through an aziridine intermediate (4A) to afford two regioisomers: 2-(5-(dimethylamino)naphthalene-1-sulfonamido)-2-fluorobutanoate (5) and methyl 2-(5-(dimethylamino)naphthalene-1-sulfonamido)-2-(fluoromethyl)butanoate (6). Acid hydrolysis of the fluoromethylbutanoate (6) isomer produced NST732. As the fluorination reaction of the tosylate precursor proceeds through an aziridine intermediate (4A) and the fluorination conceivably could be done directly on the aziridine, we have separately prepared an aziridine precursor (4A). Fluorine-18 labeling of the aziridine precursor (4A) was performed with [(18)F]tetrabutyl ammonium fluoride to afford the same two regioisomers (5 and 6). The [18F]2-((5-dimethylamino)naphthalene-1-sulfonamido)methyl)-2-fluorobutanoic acid (NST732) was then obtained by the hydrolysis of corresponding [18F]-labeled ester (6) with 6 N hydrochloric acid. RESULTS Two regioisomers obtained from the fluorination reaction of aziridine were easily separated by high-performance liquid chromatography. The total radiochemical yield was 15%±3% (uncorrected, n=18) from the aziridine precursor in a 70-min synthesis time with a radiochemical purity>99%. CONCLUSION Fluorine-18-labeled ApoSense compound [18F]NST732 is prepared in moderate yield by direct fluorination of an aziridine precursor.
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Affiliation(s)
- Falguni Basuli
- Imaging Probe Development Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Rockville, MD 20850, USA.
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Priem T, Bouteiller C, Camporese D, Romieu A, Renard PY. Synthesis and reactivity of a bis-sultone cross-linker for peptideconjugation and [18F]-radiolabelling via unusual “double click” approach. Org Biomol Chem 2012; 10:1068-78. [DOI: 10.1039/c1ob06600e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Carberry P, Carpenter AP, Kung HF. Fluoride-18 radiolabeling of peptides bearing an aminooxy functional group to a prosthetic ligand via an oxime bond. Bioorg Med Chem Lett 2011; 21:6992-5. [PMID: 22024031 DOI: 10.1016/j.bmcl.2011.09.124] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Revised: 09/26/2011] [Accepted: 09/28/2011] [Indexed: 11/27/2022]
Abstract
We have developed a novel F-18 prosthetic ligand named fluoro-PEG-benzaldehyde (FPBA) 1. [(18)F]-FPBA 1 is formed in situ from its radiolabeled precursor [(18)F]6. Compound 6 is efficiently synthesized in four steps starting from commercially available 6-bromo-3-pyridine carbaldehyde 2. [(18)F]-FPBA was evaluated as a prosthetic ligand to radiolabel three cyclic peptides bearing an aminooxy functional group at the N-terminus position. Acetal [(18)F]6 is purified by either solid-phase extraction (SPE) or reverse-phase HPLC with the overall radiochemical yields (RCY) and radiochemical purity (RCP) in very close agreement. The SPE purification process has the advantage of shorter reaction times (71-87 min for entire reaction sequence), while the use of the reverse-phase HPLC purification process allows the use of up to fifty times less of the expensive synthetic peptides (~ 50 nmol) in the oxime coupling reaction. We have demonstrated an efficient methodology in the production of [(18)F]-FPBA 1 and demonstrated its use as a prosthetic ligand for the labeling of peptides possessing an aminooxy functional group.
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Affiliation(s)
- Patrick Carberry
- Department of Radiology, University of Pennsylvania, Philadelphia, PA 19104, USA
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Stanković S, D'hooghe M, Catak S, Eum H, Waroquier M, Van Speybroeck V, De Kimpe N, Ha HJ. Regioselectivity in the ring opening of non-activated aziridines. Chem Soc Rev 2011; 41:643-65. [PMID: 21894345 DOI: 10.1039/c1cs15140a] [Citation(s) in RCA: 354] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this critical review, the ring opening of non-activated 2-substituted aziridines via intermediate aziridinium salts will be dealt with. Emphasis will be put on the relationship between the observed regioselectivity and inherent structural features such as the nature of the C2 aziridine substituent and the nature of the electrophile and the nucleophile. This overview should allow chemists to gain insight into the factors governing the regioselectivity in aziridinium ring openings (81 references).
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Affiliation(s)
- Sonja Stanković
- Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
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Alpha selective epoxide opening with 18F−: synthesis of 4-(3-[18F]fluoro-2-hydroxypropoxy)benzaldehyde ([18F]FPB) for peptide labeling. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.02.064] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Jacobson O, Zhu L, Ma Y, Weiss ID, Sun X, Niu G, Kiesewetter DO, Chen X. Rapid and simple one-step F-18 labeling of peptides. Bioconjug Chem 2011; 22:422-8. [PMID: 21338096 DOI: 10.1021/bc100437q] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Labeling biomolecules with ¹⁸F is usually done through coupling with prosthetic groups, which requires several time-consuming radiosynthesis steps and therefore in low labeling yield. In this study, we designed a simple one-step ¹⁸F-labeling strategy to replace the conventional complex and the long process of multiple-step radiolabeling procedure. Both monomeric and dimeric cyclic RGD peptides were modified to contain 4-NO₂-3-CF₃ arene as precursors for direct ¹⁸F labeling. Binding of the two functionalized peptides to integrin α(v)β₃ was tested in vitro using the MDA-MB-435 human breast cell line. The most promising functionalized peptide, the dimeric cyclic RGD, was further evaluated in vivo in an orthotopic MDA-MB-435 tumor xenograft model. The use of relatively low amount of precursor (~0.5 μmol) gave reasonable yield, ranging from 7 to 23% (decay corrected, calculated from the start of synthesis) after HPLC purification. Overall reaction time was 40 min, and the specific activity of the labeled peptide was high. Modification of RGD peptides did not significantly change the biological binding affinities of the modified peptides. Small animal PET and biodistribution studies revealed integrin specific tumor uptake and favorable biokinetics. We have developed a novel one-step ¹⁸F radiolabeling strategy for peptides that contain a specific arene group, which shortens reaction time and labor significantly, requires low amount of precursor, and results in specific activity of 79 ± 13 GBq/μmol. Successful introduction of 4-fluoro-3-trifluoromethylbenzamide into RGD peptides may be a general strategy applicable to other biologically active peptides and proteins.
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Affiliation(s)
- Orit Jacobson
- Laboratory of Molecular Imaging and Nanomedicine (LOMIN), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda, Maryland, USA
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Honer M, Mu L, Stellfeld T, Graham K, Martic M, Fischer CR, Lehmann L, Schubiger PA, Ametamey SM, Dinkelborg L, Srinivasan A, Borkowski S. 18F-labeled bombesin analog for specific and effective targeting of prostate tumors expressing gastrin-releasing peptide receptors. J Nucl Med 2011; 52:270-8. [PMID: 21233180 DOI: 10.2967/jnumed.110.081620] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
UNLABELLED Bombesin is a peptide exhibiting high affinity for the gastrin-releasing peptide receptor (GRPr), which is highly overexpressed on prostate cancer cells. In the present study, we developed an (18)F-labeled bombesin analog, (18)F-BAY 86-4367, which is currently being clinically tested for use in PET of prostate cancer. METHODS In vitro pharmacologic studies were performed to characterize the nonradioactive ((19)F) standard of the bombesin analog for binding affinity and selectivity for GRPr. The stability of (18)F-BAY 86-4367 was determined in murine and human plasma. In vivo, the tumor-targeting potential and pharmacokinetic profile of the (18)F tracer were analyzed with biodistribution experiments and PET studies of prostate tumor-bearing mice. RESULTS The nonradioactive ((19)F) standard of the bombesin analog showed subnanomolar and GRPr-selective binding affinity. The stability of the tracer in murine and human plasma was found to be high. In 2 prostate cancer xenograft models (PC-3 and LNCaP), (18)F-BAY 86-4367 showed more specific and effective GRPr-based targeting in vivo than the benchmark radiotracers (18)F-fluoroethylcholine and (18)F-FDG. In addition, rapid tumor targeting and fast renal excretion (∼70%) and hepatobiliary excretion (∼10%) were identified in both xenograft models. Furthermore, PET studies provided clear and specific visualization of PC-3 tumors in mice. CONCLUSION Favorable preclinical data showing specific and effective tumor targeting by (18)F-BAY 86-4367 suggest that a clinical trial be undertaken to test its diagnostic utility in PET for prostate carcinoma patients.
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Affiliation(s)
- Michael Honer
- Department of Chemistry and Applied Biosciences, Center for Radiopharmaceutical Sciences of ETH, PSI, and USZ, Zurich, Switzerland
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N-(4-(di-tert-butyl[18F]fluorosilyl)benzyl)-2-hydroxy-N,N-dimethylethylammonium bromide ([18F]SiFAN+Br−): A novel lead compound for the development of hydrophilic SiFA-based prosthetic groups for 18F-labeling. J Fluor Chem 2011. [DOI: 10.1016/j.jfluchem.2010.10.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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