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Tupychak MA, Shyyka OY, Pokhodylo NT, Obushak MD. Nitrileimines as an alternative to azides in base-mediated click [3 + 2] cycloaddition with methylene active nitriles. RSC Adv 2020; 10:13696-13699. [PMID: 35493004 PMCID: PMC9051556 DOI: 10.1039/d0ra01417f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 03/20/2020] [Indexed: 12/30/2022] Open
Abstract
Nitrileimines were implemented in practical click protocols with oxopropanenitriles for the straightforward 5-amino-1H-pyrazole synthesis via 1,3-dipolar cycloaddition. The reaction proceeds at room temperature in a short time with base catalysis and no chromatographic purification. High purity products were isolated by simple filtration. The selectivity of the reaction was observed.
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Affiliation(s)
- Mykola A Tupychak
- Department of Organic Chemistry, Ivan Franko National University of Lviv Kyryla i Mefodiya St. 6 Lviv 79005 Ukraine
| | - Olga Ya Shyyka
- Department of Organic Chemistry, Ivan Franko National University of Lviv Kyryla i Mefodiya St. 6 Lviv 79005 Ukraine
| | - Nazariy T Pokhodylo
- Department of Organic Chemistry, Ivan Franko National University of Lviv Kyryla i Mefodiya St. 6 Lviv 79005 Ukraine
| | - Mykola D Obushak
- Department of Organic Chemistry, Ivan Franko National University of Lviv Kyryla i Mefodiya St. 6 Lviv 79005 Ukraine
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2
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Colom M, Vidal B, Zimmer L. Is There a Role for GPCR Agonist Radiotracers in PET Neuroimaging? Front Mol Neurosci 2019; 12:255. [PMID: 31680859 PMCID: PMC6813225 DOI: 10.3389/fnmol.2019.00255] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 10/02/2019] [Indexed: 12/30/2022] Open
Abstract
Positron emission tomography (PET) is a molecular imaging modality that enables in vivo exploration of metabolic processes and especially the pharmacology of neuroreceptors. G protein-coupled receptors (GPCRs) play an important role in numerous pathophysiologic disorders of the central nervous system. Thus, they are targets of choice in PET imaging to bring proof concept of change in density in pathological conditions or in pharmacological challenge. At present, most radiotracers are antagonist ligands. In vitro data suggest that properties differ between GPCR agonists and antagonists: antagonists bind to receptors with a single affinity, whereas agonists are characterized by two different affinities: high affinity for receptors that undergo functional coupling to G-proteins, and low affinity for those that are not coupled. In this context, agonist radiotracers may be useful tools to give functional images of GPCRs in the brain, with high sensitivity to neurotransmitter release. Here, we review all existing PET radiotracers used from animals to humans and their role for understanding the ligand-receptor paradigm of GPCR in comparison with corresponding antagonist radiotracers.
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Affiliation(s)
- Matthieu Colom
- Lyon Neuroscience Research Center, INSERM, CNRS, Université de Lyon, Lyon, France.,CERMEP, Hospices Civils de Lyon, Bron, France
| | - Benjamin Vidal
- Lyon Neuroscience Research Center, INSERM, CNRS, Université de Lyon, Lyon, France
| | - Luc Zimmer
- Lyon Neuroscience Research Center, INSERM, CNRS, Université de Lyon, Lyon, France.,CERMEP, Hospices Civils de Lyon, Bron, France.,Institut National des Sciences et Techniques Nucléaires, CEA Saclay, Gif-sur-Yvette, France
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3
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Altomonte S, Baillie GL, Ross RA, Zanda M. 4-Cyano-5-(2-thiophenyl)-pyrazoles are high affinity CB1 receptor ligands. RSC Adv 2015. [DOI: 10.1039/c4ra17274d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Introduction of a 4-CN group on 5-thiophenyl-pyrazoles afforded high affinity cannabinoid ligands having low nM Ki values and moderate CB1 receptor selectivity. Log P and TPSA values suggest that some of the compounds might be peripherally restricted.
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Affiliation(s)
- Stefano Altomonte
- Kosterlitz Centre for Therapeutics
- Institute of Medical Sciences
- University of Aberdeen
- UK
| | | | - Ruth A. Ross
- Medical Sciences Building
- University of Toronto
- Toronto
- Canada
| | - Matteo Zanda
- Kosterlitz Centre for Therapeutics
- Institute of Medical Sciences
- University of Aberdeen
- UK
- C.N.R.-Istituto di Chimica del Riconoscimento Molecolare
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Zhang P, Hong L, Li G, Wang R. Sodium Halides as Halogenating Reagents: Rhodium(III)-Catalyzed Versatile and Practical Halogenation of Aryl Compounds. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400590] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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5
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Gao M, Gao AC, Wang M, Zheng QH. Synthesis of carbon-11-labeled aminoalkylindole derivatives as new candidates of cannabinoid receptor radioligands for PET imaging of alcohol abuse. Bioorg Med Chem Lett 2014; 24:5581-5586. [DOI: 10.1016/j.bmcl.2014.10.097] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 10/28/2014] [Accepted: 10/30/2014] [Indexed: 11/30/2022]
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6
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Gao M, Xu J, Wang M, Zheng QH. Facile and high-yield synthesis of N-(4-diethylamino)benzyl-4-[¹¹C]methoxy-N-(p-tolyl)benzenesulfonamide as a new potential PET selective CB2 radioligand. Appl Radiat Isot 2014; 90:181-6. [PMID: 24768996 DOI: 10.1016/j.apradiso.2014.03.029] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 03/11/2014] [Accepted: 03/30/2014] [Indexed: 11/20/2022]
Abstract
The reference standard N-(4-diethylamino)benzyl-4-methoxy-N-(p-tolyl)benzenesulfonamide (3c) (CB2, Ki=0.5 nM; CB1, Ki=1297 nM; selectivity CB1/CB2=2594) and its corresponding precursor N-(4-diethylamino)benzyl-4-hydroxy-N-(p-tolyl)benzenesulfonamide (3d) were synthesized from 4-(diethylamino)benzaldehyde and p-toluidine in 3 steps with 75-84% overall chemical yield. The target tracer N-(4-diethylamino)benzyl-4-[(11)C]methoxy-N-(p-tolyl)benzenesulfonamide ([(11)C]3c) was synthesized from the phenol hydroxyl precursor by O-[(11)C]-methylation with [(11)C]CH3OTf, followed by HPLC combined with SPE purification in 40-50% decay corrected radiochemical yields with 370-740 GBq/μmol specific activity at the end of bombardment (EOB).
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Affiliation(s)
- Mingzhang Gao
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, 1345 West 16th Street, L3-202, Indianapolis, IN 46202-2111, USA
| | - Julie Xu
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, 1345 West 16th Street, L3-202, Indianapolis, IN 46202-2111, USA
| | - Min Wang
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, 1345 West 16th Street, L3-202, Indianapolis, IN 46202-2111, USA
| | - Qi-Huang Zheng
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, 1345 West 16th Street, L3-202, Indianapolis, IN 46202-2111, USA.
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Simple synthesis of new carbon-11-labeled 1,2,4-triazolo[4,3-a]quinoxalin-1-one derivatives for PET imaging of A₃ adenosine receptor. Appl Radiat Isot 2014; 91:71-8. [PMID: 24908190 DOI: 10.1016/j.apradiso.2014.05.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 04/29/2014] [Accepted: 05/12/2014] [Indexed: 12/31/2022]
Abstract
The reference standards 4a-b, 6a-b, 7a-c, and desmethylated precursors 9a-b, 10a-b, 8a-c were synthesized from 4-methoxyaniline, ethyl 2-chloro-acetoacetate and substituted benzene-1,2-diamines with 3, 5, 6 steps in 61-67%, 34-41%, 23-31%, and with 4, 6, 7 steps in 49-57%, 28-35%, 20-27% overall chemical yield, respectively. The target tracers [(11)C]4a-b, [(11)C]6a-b, [(11)C]7a-c were synthesized from their corresponding precursors with [(11)C]CH3OTf through O-[(11)C]methylation and isolated by simplified SPE in 40-60% decay corrected radiochemical yields at EOB, with 185-370 GBq/μmol specific activity at EOS.
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Choudhary S, Muthyala MK, Parang K, Kumar A. Ionic liquid-supported sulfonyl hydrazine: a useful reagent for traceless synthesis of pyrazoles. Org Chem Front 2014; 1:683. [DOI: 10.1039/c4qo00092g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2024]
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Ahamed M, Verbruggen A, Bormans G. Synthetic strategies for radioligands forin vivoimaging of brain cannabinoid type-1 receptors. J Labelled Comp Radiopharm 2013; 56:207-14. [DOI: 10.1002/jlcr.3017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 11/28/2012] [Accepted: 11/30/2012] [Indexed: 02/03/2023]
Affiliation(s)
- Muneer Ahamed
- Laboratory for Radiopharmacy, IMIR KU Leuven, O&N2; Herestraat 49, Box 821; BE-3000; Leuven; Belgium
| | - Alfons Verbruggen
- Laboratory for Radiopharmacy, IMIR KU Leuven, O&N2; Herestraat 49, Box 821; BE-3000; Leuven; Belgium
| | - Guy Bormans
- Laboratory for Radiopharmacy, IMIR KU Leuven, O&N2; Herestraat 49, Box 821; BE-3000; Leuven; Belgium
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Wang M, Gao M, Miller KD, Zheng QH. Synthesis of 2,6-difluoro-N-(3-[11C]methoxy-1H-pyrazolo[3,4-b]pyridine-5-yl)-3-(propylsulfonamidio)benzamide as a new potential PET agent for imaging of B-RafV600E in cancers. Bioorg Med Chem Lett 2013; 23:1017-21. [DOI: 10.1016/j.bmcl.2012.12.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 11/27/2012] [Accepted: 12/10/2012] [Indexed: 10/27/2022]
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Máthé D, Horváth I, Szigeti K, Donohue SR, Pike VW, Jia Z, Ledent C, Palkovits M, Freund TF, Halldin C, Gulyás B. In vivo SPECT and ex vivo autoradiographic brain imaging of the novel selective CB1 receptor antagonist radioligand [125I]SD7015 in CB1 knock-out and wildtype mouse. Brain Res Bull 2013; 91:46-51. [PMID: 23318272 DOI: 10.1016/j.brainresbull.2013.01.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Revised: 01/03/2013] [Accepted: 01/04/2013] [Indexed: 02/01/2023]
Abstract
We aimed to evaluate the novel high-affinity and relatively lipophilic CB(1) receptor (CB(1)R) antagonist radioligand [(125)I]SD7015 for SPECT imaging of CB(1)Rs in vivo using the multiplexed multipinhole dedicated small animal SPECT/CT system, NanoSPECT/CT(PLUS) (Mediso, Budapest, Hungary), in knock-out CB(1) receptor knock-out (CB(1)R-/-) and wildtype mice. In order to exclude possible differences in cerebral blood flow between the two types of animals, HMPAO SPECT scans were performed, whereas in order to confirm the brain uptake differences of the radioligand between knock-out mice and wildtype mice, in vivo scans were complemented with ex vivo autoradiographic measurements using the brains of the same animals. With SPECT/CT imaging, we measured the brain uptake of radioactivity, using %SUV (% standardised uptake values) in CB(1)R-/- mice (n=3) and C57BL6 wildtype mice (n=7) under urethane anaesthesia after injecting [(125)I]SD7015 intravenously or intraperitoneally. The Brookhaven Laboratory mouse MRI atlas was fused to the SPECT/CT images by using a combination of rigid and non-rigid algorithms in the Mediso Fusion™ (Mediso, Budapest, Hungary) and VivoQuant (inviCRO, Boston, MA, USA) softwares. Phosphor imager plate autoradiography (ARG) was performed on 4 μm-thin cryostat sections of the excised brains. %SUV was 8.6±3.6 (average±SD) in CB(1)R-/- mice and 22.1±12.4 in wildtype mice between 2 and 4 h after injection (p<0.05). ARG of identically taken sections from wildtype mouse brain showed moderate radioactivity uptake when compared with the in vivo images, with a clear difference between grey matter and white matter, whereas ARG in CB(1)R(-/-) mice showed practically no radioactivity uptake. [(125)I]SD7015 enters the mouse brain in sufficient amount to enable SPECT imaging. Brain radioactivity distribution largely coincides with that of the known CB(1)R expression pattern in rodent brain. We conclude that [(125)I]SD7015 should be a useful SPECT radioligand for studying brain CB(1)R in mouse and rat disease models.
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Affiliation(s)
- Domokos Máthé
- Department of Biophysics and Radiation Biology, Semmelweis University, H-1094 Budapest, Hungary
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Rao VK, Tiwari R, Chhikara BS, Shirazi AN, Parang K, Kumar A. Copper triflate-mediated synthesis of 1,3,5-triarylpyrazoles in [bmim][PF 6] ionic liquid and evaluation of their anticancer activities. RSC Adv 2013; 3:15396-15403. [PMID: 24163734 DOI: 10.1039/c3ra41830h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A simple, efficient, and environment friendly protocol for the synthesis of 1,3,5-triarylpyrazole and 1,3,5-triarylpyrazolines in [bimm][PF6] ionic liquid mediated by Cu(OTf)2 is described. The reaction protocol gave 1,3,5-triarylpyrazoles in good to high yields (71-84%) via a one-pot addition-cyclocondensation between chalcones and arylhydrazines, and oxidative aromatization without requirement for an additional oxidizing reagent. The catalyst can be reused up to four cycles without much loss in the catalytic activity. The pyrazoles (4a-o) and pyrazolines (3a-n) were evaluated for antiproliferative activity in SK-OV-3, HT-29, and HeLa human cancer cells lines. Among all compounds, 3b inhibited cell proliferation of HeLa cells by 80% at a concentration of 50 μM.
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Affiliation(s)
- V Kameshwara Rao
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333031, Rajasthan, India
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The first synthesis of [11C]J147, a new potential PET agent for imaging of Alzheimer’s disease. Bioorg Med Chem Lett 2013; 23:524-7. [DOI: 10.1016/j.bmcl.2012.11.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2012] [Revised: 10/27/2012] [Accepted: 11/07/2012] [Indexed: 11/23/2022]
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