(4-[18F]Fluoro-3-iodobenzyl)guanidine, a Potential MIBG Analog for Positron Emission Tomography
摘要:
The aims of this investigation were to develop a no-carrier-added (nea) synthesis of (4-[F-18]-fluoro-3-iodobenzyl)guanidine (F-18]FIBG) and to evaluate its potential as an MIBG analogue useful for positron emission tomography. [F-18]FIBG was prepared in four steps starting from 4-cyano-2-iodo-N,N,N-trimethylanilinium trifluoromethanesulfonate in 5% decay-corrected radiochemical yield in a total synthesis time of 130 min. The specific activity was more than 1500 Ci per mmol. In vitro binding studies showed that the percent binding of [F-18]FIBG to SK-N-SH human neuroblastoma cells remained constant over a 3-log activity range and was similar to that of nca [I-131]MIBG. Specific and high uptake of FIBG was also seen in mouse heart and adrenals. The in vitro and in vivo properties of[F-18]FIBG suggest that this compound may be a useful positron-emitting analogue of MIBG.
Utilising Sodium-Mediated Ferration for Regioselective Functionalisation of Fluoroarenes via C−H and C−F Bond Activations
作者:Lewis C. H. Maddock、Tracy Nixon、Alan R. Kennedy、Michael R. Probert、William Clegg、Eva Hevia
DOI:10.1002/anie.201709750
日期:2018.1.2
Pairing iron bis(amide) Fe(HMDS)2 with Na(HMDS) to form new sodium ferrate base [(dioxane)0.5⋅NaFe(HMDS)3] (1) enables regioselective mono and di‐ferration (via direct Fe−H exchange) of a wide range of fluoroaromatic substrates under mild reaction conditions. Trapping of several ferrated intermediates has provided key insight into how synchronised Na/Fe cooperation operates in these transformations
配对铁双(酰胺)的Fe(HMDS)2用Na(HMDS),以形成新的高铁酸钠基[(二恶烷)0.5 ⋅NaFe(HMDS)3 ](1)使区域选择性单和二ferration(经由直接的Fe-H在温和的反应条件下交换各种氟代芳族底物。捕获数种高精化中间体的方法提供了关键的见解,以了解同步的Na / Fe合作如何在这些转化过程中发挥作用。此外,在80°C下使用过量的1会在一个引人注目的级联过程中引发集体的双重C / H /三重C-F键活化,其中每个C-H键均转换为C-Fe键,而每个C-F键被转化为CN键
Halogenation reactions
申请人:BNFL Fluorochemicals Ltd
公开号:US05734073A1
公开(公告)日:1998-03-31
A method of halogenating an aromatic compound which comprises the steps of reacting an halogenating agent with the aromatic compound in the presence of fluorine and an acid, wherein the halogenating agent is at least one of an iodinating agent, a brominating agent and an chlorinating agent.
Elemental fluorine. Part 4. Use of elemental fluorine for the halogenation of aromatics
作者:Richard D. Chambers、Christopher J. Skinner、Malcolm J. Atherton、John S. Moilliet
DOI:10.1039/p19960001659
日期:——
inert medium, such as 1,1,2-trichlorotrifluoroethane (CF2CICFCl2) or perfluorocarbon, and elementalfluorine is passed through the system at room temperature. High conversions to iodoaromatic products occur, even with some deactivated systems, e.g. nitrobenzene. A very powerful brominating system is produced using the analagous methodology.
Kappa opioid receptor (KOR) antagonists are potential drug candidates for diseases such as treatment-refractory depression, anxiety, and addictive disorders. PETimaging radiotracers for KOR can be used in occupancy study to facilitate drug development, and to investigate the roles of KOR in health and diseases. We have previously developed two 11C-labeled antagonist radiotracers with high affinity
The arylation of heteroatom nucleophiles is a central strategy to reach diarylated compounds that are key building blocks in agrochemicals, materials, and pharmaceuticals. Nucleophilicaromaticsubstitution is a classical tool for such arylations, and recent developments in hypervalent iodine-mediated arylations allow a wider scope of products. Herein, we combine the benefits of these strategies to