A fast, simple, and reproducible automated synthesis of [18F]FPyKYNE-c(RGDyK) for αvβ3 receptor positron emission tomography imaging
作者:Ana C. Valdivia、Miriam Estrada、Tayebeh Hadizad、Duncan J. Stewart、Rob S. Beanlands、Jean N. DaSilva
DOI:10.1002/jlcr.1948
日期:2012.2
[18 F]FPyKYNE-c(RGDyK) was successfully synthesized by the Cu(I) catalyzed Huisgen 1,3-dipolar cycloaddition of alkynes to azides using [18 F]FPyKYNE as a prosthetic group in an overall radiochemical yield of 12%–18% (decay-corrected) and >99.5% chemical and radiochemical purities in 125 min including quality control. This simple, fully automated two-step, two-reactor approach consists of a quick and convenient purification of the prosthetic group using silica gel cartridges and its subsequent use for the labeling of the azido-c(RGDyK) peptide via click chemistry.
Aryl Radical Enabled, Copper-Catalyzed Sonogashira-Type Cross-Coupling of Alkynes with Alkyl Iodides
作者:Xiaojun Zeng、Chao Wang、Wenhao Yan、Jian Rong、Yanshan Song、Zhiwei Xiao、Aijie Cai、Steven H. Liang、Wei Liu
DOI:10.1021/acscatal.2c05901
日期:2023.2.17
Despite the success of Sonogashira coupling for the synthesis of arylalkynes and conjugated enynes, the engagement of unactivated alkyl halides in such reactions remains historically challenging. We report herein a strategy that merges Cu-catalyzed alkyne transfer with the aryl radical activation of carbon–halide bonds to enable a general approach for the coupling of alkyl iodides with terminal alkynes
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<sup>18</sup>
F]Fluoropyridine‐losartan: A new approach toward human Positron Emission Tomography imaging of Angiotensin II Type 1 receptors
作者:Aida Mary Abreu Diaz、Zalua Rodriguez Riera、Yanick Lee、Luis Miguel Esteves、Charles‐Olivier Normandeau、Baptiste Fezas、Alejandro Hernandez Saiz、François Tournoux、Daniel Juneau、Jean N. DaSilva
DOI:10.1002/jlcr.4014
日期:2023.3
[18F]fluoropyridine-losartan in very high molar activity. Automated radiosynthesis was performed in a three-step, two-pot, and two-HPLC-purification procedure within 2 h. Pure [18F]FPyKYNE was obtained by radiofluorination of NO2PyKYNE and silica-gel-HPLC purification (40 ± 9%), preventing the formation of nitropyridine-losartan in the second step. Conjugation with trityl-losartan azide via click chemistry, followed
血管紧张素 II 1 型受体 (AT 1 R) 阻断剂氯沙坦用于患有肾脏和心血管疾病的患者。[ 18 F]氟吡啶-氯沙坦已显示出对 AT 1 R 的定量肾脏 PET 成像有利的结合特征,在大鼠和猪中具有选择性结合、放射性代谢物的低干扰和用于临床转化的适当剂量测定。开发了一种新方法来生产具有非常高摩尔活性的[ 18 F] 氟吡啶-氯沙坦。自动放射合成在 2 小时内以三步、两锅和两次 HPLC 纯化程序进行。纯 [ 18 F]FPyKYNE 是通过 NO 2的放射氟化获得的PyKYNE 和硅胶-HPLC 纯化 (40 ± 9%),防止第二步中硝基吡啶-氯沙坦的形成。通过点击化学与三苯甲基-氯沙坦叠氮化物缀合,随后进行酸水解、C18-HPLC 纯化和重新配制,提供 11 ± 2% 的 [ 18 F ] 氟吡啶-氯沙坦(根据 [ 18 F] 氟化物进行衰减校正,EOB)。使用三 [(1-(3-羟丙基)-1
Synthesis and evaluation of the novel 2-[18F]fluoro-3-propoxy-triazole-pyridine-substituted losartan for imaging AT1 receptors
作者:Natasha Arksey、Tayebeh Hadizad、Basma Ismail、Maryam Hachem、Ana C. Valdivia、Rob S. Beanlands、Robert A. deKemp、Jean N. DaSilva
DOI:10.1016/j.bmc.2014.06.011
日期:2014.8
The 2-[F-18]fluoro-3-pent-4-yn-1-yloxypyridine ([F-18]FPyKYNE) analog of the potent non-peptide angiotensin II type 1 receptor (AT(1)R) blocker losartan was produced via click chemistry linking [F-18]FPyKYNE to azide-modified tetrazole-protected losartan followed by TFA deprotection. Preliminary small animal imaging with positron emission tomography (PET) in rats displayed high uptake in the kidneys with good contrast to surrounding tissue. Rat metabolism displayed the presence of 23% unchanged tracer in plasma at 30 min. Upon co-administration with AT(1)R blocker candesartan (2.5, 5 and 10 mg/kg), a dose-dependent reduction (47-65%) in tracer uptake was observed in the kidney, while no difference was observed following AT(2)R blocker PD123,319 (5 mg/kg), indicating binding selectivity for AT(1)R over AT(2)R and potential for imaging AT(1)R using PET. (C) 2014 Elsevier Ltd. All rights reserved.