Radiosynthesis and bioconjugation of [<sup>18</sup>F]FPy5yne, a prosthetic group for the<sup>18</sup>F labeling of bioactive peptides
作者:James A. H. Inkster、Brigitte Guérin、Thomas J. Ruth、Michael J. Adam
DOI:10.1002/jlcr.1561
日期:2008.11
A new 18F-based prosthetic group has been prepared for the labeling of azide-modified peptides for use in PET imaging. 2-[18F]fluoro-3-(hex-5-ynyloxy)pyridine ([18F]FPy5yne, [18F]-1) was prepared via efficient nucleophilic heteroaromatic substitution of either the corresponding 2-nitro (2) or 2-trimethylammonium trifluoromethanesulfonate pyridine (3). Best radiochemical yield of [18F]FPy5yne from 2 was 91% by radioTLC (15 min, 110°C, DMSO). From 3, best radiochemical yield by radioTLC was 93% (15 min, 110°C, MeCN). HPLC-purified [18F]FPy5yne was ligated to model peptide N3–(CH2)4–CO–YKRI–OH by way of CuI-mediated Huisgen [3+2] cycloaddition in the presence of copper-stabilizing ligand tris(benzyltriazolylmethyl)amine (TBTA) and N,N-diisopropylethylamine (DIEA). Bioconjugate radiochemical yields were obtained in average yields of 89%±8.6% (n=4), as judged by radioHPLC. Best non-decay-corrected, collected radiochemical yield of modified peptide from end-of-bombardment was 5.8% (18.7% decay-corrected), with a total preparation time of 160 min from start of synthesis. Copyright © 2008 John Wiley & Sons, Ltd.
一种基于18F的新型支架已被制备用于标记叠氮化修饰的多肽,以便在PET成像中使用。2-[18F]氟-3-(己-5-炔氧基)吡啶([18F]FPy5yne,[18F]-1)是通过有效的亲核杂环芳香族取代反应制备的,使用相应的2-硝基(2)或2-三甲基铵三氟甲磺酸盐吡啶(3)。从2中获得的[18F]FPy5yne的最佳放射化学产率为91%(射线TLC,15分钟,110°C,DMSO)。从3中获得的最佳放射化学产率为93%(射线TLC,15分钟,110°C,MeCN)。通过HPLC纯化的[18F]FPy5yne通过CuI介导的Huisgen [3+2]环加成反应与模型多肽N3–(CH2)4–CO–YKRI–OH连接,在铜稳定配体三(苄基三唑基甲基)胺(TBTA)和N,N-二异丙基乙胺(DIEA)的存在下。生物共轭物的放射化学产率平均为89%±8.6%(n=4),通过放射HPLC判断。从轰击结束时获得的未衰减校正的最佳收集放射化学产率为5.8%(衰减校正后为18.7%),总制备时间为160分钟。版权所有 © 2008 John Wiley & Sons, Ltd.