Synthesis of [18F]fluoroacetaldehyde. Application to [18F]fluoroethylation of benzylamine under reductive alkylation conditions
作者:C. Prenant、J. Gillies、J. Bailey、G. Chimon、N. Smith、G. C. Jayson、J. Zweit
DOI:10.1002/jlcr.1514
日期:2008.5
The radiosynthesis of a new [18F]fluoroalkylating agent, [18F]fluoroacetaldehyde, is described. It was produced using the Kornblum method by oxidation with dimethyl sulphoxide of 2-[18F]fluoroethyl p-toluenesulphonate ([18F]FETos). In these conditions the oxidation proceeds smoothly and rapidly to the selective conversion of tosyl esters of primary alcohols to aldehydes with no carboxylic acids being produced. The chemical identity of [18F]fluoroacetaldehyde was determined by comparing its chromatographic properties as well as those of its 2,4-dinitrophenylhydrazone (2,4-DNPH) derivative with those of, respectively, the standard fluoroacetaldehyde and its 2,4-DNPH derivative. Standard fluoroacetaldehyde was prepared by oxidation of fluoroethanol with pyridinium dichromate and characterized as its 2,4-DNPH derivative by mass spectrometry. To test its reactivity with amines under reductive alkylation conditions, [18F]fluoroacetaldehyde was reacted with benzylamine used as model substrate. The chemical identity of the resulting radiolabelled product was determined to be [18F]N-(2-fluoroethyl)-benzylamine by comparing its chromatographic properties with those of the synthesized standard N-(2-fluoroethyl)-benzylamine characterized by 19F and 1H NMR spectroscopy and mass spectrometry. This new fluorine-18 labelled synthon may find applications in radiolabelling peptide, protein and antibody fragments as well as in aldol condensation or in the Mannich reaction. Copyright © 2008 John Wiley & Sons, Ltd.
本文介绍了一种新型[18F]氟烷基化剂--[18F]氟乙醛的放射合成。它是通过 2-[18F]fluoroethyl p-toluenesulphonate ([18F]FETos)与二甲基亚砜的氧化作用,采用 Kornblum 方法制得的。在这些条件下,氧化作用顺利而迅速地进行,将伯醇的甲苯基酯选择性地转化为醛,而不产生羧酸。通过比较[18F]氟乙醛及其 2,4-二硝基苯腙(2,4-DNPH)衍生物的色谱特性和标准氟乙醛及其 2,4-DNPH 衍生物的色谱特性,确定了[18F]氟乙醛的化学特性。标准氟乙醛是用重铬酸吡啶鎓氧化氟乙醇制备的,其 2,4-DNPH 衍生物用质谱法表征。为了测试其在还原烷基化条件下与胺的反应性,[18F]氟乙醛与作为模型底物的苄胺发生了反应。通过比较[18F]N-(2-氟乙基)-苄胺与合成的标准 N-(2-氟乙基)-苄胺的色谱特性以及 19F 和 1H NMR 光谱和质谱特性,确定了所得到的放射性标记产物的化学特性为[18F]N-(2-氟乙基)-苄胺。这种新的氟-18 标记合成物可用于肽、蛋白质和抗体片段的放射性标记以及醛醇缩合或曼尼希反应。Copyright © 2008 John Wiley & Sons, Ltd. 版权所有。