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。