Radiosynthesis of (±)-(2-((4-(2-[<sup>18</sup>F]fluoro-ethoxy)phenyl)bis(4-methoxy-phenyl)methoxy)ethylpiperidine-3-carboxylic acid: a potential GAT-3 PET ligand to study GABAergic neuro-transmission<i>in vivo</i>
作者:Ralf Schirrmacher、Wilhelm Hamkens、Markus Piel、Ulrich Schmitt、Hartmut Lüddens、Christoph Hiemke、Frank Rösch
DOI:10.1002/jlcr.492
日期:2001.8
A dysfunction of GABAergic neurotransmission is related to diseases such as epilepsy, Huntington-disease and Parkinson-syndrome. A new 18F-fluorine labelled GABA transporter ligand for the GABA-transporter subtype GAT-3 was developed which may allow the in vivo visualisation of GABAergic neurotransmission. The precursors ethyl (2-(4-hydroxyphenyl)bis(4-methoxyphenyl)-methoxy)ethyl)-piperidine-3-carboxylate and ethyl(2-((4-(2-tosylethoxy)phenyl)-bis(4-methoxyphenyl)-methoxy) ethyl)-piperidine3-carboxylate were synthesised and labelled by the use of 2-[18F]fluoroethyltosylate or [18F]fluoride. Subsequent cleavage of the ester moiety gave the final product (±)-(2-((4-(2-[18F]fluoroethoxy)phenyl)bis(4-methoxy-phenyl)methoxy)ethyl)piperidine-3-carboxylic acid in a decay corrected yield of 33–36%. Preliminary biodistribution kinetics were determined with BALB/c mice ex vivo for brain, liver, kidney, spleen, blood and bone. (2-((4-(2-[18F]fluoroethoxy)-phenyl)bis(4-methoxyphenyl)methoxy)-ethyl) piperidine-3-carboxylic acid showed a maximum brain uptake after 1 h p.i. of about 0.3% ID/g. Copyright © 2001 John Wiley & Sons, Ltd.
GABA能神经传递的功能障碍与癫痫、亨廷顿舞蹈病和帕金森综合征等疾病有关。开发了一种新的18F氟标记的GABA转运蛋白配体,用于GABA转运蛋白亚型GAT-3,这可能允许在体内可视化GABA能神经传递。合成了前体化合物ethyl (2-(4-hydroxyphenyl)bis(4-methoxyphenyl)-methoxy)ethyl)-piperidine-3-carboxylate和ethyl(2-((4-(2-tosylethoxy)phenyl)-bis(4-methoxyphenyl)-methoxy) ethyl)-piperidine3-carboxylate,并通过使用2-[18F]fluoroethyltosylate或[18F]氟化物进行了标记。随后,酯基的裂解得到了最终产物(±)-(2-((4-(2-[18F]fluoroethoxy)phenyl)bis(4-methoxy-phenyl)methoxy)ethyl)piperidine-3-carboxylic acid,衰减修正后的产率为33–36%。对BALB/c小鼠进行的初步生物分布动力学研究显示,该化合物在注射后1小时脑内摄取达到最大值,大约为0.3% ID/g。版权© 2001 John Wiley & Sons, Ltd.