Radiosynthesis of 4-[<sup>18</sup>F]fluoromethyl-L-phenylalanine and [<sup>18</sup>F]FET via a same strategy and automated synthesis module
作者:Ken Kersemans、John Mertens、Vicky Caveliers
DOI:10.1002/jlcr.1701
日期:——
Currently there is still a need for more potent amino acid analogues as tumour imaging agents for peripheral tumour imaging with PET as it was recently reported that the success of O-(2′-[18F]fluoroethyl)-L-tyrosine ([18F]FET) is limited to brain, head and neck tumours. As the earlier described 2-Amino-3-(2-[18F]fluoromethyl-phenyl)-propionic acid (2-[18F]FMP) suffered from intramolecular-catalysed defluorination, we synthesized 2-Amino-3-(4-[18F]fluoromethyl-phenyl)-propionic acid (4-[18F]FMP) as an alternative for tumour imaging with PET. Radiosynthesis of 4-[18F]FMP, based on Br for [18F] aliphatic nucleophilic exchange, was performed with a customized modular Scintomics automatic synthesis hotboxthree system in a high overall yield of 30% and with a radiochemical purity of \gt 99%. 4-[18F]FMP was found to be stable in its radiopharmaceutical formulation, even at high radioactivity concentrations. Additionally, for a comparative study, [18F]FET was synthesized using the same setup in 40% overall yield, with a radiochemical purity \gt 99%. The described automated radiosynthesis allows the production of two different amino acid analogues with minor alternations to the parameter settings of the automated system, rendering this unit versatile for both research and clinical practice. Copyright © 2009 John Wiley & Sons, Ltd.
最近有报道称,O-(2′-[18F]氟乙基)-L-酪氨酸([18F]FET)的成功应用仅限于脑、头颈部肿瘤,因此目前仍需要更多的强效氨基酸类似物作为肿瘤成像剂,用于 PET 外周肿瘤成像。由于早先描述的 2-氨基-3-(2-[18F]氟甲基-苯基)-丙酸(2-[18F]FMP)存在分子内催化脱氟现象,我们合成了 2-氨基-3-(4-[18F]氟甲基-苯基)-丙酸(4-[18F]FMP)作为 PET 肿瘤成像的替代品。4-[18F]FMP的放射合成基于[18F]脂肪族亲核交换的Br,使用定制的模块化Scintomics自动合成热盒三系统进行,总产率高达30%,放射化学纯度为99%。研究发现,即使在高放射性浓度下,4-[18F]FMP 在其放射性药物制剂中也是稳定的。此外,为了进行比较研究,使用相同的装置合成了[18F]FET,总产率为 40%,放射化学纯度为 99%。所描述的自动化放射合成只需对自动化系统的参数设置稍作改动,就能生产出两种不同的氨基酸类似物,从而使该装置成为研究和临床实践的多功能设备。Copyright © 2009 John Wiley & Sons, Ltd. All Rights Reserved.