3-[[4hyphen;(4-[18F]fluorophenyl)piperazin-1-yl] methyl] -1H-pyrrolo[2,3-b]pyridine, acandidate to image dopamine D4 receptors, was synthesised via electrophilic fluorination of a trimethylstannyl precursor with high specific radioactivity [18F]F2. The precursor was obtained by a facile four-step synthetic approach; the trimethylstannyl leaving group was introduced by displacement of iodine utilising palladium catalysis and hexamethyldistannane in an inert solvent. The total radiosynthesis time was 50 min, including purification and formulation for injection. Decay corrected radiochemical yield was <1% as calculated from the amount of [18F]F− produced. Specific radioactivity at the end of synthesis was 12.8–16.4 GBq/μmol. Radiochemical purity was 88–92%. Ex vivo studies in rats showed homogeneous distribution of radioactivity within rat brain. Copyright © 2002 John Wiley & Sons, Ltd.
3-[[4-
氟(4-[18F]
氟苯基)piperazin-1-基]甲基]-1H-
吡咯并[2,3-b]
吡啶是一种用于成像
多巴胺D4受体的候选化合物,通过对一种高特异性放射性前体进行电亲核
氟化反应合成,该前体的放射性为[18F]F2。该前体通过一种简单的四步合成方法获得;采用
钯催化和六甲基双
锡在惰性溶剂中通过置换
碘引入
三甲基锡离去基团。总放射合成时间为50分钟,包括纯化和注射配制。经过衰变修正后的放射
化学产率低于1%,由产生的[18F]F−的量计算得出。合成结束时的特异性放射性为12.8–16.4 GBq/μmol。放射
化学纯度为88–92%。在大鼠的体外研究表明,放射性在大鼠脑内分布均匀。版权 © 2002 John Wiley & Sons, Ltd.