Synthesis and evaluation of [O-methyl-11C]4-[3-[4-(2-methoxyphenyl)- piperazin-1-yl]propoxy]-4-aza-tricyclo[5.2.1.02,6]dec-8-ene-3,5-dione as a 5-HT1A receptor agonist PET ligand
作者:Vattoly J. Majo、Ramin V. Parsey、Jaya Prabhakaran、J. John Mann、J. S. Dileep Kumar
DOI:10.1002/jlcr.1475
日期:2008.3.15
4-[3-[4-(2-Methoxyphenyl)piperazin-1-yl]propoxy]-4-aza-tricyclo[5.2.1.02,6]dec-8-ene-3,5-dione (4), a potent and selective 5-HT1A agonist, was labeled by 11C-methylation of the corresponding desmethyl analogue 3 with 11C-methyl triflate. The precursor molecule 3 was synthesized from commercially available endo-N-hydroxy-5-norbornene-2,3-dicarboximide in two steps with an overall yield of 40%. Radiosynthesis of 11C-4 was achieved in 35 min in 20±5% yield (n=6) at the end of synthesis with a specific activity of 2600±250 Ci/mmol. In vivo positron emission tomography (PET) studies in baboon revealed rapid uptake of the tracer into the brain. However, lack of specific binding indicates that 11C-4 is not useful as a 5-HT1A agonist PET ligand for clinical studies. Copyright © 2008 John Wiley & Sons, Ltd.
4-[3-[4-(2- 甲氧基苯基)哌嗪-1-基]丙氧基]-4-氮杂三环[5.2.1.02,6]癸-8-烯-3,5-二酮(4)是一种强效和选择性的 5-HT1A 激动剂,通过 11C 甲基化相应的去甲基类似物 3 与 11C 甲基三氟甲基苯甲酸酯进行标记。前体分子 3 是由市售的内-N-羟基-5-降冰片烯-2,3-二甲酰亚胺分两步合成的,总收率为 40%。合成结束时,11C-4 的放射合成在 35 分钟内完成,收率为 20±5%(n=6),比活度为 2600±250 Ci/mmol。在狒狒体内进行的正电子发射断层扫描(PET)研究表明,示踪剂能迅速被大脑吸收。然而,由于缺乏特异性结合,11C-4 无法作为 5-HT1A 激动剂 PET 配体用于临床研究。Copyright © 2008 John Wiley & Sons, Ltd. All Rights Reserved.