Synthesis and in vivo evaluation of a novel peripheral benzodiazepine receptor PET radioligand
作者:Michelle L. James、Roger R. Fulton、David J. Henderson、Stefan Eberl、Steven R. Meikle、Sally Thomson、Robin D. Allan、Frederic Dolle、Michael J. Fulham、Michael Kassiou
DOI:10.1016/j.bmc.2005.06.030
日期:2005.11
an affinity of K(i)=4.7 nM. In this study, 1 was successfully synthesised and demethylated to form the phenolic derivative 6 as precursor for labelling with carbon-11 (t(1/2) = 20.4 min). [11C]1 was prepared by O-alkylation of 6 with [11C]methyl iodide. The radiochemical yield of [(11)C]1 was 9% (non-decay corrected) with a specific activity of 36 GBq/micromol at the end of synthesis. The average time
新型吡唑并嘧啶配体N,N-二乙基-2- [2-(4-甲氧基苯基)-5,7-二甲基-吡唑并[1,5-a]嘧啶-3-基]-乙酰胺1(DPA-713 ),据报道是外围苯并二氮杂receptor受体(PBR)的有效配体,显示K(i)= 4.7 nM的亲和力。在这项研究中,成功地合成了1并脱甲基,以形成酚衍生物6作为碳11标记的前体(t(1/2)= 20.4分钟)。通过用[11C]甲基碘将6进行O-烷基化来制备[11C] 1。合成结束时,[(11)C] 1的放射化学产率为9%(未进行衰变校正),比活性为36 GBq / micromol。包括制剂在内的平均合成时间为13.2分钟,放射化学纯度> 98%。使用正电子发射断层扫描(PET)在健康的狒狒狒狒狒狒中进行[11C] 1的体内评估。静脉内注射[11C] 1后,在狒狒的大脑和周围器官中观察到大量积累。在大脑中,放射性在20分钟达到峰值,并在成像