Synthesis and Evaluation of Novel Carbon-11 Labeled Oxopurine Analogues for Positron Emission Tomography Imaging of Translocator Protein (18 kDa) in Peripheral Organs
作者:Katsushi Kumata、Joji Yui、Akiko Hatori、Masayuki Fujinaga、Kazuhiko Yanamoto、Tomoteru Yamasaki、Kazunori Kawamura、Hidekatsu Wakizaka、Nobuki Nengaki、Yuichiro Yoshida、Masanao Ogawa、Toshimitsu Fukumura、Ming-Rong Zhang
DOI:10.1021/jm200516a
日期:2011.9.8
To develop a PET ligand for imaging TSPO in peripheral organs, we designed three novel oxopurine analogues [11C]3a–c (LogD: 1.81–2.17) by introducing a pyridine ring in place of a benzene ring in the lead compound [11C]2 (LogD: 3.48). The desmethyl precursors 10 for radiosynthesis were synthesized by reacting glycine 7 with picolylamines 4, followed by hydrolysis and by Curtius rearrangement with diphenylphosphoryl
为了开发用于在外周器官中对TSPO进行成像的PET配体,我们通过在前导化合物[ 11 C ]中引入吡啶环代替苯环,设计了三种新颖的氧嘌呤类似物[ 11 C] 3a – c(LogD:1.81–2.17)。] 2(LogD:3.48)。通过使甘氨酸7与甲基吡啶胺4反应,然后水解并与二苯基磷酰基叠氮化物进行Curtius重排,来合成用于放射合成的去甲基前体10。的甲基化10A - Ç用甲基碘产生的未标记的化合物3A - Ç。[的放射性合成11a ] 3a – c通过使10a – c与[ 11 C]甲基碘反应来进行。化合物3a – c对TSPO表现出较高或中等的体外结合亲和力(K i:5–40 nM)。大鼠中[ 11 C] 3a - c的PET表现出较高的肺,心脏和肾脏摄取,这些器官是高TSPO表达的器官。[ 11 C] 3a的代谢物分析表明,这些器官中的放射性主要与未改变的[ 11 C] 3a相对应。PET