Design, Synthesis, and Characterization of Benzimidazole Derivatives as Positron Emission Tomography Imaging Ligands for Metabotropic Glutamate Receptor 2
作者:Gengyang Yuan、Xiying Qu、Baohui Zheng、Ramesh Neelamegam、Sepideh Afshar、Suhasini Iyengar、Chuzhi Pan、Junfeng Wang、Hye Jin Kang、Mary Jo Ondrechen、Pekka Poutiainen、Georges El Fakhri、Zhaoda Zhang、Anna-Liisa Brownell
DOI:10.1021/acs.jmedchem.0c01394
日期:2020.10.22
Three benzimidazole derivatives (13–15) have been synthetized as potential positron emission tomography (PET) imaging ligands for mGluR2 in the brain. Of these compounds, 13 exhibits potent binding affinity (IC50 = 7.6 ± 0.9 nM), positive allosteric modulator (PAM) activity (EC50 = 51.2 nM), and excellent selectivity against other mGluR subtypes (>100-fold). [11C]13 was synthesized via O-[11C]methylation
已经合成了三种苯并咪唑衍生物 ( 13 – 15 ) 作为脑中 mGluR2 的潜在正电子发射断层扫描 (PET) 成像配体。在这些化合物中,13 种表现出强大的结合亲和力 (IC 50 = 7.6 ± 0.9 nM)、正变构调节剂 (PAM) 活性 (EC 50 = 51.2 nM) 以及对其他 mGluR 亚型的出色选择性(> 100 倍)。[ 11 C] 13是通过其苯酚前体25与[ 11 C]甲基碘的O- [ 11 C]甲基化合成的。达到的放射化学产率为 20 ± 2% ( n= 10,衰减校正)基于 [ 11 C]CO 2,放射化学纯度 > 98%,摩尔活性为 98 ± 30 GBq/μmol EOS 。离体生物分布研究揭示了 [ 11 C] 13和肝胆和尿排泄的可逆积累。大鼠的 PET 成像研究表明 [ 11 C] 13在富含 mGluR2 的大脑区域中积累。mGluR2 选择性