Radiosynthesis of N-[4-(4-fluorobenzyl)piperidin-1-yl]-Nâ²-(2-[11C]oxo-1,3-dihydrobenzimidazol-5-yl)oxamide, a NR2B-selective NMDA receptor antagonist
作者:Romain Labas、Franck Sobrio、Yann Bramoullé、Anne-Sophie Hérard、Martine Guillermier、Philippe Hantraye、Frédéric Dollé、Louisa Barré
DOI:10.1002/jlcr.1702
日期:——
In order to perform in vivo imaging of the NR2B NMDA receptor system by positron emission tomography, a NR2B selective NMDA receptor antagonist has been labelled with carbon-11 (half-life: 20 min). N-[4-(4-fluorobenzyl)piperidin-1-yl]-N′-(2-oxo-1,3-dihydrobenzimidazol-5-yl)oxamide has been described demonstrating high affinity and selectivity for the NR2B receptors (IC50 of 5 nM in [3H]Ro-25,6981 binding assay). The labelling precursor and the reference compound were synthesized by coupling the 4-(4-fluorobenzyl)piperidine with the corresponding oxalamic acid. The reaction of [11C]phosgene with phenylenediamine precursor led the formation of the [11C]benzimidazolone ring present on the ligand. The labelling occurred in THF or acetonitrile and the decay corrected radiochemical yield was 30–40% from the produced [11C]methane. HPLC purification and formulation led to 2.6–3.7 GBq (70–100 mCi) of radioligand within 30–35 min. The specific radioactivity was 72–127 GBq/µmol (2–3.4 Ci/µmol) at the end of synthesis. Copyright © 2009 John Wiley & Sons, Ltd.
为了通过正电子发射断层扫描对 NR2B NMDA 受体系统进行活体成像,一种 NR2B 选择性 NMDA 受体拮抗剂被标记为碳-11(半衰期:20 分钟)。N-[4-(4-氟苄基)哌啶-1-基]-N′-(2-氧代-1,3-二氢苯并咪唑-5-基)草酰胺对 NR2B 受体具有高亲和力和选择性(在[3H]Ro-25,6981 结合试验中 IC50 为 5 nM)。标记前体和参比化合物是通过将 4-(4-氟苄基)哌啶与相应的草氨酸偶联合成的。[11C]光气与苯二胺前体反应,形成配体上的[11C]苯并咪唑酮环。标记是在四氢呋喃或乙腈中进行的,衰变校正放射化学收率为生成的[11C]甲烷的 30-40%。通过 HPLC 纯化和配制,在 30-35 分钟内得到 2.6-3.7 GBq(70-100 mCi)的放射性配体。合成结束时,比放射性为 72-127 GBq/µmol(2-3.4 Ci/µmol)。Copyright © 2009 John Wiley & Sons, Ltd. 版权所有。