Synthesis and evaluation of 18F-labeled dopamine D3 receptor ligands as potential PET imaging agents
作者:Carsten Hocke、Olaf Prante、Stefan Löber、Harald Hübner、Peter Gmeiner、Torsten Kuwert
DOI:10.1016/j.bmcl.2005.07.037
日期:2005.11
A series of fluoro substituted aryl carboxamides was synthesized revealing high affinity for the dopamine D3 receptor. In contrast to 2-methoxy substitution, a 2,3-dichloro substitution pattern at the phenylpiperazine moiety induces a 10-fold increase of D3 affinity which is expressed by K-i values of 0.53, 1.1, and 9.0 nM for 8b, 8d, and 8f. Applying aromatic F-18-for-Br(Cl) substitution, high radiochemical yields between 76-82% were obtained for [F-18]8c-f. The most promising ligand, [F-18]8d, was used as imaging agent of the D3 receptor in vitro. However, due to the lack of specific binding, further studies should aim at the development of radioligands with improved D3 receptor selectivity. (c) 2005 Elsevier Ltd. All rights reserved.