Synthesis and in vitro evaluation of iodine labelled pyrazolo[1,5-<i>a</i>]pyridines as highly selective dopamine D4 receptor ligands
作者:O. Prante、S. Löber、H. Hübner、P. Gmeiner、T. Kuwert
DOI:10.1002/jlcr.508
日期:2001.10.30
Two 131I-labelled radioligands, namely 3-(4-[131I]iodophenylpiperazin-1-ylmethyl)-pyrazolo[1,5-a]pyridine and 3-(4-chlorophenylpiperazin-1-ylmethyl)-7-[131I]iodopyrazolo[1,5-a]pyridine, which are required for studies or binding of these ligands to the D4 receptor, have been synthesized in 80% and 32% radiochemical yields, respectively; the radiochemical purity in each case was >97%. For the second radioligand a kit preparation, based on iododestannylation followed by solid-phase extraction, was possible. In vitro characterization using CHO-cells expressing different dopamine receptor subtypes gave Ki values of 3.1 and 2.6 nM. Both radioligands are highly selective for the D4 subtype as compared to other dopamine subtypes. Copyright © 2001 John Wiley & Sons, Ltd.
已合成两种131I标记的放射性配体:3-(4-[131I]碘苯基哌嗪-1-基甲基)-吡唑并[1,5-a]吡啶和3-(4-氯苯基哌嗪-1-基甲基)-7-[131I]碘吡唑并[1,5-a]吡啶,放射化学产率分别为80%和32%,放射化学纯度均>97%。第二种放射性配体可以通过碘代脱锡反应后固相萃取的试剂盒制备。使用表达不同多巴胺受体亚型的CHO细胞进行体外表征,得到Ki值分别为3.1和2.6 nM。与其他多巴胺亚型相比,这两种放射性配体对D4亚型具有高度选择性。