Resolution and in Vitro and Initial in Vivo Evaluation of Isomers of Iodine-125-Labeled 1-Azabicyclo[2.2.2]oct-3-yl .alpha.-Hydroxy-.alpha.-(1-iodo-1-propen-3-yl)-.alpha.-phenylacetate: A High-Affinity Ligand for the Muscarinic Receptor
作者:Daniel W. McPherson、Carla R. Lambert、Kristi Jahn、Virendar Sood、Robert C. McRee、Barry Zeeberg、Richard C. Reba、Furn F. Knapp
DOI:10.1021/jm00020a004
日期:1995.9
molecular subtype (29.6 +/- 9.70). In vivo biodistribution studies demonstrated that iodine-125-labeled (E)-(-)-(+)-1 cleared rapidly from the brain and heart. In contrast, iodine-125-labeled (E)-(-)-(-)-, (Z)-(-)-(-)-, and (Z)-(-)-(+)-1 have high uptake and retention in mAChR rich areas of the brain. It was also observed that (E)-(-)-(-)-IQNP demonstrated an apparent subtype selectivity in vivo with retention
1-氮杂双环[2.2.2]辛-3-基α-羟基-α-(1-碘-1-丙-3-基)-α-苯乙酸酯(IQNP,1),对毒蕈碱具有高度选择性乙酰胆碱能受体(mAChR)。外消旋混合物中有八种立体异构体。将α-羟基-α-苯基-α-(1-丙炔-3-基)乙酸的旋光异构体拆分为α-甲基苄基胺盐,将3-奎宁环醇的旋光异构体拆分为酒石酸盐。E和Z异构体的制备方法是:改变三键甲锡烷基化的反应条件,然后使用快速柱色谱法纯化。含有(R)-(-)-3-奎宁环酯的四种立体异构体的体外结合测定表明,每个1的异构体均以高亲和力与mAChR结合。此外,(E)-(-)-(-)-IQNP在m1分子亚型(KD,nM,0.383 +/- 0.102)和m2分子亚型(29.6 +/- 9.70)之间显示出最高的受体亚型特异性。体内生物分布研究表明,碘125标记的(E)-(-)-(+)-1从大脑和心脏迅速清除。相反,碘125标记的(E)-