5-(5-(6-[11C]methyl-3,6-diazabicyclo[3.2.0]heptan-3-yl)pyridin-2-yl)-1H-indole as a potential PET radioligand for imaging cerebral α7-nAChR in mice
作者:Yongjun Gao、Hayden T. Ravert、Heather Valentine、Ursula Scheffel、Paige Finley、Dean F. Wong、Robert F. Dannals、Andrew G. Horti
DOI:10.1016/j.bmc.2012.04.056
日期:2012.6
The radiosynthesis and in vivo evaluation of 5-(5-(6-[C-11]methyl-3,6-diazabicyclo[3.2.0]heptan-3-yl)pyridin-2-yl)-1H-indole [C-11]rac-(1), a potential PET tracer for alpha 7 nicotinic acetylcholine receptors (alpha 7-nAChR), are described. Syntheses of the nonradioactive standard rac-1 and corresponding desmethyl precursor 7 were achieved in several reaction steps. Radiomethylation of 7 with [C-11]CH3I afforded [C-11] rac-1 in an average radiochemical yield of 30 +/- 5% (n = 5) with high radiochemical purity and an average specific radioactivity of 444 +/- 74 GBq/mu mol (n = 5). The total synthesis time was 30 min from end-of-bombardment. Biodistribution studies in mice showed that [C-11] rac-1 penetrates the blood-brain barrier and specifically labels neuronal alpha 7-nAChRs. (C) 2012 Elsevier Ltd. All rights reserved.