Synthesis and in vivo evaluation of [11C]SN003 as a PET ligand for CRF1 receptors
作者:J.S. Dileep Kumar、Vattoly J. Majo、Gregory M. Sullivan、Jaya Prabhakaran、Norman R. Simpson、Ronald L. Van Heertum、J. John Mann、Ramin V. Parsey
DOI:10.1016/j.bmc.2006.02.019
日期:2006.6
Synthesis and evaluation of [O-methyl-C-11](4-methoxy-2-methylphenyl)[1-(1-methoxymethylpropyl)-6-methyl-1H-[1,2,3]triazolo[4,5-c]pyridin-4-yl]amine or [C-11]SN003 ([C-11]6), as a PET imaging agent for CRF1 receptors, in baboons is described. 4-[1-(1-Methoxymethylpropyl)-6-methyl-H-1-[1,2,3]triazolo[4,5-elpyridin-4-ylamino]-3-methylphenol (5), the precursor molecule for the radiolabeling, was synthesized from 2,4-dichloro-6-methyl-3-nitropyridine in seven steps with 20% overall yield. The total time required for the synthesis of [C-11]SN003 is 30 min from EOB using [C-11]methyl triflate in the presence of NaOH in acetone. The yield of the synthesis is 22% (EOS) with > 99% chemical and radiochemical purities and a specific activity of > 2000 Ci/mmol. PET studies in baboon show that [C-11]6 penetrates the BBB and accumulates in brain. No detectable specific binding was observed, likely due to the rapid metabolism or low density of CRF1 receptors in primate brain. (c) 2006 Elsevier Ltd. All rights reserved.