Synthesis, Fluorine-18 Radiolabeling, and Biological Evaluation of <i>N</i>-((<i>E</i>)-4-Fluorobut-2-en-1-yl)-2β-carbomethoxy-3β-(4′-halophenyl)nortropanes: Candidate Radioligands for In Vivo Imaging of the Brain Dopamine Transporter with Positron Emission Tomography
作者:Jeffrey S. Stehouwer、Lauryn M. Daniel、Ping Chen、Ronald J. Voll、Larry Williams、Susan J. Plott、John R. Votaw、Michael J. Owens、Leonard Howell、Mark M. Goodman
DOI:10.1021/jm100269c
日期:2010.8.12
The N-(E)-fluorobutenyl-3 beta-(para-halo-phenyl)nortropanes 9-12 were synthesized as ligands of the dopamine transporter (DAT) for use as F-18-labeled positron emission tomography (PET) imaging agents. In vitro competition binding assays demonstrated that compounds 9-12 have a high affinity for the DAT and are selective for the DAT compared to the serotonin and norepinephrine transporters. MicroPET imaging with [F-18]9 [F-18]11 in anesthetized cynomolgus monkeys showed high uptake in the putamen with lesser uptake in the caudate, but significant washout of the radiotracer was only observed for [F-18]9. PET imaging with [E-18]9 in an awake rhesus monkey showed high and nearly equal uptake in both the putamen and caudate with peak uptake achieved after 20 min followed by a leveling-off for about 10 min and then a steady washout and attainment of a quasi-equilibrium. During the time period 40-80 min postinjection of [F-18]9, the ratio of uptake in the putamen and caudate vs cerebellum uptake was a >= 4.
Synthesis and monoamine uptake inhibition of conformationally constrained 2β-carbomethoxy-3β-phenyl tropanes
作者:Patrick Johannes Riss、René Hummerich、Patrick Schloss
DOI:10.1039/b902863c
日期:——
A series of 2β-carbomethoxy-3β-phenyl tropanes with conformationally constrained nitrogen substituents were synthesized as potential selective dopamine transporter ligands. These novel compounds were examined for their monoamine uptake inhibition potency at the human dopamine transporter (hDAT), the human serotonin transporter (hSERT) and the human noradrenalin transporter (hNET), stably expressed
Synthesis, radiosynthesis and in vivo preliminary evaluation of [11C]LBT-999, a selective radioligand for the visualisation of the dopamine transporter with PET
LBT-999 (8-((E)-4-fluoro-but-2-enyl)-3beta-p-tolyl-8-aza-bicyclo[3.2.1]octane-2beta-carbo xylic acid methyl ester), a cocaine derivative belonging to a new generation of highly selectivedopaminetransporter (DAT) ligands, and its corresponding carboxylic acid derivative, the latter used as precursor for labelling both with tritium and the positron-emitter carbon-11 (half-life: 20.38 min), were synthesized