Synthesis and biological evaluation of pyridazinone analogues as potential cardiac positron emission tomography tracers
A series of fluorinated pyridazinone derivatives with IC50 values ranging from 8 to 4000 nM for the mitochondrial complex 1 (MC1) have been prepared. Structure-activity relationship (SAR) assessment indicated preference of the fluorine label to be incorporated on an alkyl side chain rather than directly on the pyridazinone moiety. Tissue distribution studies of a series of analogues ([18F] 22-28) in Sprague-Dawley (SD) rats identified [ 18F]27 as the most promising radiotracer with high uptake in cardiac tissue (3.41%ID/g; 30 min post injection) in addition to favorable heart to nontarget organ distribution ratios. MicroPET images of SD rats and nonhuman primates after [18F]27 administration allowed easy assessment of the myocardium through 60 min with minimal lung or liver interference.
Antitumor agent, novel 3(2H)-pyridazinone derivatives and their preparation
Anti-tomor agents comprising novel 3(2H)-pyridazinone derivatives or salts thereof and methods of producing the same are disclosed. Also disclosed is a method for treating or preventing tumors by administering to a mammal a therapeutically effective amount of 4,5-di substituted 3(2H)-pyridazinones and salts thereof.
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(2008/06/13)
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