Photolytic decarboxylation of α-arylcarboxylic acids mediated by HgF2 under a dioxygen atmosphere
摘要:
Mercuric fluoride (HgF2), as a light-sensitive inorganic compound, in the presence of dioxygen is able to convert various alpha-aryl- and alpha,alpha-diarylcarboxylic acids into the corresponding aldehydes and ketones selectively under photoirradiation via trapping of the benzylic radical by O-2. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis and ex vivo evaluation of carbon-11 labelled N-(4-methoxybenzyl)-N′-(5-nitro-1,3-thiazol-2-yl)urea ([11C]AR-A014418): A radiolabelled glycogen synthase kinase-3β specific inhibitor for PET studies
摘要:
N-(4-Methoxybenzyl)-N'-(5-nitro-1,3-thiazol-2-y1)urea (AR-A014418), a highly selective inhibitor of glycogen synthase kinase-3 beta (GSK-3 beta), was radiolabelled with carbon-11 (half-life = 20.4 min) for cerebral positron emission tomography (PET) studies. Reaction of desmethyl AR-A014418 with [C-11](CHI)-I-3 produced [C-11]AR-A014418 in 17% decay-corrected radiochemical yield, based on [C-11]CO2, with 3230 mCi/mu mol specific activity after a 30 min synthesis time. The desmethyl precursor of AR-A014418 was synthesized in 23% yield by a novel one-pot reaction of 2-amino-5-nitrothiazole with in situ generated TMS-protected 4-hydroxybenzylisocyanate, following deprotection with acid. Ex vivo biodistribution studies were conducted after [C-11]AR-A014418 was administered via tail vein injection into Sprague-Dawley rats. Very low levels of radioactivity were found in all brain regions (0.08% injected dose/gram of tissue) at 5 and 30 min post-injection, uncorrected for vascular compartment. Considering the extremely poor brain penetration of [11C]AR-A014418 this compound cannot be used to study GSK-3 beta in cerebral PET studies. Furthermore, the specific pharmacological mechanism(s) of antidepressant-like activity attributed to AR-AO14418 should be investigated. (c) 2005 Elsevier Ltd. All rights reserved.