Towards the preparation of radiolabeled 1-aryl-3-benzyl ureas: Radiosynthesis of [(11)C-carbonyl] AR-A014418 by [(11)C]CO(2) fixation.

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Hicks JW, Wilson AA, Rubie EA, Woodgett JR, Houle S, Vasdev N

Towards the preparation of radiolabeled 1-aryl-3-benzyl ureas: Radiosynthesis of [(11)C-carbonyl] AR-A014418 by [(11)C]CO(2) fixation.

Bioorg Med Chem Lett. 2012 Mar 1;22(5):2099-101. doi: 10.1016/j.bmcl.2011.12.139. Epub 2012 Jan 10.

PubMed ID

22321216 [ View in PubMed

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Abstract

The highly selective glycogen synthase kinase-3 (GSK-3) inhibitor N-(4-methoxybenzyl)-N'-(5-nitro-1,3-thiazol-2-yl)urea (AR-A014418) was radiolabeled with carbon-11 ((11)C; half-life=20.4min) at the urea moiety via [(11)C]CO(2) fixation. Reaction of [(11)C]CO(2) with 4-methoxybenzylamine in the presence of a CO(2) fixating base was followed by dehydration with POCl(3) and addition of 2-amino-5-nitrothiazole to prepare [(11)C-carbonyl] AR-A014418. This reaction resulted in an 8% uncorrected radiochemical yield, based on [(11)C]CO(2), with high specific activity (4Ci/mumol) within 30min. An in vitro GSK-3beta enzyme activity assay revealed that AR-A014418 (K(i)=770nM) is not as potent as previously claimed. The [(11)C]CO(2) fixation methodology described herein should prove generally applicable to preparing 1-aryl-3-benzyl-[(11)C-carbonyl] ureas as radiotracers for positron emission tomography.

DrugBank Data that Cites this Article

Binding Properties

Drug	Target	Property	Measurement	pH	Temperature (°C)
AR-AO-14418	Glycogen synthase kinase-3 beta	Ki (nM)	38	N/A	N/A	Details
AR-AO-14418	Glycogen synthase kinase-3 beta	Ki (nM)	770	N/A	N/A	Details