Palladium-mediated oxidative carbonylation reactions for the synthesis of 11C-radiolabelled ureas

Steven Kealey, Stephen M. Husbands, Idriss Bennacef, Antony D. Gee, Jan Passchier

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20 Citations (SciVal)


Palladium(II)-mediated oxidative carbonylation reactions have been used to synthesize C-radiolabelled ureas via the coupling of amines with [C]carbon monoxide, in a one-pot process. Following trapping of CO in a solution of copper(I) tris(3,5-dimethylpyrazolyl)borate, homocoupling reactions of primary aliphatic amines proceed in the presence of Pd(PPh)Cl to give the corresponding N,N-disubstituted [C]ureas. Secondary amines do not produce the corresponding N,N,N,N-tetrasubsituted [C]ureas under these conditions. This difference in reactivity allows for the formation of unsymmetrical N,N',N'-trisubstituted [C]ureas using a mixture of a primary amine and a reactive secondary amine. The potential use of this method in positron emission tomography (PET) was demonstrated by the synthesis of the M1 muscarinic acetylcholine receptor radiotracer, [C-carbonyl]GSK1034702.
Original languageEnglish
Pages (from-to)202-208
Number of pages7
JournalJournal of Labelled Compounds and Radiopharmaceuticals
Issue number4
Early online date11 Dec 2013
Publication statusPublished - Apr 2014


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