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F-18-labelled vorozole analogues as PET tracer for aromatase.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
2008 (English)In: Journal of labelled compounds & radiopharmaceuticals, ISSN 0362-4803, Vol. 51, no 5, 207-212 p.Article in journal (Refereed) Published
Abstract [en]

One- and two-step syntheses for the F-18-labelling of 6-[(S)-(4-chlorophenyl)(1H-1,2,4-triazol-1-yl)methyl]-1-(2-[F-18]fluoroe thyl)-1H-benzotriazole, [F-18]FVOZ, 1 and 6-[(S)-(4-chlorophenyl)(1H-1,2,4-triazol-1-yl)methyl]-1-[2-(2-[18F]fluor oethoxy)ethyl]-1H-benzotriazole, [F-18]FVOO, 2 were developed. In the two-step synthesis, the nucleophilic fluorination step was performed by reacting (S)-6-[(4-chlorophenyl)-(1H-1,2,4-triazol-1-yl)methyl]-1H-benzotriazole (VOZ) with either the F-18-labelled ethane-1,2-diyl bis(4-methylbenzenesulfonate) or the oxydiethane-2,1-diyl bis(4-methylbenzenesulfonate). The radiochemical yields were in the range of 9-13% after the 110-120 min total syntheses and the specific radioactivities were 175 +/- 7 GBq/mu mol and 56 GBq/mu mol for compounds 1 and 2, respectively. In the one-step synthesis, the precursor 2-{6-[(4-chlorophenyl)(1H-1,2,4-triazol-1-yl)methyl]-1H-1,2,3-benzotriaz ol-1-yl}ethyl 4-methylbenzenesulfonate (7) or 1-[2-(2-bromoethoxy)ethyl]-6-[(4-chlorophenyl)(1H-1,2,4-triazol-1-yl)met hyl]-1H-benzotriazole (8) was directly labelled via, an 18F nucleophilic substitution to give the corresponding tracer. The labelled compounds were obtained in 36-99% radioichemical yield after 75-min syntheses. The specific radioactivities are 100 GBq/mu mol for compound 1 and 80 GBq/pmol for compound 2. In vitro autoradiography using frozen rat brains illustrated specific binding in the medial amygdala, the bed nucleus of stria terminalis and the preoptic area, all of which corresponded well to the result of C-11-labelled vorozole.

Place, publisher, year, edition, pages
2008. Vol. 51, no 5, 207-212 p.
Keyword [en]
n. c. a nucleophilic, F-18-fluorination, F-18-labelled VOZ analogues, aromatase
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-110017DOI: 10.1002/jlcr.1502ISI: 000257341900001OAI: oai:DiVA.org:uu-110017DiVA: diva2:275021
Available from: 2009-11-02 Created: 2009-11-02 Last updated: 2009-11-11Bibliographically approved

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