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• W2054654803 abstract "NNC 22-0010 is a new dopamine antagonist with a high affinity and selectivity for D1 receptors in vitro. NNC 22-0010 has both an N-methyl group and a bromine, which allows radiolabelling with either 11C or 76Br. We labelled [11C]NNC 22-0010 by N-methylation of the free base of the secondary amine with [11C]methyl iodide in a total radiochemical yield of 40%. The total synthesis time was 30 min. The specific radioactivity at time of injection of the radioligand was 48 to 55 GBq/mumol. The [76Br]NNC 22-0010 was synthesized from the iodine precursor by an exchange reaction with 76Br using a Cu(+)-assisted nucleophilic substitution reaction. The radiochemical yield was 60% after purification. Specific radioactivity at time of injection of the radioligand was 6 to 20 GBq/mumol. In PET experiments with [11C]NNC 22-0010 and [76Br]NNC 22-0010 there was a rapid uptake of radioactivity in the monkey brain. The striatum-to-cerebellum ratio was 2-2.5 after 1 h. Binding in the striatum was displaced by SCH 23390, whereas binding in the cerebellum was not reduced. Metabolite studies showed that 1 h after injection about 20% of the radioactivity in plasma represented unchanged radioligand. This value was on the same level for at least 6 h. The results indicate that radiolabelled NNC 22-0010 has potential for imaging dopamine D1 receptors selectively in the human brain." @default.
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• W2054654803 date "1996-08-01" @default.
• W2054654803 modified "2023-10-14" @default.
• W2054654803 title "11C- and 76Br-labelled NNC 22-0010, selective dopamine D1 receptor radioligands for PET" @default.
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• W2054654803 doi "https://doi.org/10.1016/0969-8051(96)00083-2" @default.
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