Add time:08/29/2019         Source:sciencedirect.com

The isoquinoline carboxamide derivative 1-(2-chlorophenyl)-N-methyl-N-(1-methylpropyl)-3-isoquinoline carboxamide (PK11195) has been shown to bind strongly and selectively to the peripheral benzodiazepine receptor (PBR) binding sites. A series of PK11195 analogues have been synthesized and biologically characterized. The affinities of the analogues for the PBR were determined using in vitro competitive binding assays with [3H]PK11195 in rat kidney mitochondrial membranes. The results showed that the 1-(2-iodophenyl)-N-methyl-N-(3-fluoropropyl)-3-isoquinoline carboxamide (9a) was the most potent compound (Ki = 0.26 nM) of this series and is an excellent lead ligand for additional studies for labeling with fluorine-18 to determine whether it possesses the desired in vivo performance in non-human primates by PET imaging. Thus, radiolabeling of 9a with fluorine-18 was developed.

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