Chromeno[3,4-<i>c</i>]pyridin-5-ones: Selective Human Dopamine D<sub>4</sub> Receptor Antagonists as Potential Antipsychotic Agents
作者:Paul C. Unangst、Thomas Capiris、David T. Connor、Thomas G. Heffner、Robert G. MacKenzie、Steven R. Miller、Thomas A. Pugsley、Lawrence D. Wise
DOI:10.1021/jm970170v
日期:1997.8.1
chromeno[3,4-c]pyridin-5-ones with selective affinity for the dopamineD4 receptor is described. Target compounds were tested for binding to cloned human dopamine D2, D3, and D4 receptor subtypes expressed in Chinese hamster ovary (CHO) K-1 cells. Several compounds demonstrated single digit nanomolar Ki values for binding to the D4 receptor with several hundred-fold selectivities toward the D2 and D3 receptors
The synthesis of two C-11 labelled chromeno[3,4-c]pyridin-5-ones for the visualisation of the dopamine D4 receptor subtype has been developed. The production entailed an O-methylation of the O-desmethyl precursor with [C-11]iodomethane in the presence of tetrabutylammonium hydroxide. Subsequent purification by RPHPLC and formulation by tracer enrichment on a C18 Sep Pak provided a solution which was suitable for human iv injection. Specific activity of the tracer averaged 37 GBq/mu mol at EOS and the radiochemical yields were 65% (decay-corrected, based [C-11]CH3I). Total activity obtained was 5.6 - 7.4 GBq preparations have been demonstrated to be chemically radiochemically pure by HPLC.