Fluorine-18 labeled benzamides for studying the dopamine D2 receptor with positron emission tomography
作者:Robert H. Mach、Robert R. Leudtke、Christopher D. Unsworth、Virginia A. Boundy、Peggy A. Nowak、James G. Scripko、S. Todd Elder、Joseph R. Jackson、Patricia L. Hoffman
DOI:10.1021/jm00075a028
日期:1993.11
Two series of (N-benzylpiperidin-4-yl)- and (9-azabicyclo[3.3.1]nonan-3beta-yl)benzamides were prepared, and in vitro binding assays were used to measure the affinity of these compounds for dopamine D2, dopamine D3, serotonin 5-HT2, and alpha2-adrenergic receptors. The results of these studies indicated compounds 23, 26b, and 34 have the selectivity needed for in vivo studies of the D2 (and possibly D3) receptors. F-18-Labeled analogues of 23, 26b and 34 were prepared by N-alkylation of the corresponding desbenzyl precursors with [F-18]-4-fluorobenzyl iodide. Preliminary in vivo studies demonstrated that [F-18]-23 and [F-18]-26b are suitable candidates for further evaluation in positron emission tomography imaging studies. The slow rate of washout of [F-18]-34 from nondopaminergic regions and its comparatively high lipophilicity indicates that this compound may not be suitable for imaging studies because of a high level of nonspecific binding.