Abstract
Using clearance and brain penetration studies as a screen, tetrahydroisoquinoline 3 was identified as a lead having low clearance in rats (CLb 20 ml/min/kg). Introduction of a 7-CF 3SO 2O- substituent into the tetrahydroisoquinoline, followed by replacement of the biphenylamido group of 3 by a 3-indolylpropenamido group gave 31, having high D 3 receptor affinity (pKi 8.4) and 150 fold selectivity over the D 2 receptor.
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