The discovery of a new series of selective and high-affinity α1-adrenoceptor (α1-AR) ligands, characterized by a 1H-pyrrolo [2, 3-d]-pyrimidine-2, 4 (3H, 7H)-dione system, is described in this paper. Some synthesized compounds, including 20, 22, and 30, displayed affinity in the nanomolar range for α1-ARs and substantial selectivity with respect to 5-HT1A and dopaminergic D1 and D2 receptors. Functional assays, performed on selected ...