Potent and Subtype-Selective Dopamine D(2) Receptor Biased Partial Agonists Discovered via an Ugi-Based Approach

[Image: see text] Using a previously unexplored, efficient, and versatile multicomponent method, we herein report the rapid generation of novel potent and subtype-selective DRD(2) biased partial agonists. This strategy exemplifies the search for diverse and previously unexplored moieties for the secondary/allosteric pharmacophore of the common phenyl-piperazine scaffold. The pharmacological characterization of the new compound series led to the identification of several ligands with excellent DRD(2) affinity and subtype selectivity and remarkable functional selectivity for either the cAMP (22a and 24d) or the β-arrestin (27a and 29c) signaling pathways. These results were further interpreted on the basis of molecular models of these ligands in complex with the recent DRD(2) crystal structures, highlighting the critical role of the secondary/allosteric pharmacophore in modulating the functional selectivity profile.