Identification and optimization of novel 2-(4-oxo-2-aryl-quinazolin-3(4H)-yl)acetamide vasopressin V3 (V1b) receptor antagonists

The discovery, synthesis, and preliminary structure–activity relationship (SAR) of a novel class of vasopressin V3 (V1b) receptor antagonists is described. Compound 1, identified by high throughput screening of a diverse, three million-member compound collection, prepared using ECLiPS™ technology, had good activity in a V3 binding assay (IC50 = 0.20 μM), but less than desirable physicochemical properties. Optimization of compound 1 yielded potent analogs 19 (IC50 = 0.31 μM) and 24 (IC50 = 0.12 μM) with improved drug-like characteristics

Synthesis and SAR studies of novel 2-(4-oxo-2-aryl-quinazolin-3(4H)-yl)acetamide vasopressin V1b receptor antagonists

Synthesis and structure–activity relationships (SAR) of a novel series of vasopressin V1b (V3) antagonists are described. 2-(4-Oxo-2-aryl-quinazolin-3(4H)-yl)acetamides have been identified with low nanomolar affinity for the V1b receptor and good selectivity with respect to related receptors V1a, V2 and oxytocin (OT). Optimised compound 12j demonstrates a good pharmacokinetic profile and activity in a mechanistic model of HPA dysfunction