3,4-Dihydropyrimidin-2(1H)-ones as Antagonists of the Human A2B Adenosine Receptor: Optimization, Structure–Activity Relationship Studies, and Enantiospecific Recognition
We describe the discovery and optimization of 3,4-dihydropyrimidin-2(1H)-ones as a novel family of (nonzanthine) A(2B) receptor antagonists that exhibit an unusually high selectivity profile. The Biginelli-based hit optimization process enabled a thoughtful exploration of the structure-activity and structure-selectivity relationships for this chemotype, enabling the identification of ligands that combine structural simplicity with excellent hA(2B) AdoR affinity and remarkable selectivity profiles.