RT Journal Article T1 Exploring Non-orthosteric Interactions with a Series of Potent and Selective A3 Antagonists A1 Miranda Pastoriza, Darío A1 Bernárdez Alfaya, Rodrigo A1 Azuaje Guerrero, Jhonny Alberto A1 Prieto Díaz, Rubén A1 Majellaro, Maria A1 Tamhankar, Ashish V. A1 Koenekoop, Lucien A1 González García, Alejandro A1 Gioé Gallo, Claudia A1 Mallo-Abreu, Ana A1 Brea Floriani, José Manuel A1 Loza García, María Isabel A1 García Rey, Aitor A1 García Mera, Xerardo A1 Gutiérrez de Terán, Hugo A1 Sotelo Pérez, Eddy K1 A3 Adenosine receptors K1 Adenosine antagonists K1 Pyrimidines K1 Ugi reaction K1 Multicomponent reactions AB A library of potent and highly A3AR selective pyrimidine-based compounds was designed to explore non-orthosteric interactions within this receptor. Starting from a prototypical orthosteric A3AR antagonist (ISVY130), the structure-based design explored functionalized residues at the exocyclic amide L1 region and aimed to provide additional interactions outside the A3AR orthosteric site. The novel ligands were assembled through an efficient and succinct synthetic approach, resulting in compounds that retain the A3AR potent and selective profile while improving the solubility of the original scaffold. The experimentally demonstrated tolerability of the L1 region to structural functionalization was further assessed by molecular dynamics simulations, giving hints of the non-orthosteric interactions explored by these series. The results pave the way to explore newly functionalized A3AR ligands, including covalent drugs and molecular probes for diagnostic and delivery purposes PB ACS Publications SN 1948-5875 YR 2022 FD 2022 LK http://hdl.handle.net/10347/29225 UL http://hdl.handle.net/10347/29225 LA eng NO ACS Med. Chem. Lett. 2022, 13, 2, 243–249 NO This work has received financial support from the Consellería de Cultura, Educación e Ordenación Universitaria [Galician Government (grant: ED431B 2020/43)], the Xunta de Galicia (Centro singular de investigación de Galicia accreditation 2019-2022, ED431G 2019/03), the European Union (European Regional Development Fund - ERDF), the Swedish Research Council (grant: 521-2014-2118), and the Swedish strategic research program eSSENCE. The computational studies were conducted with the resources available from the Swedish National Infrastructure for Computing (SNIC). The project was carried out within the framework of the collaborative EU COST action ERNEST (CA18133) DS Minerva RD 28 abr 2026