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A2B Adenosine Receptor Antagonists with Picomolar Potency.
Journal of Medicinal Chemistry 2019 March 6
The A2B adenosine receptor (A2BAR) was proposed as a novel target for the (immuno)therapy of cancer since A2BAR blockade results in antiproliferative, anti-angiogenic, anti-metastatic, and immu-no-stimulatory effects. In this study, we explored the structure-activity relationships of xan-thin-8-yl-benzenesulfonamides mainly by introducing a variety of linkers and substituents attached to the sulfonamide residue. A new, convergent strategy was established which facilitated the synthesis of the target compounds. Many of the new compounds exhibited subnanomolar affinity for the A2BAR combined with high selectivity. Functional groups were introduced which will allow the attachment of dyes and other reporter groups. 8 (4-((4-(4-Bromophenyl)piperazin-1-yl)sulfonyl)phenyl)-1-propylxanthine (34, PSB-1901) was the most potent A2B-antagonist (Ki 0.0835 nM, KB 0.0598 nM, human A2BAR) with >10,000-fold selectiv-ity versus all other AR subtypes. It was similarly potent and selective at the mouse A2BAR, making it a promising tool for preclinical studies. Computational studies predicted halogen bonding to contribute to the outstanding potency of 34.
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