A2B Adenosine Receptor Antagonists with Picomolar Potency

  • J Med Chem. 2019 Apr 25;62(8):4032-4055. doi: 10.1021/acs.jmedchem.9b00071.
Jie Jiang  1 ,  Catharina Julia Seel  1 ,  Ahmed Temirak  1 ,  Vigneshwaran Namasivayam  1 ,  Antonella Arridu  1 ,  Jakub Schabikowski  1 ,  Younis Baqi  2 ,  Sonja Hinz  1 ,  Jörg Hockemeyer  1 ,  Christa E Müller  1
Affiliations
  • 1. Pharmaceutical Chemistry I, PharmaCenter Bonn, Pharmaceutical Institute , Rheinische Friedrich-Wilhelms-Universitat Bonn , An der Immenburg 4 , D-53121 Bonn , Germany.
  • 2. Department of Chemistry, Faculty of Science , Sultan Qaboos University , P.O. Box 36, 123 Muscat , Oman.
PMID: 30835463 DOI: 10.1021/acs.jmedchem.9b00071
Abstract

The A2B Adenosine Receptor (A2BAR) was proposed as a novel target for the (immuno)therapy of Cancer since A2BAR blockade results in antiproliferative, antiangiogenic, antimetastatic, and immunostimulatory effects. In this study, we explored the structure-activity relationships of xanthin-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 selectivity 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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