1-Alkyl-8-(piperazine-1-sulfonyl)phenylxanthines: Development and Characterization of Adenosine A<sub>2B</sub> Receptor Antagonists and a New Radioligand with Subnanomolar Affinity and Subtype Specificity
作者:Thomas Borrmann、Sonja Hinz、Daniela C. G. Bertarelli、Wenjin Li、Nicole C. Florin、Anja B. Scheiff、Christa E. Müller
DOI:10.1021/jm900413e
日期:2009.7.9
A new series of 1-alkyl-8-(piperazine-1-sulfonyl)phenylxanthines was designed, synthesized, and characterized in radioligand binding and functional assays at A(2B) adenosine receptors. A(2B) antagonists with subnanomolar affinity and high selectivity were discovered. The most potent compounds were 1-ethyl-8-(4-(4-(4-trifluoromethylbenzyl)piperazine-1-sulfonyl)phenyl)xanthine (24, PSB-09120, K-i (human A(2B)) = 0. 157 nM) and 8-(4-(4-(4-chlorobenzyl)piperazine-1-sulfonyl)phenyl)-1-propylxanthine (17, PSB-0788, K-i (human A2(B)) = 0.393 nM). Moreover, 8-(4-(4-(4-chlorophenyl)piperazine-1-sulfonyl)phenyl)-1-propylxanthine (35, PSB-603) was developed as an A(2B)-specific antagonist exhibiting a Ki value of 0.553 nM at the human A2B receptor and virtually no affinity for the human and rat A(1) and A(2A) and the human A(3) receptors up to a concentration of 10 mu M. A tritiated form of the compound was prepared as a new radioligand and characterized in kinetic, saturation, and competition studies. It was shown to be a useful pharmacological tool for the selective labeling of human as well as rodent A(2B) receptors (K-D human A(2B) 0.403 nM, mouse A(2B) 0.351 nM).
Preparation, Properties, Reactions, and Adenosine Receptor Affinities of Sulfophenylxanthine Nitrophenyl Esters: Toward the Development of Sulfonic Acid Prodrugs with Peroral Bioavailability
作者:Luo Yan、Christa E. Müller
DOI:10.1021/jm0310030
日期:2004.2.1
esters of p-sulfophenylxanthine derivatives were synthesized as model compounds. The target xanthine derivatives were obtained in high yields by condensation of the appropriate 5,6-diaminouracils with 4-(nitrophenoxysulfonyl)benzoic acids in the presence of a carbodiimide, followed by ring closure with polyphosphoric acid trimethylsilyl ester. The chemical and enzymatic stability of the m-nitrophenyl
A<sub>2B</sub> Adenosine Receptor Antagonists with Picomolar Potency
作者:Jie Jiang、Catharina Julia Seel、Ahmed Temirak、Vigneshwaran Namasivayam、Antonella Arridu、Jakub Schabikowski、Younis Baqi、Sonja Hinz、Jörg Hockemeyer、Christa E. Müller
DOI:10.1021/acs.jmedchem.9b00071
日期:2019.4.25
The A(2B) adenosine receptor (A(2B)AR) was proposed as a novel target for the (immuno)therapy of cancer since A(2B)AR 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 A(2B)AR 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 A(2B)-antagonist (K-i 0.0835 nM, K-B 0.0598 nM, human A(2B)AR) with >10 000-fold selectivity versus all other AR subtypes. It was similarly potent and selective at the mouse A(2B)AR, making it a promising tool for preclinical studies. Computational studies predicted halogen bonding to contribute to the outstanding potency of 34.