Imidazo[2,1-i]purin-5-ones and related tricyclic water-soluble purine derivatives: potent A(2A)- and A(3)-adenosine receptor antagonists.

ABSTRACT: A series of tricyclic imidazo[2,1-i]purinones and ring-enlarged analogues derived from xanthine derivatives have been prepared as adenosine receptor (AR) antagonists. In comparison with xanthines, the tricyclic compounds exhibit increased water solubility due to a basic nitrogen atom, which can be protonated under physiological conditions. Substituents were introduced that confer high affinity for A(2A) or A(3) ARs, respectively. A new capillary electrophoresis method was developed for the determination of the enantiomeric purity of selected chiral products using native and modified beta-cyclodextrins as chiral discriminators. The compounds were investigated in radioligand binding assays at rat brain A(1) and A(2A) ARs. Selected compounds were additionally investigated in radioligand bindi

SUBMITTER: Muller CE 

PROVIDER: S-EPMC10794076 | biostudies-literature | 2002 Aug

REPOSITORIES: biostudies-literature