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Selective, high affinity A(2B) adenosine receptor antagonists: N-1 monosubstituted 8-(pyrazol-4-yl)xanthines
Rao V Kalla1, Elfatih Elzein, Thao Perry
1Department of Bioorganic Chemistry, CV Therapeutics Inc., 3172 Porter Drive, Palo Alto, CA 94304, USA.
Abstract:
A series of N-1 monosubstituted 8-pyrazolyl xanthines have been synthesized and evaluated for their affinity for the adenosine receptors (AdoRs). We have discovered two compounds 18 (CVT-7124) and 28 (CVT-6694) that display good affinity for the A(2B) AdoR (K(i)=6 nM and 7 nM, respectively) and greater selectivity for the human A(1), A(2A), and A(3) AdoRs (>1000-, >830-, and >1500-fold; >850-, >700-, and >1280-fold, respectively). CVT-6694 has been shown to block the release of interleukin-6 and monocyte chemotactic protein-1 from bronchial smooth muscle cells (BSMC), a process believed to be promoted by activation of A(2B) AdoR.
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