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We have established structure-activity relationships of novel truncated D-4'-thioadenosine derivatives from D-mannose as potent and selective A(3) adenosine receptor (AR) antagonists. At the human A(3) AR, most of N(6)-substituted analogues showed high potency and selectivity and acted as pure antagonists in a cyclic AMP functional assay. Among compounds tested, 2-chloro-N(6)-3-chlorobenzyl and N(6)-3-chlorobenzyl analogues displayed very high binding affinities (K(i) = 1.66 nM and 1.5 nM, respectively) at the human A(3) AR. Truncated 4'-thioadenosine derivatives studied here are regarded as an excellent template for the design of novel A(3) AR antagonists to act at both human and murine species.

Design and Synthesis of Truncated 4'-Thioadenosine Derivatives as Potent and Selective A3 Adenosine Receptor Antagonists