Bioisosterism of the adenine and 8-azaadenine nuclei was demonstrated by comparison of A(1) adenosine receptor binding affinity of 2-phenyl N-6-substituted adenines and the corresponding 8-azaadenines. Some of these new compounds are very potent A, adenosine receptor antagonists. This work also describes the synthesis and A(1) adenosine receptor binding of the enantiomers of some 2-phenyladenines substituted with a 1-phenylethyl chiral group in N-6 and N(9) positions. Biological results, showing the same stereoselectivity for all the couples of enantiomers, may supply proof for the hypothesis of a possible double arrangement of 2-phenylsubstituted adenines inside A, adenosine receptors. Theoretical studies, based on an improved A, adenosine receptor model and consisting of evaluation and comparison of interaction energies in complexes involving some selected chiral ligands, support the above hypothesis.
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