Aryl diazo compounds and diazonium salts as potential irreversible probes of the GABA receptor

TL;DRAbstract

The synthesis of different diazonium salts derived from homo- and heterocyclic aromatic amines bearing anionic residues is described. The chemical stabilities of these compounds were established at different pH's, and the compounds were tested accordingly in binding experiments for the rat brain gamma-aminobutyric acid (GABA) receptor, for which they could ultimately be used as irreversible affinity or photoaffinity probes. The aromatic heterocyclic series studied were 2-aminoimidazole, 2-aminothiazole, and 4-aminopyridine N-oxide. The derived diazonium salts are unstable compounds at neutral pH unless they are able to be deprotonated to the corresponding diazo form. As such, the 2-diazoimidazole-4(5)-acetic acid (3b) is stable in neutral medium and recognizes the GABA receptor (IC50 = 70 microM). The homocyclic aromatic diazonium salts showed sufficient stability to be tested in binding experiments. The diazonium salts derived from m-sulfanilic acid and 8-sulfonaphthylamine were the m

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