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Synthesis and SAR of 5-Amino- and 5-(Aminomethyl)benzofuran Histamine H 3 Receptor Antagonists with Improved Potency

2005; American Chemical Society; Volume: 48; Issue: 20 Linguagem: Inglês

10.1021/jm0504398

1520-4804

Minghua Sun, Chen Zhao, Gregory A. Gfesser, Christine Thiffault, Thomas R. Miller, Kennan C. Marsh, Jill M. Wetter, Michael A. Curtis, Ramin Faghih, Timothy A. Esbenshade, Arthur A. Hancock, Marlon Cowart,

Polyamine Metabolism and Applications

A new series of H3 receptor antagonists was discovered with nanomolar and subnanomolar affinities at human and rat H3 receptors. Starting from an earlier, more structurally limited series of benzofurans, the present series of compounds demonstrated increased structural variety and flexibility with greater in vitro potency. One compound in particular, [2-[2-(2-(R)-methylpyrrolidin-1-yl)ethyl]benzofuran-5-yl](5-nitropyridin-2-yl)amine (7h), gave the best binding potency (human K(i) of 0.05 nM, rat K(i) of 0.11 nM), which represented a 9-fold (in human) and an 11-fold (in rat) improvement over ABT-239 (compound 5), a compound previously reported to have excellent in vitro potency and in vivo efficacy. The synthesis, SAR of the H3 binding affinities, in vitro assay for phospholipidosis, and pharmacokinetic properties of the new compounds are described.