Design, synthesis, and biological evaluation of 8-biarylquinolines: A novel class of PDE4 inhibitors

The structure–activity relationship of a novel series of 8-biarylquinolines acting as type 4 phosphodiesterase (PDE4) inhibitors is described herein. Prototypical compounds from this series are potent and non-selective inhibitors of the four distinct PDE4 (IC50 < 10 nM) isozymes (A–D). In a human whole blood in vitro assay, they inhibit (IC50 < 0.5 μM) the LPS-induced release of the cytokine TNF-α. Optimized inhibitors were evaluated in vivo for efficacy in an ovalbumin-induced bronchoconstriction model in conscious guinea pigs. Their propensity to produce an emetic response was evaluated by performing pharmacokinetic studies in squirrel monkeys. This work has led to the identification of several compounds with excellent in vitro and in vivo profiles, including a good therapeutic window of efficacy over emesis.

Graphical abstractThe structure–activity relationship of a novel series of 8-biarylquinolines acting as type 4 phosphodiesterase (PDE4) inhibitors is described herein. Prototypical compounds from this series are potent (IC50 < 10 nM) but displayed little or no isozyme specificity. Optimized inhibitors were evaluated in vivo for efficacy in an ovalbumin-induced bronchoconstriction model in conscious guinea pigs. This work has led to the identification of compounds 14 and 28 which display excellent in vitro and in vivo profiles, including a good therapeutic window of efficacy over emesis.Figure optionsDownload full-size imageDownload as PowerPoint slide