Bioorganic and Medicinal Chemistry Letters 2011-Sep
Phosphodiesterase inhibitors. Part 2: design, synthesis, and structure-activity relationships of dual PDE3/4-inhibitory pyrazolo[1,5-a]pyridines with anti-inflammatory and bronchodilatory activity.
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A structural survey of pyrazolopyridine-pyridazinone phosphodiesterase (PDE) inhibitors was made with a view to optimization of their dual PDE3/4-inhibitory activity for respiratory disease applications. These studies identified (-)-6-(7-methoxy-2-trifluoromethylpyrazolo[1,5-a]pyridine-4-yl)-5-methyl-4,5-dihydro-3-(2H)-pyridazinone (KCA-1490, compound 2ac) as a compound with potent combined bronchodilatory and anti-inflammatory activity and an improved therapeutic window over roflumilast.