Discovery of a Novel Lung-Restricted ALK5 Inhibitor for the Treatment of Idiopathic Pulmonary Fibrosis.

As part of a therapeutic approach to idiopathic pulmonary fibrosis (IPF) using inhaled ALK5 inhibitors, which enable targeted lung delivery while minimizing systemic side effects, this work describes the optimization process of a previously reported series featuring a 4,6-disubstituted pyridazine core. The medicinal chemistry exploration, aimed at increasing cellular potency while keeping physicochemical and ADME properties favorable for inhalation, was directed to the functionalization of the 3-position in the pyridazine core. An efficient SAR exploration, supported by a late-stage functionalization (LSF) approach, led to the identification of a small set of compounds worthy of in vivo characterization. Compound 20 showed a persistent and lung-restricted target engagement in a pharmacodynamic model, which well-correlated with its in vitro solubility measured in simulated lung fluid (SLF). When tested in a mouse model of lung fibrosis, 20 showed remarkable efficacy, thus representing an advanced lead candidate for the development of topical antifibrotic therapeutics.