Optimization of Chromeno[2,3‑c]pyrrol-9(2H)‑ones as Highly Potent, Selective, and Orally Bioavailable PDE5 Inhibitors: Structure–Activity Relationship, X‑ray Crystal Structure, and Pharmacodynamic Effect on Pulmonary Arterial Hypertension
journal contributionposted on 27.08.2018 by Deyan Wu, Yadan Huang, Yiping Chen, Yi-You Huang, Haiju Geng, Tianhua Zhang, Chen Zhang, Zhe Li, Lei Guo, Jianwen Chen, Hai-Bin Luo
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To further explore the structure–activity relationship around the chromeno[2,3-c]pyrrol-9(2H)-one scaffold, 19 derivatives as inhibitors against PDE5 were discovered. The most potent inhibitor 3 has an IC50 of 0.32 nM with remarkable selectivity and druglike profile. Oral administration of 3 (1.25 mg/kg) caused comparable therapeutic effects to sildenafil (10.0 mg/kg) against pulmonary arterial hypertension. Further, different binding patterns from sildenafil were revealed in cocrystal structures, which provide structural templates for discovery of highly potent PDE5 inhibitors.