Selective <i>I</i><sub>Kur</sub> Inhibitors for the Potential Treatment of Atrial Fibrillation: Optimization of the Phenyl Quinazoline Series Leading to Clinical Candidate 5-[5-Phenyl-4-(pyridin-2-ylmethylamino)quinazolin-2-yl]pyridine-3-sulfonamide
作者:Prashantha Gunaga、John Lloyd、Somanadham Mummadi、Abhisek Banerjee、Naveen Kumar Dhondi、James Hennan、Veena Subray、Ramya Jayaram、Nagendra Rajugowda、Kommuri Umamaheshwar Reddy、Duraimurugan Kumaraguru、Umasankar Mandal、Dasthagiri Beldona、Ashok Kumar Adisechen、Navnath Yadav、Jayakumar Warrier、James A. Johnson、Harinath Sale、Siva Prasad Putlur、Ajay Saxena、Anjaneya Chimalakonda、Sandhya Mandlekar、MaryLee Conder、Dezhi Xing、Arun Kumar Gupta、Anuradha Gupta、Richard Rampulla、Arvind Mathur、Paul Levesque、Ruth R. Wexler、Heather J. Finlay
DOI:10.1021/acs.jmedchem.6b01889
日期:2017.5.11
We have recently disclosed 5-phenyl-N-(pyridin-2-ylmethyl)-2-(pyrimidin-5-yl)quinazolin-4-amine 1 as a potent I-Kur current blocker with selectivity versus hERG, Na and Ca channels, and an acceptable preclinical PK profile. Upon further characterization in vivo, compound 1 demonstrated an unacceptable level of brain penetration. In an effort to reduce the level of brain penetration while maintaining the overall profile, SAR was developed at the C2' position for a series of close analogues by employing hydrogen bond donors. As a result, 5-[5-phenyl-4-(pyridin-2-ylmethylamino)quinazolin-2-yl]pyridine-3-sulfonamide (25) was identified as the lead compound in this series. Compound 25 showed robust effects in rabbit and canine pharmacodynamic models and an acceptable cross-species pharmacokinetic profile and was advanced as the clinical candidate. Further optimization of 25 to mitigate pH-dependent absorption resulted in identification of the corresponding phosphoramide prodrug (29) with an improved solubility and pharmacokinetic profile.