Optimization of Substituted N-3-Benzylimidazoquinazolinone Sulfonamides as Potent and Selective PDE5 Inhibitors
Journal of Medicinal Chemistry2000Vol. 43(26), pp. 5037–5043
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David P. Rotella, Zhong Sun, Yeheng Zhu, John Krupinski, Ronald Pongrac, Laurie Seliger, Diane E. Normandin, John E. Macor
Abstract
A previous report from these laboratories identified the N-3-benzylimidazoquinazolinone nucleus as a more selective PDE5 inhibitor template compared to the pyrazolopyrimidine of sildenafil. This paper describes in detail the structure-activity relationships of a set of sulfonamide analogues, several of which are both more potent and more selective PDE5 inhibitors in vitro than sildenafil. The synthesis, in vitro enzyme activity and selectivity, and in vitro functional and preclinical pharmacokinetic assessment of molecules in this series are described.
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