Discovery and Synthesis of (<i>S</i>)-3-[2-(3,4-Dimethoxyphenyl)ethoxy]-2- (4,6-dimethylpyrimidin-2-yloxy)-3,3-diphenylpropionic Acid (LU 302872), a Novel Orally Active Mixed ET<sub>A</sub>/ET<sub>B</sub> Receptor Antagonist
作者:Willi Amberg、Stefan Hergenröder、Heinz Hillen、Rolf Jansen、Georg Kettschau、Andreas Kling、Dagmar Klinge、Manfred Raschack、Hartmut Riechers、Liliane Unger
DOI:10.1021/jm9910425
日期:1999.8.1
Structural variation of the endothelin A-selective antagonist (S)-3-methoxy-2-(4,6-dimethoxy-pyrimidin-2-yloxy)-3,3-diphenylpropionic acid (LU 135252) led to analogues which retain ETA affinity but exhibit substantial ETB affinity as well. The most active derivative obtained is (S)-3- [2-(3,4-dimethoxyphenyl)ethoxy]-2-(4,6-dimethylpyrimidin-2-yloxy)-3,3-diphenylpropionic acid (LU 302872), which can be prepared in enantiomerically pure form in eight steps via an acid-catalyzed transetherification. It has a K-i = 2.15 nM far binding to the ETA receptor and a K-i = 4.75 nM for binding to the ETB receptor, is orally available, and antagonizes the big ET-induced blood pressure increase in rats and the big ET-induced bronchospasm in guinea pigs each time at a dose of 10 mg/kg.