Allosteric Modulation of the Adenosine A<sub>1</sub> Receptor. Synthesis and Biological Evaluation of Novel 2-Amino-3-benzoylthiophenes as Allosteric Enhancers of Agonist Binding
作者:Pieter A. M. van der Klein、Angeliki P. Kourounakis、Ad P. IJzerman
DOI:10.1021/jm991051d
日期:1999.9.1
Novel allosteric enhancers of agonist binding to the rat adenosine Al receptor are described. The lead compound for the new series was PD 81,723 ((2-amino-4,5-dimethyl-3-thienyl)[3(trifluoromethyl)phenyl]methanone), a compound previously reported by Bruns and co-workers (Mol. Pharmacol. 1990, 38, 950-958). The 4,5-dimethyl group and the benzoyl moiety were targets for further modifications, leading to series of 4,5-dialkyl (12a-g), of tetrahydrobenzo (12h-u), and of tetrahydropyridine (13a-g) derivatives. A number of compounds, in particular 12b, 12e, 12j, 12n, and 12u, proved superior to PD 81,723, Their EC50 values for enhancing the binding of the adenosine Al receptor agonist N-6-cyclopentyladenosine to the receptor were lower, and/or their antagonistic activity on the adenosine Al receptor was shown to be diminished.