Toward the Definition of Stereochemical Requirements for MT<sub>2</sub>-Selective Antagonists and Partial Agonists by Studying 4-Phenyl-2-propionamidotetralin Derivatives
New derivatives of 4-phenyl-2-propionamidotetralin (4-P-PDOT) were prepared and tested on cloned MT1 and MT2 receptors, with the purpose of merging previously reported pharmacophores for nonselective agonists and for MT2-selective antagonists. A 8-methoxy group increases binding affinity of both (±)-cis- and (±)-trans-4-P-PDOT, and it can be bioisosterically replaced by a bromine. Conformational analysis