Research Letter: Structural Combination of Established 5-HT2A Receptor Ligands: New Aspects of the Binding Mode
作者:Vasko Kramer、Matthias M. Herth、Martin A. Santini、Mikael Palner、Gitte M. Knudsen、Frank Rösch
DOI:10.1111/j.1747-0285.2010.01011.x
日期:2010.10
MH.MZ, MDL 100907, and altanserin are structurally similar 4‐benzoyl‐piperidine derivatives and are well accommodated to receptor interaction models. We combined structural elements of different high‐affinity and selective 5‐HT2A antagonists, as MH.MZ, altanserin, and SR 46349B, to improve the binding properties of new compounds. Three new derivatives were synthesized with a 4‐benzoyl‐piperidine moiety as the lead structure. The in vitro affinity of the novel compounds was determined by a [3H]MDL 100907 competition binding assay. The combination of MH.MZ and SR 46349B resulted in a compound (8) with a moderate affinity toward the 5‐HT2A receptor (Ki = 57 nm). The remarkably reduced affinity of other compounds (4a), (4b), and (4c) (Ki = 411, 360 and 356 nm respectively) indicates that MH.MZ can only bind to the 5‐HT2A receptor with the p‐fluorophenylethyl residue in a sterically restricted hydrophobic binding pocket.