Attribution 4.0 International2024-02-142024-02-142024-01-11Tian, G. L., Hsieh, C. J., Taylor, M., Lee, J. Y., Luedtke, R. R., & Mach, R. H. (2023). Design and Synthesis of D3R Bitopic Ligands with Flexible Secondary Binding Fragments: Radioligand Binding and Computational Chemistry Studies. Molecules (Basel, Switzerland), 29(1), 123. https://doi.org/10.3390/molecules290101231420-3049https://hdl.handle.net/20.500.12503/32502A series of bitopic ligands based on Fallypride with a flexible secondary binding fragment (SBF) were prepared with the goal of preparing a D(3)R-selective compound. The effect of the flexible linker ((R,S)-trans-2a-d), SBFs ((R,S)-trans-2h-j), and the chirality of orthosteric binding fragments (OBFs) ((S,R)-trans-d, (S,R)-trans-i, (S,S)-trans-d, (S,S)-trans-i, (R,R)-trans-d, and (R,R)-trans-i) were evaluated in in vitro binding assays. Computational chemistry studies revealed that the interaction of the fragment binding to the SBF increased the distance between the pyrrolidine nitrogen and ASP110(3.32) of the D(3)R, thereby reducing the D(3)R affinity to a suboptimal level.http://creativecommons.org/licenses/by/4.0/bitopic ligandsdopamine 2 receptordopamine 3 receptorflexible linkermolecular dynamic simulationComputational ChemistryNitrogenArticle© 2023 by the authors.291