title: Synthesis and pharmacological evaluation of pentacyclic 6a,7-dihydrodiindole and 2,3-dihydrodiindole derivatives as novel melatoninergic ligands.
abstract: The synthesis of novel melatonin analogues 3a and 4a-c designed as melatonin receptor ligands is described. Among the newly synthesized ligands, 2-((S)-2-hydroxymethylindolin-1-ylmethyl)-melatonin 4b displayed the highest affinity for MT(1) receptors (K(i)=9.8 nM) and for MT(2) subtype (K(i)=7.8 nM), whereas the rigid pentacyclic ligand 3 showed the highest selectivity towards the MT(2) receptor subtype (K(i)=319.3 nM for MT(1) and K(i)=65.2 nM for MT(2)).
authors.affiliation: Pharmaceutical Institute, Pharmaceutical Chemistry Division, University of Würzburg, Am Hubland, 97074 Würzburg, Germany. atia@pzlc.uni-wuerzburg.de
authors.forename: Mohamed I
authors.initials: MI
authors.lastname: Attia
authors.forename: Paula A
authors.initials: PA
authors.lastname: Witt-Enderby
authors.forename: Justin
authors.initials: J
authors.lastname: Julius
mesh_terms: D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D003412:Cricetulus; D007211:Indoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D020128:Inhibitory Concentration 50; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008550:Melatonin / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D011083:Polycyclic Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D044122:Receptor, Melatonin, MT1 / Q000737:chemistry* / Q000378:metabolism; D044123:Receptor, Melatonin, MT2 / Q000737:chemistry* / Q000378:metabolism; D021241:Spectrometry, Mass, Electrospray Ionization; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D007211:Indoles; D008024:Ligands; D011083:Polycyclic Compounds; D044122:Receptor, Melatonin, MT1; D044123:Receptor, Melatonin, MT2; D008550:Melatonin