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Mapping the Catechol Binding Site in Dopamine D 1 Receptors: Synthesis and Evaluation of Two Parallel Series of Bicyclic Dopamine Analogues
Author(s) -
Bonner Lisa A.,
Laban Uros,
Chemel Benjamin R.,
Juncosa Jose I.,
Lill Markus A.,
Watts Val J.,
Nichols David E.
Publication year - 2011
Publication title -
chemmedchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.817
H-Index - 100
eISSN - 1860-7187
pISSN - 1860-7179
DOI - 10.1002/cmdc.201100010
Subject(s) - chemistry , catechol , stereochemistry , bicyclic molecule , moiety , intramolecular force , selectivity , hydrogen bond , dopamine , receptor , molecule , biochemistry , organic chemistry , neuroscience , biology , catalysis
A novel class of isochroman dopamine analogues, originally reported by Abbott Laboratories, have >100‐fold selectivity for D 1 ‐like over D 2 ‐like receptors. We synthesized a parallel series of chroman compounds and showed that repositioning the oxygen atom in the heterocyclic ring decreases potency and confers D 2 ‐like receptor selectivity to these compounds. In silico modeling supports the hypothesis that the altered pharmacology for the chroman series is due to potential intramolecular hydrogen bonding between the oxygen in the chroman ring and the meta ‐hydroxy group of the catechol moiety. This interaction realigns the catechol hydroxy groups and disrupts key interactions between these ligands and critical serine residues in TM5 of the D 1 ‐like receptors. This hypothesis was tested by the synthesis and pharmacological evaluation of a parallel series of carbocyclic compounds. Our results suggest that if the potential for intramolecular hydrogen bonding is removed, D 1 ‐like receptor potency and selectivity are restored.