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  • Title: Indol-3-yl-tetramethylcyclopropyl ketones: effects of indole ring substitution on CB2 cannabinoid receptor activity.
    Author: Frost JM, Dart MJ, Tietje KR, Garrison TR, Grayson GK, Daza AV, El-Kouhen OF, Miller LN, Li L, Yao BB, Hsieh GC, Pai M, Zhu CZ, Chandran P, Meyer MD.
    Journal: J Med Chem; 2008 Mar 27; 51(6):1904-12. PubMed ID: 18311894.
    Abstract:
    A series of potent indol-3-yl-tetramethylcyclopropyl ketones have been prepared as CB 2 cannabinoid receptor ligands. Two unsubstituted indoles ( 5, 32) were the starting points for an investigation of the effect of indole ring substitutions on CB 2 and CB 1 binding affinities and activity in a CB 2 in vitro functional assay. Indole ring substitutions had varying effects on CB 2 and CB 1 binding, but were generally detrimental to agonist activity. Substitution on the indole ring did lead to improved CB 2/CB 1 binding selectivity in some cases (i.e., 7- 9, 15- 20). All indoles with the morpholino-ethyl side chain ( 32- 43) exhibited weaker binding affinity and less agonist activity relative to that of their tetrahydropyranyl-methyl analogs ( 5- 31). Several agonists were active in the complete Freund's adjuvant model of chronic inflammatory thermal hyperalgesia ( 32, 15).
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