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  • Title: Synthesis of anthranylaldoxime derivatives as estrogen receptor ligands and computational prediction of binding modes.
    Author: Tuccinardi T, Bertini S, Martinelli A, Minutolo F, Ortore G, Placanica G, Prota G, Rapposelli S, Carlson KE, Katzenellenbogen JA, Macchia M.
    Journal: J Med Chem; 2006 Aug 10; 49(16):5001-12. PubMed ID: 16884312.
    Abstract:
    N-Me-anthranylaldoximes possess a hydrogen-bonded pseudocyclic A' ring in place of the typical phenolic A-ring that is characteristic of most estrogen receptor (ER) ligands. We have investigated the role played by substituents introduced into either one or both of the peripheral 3- and 4-phenyl rings in modulating ER binding affinity. An efficient synthetic strategy was employed for the preparation of differentially substituted 3- and 4-aryl derivatives that involved exploiting the different reactivity of bromo- versus chloro-aryl groups in palladium-catalyzed cross-couplings. The binding data showed that ERalpha affinity could be improved by a single p-OH group in the 4-phenyl ring, whereas the same substitution on the 3-phenyl ring caused a dramatic reduction of ERbeta affinity. The most ERalpha-selective compound was the one with two p-OH groups on both phenyl substituents. To rationalize these results, ligand docking followed by molecular mechanics Poisson-Boltzmann/surface area (MM-PBSA) studies were carried out. These analyses suggested a molecular basis for the interaction of these compounds with the ERs and enabled the development of models able to predict the mode of ligand binding.
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