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  • Title: Synthesis of 3-(2'-furoyl)indole derivatives as potential new ligands at the benzodiazepine receptor, structurally more restrained analogues of indoleglyoxylylamides.
    Author: Da Settimo A, Primofiore G, Da Settimo F, Marini AM, Novellino E, Greco G, Martini C, Senatore G, Lucacchini A.
    Journal: Farmaco; 1995 May; 50(5):311-20. PubMed ID: 7626165.
    Abstract:
    A number of furoylindoles were synthesized with the aim of obtaining structurally more restrained analogues of the previously described indoleglyoxylylamides, which are high affinity ligands at the benzodiazepine receptor. In these new compounds, the oxygen atom of the oxalyl CO(2) is inserted into the rigid furan ring. However, unlike the glyoxylylamides, they proved to be incapable of interacting with the benzodiazepine receptor. To rationalize these results, molecular electrostatic potentials were calculated; these indicated a positive electrostatic potential region for the furan oxygen, which thus prevents the formation of a hydrogen bond necessary for interaction with the receptor. Nevertheless, these findings confirmed that the CO(2) of the indoleglyoxylylamide derivatives represents one of the principal points of interaction with the receptor site for these kinds of ligands, as previously hypothesized by us.
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