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  • Title: Conformationally restricted analogues of remoxipride as potential antipsychotic agents.
    Author: Norman MH, Kelley JL, Hollingsworth EB.
    Journal: J Med Chem; 1993 Oct 29; 36(22):3417-23. PubMed ID: 7901417.
    Abstract:
    Several conformationally restricted derivatives of (S)-3-bromo-N-((1-ethyl-2-pyrrolidinyl)methyl)-2,6-dimethoxybenzamide (remoxipride) were synthesized and evaluated in vitro for their ability to inhibit [3H]raclopride binding at the dopamine D-2 receptor. The cyclic benzamides designed to mimic the intramolecular hydrogen bonding of desmethylremoxipride (4, FLA-797) included 2,3-dihydro-4H-1,3-benzoxazin-4-ones, 2,3-dihydro-4H-1,3-benzthiazin-4-ones, phthalimides, 1-isoindolinones, 1,2-benzisothiazol-3(2H)-ones, and 1,2-benzisothiazol-3(2H)-one 1,1-dioxides. In this series, enhanced affinities to the dopamine D-2 receptor were not observed. The phthalimidine analogue 24b ((S)-6-chloro-2-(1-ethylpyrrolidinyl)-1-isoindolinone) exhibited the highest affinity to the dopamine D-2 receptor with an IC50 of 1.3 microM, which was equipotent to remoxipride.
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