Abstract
Novel 3-hydroxypyridin-4-one containing tridentate ligands were synthesised and their physicochemical properties characterised, including ionisation constants and stoichiometric titration with Fe(III). There is an urgent demand for orally active iron chelators with potential for the treatment of thalassaemia. In principle, tridentate ligands are likely to be more kinetically stable than bidentate molecules, but to date no satisfactory molecules have been identified. Fe(III) stability constants were assessed by competition with the hexadentate ligand EDTA. In all cases no evidence was found for a tridentate mode of iron chelation; instead the ligands behaved as bidentate hydroxypyridinones. As a consequence they provide no advantage over the more simple alkyl hydroxypyridinones.
标题:摘要
新型含三齿
配体的3-
羟基吡啶-4-酮被合成,并对其物理
化学性质进行了表征,包括电离常数和与Fe(III)的
化学计量滴定。目前急需口服活性
铁螯合剂,以潜在治疗地中海贫血。原则上,三齿
配体可能比双齿分子更具动力学稳定性,但迄今尚未找到令人满意的分子。通过与六齿
配体EDTA竞争评估了Fe(III)的稳定常数。在所有情况下,均未发现三齿
铁螯合模式的证据;相反,
配体表现为双齿
羟基吡啶酮。因此,它们与更简单的烷基
羟基吡啶酮相比并无优势。