title: Synthesis and physicochemical assessment of novel 2-substituted 3-hydroxypyridin-4-ones, novel iron chelators.
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.
authors.affiliation: Department of Pharmacy, King's College London, UK.
authors.forename: Majid Y
authors.initials: MY
authors.lastname: Moridani
authors.forename: Gary S
authors.initials: GS
authors.lastname: Tilbrook
authors.forename: Hicham H
authors.initials: HH
authors.lastname: Khodr
authors.forename: Robert C
authors.initials: RC
authors.lastname: Hider
mesh_terms: D007502:Iron Chelating Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000627:therapeutic use; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013789:Thalassemia / Q000188:drug therapy
chemical_list: D007502:Iron Chelating Agents; D011725:Pyridines; C014047:hydroxypyridines