申请人:The Regents of the University of California
公开号:US05624901A1
公开(公告)日:1997-04-29
Disclosed is a series of improved metal chelating agents, which are highly effective upon both injection and oral administration; several of the most effective are of low toxicity. These chelating agents incorporate within their structure 1-hydroxy-2-pyridinone (1,2-HOPO) and 3-hydroxy-2-pyridinone (3,2-HOPO) moieties with a substituted carbamoyl group ortho to the hydroxy or oxo groups of the hydroxypyridinone ring. The electron-withdrawing carbamoyl group increases the acidity of the hydroxypyridinones. In the metal complexes of said chelating agents, the amide protons form very strong hydrogen bonds with its adjacent HOPO oxygen donor, making these complexes very stable at physiological conditions. The terminal N-substituents provides a certain degree of lipophilicity to said 3,2-HOPO, increasing oral activity. Also disclosed is a method of making the chelating agents and a method of producing a known compound, 3-hydroxy-1-alkyl-2(1H)pyridinone, used as a precursor to the chelating agent, safely and in large quantities.
揭示了一系列改进的金属螯合剂,这些螯合剂在注射和口服给药时均非常有效;其中一些最有效的螯合剂毒性较低。这些螯合剂的结构中包含了1-羟基-2-吡啶酮(1,2-HOPO)和3-羟基-2-吡啶酮(3,2-HOPO)基团,其取代的氨甲酰基团位于羟基吡啶酮环的羟基或氧基的邻位。电子吸引的氨甲酰基团增加了羟基吡啶酮的酸度。在这些螯合剂的金属络合物中,酰胺质子与其相邻的HOPO氧供体形成非常强的氢键,使这些络合物在生理条件下非常稳定。末端的N取代基为3,2-HOPO提供了一定程度的亲脂性,增加了口服活性。此外,还公开了一种制备这些螯合剂的方法以及一种生产已知化合物3-羟基-1-烷基-2(1H)吡啶酮的方法,该化合物用作螯合剂的前体,可以安全地大量生产。