The Synthesis of 5-Functional 3-Hydroxypyridin-4-ones and Their Impact on the Chelating Properties of the Ligands
作者:Yu-Lin Chen、Jing Chen、Yongmin Ma、Robert C. Hider
DOI:10.1246/cl.141133
日期:2015.4.5
The presence of the 5-functional group on 3-hydroxypyridin-4-ones (HPOs) can significantly change their chelating properties because the 5-position is adjacent to one of the chelating moieties. A 5-methoxy-substituted HPO has been successfully synthesized using a 5-bromo analogue with NaOMe in the presence of a copper(I) catalyst. The atomic charges and stability constants of the HPOs with either electron-donating or election-withdrawing groups on the 5-position were compared. The result showed that the 5-substituted HPOs possess lower stability constants, compared to those of the 5-unsubstituted analogue (deferiprone).
3-hydroxypyridin-4-ones (HPOs)上 5-官能团的存在会显著改变其螯合特性,因为 5-位与螯合分子之一相邻。在铜(I)催化剂存在下,利用 5-溴类似物与 NaOMe 成功合成了 5-甲氧基取代的 HPO。比较了在 5 位上带有电子捐赠基团或选举撤回基团的 HPO 的原子电荷和稳定常数。结果表明,与 5 位未取代的类似物(去铁酮)相比,5 位取代的 HPO 具有较低的稳定性常数。