Thermodynamic and kinetic investigation of monoketo-aldehyde-peroxyhemiacetal (MKA), a stereolabile degradation product of dihydroartemisinin
作者:D. Kotoni、M. Piras、W. Cabri、F. Giorgi、A. Mazzanti、M. Pierini、M. Quaglia、C. Villani、F. Gasparrini
DOI:10.1039/c4ra00879k
日期:——
that MKA may be formed under essentially physiological conditions (organic-aqueous environments buffered at pH 7.4) or prepared by the acid decomposition of DHA in water to afford yields that, however, do not reach 50%. We report here a more convenient procedure of preparation at room temperature. Owing to its hemiacetal nature, MKA was expected to occur in solution as a mixture of α and β epimers. In
单烯醛-过氧半缩醛(MKA)是一种双氢青蒿素(DHA)衍生物,仍然具有显着(ng级)的体外抗疟活性,但神经毒性低于其前体。通过文献已知,MKA可以在基本生理条件下形成(pH 7.4缓冲的有机水环境),也可以通过DHA在水中的酸分解制备,以提供产率,但达不到50%。我们在这里报告了一种更方便的室温制备方法。由于其半缩醛性质,预期MKA以α和β的混合物形式存在于溶液中差向异构体。在本研究中这一点,实际上,已经通过动态色谱测量,这允许突出显示为证实MKA,所述β ⇆ α比慢平衡的3倍左右为DHA。考虑到MKA在温和的酸和碱条件下都倾向于从DHA衍生出来,因此在其母体药物的生产和储存阶段可能形成MKA,并且在生理环境中也被广泛期待。因此,对这种DHA降解产物的认识的提高可能对合理开发DHA纯度分析新方法产生有益的影响。在其药物制剂中,以及考虑到MKA的α和β差向异构体的混合物在体内可表达的生物活性