Redox inactive metal ion triggered N-dealkylation by an iron catalyst with dioxygen activation: a lesson from lipoxygenases
作者:Jisheng Zhang、Yujuan Wang、Nengchao Luo、Zhuqi Chen、Kangbing Wu、Guochuan Yin
DOI:10.1039/c5dt00804b
日期:——
added Lewis acids like Zn2+ through a plausible chloride or OTf− bridge, which has promoted the redox potential of iron(III) species. The amine oxidation mechanism was also discussed based on the available data, which resembles the co-oxidase activity of lipoxygenases in oxidative dealkylation of xenobiotic metabolisms where an external electron donor is not essential for dioxygen activation.
在环境温度下利用双氧作为终端氧化剂一直是氧化还原化学领域的挑战,因为很难将稳定的氧化还原金属离子(如铁(III))氧化为高氧化态以初始化催化循环。受脂氧合酶的双氧合和共氧化酶活性的启发,在此,我们引入了另一种方案来激活具有非氧化还原金属离子的缓慢的铁(III)物种,这可以促进其氧化能力,从而促进底物被双氧合氧化,从而初始化催化循环。在N,N-二甲基苯胺及其类似物的氧化中,将Zn(OTf)2添加到[Fe(TPA)Cl 2] Cl催化剂可引发胺被双氧氧化,而单独的[Fe(TPA)Cl 2 ] Cl则反应缓慢。在化学计量氧化中,还证实了Zn(OTf)2的存在可以明显改善[Fe(TPA)Cl 2 ] Cl络合物的电子转移能力。使用不同类型的底物作为捕集剂的实验表明,铁(IV)物种不会在催化循环中发生,这表明胺的氧化是通过电子转移而不是氢提取来初始化的。UV-Vis,高分辨率质谱,电化学,EPR和氧