Mechanism of Selective C–H Hydroxylation Mediated by Manganese Aminopyridine Enzyme Models
作者:Roman V. Ottenbacher、Evgenii P. Talsi、Konstantin P. Bryliakov
DOI:10.1021/cs5013206
日期:2015.1.2
oxidation of aliphatic C–H groups with H2O2 in the presence of aminopyridine Mn complexes, modeling the reactivities of natural oxygenases of the cytochrome P450 superfamily, has been examined. The oxygenation of C–H groups proceeds via hydrogen atom abstraction by the electrophilic metal site; the logarithm of C–H oxidation rates correlates linearly with bond dissociation energies for homolytic C–H bond
已经研究了在氨基吡啶Mn配合物的存在下用H 2 O 2选择性氧化脂肪族CHH基团的机理,模拟了细胞色素P450超家族天然加氧酶的反应性。C–H基团的氧合作用是通过亲电金属位点夺取氢原子来进行的;C–H氧化速率的对数与均解C–H键断裂的键解离能成线性关系。哈米特相关性和立体定向性研究反映了短寿命的电子缺陷自由基中间体的形成。同位素标记研究证实了从添加的H 2 18中引入了18 OO,因此至今仍缺乏氧锰(V)介导的氧化机制的证据。