Iron(II) Complexes of Sterically Bulky α-Ketocarboxylates. Structural Models for α-Ketoacid-Dependent Nonheme Iron Halogenases
作者:Seth J. Friese、Benjamin E. Kucera、Victor G. Young、Lawrence Que、William B. Tolman
DOI:10.1021/ic701823y
日期:2008.2.18
the iron(II) complexes LFeCl 2 [L = N, N, N', N'-tetramethylpropylenediamine (Me 4pda) or 6,6'-dimethyl-2,2'-bipyridine (dmby)] yielded LFe(Cl)(MesBF) ( 1 or 2). X-ray crystal structures of these complexes showed that they closely model the active site structure of the nonheme iron halogenase enzyme SyrB2. A similar synthetic procedure using benzoylformate with L = dmby yielded (dmby)Fe[(O 2CC(O)Ph)]
位阻2,6-二(甲磺酰基)苯甲酰基甲酸酯的甲酸酯(MesBF)与铁(II)配合物LFeCl 2 [L = N,N,N',N'-四甲基丙烯二胺(Me 4pda)或6, 6′-二甲基-2,2′-联吡啶(dmby)]产生LFe(Cl)(MesBF)(1或2)。这些配合物的X射线晶体结构表明,它们紧密模拟了非血红素铁卤化酶SyrB2的活性位点结构。使用L = dmby的苯甲酰甲酸酯的类似合成方法可制得(dmby)Fe [(O 2CC(O)Ph)] 2(3),这表明需要位阻α-酮羧酸酯来组装卤化酶模型化合物。为了在不同空间性质的苯甲酰基甲酸酯的结构相关的铁(II)配合物中进行反应性比较,制备了[LFe(O 2CC(O)Ar)] n(4- 6)配合物,其中L′=三(吡啶基甲基)胺(tpa)和Ar = 2,6-二甲苯基苯基,2,6-二对甲苯基苯基或2,4,6-三甲基苯基。后两种情况(5和6)的X射线结构显示为双核拓扑结构(n