Studies on galactose oxidase active site model complexes: effects of ring substituents on Cu(II)-phenoxyl radical formation
作者:Yuichi Shimazaki、Stefan Huth、Shun Hirota、Osamu Yamauchi
DOI:10.1016/s0020-1693(01)00781-2
日期:2002.3
Copper(II) complexes of new N 3 O- and N 2 O 2 -donor tripodal ligands bearing one or two o -substituted phenol moieties have been synthesized as models for the galactose oxidase active site. The complexes of 2-[ N -(1-methyl-2′-imidazolylmethyl)- N -(6″-methyl-2″-pyridylmethyl)-aminomethyl)]-4-methyl-6-methylthiophenol (MeSL), [Cu(MeSL)Cl], and N -(6-methyl-2-pyridylmethyl)- N , N -bis(2′-hydroxy-3′
已经合成了带有一个或两个邻位取代的酚部分的新的N 3 O-和N 2 O 2-供体三脚架配体的铜(II)配合物,作为半乳糖氧化酶活性位点的模型。2- [N-(1-甲基-2'-咪唑基甲基)-N-(6″-甲基-2″-吡啶基甲基)-氨基甲基)]-4-甲基-6-甲硫基苯酚(MeSL)的络合物,[Cu (MeSL)Cl]和N-(6-甲基-2-吡啶基甲基)-N,N-双(2'-羟基-3',5'-二叔丁基苄基)胺(t-buL2mepy),[通过X射线结构分析已揭示出Cu(t-buL2mepy)(H 2 O)]具有在基面上分别具有一个和两个酚氧的氧的正方形金字塔形结构。通过电化学或Ce(IV)氧化将[Cu(MeSL)Cl]转化为Cu(II)-邻甲基硫代苯氧基基团。类似配合物中的邻甲氧基苯氧基自由基比2稳定得多 4-二(叔丁基)苯氧基。当t-buL2mepy与Cu(ClO 4)2反应得到[Cu(t-buL2mepy)(H