Methylation of Tethered Thiolates in [(bme-daco)Zn]<sub>2</sub> and [(bme-daco)Cd]<sub>2</sub> as a Model of Zinc Sulfur-Methylation Proteins
作者:Craig A. Grapperhaus、Thawatchai Tuntulani、Joseph H. Reibenspies、Marcetta Y. Darensbourg
DOI:10.1021/ic971599f
日期:1998.8.1
The dimeric dithiolate complex [1,5-bis(mercaptoethyl)-1,5-diazacyclooctanato]zinc(II), [(bme-daco)Zn](2) or Zn-1, and its cadmium analogue, Cd-1, were investigated as models for the active site of zinc-dependent methylation proteins. The key issue addressed was whether alkylation of a thiolate in a relatively rigid tetradentate ligand would result in coordination of the thioether product to the metal
二聚二硫醇盐络合物[1,5-双(巯基乙基)-1,5-二氮杂环辛基]锌(II),[(bme-daco)Zn](2)或Zn-1,及其镉类似物Cd-1,作为锌依赖性甲基化蛋白活性位点的模型进行了研究。解决的关键问题是在相对刚性的四齿配体中硫醇盐的烷基化是否会导致硫醚产物与金属的配位。基于(1)H和(13)C NMR光谱以及对烷基化剂的相似反应性,建议新合成的镉配合物Cd-1与以前报道的Zn-1配合物同构。 X射线晶体学在固态下是二聚体(Tuntulani,T。; Reibenspies,JH; Farmer,PJ; Darensbourg,MY Inorg.Chem.1992,31,3497)。碘甲烷与热CH(3)OH / CH(3)CN中的Zn-1反应生成解离的硫醚,由伪四面体复合物中的碘化物配位取代,(Me(2)bme-daco)ZnI(2)或锌2。配合物Zn-2在三斜晶P&onemacr中结晶。a