Solvent-Dependent Reaction Pathways Operating in Copper(II) Tetrafluoroborate Promoted Oxidative Ring-Opening Reactions of Cyclopropyl Silyl Ethers
作者:Eietsu Hasegawa、Kazuki Nemoto、Ryosuke Nagumo、Eiji Tayama、Hajime Iwamoto
DOI:10.1021/acs.joc.5b02827
日期:2016.4.1
observed solvent effects that govern the reaction pathways followed are a consequence of varying solvation of copper intermediates, which governs their reactivity and redox properties. In addition, the influence of counteranions of the copper salts, organonitriles, cyclic dienes, and substrate structures on the pathways followed in these reactions was also examined.
研究了四氟硼酸铜(II)促进的苯稠合双环环丙基甲硅烷基醚的氧化开环反应。发现环丙烷开环的区域选择性以及产物分布高度依赖于溶剂的性质。在醇中,由外部键断裂产生的二聚体物质是主要产物。自由基重排产物也在溶剂如乙醚和乙酸乙酯中形成。相反,由内部键裂解产生的向碳正离子中间体的亲核加成主要发生在乙腈中发生的反应中。建议观察到的支配反应路径的溶剂效应是铜中间体溶剂化变化的结果,铜溶剂化决定了它们的反应性和氧化还原性能。此外,