Solvent-mediated switching between oxidative addition and addition–oxidation: access to β-hydroxysulfides and β-arylsulfones by the addition of thiols to olefins in the presence of Oxone
作者:Soumen Payra、Navin Yadav、Jarugu Narasimha Moorthy
DOI:10.1039/d1nj04892a
日期:——
The reaction between aryl olefins and thiols in the presence of Oxone in toluene–water (9 : 1, v/v) affords β-hydroxy-2-arylethyl aryl sulfides smoothly by the interception of intermediary thiyl radicals with aryl olefins; the former are generated by the oxidation of thiols with Oxone in a biphasic medium. However, the change of the solvent system to acetonitrile–water facilitates a nonradical and
芳基烯烃和硫醇在 Oxone 存在下在甲苯-水 (9 : 1, v/v) 中的反应通过拦截中间硫基自由基与芳基烯烃顺利地提供 β-羟基-2-芳基乙基芳基硫化物;前者是通过在双相介质中用 Oxone 氧化硫醇产生的。然而,将溶剂系统改为乙腈 - 水促进了非自由基和协同途径,仅通过串联点击反应,然后氧化。本质上,在甲苯-水介质中促进了“氧化加成”,而在乙腈-水介质中促进了“加成-氧化”。鉴于 Oxone 易于获得、环境友好且价格低廉,溶剂介导的转换构成了对两种不同产品的轻松直接访问,即 β-羟基-2-芳基乙基芳基硫化物和 2-芳基乙基芳基砜。