Efficient electrophilic and nucleophilic epoxidations utilizing a sulfonylperoxy radical and peroxysulfate species
作者:Min Young Park、Seung Gak Yang、Yong Hae Kim
DOI:10.1002/hc.10078
日期:——
((TBA)2S2O8, 2) was prepared by the reaction of tetrabutylammonium hydrogen sulfate with potassium peroxydisulfate. The epoxidation of enals and enones, such as α,β-unsaturated aldehydes or ketones, was efficiently achieved with 2 in the presence of hydrogen peroxide and base in acetonitrile or in methanol at 25°C. A base-sensitive substrate, such as cinnamaldehyde, could be successfully epoxidized under
超氧阴离子自由基(O2-·)与邻硝基苯磺酰氯反应生成具有强氧化能力的邻硝基苯磺酰过氧自由基,该自由基能够将芳基亚甲基部分氧化成芳基酮和相对富电子的烯烃区域选择性氧化成环氧化物。氧化性物质暂时归因于结构 1 的邻硝基苯磺酰基过氧自由基。四丁基过二硫酸铵 ((TBA)2S2O8,2) 是通过四丁基硫酸氢铵与过二硫酸钾反应制备的。在过氧化氢和碱的存在下,在乙腈或甲醇中,在 25°C 下,使用 2 可以有效地实现烯醛和烯酮(例如 α,β-不饱和醛或酮)的环氧化。碱敏感底物,如肉桂醛,可以在温和的反应条件和较短的反应时间内成功地环氧化。© 2002 Wiley Periodicals, Inc. 杂原子化学 13:431–436, 2002; 在线发表于 Wiley Interscience (www.interscience.wiley.com)。DOI 10.1002/hc.10078