Visible-light- induced aerobic dioxygenation of styrenes under metal- and additive-free ambient conditions
摘要:
Visible light promoted hydroperoxidation of styrenes using hydroxylamine and molecular oxygen from air under metal-free and additive-free conditions at room temperature is described. Hydroperoxides were further converted into corresponding hydroxy compounds and a-oxygenated ketones in high yields under ambient conditions. (C) 2016 Elsevier Ltd. All rights reserved.
An efficient catalytic approach for the synthesis of substituted peroxides, alcohols, and ketones through a catalyst-controlledhighlyselective dioxygenation of olefins has been demonstrated. The reported methods are mild and practical, can be switched by the selection of different catalytic systems, and employ peroxide as an oxidant and a reagent at room temperature.
Selective C O bond formation: highly efficient radical dioxygenation of alkenes initiated by catalytic amount of tert-butyl hydroperoxide
作者:Xiao-Feng Xia、Su-Li Zhu、Qing-Tao Hu、Chao Chen
DOI:10.1016/j.tet.2016.10.029
日期:2016.12
A highlyselective radical dioxygenation of alkenes using hydroxamic acid and O2 with 5–10 mol % of tert-butyl hydroperoxide as a catalyst was developed. On the basis of this newly developed strategy, a wide range of phenylethanol derivatives with a variety of functional groups can be effectively synthesized.
A practical and simple selectfluor mediated highly selectiveradical dioxygenation of alkenes was achieved under mild conditions. Various hydroxylamines, such as N-Hydroxyphthalimide (NHPI), N-hydroxybenzotriazole (HOBt) and N-hydroxysuccinimide (NHSI), could react...
surfactant, the tert-butyl hydroperoxide-mediated dioxygenation of styrene with molecular oxygen and N-hydroxyphthalimide was achieved in water at room temperature, providing the corresponding dioxygenated products in 9–93% yield. This facile method is eco-friendly, feasible on gram scale, and applicable to a wide range of styrene derivatives with a variety of functional groups.
The catalytic epoxidation of alkenes by molecular oxygen activated in the systemcontainingN-hydroxyphthalimide (NHPI) and active alkenes such as styrene, 2-norbornene or indene is reported. The transient intermediates, alkyl hydroperoxides formed by autoxidation of NHPI and the active alkenes are proposed as oxygen sources which transfer mono-oxygen to MnIIITPPCl.
据报道,烯烃在含N-羟基邻苯二甲酰亚胺(NHPI)和活性烯烃(如苯乙烯,2-降冰片烯或茚)的体系中被分子氧活化而催化环氧化。提出了过渡中间体,通过NHPI的自氧化形成的烷基氢过氧化物和活性烯烃作为将单氧转移到Mn III TPPCl的氧源。