1,1,2,2‐Tetrahydroperoxy‐1,2‐diphenylethane was used for the efficient and metal‐free epoxidation of various α,β‐unsaturated ketones, carried out under mild alkaline conditions at room temperature.
Facile epoxidation of α, β-unsaturated ketones with urea-2,2-dihydroperoxypropane as a new oxidant
作者:Kaveh Khosravi、Shirin Naserifar
DOI:10.1007/s13738-016-0980-1
日期:2017.2
AbstractVarious aromatic α, β-unsaturatedketones were successfully transformed into their corresponding epoxides using urea-2,2-dihydroperoxypropane as the oxygen source for the first time. The reactions were carried out under mild alkaline conditions at room temperature in high yields and short reaction times. Graphical Abstract
Selectfluor-Mediated Simultaneous Cleavage of C–O and C–C Bonds in α,β-Epoxy Ketones Under Transition-Metal-Free Conditions: A Route to 1,2-Diketones
作者:Heng Wang、Shaobo Ren、Jian Zhang、Wei Zhang、Yunkui Liu
DOI:10.1021/acs.joc.5b00857
日期:2015.7.2
Selectfluor-mediated simultaneous cleavage of C–O and C–C bonds in α,β-epoxyketones has been successfully achieved under transition-metal-free conditions. The reaction gives 1,2-diketone compounds in moderate to good yields involving a ring-opening/benzoyl rearrangement/C–C bond cleavage sequence under oxidative conditions.
An Ionic Manganeseporphyrin Catalyst for Alkene Epoxidations: The Significant Roles of the Cationic Trimethylbenzylammonium Functionalities and the Anionic Mercaptopropionate Counterions
作者:Ye Liu、Yueqin Cai、Yong Lu、Ming-Yuan He、Qingxia Wan
DOI:10.1055/s-2008-1032062
日期:2008.2
An ionic manganeseporphyrin, bearing cationic trimethylbenzylammonium functionalities and mercaptopropionate [HS(CH2)2CO2 -] counteranions, was synthesized and applied as a catalyst for alkene epoxidations using iodosylbenzene (PhIO) as an oxidant. The reactions proceeded with high activity and oxide selectivity, and the catalyst exhibited relatively good recyclability. It was found that the presence of thiol (SH) group and quaternary ammonium substituents contributed greatly to the improved activity and stability of this ionic manganeseporphyrin. This was due to the synergistic effects of HS(CH2)2CO2 - as an axial ligand, and the suppression of oxidation degradation by the strongly electron-withdrawing nature of the quaternary ammonium cations.
Solvent-Free Synthesis of 1,3-Diphenyl-5-arylpyrazole Derivatives
作者:Ji-Tai Li、Ying Yin、Xian-Tao Meng
DOI:10.2174/157017809788681383
日期:2009.7.1
The synthesis of 1,3-diphenyl-5-arylpyrazoles via the reactions of 2,3-epoxy-1-phenyl-3-aryl-1-propanones with phenylhydrazine was carried out in 48-84% yields at 230 °C under solvent-free condition within 1.5 h. This method provides several advantages such as operational simplicity, higher yield and solvent-free.
该方法通过 2,3-环氧-1-苯基-3-芳基-1-丙酮与苯肼的反应合成 1,3-二苯基-5-芳基吡唑,在 230 °C 无溶剂条件下 1.5 小时内产率达到 48-84%。