mild, reagent-cyanide-free, and efficient synthesis of O-phosphinoyl-protected cyanohydrins from readily available α-substituted malononitriles was realized using diarylphosphine oxides in the presence of O2. Mechanistic studies indicated that in addition to the initial aerobic oxidation of the malononitrile derivative notable features of this process include the formation of a tetrahedral intermediate
Enantioselective Assembly of Cycloenones with a Nitrile-Containing All-Carbon Quaternary Center from Malononitriles Enabled by Ni Catalysis
作者:Zhiwu Lu、Xu-Dong Hu、Hui Zhang、Xiao-Wen Zhang、Jinhui Cai、Muhammad Usman、Hengjiang Cong、Wen-Bo Liu
DOI:10.1021/jacs.0c02075
日期:2020.4.22
malononitrile derivatives is a straightforward yet underdeveloped route to construct enantioenriched nitriles. Here we report an enantioselective nickel-catalyzed desymmetrization of malononitriles for the generation of nitrile-containing all-carbon quaternary stereocenters. This protocol involves a nickel-catalyzedaddition of aryl boronic acids to alkynes followed by a selective nitrile insertion
Cobalt-Catalyzed Regio- and Enantioselective Allylic Alkylation of Malononitriles
作者:Samir Ghorai、Sajid Ur Rehman、Wen-Bin Xu、Wen-Yu Huang、Changkun Li
DOI:10.1021/acs.orglett.0c00962
日期:2020.5.1
Cobalt-catalyzed highly branched- and enantioselectiveallylicalkylation of malononitriles has been developed. Chiral γ,δ-unsaturated malononitriles could be synthesized with >20:1 branched/linear regioselectivity and up to 99% enantiomeric excess from easily accessible racemic allylic carbonates under mild reaction conditions. The electron-rich and sterically less hindered bisoxazolinephosphine ligand
Fluoroalkylative Ketonization of Malononitrile-Tethered Alkenes via Nickel Electron-Shuttle and Lewis Acid Catalysis
作者:Yangkun Zhou、Hanmin Huang
DOI:10.1021/acs.orglett.4c01415
日期:2024.5.31
efficient reductive dicarbofunctionalization of unactivatedalkenes with alkyl halides and malononitriles. The combination of Ni electron-shuttle catalysis with Eu(OTf)3, a non-redox-type Lewis acid, effectively activates the iminyl radicals, enabling the direct formation of the C(sp3)–C(sp3) bond and β-ketonitrile functionality across a variety of C═C double bonds. This reaction allows for the expedient