A Highly Efficient Heterogeneous Ruthenium-Catalysed Oxidative α-Cyanation of Tertiary Amines Leading to α-Aminonitriles
作者:Xiaoming Wang、Ruian Xiao、Jingting Ai、Mingzhong Cai
DOI:10.3184/174751917x15064232103065
日期:2017.10
Oxidative α-cyanation of tertiaryamines was achieved by using an MCM-41-immobilised N-alkylethylenediamine ruthenium(III) complex (MCM-41-2N-RuCl3) as catalyst in MeOH at 60 °C in the presence of H2O2 as oxidant and NaCN in acetic acid as a cyanide source to afford the corresponding α-aminonitriles in good yields. The new heterogeneous ruthenium catalyst can easily be prepared by a simple two-step
Controlling One- or Two-Electron Oxidation for Selective Amine Functionalization by Alternating Current Frequency
作者:Disni Gunasekera、Jyoti P. Mahajan、Yanick Wanzi、Sachini Rodrigo、Wei Liu、Ting Tan、Long Luo
DOI:10.1021/jacs.2c02605
日期:2022.6.8
Here, we report a unique electrosynthetic method that enables the selective one-electron oxidation of tertiaryamines to generate α-amino radical intermediates over two-electron oxidation to iminium cations, providing easy access to arylation products by simply applying an optimal alternating current (AC) frequency. More importantly, we have discovered an electrochemical descriptor from cyclic voltammetry
PIFA-Promoted, Solvent-Controlled Selective Functionalization of C(sp<sup>2</sup>)–H or C(sp<sup>3</sup>)–H: Nitration via C–N Bond Cleavage of CH<sub>3</sub>NO<sub>2</sub>, Cyanation, or Oxygenation in Water
作者:Chandrashekar Mudithanapelli、Lama Prema Dhorma、Mi-hyun Kim
DOI:10.1021/acs.orglett.9b00751
日期:2019.5.3
CH3NO2) mediated by [bis(trifluoroacetoxy)iodo]benzene (PIFA) is described. The NO2 transfer from CH3NO2 to the aromatic group of the substrate is possible with careful selection of the solvent, NaX, and oxidant. In addition, the solvent-controlled C(sp2)–H functionalization can shift to an α-C(sp3)–H functionalization (cyanation or oxygenation) of the α-C(sp3)–H of cyclic amines.
描述了由[双(三氟乙酰氧基)碘]苯(PIFA)介导的新型硝化作用(通过C(sp 3)–N破坏/ C(sp 2)–N与CH 3 NO 2形成)。的NO 2从CH转印3 NO 2到基板的芳族基团是可能的溶剂,的NaX,和氧化剂的仔细选择。此外,溶剂控制的C(SP 2)-H官能化可转移到一个α-C(SP 3)-H官能的α-C(SP的(氰化或氧合)3)-H的环胺。
Ruthenium-Catalyzed Oxidative Cyanation of Tertiary Amines with Molecular Oxygen or Hydrogen Peroxide and Sodium Cyanide: sp<sup>3</sup> C−H Bond Activation and Carbon−Carbon Bond Formation
demonstration of direct sp(3) C-H bondactivation alpha to nitrogen followed by carbon-carbonbond formation under aerobic oxidation conditions. The catalytic oxidation seems to proceed by (i) alpha-C-H activation of tertiary amines by the ruthenium catalyst to give an iminium ion/ruthenium hydride intermediate, (ii) reaction with molecular oxygen to give an iminium ion/ruthenium hydroperoxide, (iii)