Rh-catalyzed aerobic oxidative cyclization of anilines, alkynes, and CO
作者:Xinyao Li、Jun Pan、Hao Wu、Ning Jiao
DOI:10.1039/c7sc02181j
日期:——
Transition-metal-catalyzed oxidative C-H cyclization of anilines has been an attractive and powerful strategy for the efficient construction of N-heterocycles. However, the primary and tertiary anilines are rarely employed in this strategy due to the relatively unstability with strong oxidants or the presence of three C-N bonds. By using aerobic oxidative protocol, we describe here a novel Rh-catalyzed
Eco-friendly acetylcholine-carboxylate bio-ionic liquids for controllable <i>N</i>-methylation and <i>N</i>-formylation using ambient CO<sub>2</sub> at low temperatures
作者:Wenfeng Zhao、Xiaoping Chi、Hu Li、Jian He、Jingxuan Long、Yufei Xu、Song Yang
DOI:10.1039/c8gc03549k
日期:——
reaction temperature under solvent or solvent-freeconditions. N-Methylamines (ca. 96% yield) were obtained in acetonitrile at 50 °C, while N-formamides (ca. 99% yield) were attained without a solvent at 30 °C. The established bio-ionic liquid catalytic system found a wide range of applicability in substrates and possessed a high potentiality in scale-up to gram-grade production. The developed catalytic
Cu-catalyzed oxidative Povarov reactions between N-alkyl N-methylanilines and saturated oxa- and thiacycles
作者:Rahul Kisan Kawade、Deepak B. Huple、Rong-Jing Lin、Rai-Shung Liu
DOI:10.1039/c5cc01287b
日期:——
Cu-catalyzed oxidative Povarov reactions between N,N-dialkylanilines and saturated oxa- or thiacycles with tert-butyl hydroperoxide (TBHP) are described.
β-Deuterium Isotope Effects on Amine Basicity, “Inductive” and Stereochemical
作者:Charles L. Perrin、Brian K. Ohta、Joshua Kuperman
DOI:10.1021/ja038343v
日期:2003.12.1
Secondary beta deuterium isotope effects on acidity constants of ammonium ions are measured using a remarkably precise NMR titration method. Deuteration is found to increase the basicity of methylamine, dimethylamine, benzylamine, and N,N-dimethylaniline. The effect is attributed to a lowered zero-point energy of a CH bond adjacent to an amine nitrogen. The method permits a determination of the stereochemical
Aerobic Oxidative EDA Catalysis: Synthesis of Tetrahydroquinolines Using an Organocatalytic EDA Active Acceptor
作者:August Runemark、Henrik Sundén
DOI:10.1021/acs.joc.1c02776
日期:2022.1.21
A catalytic electron donor–acceptor (EDA) complex for the visible-light-driven annulation reaction between activated alkenes and N,N-substituted dialkyl anilines is reported. The key photoactive complex is formed in situ between dialkylated anilines as donors and 1,2-dibenzoylethylene as a catalytic acceptor. The catalytic acceptor is regenerated by aerobic oxidation. Investigations into the mechanism