Reaction of nucleophiles with electron acceptors by SN2 or electron transfer (ET) mechanisms: tert-butyl peroxybenzoate/dimethyl sulfide and benzoyl peroxide/N,N-dimethylaniline systems
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
Visible‐Light Catalyzed [1+2+2] Cycloaddition Reactions Enabled by the Formation of Methylene Nitrones
作者:Jing Guo、Ying Xie、Wen‐Tian Zeng、Qiao‐Lei Wu、Jiang Weng、Gui Lu
DOI:10.1002/adsc.202000858
日期:2020.12.8
Nitrones are key intermediates in organic synthesis. Herein, we report the first photo‐redox synthesis of methylene nitrone intermediates from nitroarenes and arylamines. The highly reactive methylene nitrones are in situ trapped by alkenes to afford various isoxazolidines. This three‐component reaction features the use of N,N‐dimethylanilines or N‐aryl glycines as C1 building blocks, which allow for
Photoredox‐Catalyzed Tandem Demethylation of
<i>N</i>
,
<i>N</i>
‐Dimethyl Anilines Followed by Amidation with α‐Keto or Alkynyl Carboxylic Acids
作者:Pritha Das、Hasina Mamataj Begam、Samir Kumar Bhunia、Ranjan Jana
DOI:10.1002/adsc.201900525
日期:2019.9.3
for highly selective monodemethylation of N,N‐dimethyl anilines to generate secondary amines and subsequent coupling with α‐ketocarboxylic acids or alkynyl carboxylic acids to form α‐ketoamides or alkynamides respectively undervisiblelight photoredox catalyst in a single operation. From the deuterium‐labeling experiment, it was probed that demethylation is the slowest step in this tandem process
Cr-Catalyzed Direct <i>ortho</i>-Aminomethylation of Phenols
作者:Junbin Shi、Yubin Wang、Qingqing Bu、Binyuan Liu、Bin Dai、Ning Liu
DOI:10.1021/acs.joc.1c01406
日期:2021.12.17
through the direct and efficient ortho-aminomethylation of N,N-dimethylanilines with phenols. The approach showed excellent site selectivity at the ortho-position of phenols and accommodated broad substrate scope and functional group compatibility for both N,N-dimethylanilines and phenols. Mechanistic studies revealed that the direct ortho-aminomethylation between N,N-dimethylanilines and phenols occurred
我们开发了一种 Cr 催化的策略,用于通过N,N-二甲基苯胺与苯酚的直接且有效的邻氨基甲基化来区域选择性地形成 C sp 2 -C sp 3键。该方法在苯酚的邻位显示出优异的位点选择性,并适应N,N-二甲基苯胺和苯酚的广泛底物范围和官能团相容性。机理研究表明,N,N-二甲基苯胺和苯酚之间的直接邻氨基甲基化是通过离子机制发生的。
The conformation of N-nitroso-N-methylaniline from microwave spectroscopy
作者:W. Caminati、A.G. Giumanini
DOI:10.1016/0022-2860(87)87057-6
日期:1987.11
Abstract The low resolution microwave spectrum of N-nitro,N-methylaniline shows only one series of μa R-branch bands. The value of B + C = 1584.6 MHz is consistent with this being the rotamer in which the benzene ring is exo to the nitroso group. The high resolution microwave spectra of the normal. CD3 and two meta-D species show conclusively that this rotamer has a non-polar heavy atom skeleton. The
摘要 N-硝基,N-甲基苯胺的低分辨微波光谱仅显示出一系列μa R-支带。B + C = 1584.6 MHz 的值与苯环在亚硝基外的旋转异构体一致。正常的高分辨率微波光谱。CD3 和两个元 D 物种最终表明该旋转异构体具有非极性重原子骨架。基于苯胺和N,N-二甲基亚硝胺结构的分子模型很好地再现了旋转常数、量Δc(= Ia + Ib - Ic)和取代坐标,其中苯环平面扭曲了≅相对于分子其余部分的重原子平面成 30°。