<i>N</i>-Demethylation of <i>N,N</i>-Dimethylanilines by the Benzotriazole <i>N</i>-Oxyl Radical: Evidence for a Two-Step Electron Transfer−Proton Transfer Mechanism
The reaction of the benzotriazole N-oxyl radical (BTNO) with a series of 4-X-N,N-dimethylanilines (X = CN, CF3, CO2CH2CH3, CH3, OC6H5, OCH3) has been investigated in CH3CN. Product analysis shows that the radical, 4-X-C6H4N(CH3)CH2•, is first formed, which can lead to the N-demethylated product or the product of coupling with BTNO. Reaction rates were found to increase significantly by increasing the
Diiodomethane-Mediated Generation of <i>N</i>-Aryliminium Ions and Subsequent [4 + 2] Cycloadditions with Olefins
作者:Yu-Quan Zhao、Jun-Jie Tian、Chong-Ren Ai、Xiao-Chen Wang
DOI:10.1021/acs.joc.9b03148
日期:2020.2.21
between N,N-dimethylanilines, diiodomethane, and olefins. This transformation involves initial reaction of the aniline with diiodomethane to form an iodomethylammonium salt, which undergoes fragmentation accompanied by elimination of methyl iodide to give an N-aryliminium ion, which is trapped by the olefin via [4 + 2] cycloaddition to give the final product. This method for generating N-aryliminium ions
N,N′-Bisalkoxycarbonyl-p-benzoquinone diimine underwent a thermal addition reaction with N,N-dimethylanilines to form an N–C bond between an imino group and an N-methyl group. Upon irradiation the reaction was accerelated. The reaction did not proceed with N-alkyl substituted anilines other than methyl.
A highly selective sp3 C–N cleavage of tertiary anilines was achieved using the TBN/TEMPO catalyst system. When N,N-diaklylanilines (alkyl, benzyl) were employed, the N–CH3 bond was selectively cleaved via radical C–Hactivation. Moreover, when the allyl group was installed, totally reverse selectivity was observed. It is worth noting that the solvent effect is also crucial to obtain high reaction
Electrochemical Oxidative C(sp
<sup>3</sup>
)−H/N−H Cross‐Coupling for
<i>N</i>
‐Mannich Bases with Hydrogen Evolution
作者:Pan Wang、Zhenlin Yang、Ting Wu、Chenyang Xu、Ziwei Wang、Aiwen Lei
DOI:10.1002/cssc.201802676
日期:2019.7.5
bases was established through electrochemical external‐oxidant‐free C(sp3)−H/N−Hcross‐coupling with hydrogen evolution. Various N‐methylanilines were explored in this transformation. Moreover, simple amides, heteroatom‐containing amides, and succinimides were well tolerated in moderate‐to‐good yields. In addition, the electrochemicaldehydrogenativeC(sp3)−H/N−Hcross‐coupling could be scaled up to 5 mmol