Synthesis of β-Methylsulfonylated N-Heterocycles from Saturated Cyclic Amines with the Insertion of Sulfur Dioxide
作者:Yan He、Jintao Yang、Qimeng Liu、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.0c02368
日期:2020.12.4
An efficient synthesis of β-methylsulfonylated N-heterocycles via FeCl3-catalyzed C(sp3)–H dehydrogenation and C(sp2)–H methylsulfonylation of inactivated cyclic amines with the promotion and participation of inorganic sodium metabisulfite and dicumyl peroxide (DCP) has been developed. Notably, bifunctional DCP acted not only as an oxidant to promote the dehydrogenation but also as a methyl radical
Amination of Aryl Halides Mediated by Electrogenerated Nickel from Sacrificial Anode
作者:Farah Daili、Stéphane Sengmany、Eric Léonel
DOI:10.1002/ejoc.202100194
日期:2021.5.7
C(sp2)−N bond formation only mediated by nickel salts electrogenerated from the sacrificial anode has been investigated for the first time to prepare functionalized arylamine derivatives. The cross‐couplings are performed under constant current electrolysis, in an undivided cell, and without additional ligand at room temperature.
General Paradigm in Photoredox Nickel‐Catalyzed Cross‐Coupling Allows for Light‐Free Access to Reactivity
作者:Rui Sun、Yangzhong Qin、Daniel G. Nocera
DOI:10.1002/anie.201916398
日期:2020.6.8
Self‐sustained NiI/III cycles are established as a potentially generalparadigm in photoredox Ni‐catalyzed carbon–heteroatom cross‐coupling reactions through a strategy that allows us to recapitulate photoredox‐like reactivity in the absence of light across a wide range of substrates in the amination, etherification, and esterification of aryl bromides, the latter of which has remained, hitherto, elusive
自我维持的Ni I / III循环被确立为光氧化还原Ni催化的碳-杂原子交叉偶联反应中的潜在一般范式,其策略是使我们能够在没有光的情况下在各种各样的底物上重现类似光氧化还原的反应性。在芳基溴化物的胺化,醚化和酯化反应中,迄今为止,后者在热镍催化下仍然难以捉摸。此外,在没有光照的情况下酯化的可及性尤其显着,因为先前在光氧化还原条件下对该转化进行的机理研究一致地调用了能量转移介导的途径。
Selective Cleavage and Tunable Functionalization of the C–C/C–N Bonds of <i>N</i>-Arylpiperidines Promoted by <sup><i>t</i></sup>BuONO
作者:Yan He、Zhi Zheng、Yajie Liu、Jiajie Qiao、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.orglett.9b00226
日期:2019.3.15
In this paper, selectivecleavage and tunable functionalization of the inert C–C/C–N bonds in N-arylpiperidines promoted by tBuONO under metal-free conditions is presented. To be specific, when the reaction was run in acetonitrile in the presence of molecular sieves, the synthetically useful acyclic N-formyl nitriles are formed. On the other hand, when alcohol was used as the reaction medium, the corresponding
Direct Base-Assisted C-N Bond Formation between Aryl Halides and Aliphatic Tertiary Amines under Transition-Metal-Free Conditions
作者:Yang Fang、Yueqin Zheng、Zhiyong Wang
DOI:10.1002/ejoc.201101618
日期:2012.3
Direct base-mediated amination of aryl halides with aliphatictertiary amines via an aryne intermediate was developed under transition-metal-free conditions. This operationally simple C–N bond-coupling protocol could tolerate a variety of functionalized aryl halides as well as several aliphatictertiary amines. Moreover, this environmentally benign process provides a new strategy for direct C–N bond