Copper-Catalyzed Oxidative Acetalization of Boronic Esters: An Umpolung Strategy for Cyclic Acetal Synthesis
作者:Eric M. Miller、Maciej A. Walczak
DOI:10.1021/acs.joc.0c00720
日期:2020.6.19
copper, and the conditions proved to be mild and were amenable to a variety of functional groups. We expanded the Chan–Lam coupling to include C(sp3) nucleophiles and converted them into corresponding acetals. This method allows for the orthogonal acetalization of substrates with reactive, acid-sensitive functional groups.
A Metal–Organic Framework with Exceptional Activity for C−H Bond Amination
作者:Le Wang、Douglas W. Agnew、Xiao Yu、Joshua S. Figueroa、Seth M. Cohen
DOI:10.1002/anie.201709420
日期:2018.1.8
development of catalysts capable of fast, robust C−Hbondamination under mild conditions is an unrealized goal despite substantial progress in the field of C−H activation in recent years. A Mn‐based metal–organicframework (CPF‐5) is described that promotes the direct amination of C−H bonds with exceptionalactivity. CPF‐5 is capable of functionalizing C−H bonds in an intermolecular fashion with unrivaled
A one-pot, two-step approach to prepare 2-tetrahydrofuran and -pyran substituted 1,3-dicarbonyl compounds by PhI=NTs-mediated amination/Brønsted base-catalyzed cross dehydrogenative coupling (CDC) reaction of the cyclic ether and 1,3-dicarbonyl derivative under mild conditions is reported. The reaction is compatible with a variety of cyclic ethers and 1,3-dicarbonyl compounds, affording the corresponding coupled products in moderate to good yields of up to 80% over two steps.
Iron-catalyzed efficient intermolecular amination of C(sp<sup>3</sup>)–H bonds with bromamine-T as nitrene source
作者:Haiyu Wang、Yuxi Li、Zhiming Wang、Jun Lou、Yuling Xiao、Guofu Qiu、Xianming Hu、Hans-Josef Altenbach、Peng Liu
DOI:10.1039/c4ra02240h
日期:——
[Fe(N4Py)(CH3CN)](ClO4)2 can efficiently catalyze intermolecular nitrene insertion of sp3 C–H bonds with bromamine-T as the nitrene source, forming the desired tosylprotected amines with NaBr as the by-product.
Facile Amine Formation by Intermolecular Catalytic Amidation of Carbon−Hydrogen Bonds
作者:Manuel R. Fructos、Swiatoslaw Trofimenko、M. Mar Díaz-Requejo、Pedro J. Pérez
DOI:10.1021/ja0627850
日期:2006.9.1
A simple copper-based catalytic system has been developed for the carbon-hydrogen amidation reaction. The copper-homoscorpionate complex Tp(Br3)Cu(NCMe) catalyzes the transfer of the nitrene unit NTs (Ts = p-toluenesulfonyl) and its subsequent insertion into the sp(3) C-H bonds of alkyl aromatic and cyclic ethers or the sp(2) C-H bonds of benzene using PhI=NTs as the nitrene source, affording the corresponding