Visible-light-mediated tungsten-catalyzed C-H amination of unactivated alkanes with nitroarenes
作者:Qing Wang、Shengyang Ni、Xiaochen Wang、Yi Wang、Yi Pan
DOI:10.1007/s11426-021-1170-2
日期:2022.4
pharmaceutical and material sciences. The existing reports of C-H amination are limited to ammonia, diazo and azide nitrogen sources. This work describes a rapid construction of C-N bonds from accessible nitroarene and alkane feedstock under decatungstate catalysis. A variety of C-H precursors including gaseous, linear, cyclic and benzylic hydrocarbons could adopt this protocol to afford the corresponding alkylamines
Copper(II) Anilides in sp<sup>3</sup> C-H Amination
作者:Eun Sil Jang、Claire L. McMullin、Martina Käß、Karsten Meyer、Thomas R. Cundari、Timothy H. Warren
DOI:10.1021/ja5026547
日期:2014.8.6
We report a series of novel beta-diketiminato copper(II) anilides [Cl2NN]Cu-NHAr that participate in C-H amination. Reaction of H2NAr (Ar = 2,4,6-Cl3C6H2 (Ar-Cl3), 3,5-(CF3)(2)C6H3 (Ar-F6), or 2-py) with the copper(II) t-butoxide complex [Cl2NN]-Cu-(OBu)-O-t yields the corresponding copper(II) anilides [Cl2NN]-Cu-NHAr. X-ray diffraction of these species reveal three different bonding modes for the anilido moiety: kappa(1)-N in the trigonal [Cl2NN]Cu-NHArCl3 to dinuclear bridging in [Cl2NN]Cu}(2)(mu-NHArF6)(2) and kappa(2)-N,N in the square planar [Cl2NN]Cu(kappa(2)-NH-2-py). Magnetic data reveal a weak antiferromagnetic interaction through a pi-stacking arrangement of [Cl2NN]Cu-NHArCl3; solution EPR data are consistent with monomeric species. Reaction of [Cl2NN]Cu-NHAr with hydrocarbons R-H (R-H = ethylbenzene and cyclohexane) reveals inefficient stoichiometric C-H amination with these copper(II) anilides. More rapid C-H amination takes place, however, when (BuOOBu)-Bu-t-Bu-t is used, which allows for HAA of R-H to occur from the (BuO center dot)-Bu-t radical generated by reaction of [Cl2NN]Cu and (BuOOBu)-Bu-t-Bu-t. The principal role of these copper(II) anilides [Cl2NN]Cu-NHAr is to capture the radical R-center dot generated from HAA by (BuO center dot)-Bu-t to give functionalized aniline R-NHAr, resulting in a novel amino variant of the Kharasch-Sosnovsky reaction.
Catalytic CH Amination with Aromatic Amines
作者:Raymond T. Gephart、Daria L. Huang、Mae Joanne B. Aguila、Graham Schmidt、Andi Shahu、Timothy H. Warren
DOI:10.1002/anie.201201921
日期:2012.6.25
A β‐diketiminato copper(I) catalyst enables CHamination of anilines employing low catalyst loadings to preclude oxidation to the diazene ArNNAr (see scheme). Electron‐poor anilines are particularly resistant towards diazene formation and participate in the amination of strong and unactivated CH bonds. N‐alkyl anilines also take part in CHamination.