Rhodium-Catalyzed Regioselective Amination of Secondary Allylic Trichloroacetimidates with Unactivated Aromatic Amines
作者:Jeffrey S. Arnold、Robert F. Stone、Hien M. Nguyen
DOI:10.1021/ol1019025
日期:2010.10.15
The use of unactivated aromatic amines in the rhodium-catalyzed regioselective amination of secondary allylic trichloroacetimidates is explored. The desired N-arylamines are obtained in high yields and regioselectivity, favoring the branched amination products. The presence of the trichloroacetimidate leaving group was found to be critical for successful regioselective amination reactions with unactivated
Traceless Benzylic C−H Amination via Bifunctional
<i>N</i>
‐Aminopyridinium Intermediates
作者:Pritam Roychowdhury、Roberto G. Herrera、Hao Tan、David C. Powers
DOI:10.1002/anie.202200665
日期:2022.7.11
C−Hamination chemistry viatracelessbifunctional nitrogen activation is reported. Sequential C−H aminopyridylation followed by Ni-catalyzed cross-coupling with aryl boronic acids affords the products of aryl nitrene insertion into C−H bonds. These products are unavailable by direct nitrene insertion due to the intrinsic instability of aryl nitrenes. The described method can be applied in the context
Enantioselective Rhodium-Catalyzed Synthesis of Branched Allylic Amines by Intermolecular Hydroamination of Terminal Allenes
作者:Michael L. Cooke、Kun Xu、Bernhard Breit
DOI:10.1002/anie.201206594
日期:2012.10.22
Branching out: The rhodium‐catalyzed enantioselectivehydroamination of monosubstituted allenes with anilines permits the atom‐economic synthesis of valuable branchedallylicamines. In contrast to previous linear selective allenehydroaminations, a RhI/Josiphos catalyst system (see scheme; cod=1,5‐cyclooctadiene, DCE=1,2‐dichloroethane) allows branchedallylicamines to be obtained with perfect regioselectivity
分支:苯胺对铑取代的单取代烯的对映选择性氢化胺化反应可实现原子经济的有价值的支链烯丙基胺的合成。与以前的线性选择性丙二烯加氢胺化反应相比,Rh I / Josiphos催化剂体系(参见方案; cod = 1,5-环辛二烯,DCE = 1,2-二氯乙烷)可以以理想的区域选择性,高收率获得支链烯丙基胺。和良好的对映选择性。