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。
Rh(I)/Bisoxazolinephosphine-Catalyzed Regio- and Enantioselective Allylic Substitutions
作者:Wen-Bin Xu、Samir Ghorai、Wenyu Huang、Changkun Li
DOI:10.1021/acscatal.0c00712
日期:2020.4.17
Rhodium(I)/bisoxazolinephosphine combination has been developed as a general catalyst to achieve the dynamic kinetic asymmetric allylation of a variety of nitrogen, carbon, oxygen, and sulfur pronucleophiles from branched racemic allylic carbonates. Exclusive branch-selectivity and up to 99% enantiomeric excess could be obtained under neutral conditions. Linear allylic substrates (both Z and E) could
Cobalt-Catalyzed Regio- and Enantioselective Allylic Amination
作者:Samir Ghorai、Sahadev Shrihari Chirke、Wen-Bin Xu、Jia-Feng Chen、Changkun Li
DOI:10.1021/jacs.9b06035
日期:2019.7.24
earth-abundant cobalt-catalyzed highly branched- and enantioselectiveallylicamination of racemic branched allylic car-bonates bearing alkyl groups with both aromatic and aliphatic amines have been developed. The process allows rapid access of allylic amines in high yields with exclusively branched selectivity and excellent enantioselectivities (normally 99% ee) under mild reaction conditions.
Rhodium-Catalyzed Asymmetric Amination of Allylic Trichloroacetimidates
作者:Hien Nguyen、Jeffrey Arnold
DOI:10.1055/s-0032-1316921
日期:——
regio- and enantioselectivity. This catalytic method addresses many of the limitations previously associated with syntheses of these compounds. A summary is presented of dynamickineticasymmetrictransformations of racemic allylic trichloroacetimidates in the presence of chiral diene-ligated rhodium catalysts. The reaction is applicable to a wide variety of secondary and tertiary trichloroacetimidates