Rhodium‐Catalyzed Chemodivergent Regio‐ and Enantioselective Allylic Alkylation of Indoles
作者:Minghe Sun、Min Liu、Changkun Li
DOI:10.1002/chem.202004613
日期:2021.2.15
C3/N1 chemoselectivity in indole alkylation with the same electrophiles is still challenging. An Rh/bisoxazolinephosphane‐catalyzed chemodivergent regio‐ and enantioselectiveallylicalkylation of indoles was developed. Chiral C3‐ and N1‐allylindoles can be selectively obtained with high branched/linear ratio and up to 99 % ee by changing the counteranion of Rh, the allylic carbonate, the reaction temperature
Rhodium-Catalyzed Enantioselective Hydroamination of Alkynes with Indolines
作者:Qing-An Chen、Zhiwei Chen、Vy M. Dong
DOI:10.1021/jacs.5b05200
日期:2015.7.8
alkynes via tandem rhodium catalysis gives branched N-allylic indolines with high regio- and enantioselectivity. An acid switch provides access to the linear isomer in preference to the branched isomer by an isomerization mechanism. Mechanistic studies suggest formation of an allene intermediate, which undergoes hydroamination to generate allylic amines instead of the enamine or imine products typically observed
Asymmetric<i>N</i>-Allylation of Indoles Through the Iridium-Catalyzed Allylic Alkylation/Oxidation of Indolines
作者:Wen-Bo Liu、Xiao Zhang、Li-Xin Dai、Shu-Li You
DOI:10.1002/anie.201200649
日期:2012.5.21
N‐allylindoles by a one‐pot Ir‐catalyzed asymmetric allylicalkylation/oxidation reaction of indolines has been realized. The current method features high regioselectivity and enantioselectivity together with a broad range of indoles with varying electronic properties. The utility of this method was demonstrated by the synthesis of dihydropyrrolo[1,2‐a]indole derivatives.
有两个步骤可能比一个步骤更好:通过一锅Ir催化的二氢吲哚的不对称烯丙基烷基化/氧化反应,可以有效地合成对映体富集的N-烯丙基。目前的方法具有很高的区域选择性和对映选择性,以及范围广泛的具有不同电子特性的吲哚。通过合成二氢吡咯并[1,2- a ]吲哚衍生物证明了该方法的实用性。