Copper-catalyzed [2+3]-annulation of N–H imines with vinyl azides: access to polyaryl 2<i>H</i>-imidazoles
作者:Zhongzhi Zhu、Hanze Lin、Baihui Liang、Junjie Huang、Wanyi Liang、Lu Chen、Yubing Huang、Xiuwen Chen、Yibiao Li
DOI:10.1039/c9cc10042c
日期:——
A practical method for the synthesis of 2H-imidazoles via a [2+3] annulation of N-H imines with vinylazides using a copper catalyst is developed. In this conversion, environmentally friendly oxygen is used as the sole oxidant and N2 and H2O are the only by-products. The catalytic transformation, operating under mild conditions, is operationally simple and is considered as a readily available catalytic
Enantioselective Rhodium(I)-Catalyzed [3+2] Annulations of Aromatic Ketimines Induced by Directed CH Activations
作者:Duc N. Tran、Nicolai Cramer
DOI:10.1002/anie.201105766
日期:2011.11.18
selectivity: Highly substituted indenylamines can be obtained with high enantioselectivity by formal [3+2] additions of aryl ketimines with internal alkynes. These rhodium(I)‐catalyzed processes proceed by selective CH activation of one of the two arene substituents, regioselective carbometalation of the alkyne, and enantioselective addition across the imine.
syn-Selective Rhodium(I)-Catalyzed Allylations of Ketimines Proceeding through a Directed CH Activation/Allene Addition Sequence
作者:Duc N. Tran、Nicolai Cramer
DOI:10.1002/anie.201004179
日期:2010.10.25
On a Rh‐oll: Rhodium(I)‐catalyzed CH activations of ketimines and subsequent carborhodation of an allene led to an allyl metal species, which then allylated the imine directing group to give highly functionalized methylene dihydroindenyl amines (see scheme) with excellent regio‐ and diastereoselectivity.
catalytic synthesis of α-tetrasubstituted aminoacidderivatives via in situ generation of N-unsubstituted ketimines is reported. Because of the irreversible formation of N-unsubstituted ketimines, the yields were higher than those generated under the conventional one-pot reaction conditions. This process prevents the need to isolate unstable N-unsubstituted ketimines with alkyl substituents and streamlines
Development of Novel Catalytic Direct Syntheses of N-Unsubstituted Ketimines and Their Applications to One-Pot Reactions
作者:Hiroyuki Morimoto、Takashi Ohshima、Yuta Kondo
DOI:10.1055/a-2131-3448
日期:2024.3
Herein, we summarize our recent efforts toward developing catalytic methods for the synthesis of N-unsubstituted ketimines and their applications to one-pot reactions for producing various nitrogen-containing compounds. This account provides detailed background, optimization, scope, and mechanistic information. We hope this work will stimulate future studies on the implementation of N-unsubstituted