The kinetics of the first part of the reaction between para-substituted benzonitriles and diethylmagnesium have been studied. The rarely isolated intermediate products, the ketimines, have been iso...
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
Asymmetric Synthesis of Vicinal Tetrasubstituted Diamines via Reductive Coupling of Ketimines Templated by Chiral Diborons
作者:Mingkang Zhou、Yaodong Lin、Xiao‐Xuan Chen、Guangqing Xu、Lung Wa Chung、Wenjun Tang
DOI:10.1002/anie.202300334
日期:——
A series of chiral vicinaltetrasubstituted diamines are prepared with high ee values and good to excellent yields via an unprecedented chiral diboron-templated asymmetric homocoupling of aryl alkyl ketimines. The synthetic value of these chiral vicinaltetrasubstituted diamines is demonstrated by the development of efficient organocatalysts for the asymmetric α-bromination of aliphatic aldehydes.
通过前所未有的手性二硼模板化芳基烷基酮亚胺的不对称自偶联,制备了一系列具有高 ee 值和良好至极佳产率的手性邻位四取代二胺。这些手性邻位四取代二胺的合成价值通过开发用于脂肪醛不对称α-溴化的高效有机催化剂得到证明。
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