An Expedient Three-Component Approach to the Synthesis of α,α-Disubstituted Amines under Barbier-like Conditions
作者:Erwan Le Gall、Stéphane Sengmany、Michel Troupel
DOI:10.1055/s-2008-1072582
日期:——
A series of α,α-disubstituted amines such as diarylmethylamines, 1,2-diarylethylamines, and amino esters have been prepared in acetonitrile using a simple and expedient three-component Mannich-type procedure involving organic halides, aldehyde derivatives, and amines. Reactions are conducted under Barbier-like conditions using simple organic halides and zinc dust for the in situ generation of organozinc reagents.
Three-Component Synthesis of α-Branched Amines under Barbier-like Conditions
作者:Erwan Le Gall、Caroline Haurena、Stéphane Sengmany、Thierry Martens、Michel Troupel
DOI:10.1021/jo901704s
日期:2009.10.16
An array of alpha-branched amines has been prepared by using an expedient three-component Mannich-type reaction among organic halides, aldehyde derivatives, and amines. The experimental procedure, which is characterized by its simplicity, employs zinc dust for the in situ generation of organozinc reagents. We show that this Barbier-like protocol constitutes a useful entry to diaryl-methylamines, 1,2-diarylethylamines, alpha- or beta-amino esters, benzylamines, and beta-arylethylamines.
Highly Efficient and Diastereoselective Gold(I)-Catalyzed Synthesis of Tertiary Amines from Secondary Amines and Alkynes: Substrate Scope and Mechanistic Insights
作者:Xin-Yuan Liu、Zhen Guo、Sijia S. Dong、Xiao-Hua Li、Chi-Ming Che
DOI:10.1002/chem.201101982
日期:2011.11.11
without the need of isolation of air/moisture‐sensitive enamine intermediates, and under mild reaction conditions (mostly roomtemperature and mild reducing agents). Mechanistic studies by NMR spectroscopy, ESI‐MS, isotope labeling studies, and DFT calculations on this gold(I)‐catalyzed tandem reaction reveal that the first step involving a monomeric cationic gold(I)–alkyne intermediate is more likely than