Synthesis of<i>N</i>,<i>N</i>-Disubstituted 3-Amino-1,4-diynes and 3-Amino-1-ynes by Addition of Alkynyldimethylaluminum Reagents to<i>N</i>,<i>N</i>-Disubstituted Formamides and N,O-Acetals
作者:Balaji L. Korbad、Sang-Hyeup Lee
DOI:10.1002/ejoc.201402464
日期:2014.8
A range of alkynyldimethylaluminum reagents were added to N,N‐disubstituted formamides and the their acetals to provide the corresponding N,N‐disubstituted 3‐amino‐1,4‐diynes. Also, these reagents smoothly underwent the addition to N,O‐acetals to give the corresponding N,N‐disubstituted 3‐amino‐1‐ynes.
Addition reaction of zinc acetylides to thioiminium salts leading to 3-amino-1-sulfenyl-1,4-enynes
作者:Toshiaki Murai、Yukiyasu Ohta、Yuichiro Mutoh
DOI:10.1016/j.tetlet.2005.03.166
日期:2005.5
The reaction of thioiminium salts with zinc acetylides took place at 60 °C to give 3-amino-1-sulfenyl-1,4-enynes in moderate to good yields. Two molecules of acetylides were incorporated into the products. Nucleophilic attack of zinc acetylides to thioiminium salts may initially occur to form alkynyl S,N-acetals, followed by their [1,3]-rearrangement to give 3-sulfenyl-1-aminoallenes.
The synthesis of 3-amino-1,4-diynes has been developed by the two-component coupling of N,N-dimethyl formamide dimethyl acetal with terminal alkynes using CuO nanoparticles as an efficient catalyst under mild reaction conditions in ambient air. The procedure is applicable to aryl, alkyl, alkenyl, and heteroaryl alkynes. The CuO nanoparticles are easily recyclable without the loss of significant catalytic
Copper-Catalyzed Coupling Reaction of C−OMe Bonds Adjacent to a Nitrogen Atom with Terminal Alkynes
作者:Bangben Yao、Yuhong Zhang、Yong Li
DOI:10.1021/jo1007898
日期:2010.7.2
The cross coupling of the C-OMe bond adjacent to a nitrogen atom in dialkoxy-N,N-dialkylmethanamines with terminal alkynes was efficiently approached in the presence of copper catalyst under mild conditions to give 3-amino-1,4-diynes in good yields. The reaction is promoted by phosphine ligands and the chemistry provides a simple and efficient route to 3-amino-1,4-diynes. Importantly, the Michael addition occurred with as-prepared 3-amino-1,4-diynes to give the useful Michael-adducts containing tert-alkylamines in a very convenient way. Further studies revealed that (E)-1,5-diarylpent-1-en-4-yn-3-one was formed through the rearrangement by using the neutral alumina column, and the corresponding imine 2-(1,5-diphenylpent-2-en-4-ynylideneamino)ethanol was obtained in the presence of AgOTf.