Copper-Catalyzed Coupling Reaction of C−OMe Bonds Adjacent to a Nitrogen Atom with Terminal Alkynes
摘要:
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.
Copper-Catalyzed A3-Coupling: Synthesis of 3-Amino-1,4-diynes
作者:Yoon-Jeong Choi、Hye-Young Jang
DOI:10.1002/ejoc.201600343
日期:2016.6
the synthesis of 3-amino-1,4-diynes. Although metal-catalyzed A3-coupling reactions have been extensively used to synthesize various propargylamines, the A3-coupling for the synthesis of 3-amino-1,4-diynes has been rarely reported. In this study, various symmetrical 3-amino-1,4-diynes were synthesized by the sequential Cu-catalyzed dealkynylation of propargyl aldehydes followed by A3-coupling. Unsymmetrical