Copper(I)-Catalyzed Substitution Reactions of Propargylic Amines: Importance of C(sp)−C(sp<sup>3</sup>) Bond Cleavage in Generation of Iminium Intermediates
amines proceed in the presence of copper(I) catalysts. Mechanistic studies showed that C(sp)-C(sp(3)) bondcleavage assisted by nitrogen lone-pair electrons is essential for the reaction, and the resulting iminium intermediates undergo amine exchange, aldehyde exchange, and alkyne addition reactions. Because iminium intermediates are key to aldehyde-alkyne-amine (A(3)) coupling reactions, this transformation
New five-coordinate Ru(ii) phosphoramidite complexes and their catalytic activity in propargylic amination reactions
作者:Andria K. Widaman、Nigam P. Rath、Eike B. Bauer
DOI:10.1039/c1nj20520j
日期:——
The first five-coordinate, square-pyramidal ruthenium complexes of the general formula [RuCl2(PPh3)2L] have been prepared, where L is a phosphoramidite ligand. The new complexes were employed as catalysts for the amination reactions of propargylic esters (18 h, at room temperature or 45 °C, Cs2CO3) to give propargylic amines in isolated yields up to 94%.
Copper(I)-Catalyzed Deacetylenative Coupling of Propargylic Amines: An Efficient Synthesis of Symmetric 1,4-Diamino-2-butynes
作者:Yongeun Kim、Hiroyuki Nakamura
DOI:10.1002/chem.201102710
日期:2011.11.4
Deacetylenativecoupling: Propargylicamines undergo copper‐catalyzed deacetylenativecoupling to give the symmetric 1,4‐diamino‐2‐butynes. In the presence of a base, the Glaser‐type homocoupling takes place, whereas in the absence of a base the deacetylenativecoupling takes place (see scheme).