Ruthenium-Catalyzed Oxidative Amidation of Alkynes to Amides
作者:Andrea Álvarez-Pérez、Miguel A. Esteruelas、Susana Izquierdo、Jesús A. Varela、Carlos Saá
DOI:10.1021/acs.orglett.9b01993
日期:2019.7.5
Complex CpRuCl(PPh3)2 catalyzes reactions of terminal alkynes with 4-picoline N-oxide and primary and secondary amines to afford the corresponding amides. The reactions occur in chlorinated solvent and aqueous medium, showing applications in peptide chemistry. Stoichiometric studies reveal that the true catalysts of the processes are the vinylidene cations [CpRu(═C═CHR)(PPh3)2]+ which are oxidized
Amide bond synthesis via silver(I) N-heterocyclic carbene-catalyzed and tert-butyl hydroperoxide-mediated oxidative coupling of alcohols with amines under base free conditions
free method for amide bond construction via oxidative coupling of alcohols with amines catalyzed by Silver(I) N-heterocyclic carbenes (Ag(I)-NHCs) and mediated by tert-butyl hydroperoxide (TBHP) in ethanol. The results of controlled experiments suggest that the oxidative coupling proceeds through the formation of aldehyde, then subsequent attack by amine to give hemiaminal, which can then be oxidized
Hamilton; Robinson, Journal of the Chemical Society, 1916, vol. 109, p. 1037
作者:Hamilton、Robinson
DOI:——
日期:——
N-Heterocyclic Carbene Based Ruthenium-Catalyzed Direct Amide Synthesis from Alcohols and Secondary Amines: Involvement of Esters
作者:Cheng Chen、Yao Zhang、Soon Hyeok Hong
DOI:10.1021/jo201756z
日期:2011.12.16
N-heterocyclic carbene based ruthenium complex was developed as a highly active precatalyst for the directamidesynthesisfromalcohols and secondary amines. Notably, reaction of 1-hexanol and dibenzylamine afforded 60% of the corresponding amide using our catalytic system, while no amide formation was observed for this reaction with the previously reported catalytic systems. Unlike the previously reported
Chiral iridium complexes based on spiro phosphoramidite ligands are demonstrated to be highly efficient catalysts for the asymmetrichydrogenation of unfunctionalizedenamines with an exocyclic double bond. In combination with excess iodine or potassium iodide and under hydrogen pressure, the complex Ir/(Sa,R,R)-3a provides chiral N-alkyltetrahydroisoquinolines in high yields with up to 98% ee. The