Rh(III)-catalyzed oxidative amidation of aldehydes: An efficient route to N-pyridinamides and imides

n-Bu4NI/K2S2O8-MEDIATED C-N COUPLING BETWEEN ALDEHYDES AND AMIDES

n-Bu4NI/K2S2O8 mediated C-N coupling between aldehydes and amides is reported. A strong electronic effect is observed on the aromatic aldehyde substrates. The transformylation from aldehyde to amide takes place exclusively when an aromatic aldehyde bears electron-donating groups at either the ortho or para position of the formyl group, while the cross-dehydrogenative coupling dominates in the absence of these groups. Both the density functional theory (DFT) thermochemistry calculations and experimental data support the proposed single electron transfer mechanism with the formation of an acyl radical intermediate in the cross-dehydrogenative coupling. The n-Bu4NI/K2S2O8 mediated oxidative cyclization between 2-aminobenzamide and aldehydes is also reported, with four quinazolin-4(3H)-ones prepared in 65-99% yields.

CuI incorporated cobalt ferrite nanoparticles as a magnetically separable catalyst for oxidative amidation reaction

A Cu-incorporated magnetic nanocatalyst has been developed for oxidative amidation of aryl aldehydes with 2-aminopyridine in the presence of TBHP.

Direct oxidative amidation of aldehydes with amines catalyzed by heteropolyanion-based ionic liquids under solvent-free conditions via a dual-catalysis process

A heteropolyanion-based ionic liquid catalyzed oxidative amidation of aldehydes with amines via a dual-catalysis pathway has been reported.

Microwave-assisted heteropolyanion-based ionic liquid promoted sustainable protocol to N-heteroaryl amides via N-directing dual catalyzed oxidative amidation of aldehydes

A procedure for the synthesis of N-heteroaryl amides directly from oxidative amidation of aldehydes catalyzed by heteropolyanion-based ionic liquids has been reported. The proposed N-directing dual-catalysis mechanism was briefly investigated.

Copper-catalyzed efficient direct amidation of 2-methylquinolines with amines

A novel Cu-catalyzed direct amidation of 2-methylquinolines with amines is described. This method afforded an efficient approach for the synthesis of biologically important aromatic amides from readily available coupling partners using molecular oxygen as the oxidant.

N-heterocyclic carbene-based ruthenium-catalyzed direct amidation of aldehydes with amines

Ru-catalyzed dehydrogenative amide synthesis from aldehydes and amines was achieved, based on the idea of using a hemiaminal intermediate to generate the active Ru-hydride species.