A copper-catalyzed cycloamination of α-Csp3–H bond of N-aryl ketimines with sodium azide has been developed. This methodology provides an efficient access to quinoxalines and features mild reaction conditions and readily available ketimines with diverse functional group tolerance.
From Ketones, Amines, and Carbon Monoxide to 4-Quinolones: Palladium-Catalyzed Oxidative Carbonylation
作者:Jiwei Wu、Yuchen Zhou、Ting Wu、Yi Zhou、Chien-Wei Chiang、Aiwen Lei
DOI:10.1021/acs.orglett.7b03337
日期:2017.12.1
A novel method of palladium-catalyzed oxidative carbonylation of ketones, amines, and carbon monoxide for the synthesis of 4-quinolones has been developed. This protocol provides a straightforward route to construct useful 4-quinolone derivatives from inexpensive chemicals.
Iron-Catalyzed Arylation of Heterocycles via Directed C–H Bond Activation
作者:John J. Sirois、Riley Davis、Brenton DeBoef
DOI:10.1021/ol403634b
日期:2014.2.7
The iron-catalyzedarylation of aromatic heterocycles, such as pyridines, thiophenes, and furans, has been achieved. The use of an imine directing group allowed for the ortho functionalization of these heterocycles with complete conversion in 15 min at 0 °C. Yields up to 88% were observed in the synthesis of 15 heterocyclic biaryls.
Superbase-Promoted Addition of Acetylene Gas to the C=N Bond
作者:Elena Yu. Schmidt、Ivan A. Bidusenko、Nadezhda I. Protsuk、Yan V. Demyanov、Igor A. Ushakov、Boris A. Trofimov
DOI:10.1002/ejoc.201900932
日期:2019.9.15
Acetylene gas readily adds to the C=N bond of ketimines in KOtBu/DMSO solution at room temperature to afford terminal propargylamines with a quaternary carbon center in up to 94 % yield. The reaction represents a new Csp3–Csp bond formation under mild transition metal free conditions using available widespread starting materials covering a broad scope of ketimines.