Palladium-catalyzed oxidative arylation of chromones via a double C–H activation: an expedient approach to flavones
作者:Ko Hoon Kim、Hyun Seung Lee、Se Hee Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2012.03.100
日期:2012.5
A palladium-catalyzed oxidative arylation of chromones was examined. A regioselective 2-arylation of chromone was carried out via a double C–Hactivationprocess. The procedure provided an expedient approach for the preparation of flavone derivatives.
Palladium-Catalyzed Dehydrogenation/Oxidative Cross-Coupling Sequence of β-Heteroatom-Substituted Ketones
作者:Youngtaek Moon、Daeil Kwon、Sungwoo Hong
DOI:10.1002/anie.201206610
日期:2012.11.5
Concise and selective: The title one‐pot sequence allows formation of the enone functionality and subsequent cross‐coupling. The process provides access to highly functionalized cyclic enolones and enaminones from readily accessible β‐heteroatom‐substituted cyclic ketones.
disclose a metal‐free and efficient method for the direct conversion of 2‐propynolphenols to biologically important flavones using aqueous HI as the promoter. This transformation was proved via 4‐iodo‐2H‐chromenes intermediate, which was simultaneously conversed to corresponding flavones by a Csp2–I bond cleavage and a C–O bond formation under air.