Palladium(II)-Catalyzed Direct Intermolecular Alkenylation of Chromones
摘要:
A new efficient method for the direct alkenylation of chromones via a palladium(II)-catalyzed C-H functionalization reaction was developed. The use of pivalic acid with Cu(OAc)(3)/Ag2CO3 provided superior reactivity in the cross-coupling of chromones with alkene partners. This approach represents a significant advance over the existing two-step method and afforded various 3-vinylchromone derivatives, which are privileged structures in many biologically active compounds and versatile synthetic building blocks.
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.