Palladium(II)-Catalyzed Direct Intermolecular Alkenylation of Chromones
作者:Donghee Kim、Sungwoo Hong
DOI:10.1021/ol2018278
日期:2011.8.19
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.
The Domino Chromone Annulation and a Transient Halogenation-Mediated C–H Alkenylation toward 3-Vinyl Chromones
作者:Leiqing Fu、Zhongrong Xu、Jie-Ping Wan、Yunyun Liu
DOI:10.1021/acs.orglett.0c03548
日期:2020.12.18
Reported in this paper is a step economical method toward the general synthesis of 3-vinyl chromones via the reactions between readily available o-hydroxyphenyl enaminones and various alkenes. The domino C–H alkenylation and chromone annulation of the enaminones are involved, which enables the synthesis of 3-vinyl chromone products using both terminal and internal alkenes via a key process of transient C–H