We present an allylic polyfluoroarylation reaction with broad substrate scope and excellent functional group tolerance, using organozinc reagents under mild conditions. A catalytic amount of triphenylphosphine oxide efficiently promotes iodine-zinc exchange reaction between polyfluoroaryl iodide and dimethylzinc, and the resulting phosphine oxide-activated polyfluoroarylzinc undergoes substitution reaction with allylic halides to afford the corresponding polyfluoroarylated products. (C) 2015 Elsevier Ltd. All rights reserved.
An aerobic oxidative cross-coupling reaction of alkenes with polyfluorobenzenes, through palladium-catalyzed allylic C-H activation, is reported. This attractive route provides a new way to forge allylic C-C bonds of valuable products, in good yields, with high regioselectivity.
Regio- and Stereoselective Allylic C–H Arylation with Electron-Deficient Arenes by 1,1′-Bi-2-naphthol–Palladium Cooperation
作者:Gang-Wei Wang、An-Xi Zhou、Shi-Xia Li、Shang-Dong Yang
DOI:10.1021/ol501247b
日期:2014.6.6
A palladium-catalyzedallylic C–H arylation reaction with electron-deficient arenes with high regio- and stereoselectivity is reported. This work represents the first successful use of 1,1′-bi-2-naphthol as the ancillary ligand in allylic C–H activation, which is the key factor for chemoselectivity. Furthermore, high selectivity allylic C–H acetoxylation and amination were also successfully achieved