Ruthenium-Catalyzed Arylation of 2-Alkenylpyridines with Aryl Bromides: Alternative E,Z-Selectivity to Mizoroki−Heck Reaction
摘要:
[Graphics]Regio- and stereoselective arylation of 2-alkenylpyridines with aryl bromides is catalyzed by specific Ru(II)-phosphine complexes affording beta-arylated (Z)-2-alkenylpyridines, in which the aryl moiety is introduced cis to the pyridyl group. This geometrical selectivity is in sharp contrast to the Mizoroki-Heck reaction.
Aryl-Nickel-Catalyzed Benzylic Dehydrogenation of Electron-Deficient Heteroarenes
作者:Pengpeng Zhang、David Huang、Timothy R. Newhouse
DOI:10.1021/jacs.9b12706
日期:2020.1.29
This manuscript describes the first practical benzylic dehydrogenation of electron-deficient heteroarenes, including pyridines, pyrazines, pyrimidines, pyridazines, and triazines. This transformation allows for the efficient benzylic oxidation of heteroarenes to afford heterocyclic styrenes by the action of nickel catalysis paired with an unconventional bromothiophene oxidant.
Stereospecific synthesis of (E)-alkenylpyridines via α-silyl carbanion
作者:Takeo Konakahara、Yukio Takagi
DOI:10.1016/s0040-4039(00)71490-0
日期:1980.1
(E)-2-Alkenylpyridines were stereospecifically prepared from 2-(trimethylsilylmethyl)pyridine and the corresponding (E)-aldimines of anilines by an analogous reaction to the Peterson reaction.