Palladium-Catalyzed Direct C–H Allylation of Electron-Deficient Polyfluoroarenes with Alkynes
作者:Jun Zheng、Bernhard Breit
DOI:10.1021/acs.orglett.8b00393
日期:2018.4.6
A palladium-catalyzed intermolecular direct C–H allylation of polyfluoroarenes with alkynes is reported. Unlike classic hydroarylation reactions, alkynes are used as allylic electrophile surrogates in this direct aromatic C–H allylation. As an atom-economic and efficient method, various linear allylated fluoroarenes were synthesized from two simple and easy-to-access feedstocks in good to excellent
Direct Palladium-Catalyzed Intermolecular Allylation of Highly Electron-Deficient Polyfluoroarenes
作者:Shilu Fan、Fei Chen、Xingang Zhang
DOI:10.1002/anie.201008174
日期:2011.6.20
A simple operation: The use of readily available PPh3, high reaction efficiency, and good stereo‐ and regioselectivity provided useful and operationally simple access to polyfluoroarylated derivatives through the title transformation (see scheme; phen=1,10‐phenanthroline). The reaction mechanism was also studied.
Rapid and concise: The title reaction proceeds via copper complexes in a highly stereospecific manner (see scheme; acac=acetylacetonate, phen=1,10‐phenanthroline, TBS=tBuMe2Si). The catalysis provides a rapid and concise route to allylarenes that contain fluorinated aromatic cores of an electron‐deficient nature.
快速简明:标题反应以高度立体定向的方式通过铜络合物进行(参见方案; acac =乙酰丙酮酸酯,phen = 1,10-菲咯啉,TBS = t BuMe 2 Si)。催化作用提供了一条快速而简明的途径,以得到含有电子不足性质的氟化芳族核的烯丙基芳烃。
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
Ruthenium-Catalyzed Heck-Type Alkenylation of Alkyl Bromides
作者:José María Muñoz-Molina、Pedro J. Pérez
DOI:10.1021/acs.joc.9b00898
日期:2019.6.21
Heck-type alkenylation of alkylbromides in the first example using this metal under thermal conditions. The coupling reaction proceeds efficiently with a variety of functionalized tertiary, secondary, and primary alkylbromides. The presence of Hünig’s base has been revealed to be crucial for this transformation. Preliminary mechanistic studies support the participation of alkyl radicals in the reaction