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
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。
Synthesis of Allylarenes<i>via</i>Catalytic Decarboxylation of Allyl Benzoates
作者:Kai F. Pfister、Matthias F. Grünberg、Lukas J. Gooßen
DOI:10.1002/adsc.201400624
日期:2014.11.3
AbstractA catalyst system consisting of the palladium(0) complex Pd2(dba)3 and tri(p‐tolyl)phosphine was found to efficiently promote the decarboxylation of allyl benzoates with formation of allylarenes. This catalytic CO activation followed by extrusion of carbon dioxide and CC bond formation represents a sustainable alternative to traditional waste‐intensive cross‐couplings. The scope of the transformation includes allyl and cinnamyl esters of various ortho‐substituted benzoic acids. For particularly activated substrates, the palladium catalyst can optionally be replaced by an inexpensive nickel complex.magnified image