Hydrotalcite-supported palladium nanoparticles as catalysts for the hydroarylation of carbon–carbon multiple bonds
作者:A. Di Nicola、A. Arcadi、K. Gallucci、V. Mucciante、L. Rossi
DOI:10.1039/c7nj04046f
日期:——
alkenes with aryl iodides under air in MeCN. The reaction of tertiary propargylic alcohols (1) with aryl iodides (2) yields, stereoselectively, γ,γ-diarylallylic alcohols (3) in moderate to high yields and high selectivity. Also, the HT/Pd hydroarylation reaction with aryl iodides was attempted on norbornene and α,β-unsaturated ketones affording, respectively, exo-aryl bicyclo[2.2.1]heptanes and β-aryl ketones
A nordehydroabietyl amide-containing chiral diene for rhodium-catalysed asymmetric arylation to nitroolefins
作者:Ruikun Li、Zhongqing Wen、Na Wu
DOI:10.1039/c6ob02202b
日期:——
A highlyenantioselectiverhodium catalysed asymmetric arylation (RCAA) of nitroolefins with arylboronicacids is presented using a newly developed, C1-symmetric, non-covalent interacted, phellandrene derived, nordehydroabietyl amide-containing chiral diene under mild conditions. Stereoelectronic effects were studied, suggesting an activation of the bound substrate through the secondary amide as a
9-(Diphenylphosphino)anthracene-based phosphapalladacycle catalyzed conjugate addition of arylboronic acids to electron-deficient alkenes
作者:Minori Shimizu、Tetsuya Yamamoto
DOI:10.1016/j.tetlet.2020.152257
日期:2020.8
9-(Diphenylphosphino)anthracene-based phosphapalladacycle catalyzed conjugateaddition of arylboronic acids to electron-deficient alkenes such asα,β-unsaturated ketones, esters, nitrile and nitroalkenes gave corresponding β-arylated alkanes in good yields and achieved TON up to 700.
Heterogeneous catalytic 1,4-addition of arylmagnesium compounds to chalcones
作者:Kinga Juhász、Zoltán Hell
DOI:10.1016/j.tetlet.2018.07.016
日期:2018.8
Copper(II) on a 4 Å molecular sieve support catalyses the chemoselective addition of alkyl- and arylmagnesiumhalides to chalcones. Only the 1,4-addition products were obtained in high yields.
Copper complexes of phosphoramidites efficiently catalyzed asymmetricaddition of arylboron reagents to acyclic enones. Importantly, rare 1,4-insertion of arylcopper(I) was identified which led directly to O-bound copper enolates. The new mechanism is fundamentally different from classical oxidative addition/reductive elimination of organocopper(I) on enones.
亚磷酰胺的铜配合物有效地催化芳基硼试剂向无环烯酮的不对称加成。重要的是,鉴定了稀有的芳基铜(I)的 1,4-插入,这直接导致了与 O 结合的铜烯醇化物。新机制与传统的有机铜(I)在烯酮上的氧化加成/还原消除有着根本的不同。